1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Samsung MIPI DSIM bridge driver. 4 * 5 * Copyright (C) 2021 Amarula Solutions(India) 6 * Copyright (c) 2014 Samsung Electronics Co., Ltd 7 * Author: Jagan Teki <jagan@amarulasolutions.com> 8 * 9 * Based on exynos_drm_dsi from 10 * Tomasz Figa <t.figa@samsung.com> 11 */ 12 13 #include <asm/unaligned.h> 14 15 #include <linux/clk.h> 16 #include <linux/delay.h> 17 #include <linux/irq.h> 18 #include <linux/media-bus-format.h> 19 #include <linux/of.h> 20 #include <linux/phy/phy.h> 21 #include <linux/platform_device.h> 22 23 #include <video/mipi_display.h> 24 25 #include <drm/bridge/samsung-dsim.h> 26 #include <drm/drm_panel.h> 27 #include <drm/drm_print.h> 28 29 /* returns true iff both arguments logically differs */ 30 #define NEQV(a, b) (!(a) ^ !(b)) 31 32 /* DSIM_STATUS */ 33 #define DSIM_STOP_STATE_DAT(x) (((x) & 0xf) << 0) 34 #define DSIM_STOP_STATE_CLK BIT(8) 35 #define DSIM_TX_READY_HS_CLK BIT(10) 36 #define DSIM_PLL_STABLE BIT(31) 37 38 /* DSIM_SWRST */ 39 #define DSIM_FUNCRST BIT(16) 40 #define DSIM_SWRST BIT(0) 41 42 /* DSIM_TIMEOUT */ 43 #define DSIM_LPDR_TIMEOUT(x) ((x) << 0) 44 #define DSIM_BTA_TIMEOUT(x) ((x) << 16) 45 46 /* DSIM_CLKCTRL */ 47 #define DSIM_ESC_PRESCALER(x) (((x) & 0xffff) << 0) 48 #define DSIM_ESC_PRESCALER_MASK (0xffff << 0) 49 #define DSIM_LANE_ESC_CLK_EN_CLK BIT(19) 50 #define DSIM_LANE_ESC_CLK_EN_DATA(x) (((x) & 0xf) << 20) 51 #define DSIM_LANE_ESC_CLK_EN_DATA_MASK (0xf << 20) 52 #define DSIM_BYTE_CLKEN BIT(24) 53 #define DSIM_BYTE_CLK_SRC(x) (((x) & 0x3) << 25) 54 #define DSIM_BYTE_CLK_SRC_MASK (0x3 << 25) 55 #define DSIM_PLL_BYPASS BIT(27) 56 #define DSIM_ESC_CLKEN BIT(28) 57 #define DSIM_TX_REQUEST_HSCLK BIT(31) 58 59 /* DSIM_CONFIG */ 60 #define DSIM_LANE_EN_CLK BIT(0) 61 #define DSIM_LANE_EN(x) (((x) & 0xf) << 1) 62 #define DSIM_NUM_OF_DATA_LANE(x) (((x) & 0x3) << 5) 63 #define DSIM_SUB_PIX_FORMAT(x) (((x) & 0x7) << 8) 64 #define DSIM_MAIN_PIX_FORMAT_MASK (0x7 << 12) 65 #define DSIM_MAIN_PIX_FORMAT_RGB888 (0x7 << 12) 66 #define DSIM_MAIN_PIX_FORMAT_RGB666 (0x6 << 12) 67 #define DSIM_MAIN_PIX_FORMAT_RGB666_P (0x5 << 12) 68 #define DSIM_MAIN_PIX_FORMAT_RGB565 (0x4 << 12) 69 #define DSIM_SUB_VC (((x) & 0x3) << 16) 70 #define DSIM_MAIN_VC (((x) & 0x3) << 18) 71 #define DSIM_HSA_DISABLE_MODE BIT(20) 72 #define DSIM_HBP_DISABLE_MODE BIT(21) 73 #define DSIM_HFP_DISABLE_MODE BIT(22) 74 /* 75 * The i.MX 8M Mini Applications Processor Reference Manual, 76 * Rev. 3, 11/2020 Page 4091 77 * The i.MX 8M Nano Applications Processor Reference Manual, 78 * Rev. 2, 07/2022 Page 3058 79 * The i.MX 8M Plus Applications Processor Reference Manual, 80 * Rev. 1, 06/2021 Page 5436 81 * all claims this bit is 'HseDisableMode' with the definition 82 * 0 = Disables transfer 83 * 1 = Enables transfer 84 * 85 * This clearly states that HSE is not a disabled bit. 86 * 87 * The naming convention follows as per the manual and the 88 * driver logic is based on the MIPI_DSI_MODE_VIDEO_HSE flag. 89 */ 90 #define DSIM_HSE_DISABLE_MODE BIT(23) 91 #define DSIM_AUTO_MODE BIT(24) 92 #define DSIM_VIDEO_MODE BIT(25) 93 #define DSIM_BURST_MODE BIT(26) 94 #define DSIM_SYNC_INFORM BIT(27) 95 #define DSIM_EOT_DISABLE BIT(28) 96 #define DSIM_MFLUSH_VS BIT(29) 97 /* This flag is valid only for exynos3250/3472/5260/5430 */ 98 #define DSIM_CLKLANE_STOP BIT(30) 99 100 /* DSIM_ESCMODE */ 101 #define DSIM_TX_TRIGGER_RST BIT(4) 102 #define DSIM_TX_LPDT_LP BIT(6) 103 #define DSIM_CMD_LPDT_LP BIT(7) 104 #define DSIM_FORCE_BTA BIT(16) 105 #define DSIM_FORCE_STOP_STATE BIT(20) 106 #define DSIM_STOP_STATE_CNT(x) (((x) & 0x7ff) << 21) 107 #define DSIM_STOP_STATE_CNT_MASK (0x7ff << 21) 108 109 /* DSIM_MDRESOL */ 110 #define DSIM_MAIN_STAND_BY BIT(31) 111 #define DSIM_MAIN_VRESOL(x, num_bits) (((x) & ((1 << (num_bits)) - 1)) << 16) 112 #define DSIM_MAIN_HRESOL(x, num_bits) (((x) & ((1 << (num_bits)) - 1)) << 0) 113 114 /* DSIM_MVPORCH */ 115 #define DSIM_CMD_ALLOW(x) ((x) << 28) 116 #define DSIM_STABLE_VFP(x) ((x) << 16) 117 #define DSIM_MAIN_VBP(x) ((x) << 0) 118 #define DSIM_CMD_ALLOW_MASK (0xf << 28) 119 #define DSIM_STABLE_VFP_MASK (0x7ff << 16) 120 #define DSIM_MAIN_VBP_MASK (0x7ff << 0) 121 122 /* DSIM_MHPORCH */ 123 #define DSIM_MAIN_HFP(x) ((x) << 16) 124 #define DSIM_MAIN_HBP(x) ((x) << 0) 125 #define DSIM_MAIN_HFP_MASK ((0xffff) << 16) 126 #define DSIM_MAIN_HBP_MASK ((0xffff) << 0) 127 128 /* DSIM_MSYNC */ 129 #define DSIM_MAIN_VSA(x) ((x) << 22) 130 #define DSIM_MAIN_HSA(x) ((x) << 0) 131 #define DSIM_MAIN_VSA_MASK ((0x3ff) << 22) 132 #define DSIM_MAIN_HSA_MASK ((0xffff) << 0) 133 134 /* DSIM_SDRESOL */ 135 #define DSIM_SUB_STANDY(x) ((x) << 31) 136 #define DSIM_SUB_VRESOL(x) ((x) << 16) 137 #define DSIM_SUB_HRESOL(x) ((x) << 0) 138 #define DSIM_SUB_STANDY_MASK ((0x1) << 31) 139 #define DSIM_SUB_VRESOL_MASK ((0x7ff) << 16) 140 #define DSIM_SUB_HRESOL_MASK ((0x7ff) << 0) 141 142 /* DSIM_INTSRC */ 143 #define DSIM_INT_PLL_STABLE BIT(31) 144 #define DSIM_INT_SW_RST_RELEASE BIT(30) 145 #define DSIM_INT_SFR_FIFO_EMPTY BIT(29) 146 #define DSIM_INT_SFR_HDR_FIFO_EMPTY BIT(28) 147 #define DSIM_INT_BTA BIT(25) 148 #define DSIM_INT_FRAME_DONE BIT(24) 149 #define DSIM_INT_RX_TIMEOUT BIT(21) 150 #define DSIM_INT_BTA_TIMEOUT BIT(20) 151 #define DSIM_INT_RX_DONE BIT(18) 152 #define DSIM_INT_RX_TE BIT(17) 153 #define DSIM_INT_RX_ACK BIT(16) 154 #define DSIM_INT_RX_ECC_ERR BIT(15) 155 #define DSIM_INT_RX_CRC_ERR BIT(14) 156 157 /* DSIM_FIFOCTRL */ 158 #define DSIM_RX_DATA_FULL BIT(25) 159 #define DSIM_RX_DATA_EMPTY BIT(24) 160 #define DSIM_SFR_HEADER_FULL BIT(23) 161 #define DSIM_SFR_HEADER_EMPTY BIT(22) 162 #define DSIM_SFR_PAYLOAD_FULL BIT(21) 163 #define DSIM_SFR_PAYLOAD_EMPTY BIT(20) 164 #define DSIM_I80_HEADER_FULL BIT(19) 165 #define DSIM_I80_HEADER_EMPTY BIT(18) 166 #define DSIM_I80_PAYLOAD_FULL BIT(17) 167 #define DSIM_I80_PAYLOAD_EMPTY BIT(16) 168 #define DSIM_SD_HEADER_FULL BIT(15) 169 #define DSIM_SD_HEADER_EMPTY BIT(14) 170 #define DSIM_SD_PAYLOAD_FULL BIT(13) 171 #define DSIM_SD_PAYLOAD_EMPTY BIT(12) 172 #define DSIM_MD_HEADER_FULL BIT(11) 173 #define DSIM_MD_HEADER_EMPTY BIT(10) 174 #define DSIM_MD_PAYLOAD_FULL BIT(9) 175 #define DSIM_MD_PAYLOAD_EMPTY BIT(8) 176 #define DSIM_RX_FIFO BIT(4) 177 #define DSIM_SFR_FIFO BIT(3) 178 #define DSIM_I80_FIFO BIT(2) 179 #define DSIM_SD_FIFO BIT(1) 180 #define DSIM_MD_FIFO BIT(0) 181 182 /* DSIM_PHYACCHR */ 183 #define DSIM_AFC_EN BIT(14) 184 #define DSIM_AFC_CTL(x) (((x) & 0x7) << 5) 185 186 /* DSIM_PLLCTRL */ 187 #define DSIM_PLL_DPDNSWAP_CLK (1 << 25) 188 #define DSIM_PLL_DPDNSWAP_DAT (1 << 24) 189 #define DSIM_FREQ_BAND(x) ((x) << 24) 190 #define DSIM_PLL_EN BIT(23) 191 #define DSIM_PLL_P(x, offset) ((x) << (offset)) 192 #define DSIM_PLL_M(x) ((x) << 4) 193 #define DSIM_PLL_S(x) ((x) << 1) 194 195 /* DSIM_PHYCTRL */ 196 #define DSIM_PHYCTRL_ULPS_EXIT(x) (((x) & 0x1ff) << 0) 197 #define DSIM_PHYCTRL_B_DPHYCTL_VREG_LP BIT(30) 198 #define DSIM_PHYCTRL_B_DPHYCTL_SLEW_UP BIT(14) 199 200 /* DSIM_PHYTIMING */ 201 #define DSIM_PHYTIMING_LPX(x) ((x) << 8) 202 #define DSIM_PHYTIMING_HS_EXIT(x) ((x) << 0) 203 204 /* DSIM_PHYTIMING1 */ 205 #define DSIM_PHYTIMING1_CLK_PREPARE(x) ((x) << 24) 206 #define DSIM_PHYTIMING1_CLK_ZERO(x) ((x) << 16) 207 #define DSIM_PHYTIMING1_CLK_POST(x) ((x) << 8) 208 #define DSIM_PHYTIMING1_CLK_TRAIL(x) ((x) << 0) 209 210 /* DSIM_PHYTIMING2 */ 211 #define DSIM_PHYTIMING2_HS_PREPARE(x) ((x) << 16) 212 #define DSIM_PHYTIMING2_HS_ZERO(x) ((x) << 8) 213 #define DSIM_PHYTIMING2_HS_TRAIL(x) ((x) << 0) 214 215 #define DSI_MAX_BUS_WIDTH 4 216 #define DSI_NUM_VIRTUAL_CHANNELS 4 217 #define DSI_TX_FIFO_SIZE 2048 218 #define DSI_RX_FIFO_SIZE 256 219 #define DSI_XFER_TIMEOUT_MS 100 220 #define DSI_RX_FIFO_EMPTY 0x30800002 221 222 #define OLD_SCLK_MIPI_CLK_NAME "pll_clk" 223 224 #define PS_TO_CYCLE(ps, hz) DIV64_U64_ROUND_CLOSEST(((ps) * (hz)), 1000000000000ULL) 225 226 static const char *const clk_names[5] = { 227 "bus_clk", 228 "sclk_mipi", 229 "phyclk_mipidphy0_bitclkdiv8", 230 "phyclk_mipidphy0_rxclkesc0", 231 "sclk_rgb_vclk_to_dsim0" 232 }; 233 234 enum samsung_dsim_transfer_type { 235 EXYNOS_DSI_TX, 236 EXYNOS_DSI_RX, 237 }; 238 239 enum reg_idx { 240 DSIM_STATUS_REG, /* Status register */ 241 DSIM_SWRST_REG, /* Software reset register */ 242 DSIM_CLKCTRL_REG, /* Clock control register */ 243 DSIM_TIMEOUT_REG, /* Time out register */ 244 DSIM_CONFIG_REG, /* Configuration register */ 245 DSIM_ESCMODE_REG, /* Escape mode register */ 246 DSIM_MDRESOL_REG, 247 DSIM_MVPORCH_REG, /* Main display Vporch register */ 248 DSIM_MHPORCH_REG, /* Main display Hporch register */ 249 DSIM_MSYNC_REG, /* Main display sync area register */ 250 DSIM_INTSRC_REG, /* Interrupt source register */ 251 DSIM_INTMSK_REG, /* Interrupt mask register */ 252 DSIM_PKTHDR_REG, /* Packet Header FIFO register */ 253 DSIM_PAYLOAD_REG, /* Payload FIFO register */ 254 DSIM_RXFIFO_REG, /* Read FIFO register */ 255 DSIM_FIFOCTRL_REG, /* FIFO status and control register */ 256 DSIM_PLLCTRL_REG, /* PLL control register */ 257 DSIM_PHYCTRL_REG, 258 DSIM_PHYTIMING_REG, 259 DSIM_PHYTIMING1_REG, 260 DSIM_PHYTIMING2_REG, 261 NUM_REGS 262 }; 263 264 static const unsigned int exynos_reg_ofs[] = { 265 [DSIM_STATUS_REG] = 0x00, 266 [DSIM_SWRST_REG] = 0x04, 267 [DSIM_CLKCTRL_REG] = 0x08, 268 [DSIM_TIMEOUT_REG] = 0x0c, 269 [DSIM_CONFIG_REG] = 0x10, 270 [DSIM_ESCMODE_REG] = 0x14, 271 [DSIM_MDRESOL_REG] = 0x18, 272 [DSIM_MVPORCH_REG] = 0x1c, 273 [DSIM_MHPORCH_REG] = 0x20, 274 [DSIM_MSYNC_REG] = 0x24, 275 [DSIM_INTSRC_REG] = 0x2c, 276 [DSIM_INTMSK_REG] = 0x30, 277 [DSIM_PKTHDR_REG] = 0x34, 278 [DSIM_PAYLOAD_REG] = 0x38, 279 [DSIM_RXFIFO_REG] = 0x3c, 280 [DSIM_FIFOCTRL_REG] = 0x44, 281 [DSIM_PLLCTRL_REG] = 0x4c, 282 [DSIM_PHYCTRL_REG] = 0x5c, 283 [DSIM_PHYTIMING_REG] = 0x64, 284 [DSIM_PHYTIMING1_REG] = 0x68, 285 [DSIM_PHYTIMING2_REG] = 0x6c, 286 }; 287 288 static const unsigned int exynos5433_reg_ofs[] = { 289 [DSIM_STATUS_REG] = 0x04, 290 [DSIM_SWRST_REG] = 0x0C, 291 [DSIM_CLKCTRL_REG] = 0x10, 292 [DSIM_TIMEOUT_REG] = 0x14, 293 [DSIM_CONFIG_REG] = 0x18, 294 [DSIM_ESCMODE_REG] = 0x1C, 295 [DSIM_MDRESOL_REG] = 0x20, 296 [DSIM_MVPORCH_REG] = 0x24, 297 [DSIM_MHPORCH_REG] = 0x28, 298 [DSIM_MSYNC_REG] = 0x2C, 299 [DSIM_INTSRC_REG] = 0x34, 300 [DSIM_INTMSK_REG] = 0x38, 301 [DSIM_PKTHDR_REG] = 0x3C, 302 [DSIM_PAYLOAD_REG] = 0x40, 303 [DSIM_RXFIFO_REG] = 0x44, 304 [DSIM_FIFOCTRL_REG] = 0x4C, 305 [DSIM_PLLCTRL_REG] = 0x94, 306 [DSIM_PHYCTRL_REG] = 0xA4, 307 [DSIM_PHYTIMING_REG] = 0xB4, 308 [DSIM_PHYTIMING1_REG] = 0xB8, 309 [DSIM_PHYTIMING2_REG] = 0xBC, 310 }; 311 312 enum reg_value_idx { 313 RESET_TYPE, 314 PLL_TIMER, 315 STOP_STATE_CNT, 316 PHYCTRL_ULPS_EXIT, 317 PHYCTRL_VREG_LP, 318 PHYCTRL_SLEW_UP, 319 PHYTIMING_LPX, 320 PHYTIMING_HS_EXIT, 321 PHYTIMING_CLK_PREPARE, 322 PHYTIMING_CLK_ZERO, 323 PHYTIMING_CLK_POST, 324 PHYTIMING_CLK_TRAIL, 325 PHYTIMING_HS_PREPARE, 326 PHYTIMING_HS_ZERO, 327 PHYTIMING_HS_TRAIL 328 }; 329 330 static const unsigned int reg_values[] = { 331 [RESET_TYPE] = DSIM_SWRST, 332 [PLL_TIMER] = 500, 333 [STOP_STATE_CNT] = 0xf, 334 [PHYCTRL_ULPS_EXIT] = DSIM_PHYCTRL_ULPS_EXIT(0x0af), 335 [PHYCTRL_VREG_LP] = 0, 336 [PHYCTRL_SLEW_UP] = 0, 337 [PHYTIMING_LPX] = DSIM_PHYTIMING_LPX(0x06), 338 [PHYTIMING_HS_EXIT] = DSIM_PHYTIMING_HS_EXIT(0x0b), 339 [PHYTIMING_CLK_PREPARE] = DSIM_PHYTIMING1_CLK_PREPARE(0x07), 340 [PHYTIMING_CLK_ZERO] = DSIM_PHYTIMING1_CLK_ZERO(0x27), 341 [PHYTIMING_CLK_POST] = DSIM_PHYTIMING1_CLK_POST(0x0d), 342 [PHYTIMING_CLK_TRAIL] = DSIM_PHYTIMING1_CLK_TRAIL(0x08), 343 [PHYTIMING_HS_PREPARE] = DSIM_PHYTIMING2_HS_PREPARE(0x09), 344 [PHYTIMING_HS_ZERO] = DSIM_PHYTIMING2_HS_ZERO(0x0d), 345 [PHYTIMING_HS_TRAIL] = DSIM_PHYTIMING2_HS_TRAIL(0x0b), 346 }; 347 348 static const unsigned int exynos5422_reg_values[] = { 349 [RESET_TYPE] = DSIM_SWRST, 350 [PLL_TIMER] = 500, 351 [STOP_STATE_CNT] = 0xf, 352 [PHYCTRL_ULPS_EXIT] = DSIM_PHYCTRL_ULPS_EXIT(0xaf), 353 [PHYCTRL_VREG_LP] = 0, 354 [PHYCTRL_SLEW_UP] = 0, 355 [PHYTIMING_LPX] = DSIM_PHYTIMING_LPX(0x08), 356 [PHYTIMING_HS_EXIT] = DSIM_PHYTIMING_HS_EXIT(0x0d), 357 [PHYTIMING_CLK_PREPARE] = DSIM_PHYTIMING1_CLK_PREPARE(0x09), 358 [PHYTIMING_CLK_ZERO] = DSIM_PHYTIMING1_CLK_ZERO(0x30), 359 [PHYTIMING_CLK_POST] = DSIM_PHYTIMING1_CLK_POST(0x0e), 360 [PHYTIMING_CLK_TRAIL] = DSIM_PHYTIMING1_CLK_TRAIL(0x0a), 361 [PHYTIMING_HS_PREPARE] = DSIM_PHYTIMING2_HS_PREPARE(0x0c), 362 [PHYTIMING_HS_ZERO] = DSIM_PHYTIMING2_HS_ZERO(0x11), 363 [PHYTIMING_HS_TRAIL] = DSIM_PHYTIMING2_HS_TRAIL(0x0d), 364 }; 365 366 static const unsigned int exynos5433_reg_values[] = { 367 [RESET_TYPE] = DSIM_FUNCRST, 368 [PLL_TIMER] = 22200, 369 [STOP_STATE_CNT] = 0xa, 370 [PHYCTRL_ULPS_EXIT] = DSIM_PHYCTRL_ULPS_EXIT(0x190), 371 [PHYCTRL_VREG_LP] = DSIM_PHYCTRL_B_DPHYCTL_VREG_LP, 372 [PHYCTRL_SLEW_UP] = DSIM_PHYCTRL_B_DPHYCTL_SLEW_UP, 373 [PHYTIMING_LPX] = DSIM_PHYTIMING_LPX(0x07), 374 [PHYTIMING_HS_EXIT] = DSIM_PHYTIMING_HS_EXIT(0x0c), 375 [PHYTIMING_CLK_PREPARE] = DSIM_PHYTIMING1_CLK_PREPARE(0x09), 376 [PHYTIMING_CLK_ZERO] = DSIM_PHYTIMING1_CLK_ZERO(0x2d), 377 [PHYTIMING_CLK_POST] = DSIM_PHYTIMING1_CLK_POST(0x0e), 378 [PHYTIMING_CLK_TRAIL] = DSIM_PHYTIMING1_CLK_TRAIL(0x09), 379 [PHYTIMING_HS_PREPARE] = DSIM_PHYTIMING2_HS_PREPARE(0x0b), 380 [PHYTIMING_HS_ZERO] = DSIM_PHYTIMING2_HS_ZERO(0x10), 381 [PHYTIMING_HS_TRAIL] = DSIM_PHYTIMING2_HS_TRAIL(0x0c), 382 }; 383 384 static const unsigned int imx8mm_dsim_reg_values[] = { 385 [RESET_TYPE] = DSIM_SWRST, 386 [PLL_TIMER] = 500, 387 [STOP_STATE_CNT] = 0xf, 388 [PHYCTRL_ULPS_EXIT] = DSIM_PHYCTRL_ULPS_EXIT(0xaf), 389 [PHYCTRL_VREG_LP] = 0, 390 [PHYCTRL_SLEW_UP] = 0, 391 [PHYTIMING_LPX] = DSIM_PHYTIMING_LPX(0x06), 392 [PHYTIMING_HS_EXIT] = DSIM_PHYTIMING_HS_EXIT(0x0b), 393 [PHYTIMING_CLK_PREPARE] = DSIM_PHYTIMING1_CLK_PREPARE(0x07), 394 [PHYTIMING_CLK_ZERO] = DSIM_PHYTIMING1_CLK_ZERO(0x26), 395 [PHYTIMING_CLK_POST] = DSIM_PHYTIMING1_CLK_POST(0x0d), 396 [PHYTIMING_CLK_TRAIL] = DSIM_PHYTIMING1_CLK_TRAIL(0x08), 397 [PHYTIMING_HS_PREPARE] = DSIM_PHYTIMING2_HS_PREPARE(0x08), 398 [PHYTIMING_HS_ZERO] = DSIM_PHYTIMING2_HS_ZERO(0x0d), 399 [PHYTIMING_HS_TRAIL] = DSIM_PHYTIMING2_HS_TRAIL(0x0b), 400 }; 401 402 static const struct samsung_dsim_driver_data exynos3_dsi_driver_data = { 403 .reg_ofs = exynos_reg_ofs, 404 .plltmr_reg = 0x50, 405 .has_freqband = 1, 406 .has_clklane_stop = 1, 407 .num_clks = 2, 408 .max_freq = 1000, 409 .wait_for_reset = 1, 410 .num_bits_resol = 11, 411 .pll_p_offset = 13, 412 .reg_values = reg_values, 413 .pll_fin_min = 6, 414 .pll_fin_max = 12, 415 .m_min = 41, 416 .m_max = 125, 417 .min_freq = 500, 418 .has_broken_fifoctrl_emptyhdr = 1, 419 }; 420 421 static const struct samsung_dsim_driver_data exynos4_dsi_driver_data = { 422 .reg_ofs = exynos_reg_ofs, 423 .plltmr_reg = 0x50, 424 .has_freqband = 1, 425 .has_clklane_stop = 1, 426 .num_clks = 2, 427 .max_freq = 1000, 428 .wait_for_reset = 1, 429 .num_bits_resol = 11, 430 .pll_p_offset = 13, 431 .reg_values = reg_values, 432 .pll_fin_min = 6, 433 .pll_fin_max = 12, 434 .m_min = 41, 435 .m_max = 125, 436 .min_freq = 500, 437 .has_broken_fifoctrl_emptyhdr = 1, 438 }; 439 440 static const struct samsung_dsim_driver_data exynos5_dsi_driver_data = { 441 .reg_ofs = exynos_reg_ofs, 442 .plltmr_reg = 0x58, 443 .num_clks = 2, 444 .max_freq = 1000, 445 .wait_for_reset = 1, 446 .num_bits_resol = 11, 447 .pll_p_offset = 13, 448 .reg_values = reg_values, 449 .pll_fin_min = 6, 450 .pll_fin_max = 12, 451 .m_min = 41, 452 .m_max = 125, 453 .min_freq = 500, 454 }; 455 456 static const struct samsung_dsim_driver_data exynos5433_dsi_driver_data = { 457 .reg_ofs = exynos5433_reg_ofs, 458 .plltmr_reg = 0xa0, 459 .has_clklane_stop = 1, 460 .num_clks = 5, 461 .max_freq = 1500, 462 .wait_for_reset = 0, 463 .num_bits_resol = 12, 464 .pll_p_offset = 13, 465 .reg_values = exynos5433_reg_values, 466 .pll_fin_min = 6, 467 .pll_fin_max = 12, 468 .m_min = 41, 469 .m_max = 125, 470 .min_freq = 500, 471 }; 472 473 static const struct samsung_dsim_driver_data exynos5422_dsi_driver_data = { 474 .reg_ofs = exynos5433_reg_ofs, 475 .plltmr_reg = 0xa0, 476 .has_clklane_stop = 1, 477 .num_clks = 2, 478 .max_freq = 1500, 479 .wait_for_reset = 1, 480 .num_bits_resol = 12, 481 .pll_p_offset = 13, 482 .reg_values = exynos5422_reg_values, 483 .pll_fin_min = 6, 484 .pll_fin_max = 12, 485 .m_min = 41, 486 .m_max = 125, 487 .min_freq = 500, 488 }; 489 490 static const struct samsung_dsim_driver_data imx8mm_dsi_driver_data = { 491 .reg_ofs = exynos5433_reg_ofs, 492 .plltmr_reg = 0xa0, 493 .has_clklane_stop = 1, 494 .num_clks = 2, 495 .max_freq = 2100, 496 .wait_for_reset = 0, 497 .num_bits_resol = 12, 498 /* 499 * Unlike Exynos, PLL_P(PMS_P) offset 14 is used in i.MX8M Mini/Nano/Plus 500 * downstream driver - drivers/gpu/drm/bridge/sec-dsim.c 501 */ 502 .pll_p_offset = 14, 503 .reg_values = imx8mm_dsim_reg_values, 504 .pll_fin_min = 2, 505 .pll_fin_max = 30, 506 .m_min = 64, 507 .m_max = 1023, 508 .min_freq = 1050, 509 }; 510 511 static const struct samsung_dsim_driver_data * 512 samsung_dsim_types[DSIM_TYPE_COUNT] = { 513 [DSIM_TYPE_EXYNOS3250] = &exynos3_dsi_driver_data, 514 [DSIM_TYPE_EXYNOS4210] = &exynos4_dsi_driver_data, 515 [DSIM_TYPE_EXYNOS5410] = &exynos5_dsi_driver_data, 516 [DSIM_TYPE_EXYNOS5422] = &exynos5422_dsi_driver_data, 517 [DSIM_TYPE_EXYNOS5433] = &exynos5433_dsi_driver_data, 518 [DSIM_TYPE_IMX8MM] = &imx8mm_dsi_driver_data, 519 [DSIM_TYPE_IMX8MP] = &imx8mm_dsi_driver_data, 520 }; 521 522 static inline struct samsung_dsim *host_to_dsi(struct mipi_dsi_host *h) 523 { 524 return container_of(h, struct samsung_dsim, dsi_host); 525 } 526 527 static inline struct samsung_dsim *bridge_to_dsi(struct drm_bridge *b) 528 { 529 return container_of(b, struct samsung_dsim, bridge); 530 } 531 532 static inline void samsung_dsim_write(struct samsung_dsim *dsi, 533 enum reg_idx idx, u32 val) 534 { 535 writel(val, dsi->reg_base + dsi->driver_data->reg_ofs[idx]); 536 } 537 538 static inline u32 samsung_dsim_read(struct samsung_dsim *dsi, enum reg_idx idx) 539 { 540 return readl(dsi->reg_base + dsi->driver_data->reg_ofs[idx]); 541 } 542 543 static void samsung_dsim_wait_for_reset(struct samsung_dsim *dsi) 544 { 545 if (wait_for_completion_timeout(&dsi->completed, msecs_to_jiffies(300))) 546 return; 547 548 dev_err(dsi->dev, "timeout waiting for reset\n"); 549 } 550 551 static void samsung_dsim_reset(struct samsung_dsim *dsi) 552 { 553 u32 reset_val = dsi->driver_data->reg_values[RESET_TYPE]; 554 555 reinit_completion(&dsi->completed); 556 samsung_dsim_write(dsi, DSIM_SWRST_REG, reset_val); 557 } 558 559 #ifndef MHZ 560 #define MHZ (1000 * 1000) 561 #endif 562 563 static unsigned long samsung_dsim_pll_find_pms(struct samsung_dsim *dsi, 564 unsigned long fin, 565 unsigned long fout, 566 u8 *p, u16 *m, u8 *s) 567 { 568 const struct samsung_dsim_driver_data *driver_data = dsi->driver_data; 569 unsigned long best_freq = 0; 570 u32 min_delta = 0xffffffff; 571 u8 p_min, p_max; 572 u8 _p, best_p; 573 u16 _m, best_m; 574 u8 _s, best_s; 575 576 p_min = DIV_ROUND_UP(fin, (12 * MHZ)); 577 p_max = fin / (6 * MHZ); 578 579 for (_p = p_min; _p <= p_max; ++_p) { 580 for (_s = 0; _s <= 5; ++_s) { 581 u64 tmp; 582 u32 delta; 583 584 tmp = (u64)fout * (_p << _s); 585 do_div(tmp, fin); 586 _m = tmp; 587 if (_m < driver_data->m_min || _m > driver_data->m_max) 588 continue; 589 590 tmp = (u64)_m * fin; 591 do_div(tmp, _p); 592 if (tmp < driver_data->min_freq * MHZ || 593 tmp > driver_data->max_freq * MHZ) 594 continue; 595 596 tmp = (u64)_m * fin; 597 do_div(tmp, _p << _s); 598 599 delta = abs(fout - tmp); 600 if (delta < min_delta) { 601 best_p = _p; 602 best_m = _m; 603 best_s = _s; 604 min_delta = delta; 605 best_freq = tmp; 606 } 607 } 608 } 609 610 if (best_freq) { 611 *p = best_p; 612 *m = best_m; 613 *s = best_s; 614 } 615 616 return best_freq; 617 } 618 619 static unsigned long samsung_dsim_set_pll(struct samsung_dsim *dsi, 620 unsigned long freq) 621 { 622 const struct samsung_dsim_driver_data *driver_data = dsi->driver_data; 623 unsigned long fin, fout; 624 int timeout; 625 u8 p, s; 626 u16 m; 627 u32 reg; 628 629 if (dsi->pll_clk) { 630 /* 631 * Ensure that the reference clock is generated with a power of 632 * two divider from its parent, but close to the PLLs upper 633 * limit. 634 */ 635 fin = clk_get_rate(clk_get_parent(dsi->pll_clk)); 636 while (fin > driver_data->pll_fin_max * MHZ) 637 fin /= 2; 638 clk_set_rate(dsi->pll_clk, fin); 639 640 fin = clk_get_rate(dsi->pll_clk); 641 } else { 642 fin = dsi->pll_clk_rate; 643 } 644 dev_dbg(dsi->dev, "PLL ref clock freq %lu\n", fin); 645 646 fout = samsung_dsim_pll_find_pms(dsi, fin, freq, &p, &m, &s); 647 if (!fout) { 648 dev_err(dsi->dev, 649 "failed to find PLL PMS for requested frequency\n"); 650 return 0; 651 } 652 dev_dbg(dsi->dev, "PLL freq %lu, (p %d, m %d, s %d)\n", fout, p, m, s); 653 654 writel(driver_data->reg_values[PLL_TIMER], 655 dsi->reg_base + driver_data->plltmr_reg); 656 657 reg = DSIM_PLL_EN | DSIM_PLL_P(p, driver_data->pll_p_offset) | 658 DSIM_PLL_M(m) | DSIM_PLL_S(s); 659 660 if (driver_data->has_freqband) { 661 static const unsigned long freq_bands[] = { 662 100 * MHZ, 120 * MHZ, 160 * MHZ, 200 * MHZ, 663 270 * MHZ, 320 * MHZ, 390 * MHZ, 450 * MHZ, 664 510 * MHZ, 560 * MHZ, 640 * MHZ, 690 * MHZ, 665 770 * MHZ, 870 * MHZ, 950 * MHZ, 666 }; 667 int band; 668 669 for (band = 0; band < ARRAY_SIZE(freq_bands); ++band) 670 if (fout < freq_bands[band]) 671 break; 672 673 dev_dbg(dsi->dev, "band %d\n", band); 674 675 reg |= DSIM_FREQ_BAND(band); 676 } 677 678 if (dsi->swap_dn_dp_clk) 679 reg |= DSIM_PLL_DPDNSWAP_CLK; 680 if (dsi->swap_dn_dp_data) 681 reg |= DSIM_PLL_DPDNSWAP_DAT; 682 683 samsung_dsim_write(dsi, DSIM_PLLCTRL_REG, reg); 684 685 timeout = 1000; 686 do { 687 if (timeout-- == 0) { 688 dev_err(dsi->dev, "PLL failed to stabilize\n"); 689 return 0; 690 } 691 reg = samsung_dsim_read(dsi, DSIM_STATUS_REG); 692 } while ((reg & DSIM_PLL_STABLE) == 0); 693 694 dsi->hs_clock = fout; 695 696 return fout; 697 } 698 699 static int samsung_dsim_enable_clock(struct samsung_dsim *dsi) 700 { 701 unsigned long hs_clk, byte_clk, esc_clk, pix_clk; 702 unsigned long esc_div; 703 u32 reg; 704 struct drm_display_mode *m = &dsi->mode; 705 int bpp = mipi_dsi_pixel_format_to_bpp(dsi->format); 706 707 /* m->clock is in KHz */ 708 pix_clk = m->clock * 1000; 709 710 /* Use burst_clk_rate if available, otherwise use the pix_clk */ 711 if (dsi->burst_clk_rate) 712 hs_clk = samsung_dsim_set_pll(dsi, dsi->burst_clk_rate); 713 else 714 hs_clk = samsung_dsim_set_pll(dsi, DIV_ROUND_UP(pix_clk * bpp, dsi->lanes)); 715 716 if (!hs_clk) { 717 dev_err(dsi->dev, "failed to configure DSI PLL\n"); 718 return -EFAULT; 719 } 720 721 byte_clk = hs_clk / 8; 722 esc_div = DIV_ROUND_UP(byte_clk, dsi->esc_clk_rate); 723 esc_clk = byte_clk / esc_div; 724 725 if (esc_clk > 20 * MHZ) { 726 ++esc_div; 727 esc_clk = byte_clk / esc_div; 728 } 729 730 dev_dbg(dsi->dev, "hs_clk = %lu, byte_clk = %lu, esc_clk = %lu\n", 731 hs_clk, byte_clk, esc_clk); 732 733 reg = samsung_dsim_read(dsi, DSIM_CLKCTRL_REG); 734 reg &= ~(DSIM_ESC_PRESCALER_MASK | DSIM_LANE_ESC_CLK_EN_CLK 735 | DSIM_LANE_ESC_CLK_EN_DATA_MASK | DSIM_PLL_BYPASS 736 | DSIM_BYTE_CLK_SRC_MASK); 737 reg |= DSIM_ESC_CLKEN | DSIM_BYTE_CLKEN 738 | DSIM_ESC_PRESCALER(esc_div) 739 | DSIM_LANE_ESC_CLK_EN_CLK 740 | DSIM_LANE_ESC_CLK_EN_DATA(BIT(dsi->lanes) - 1) 741 | DSIM_BYTE_CLK_SRC(0) 742 | DSIM_TX_REQUEST_HSCLK; 743 samsung_dsim_write(dsi, DSIM_CLKCTRL_REG, reg); 744 745 return 0; 746 } 747 748 static void samsung_dsim_set_phy_ctrl(struct samsung_dsim *dsi) 749 { 750 const struct samsung_dsim_driver_data *driver_data = dsi->driver_data; 751 const unsigned int *reg_values = driver_data->reg_values; 752 u32 reg; 753 struct phy_configure_opts_mipi_dphy cfg; 754 int clk_prepare, lpx, clk_zero, clk_post, clk_trail; 755 int hs_exit, hs_prepare, hs_zero, hs_trail; 756 unsigned long long byte_clock = dsi->hs_clock / 8; 757 758 if (driver_data->has_freqband) 759 return; 760 761 phy_mipi_dphy_get_default_config_for_hsclk(dsi->hs_clock, 762 dsi->lanes, &cfg); 763 764 /* 765 * TODO: 766 * The tech Applications Processor manuals for i.MX8M Mini, Nano, 767 * and Plus don't state what the definition of the PHYTIMING 768 * bits are beyond their address and bit position. 769 * After reviewing NXP's downstream code, it appears 770 * that the various PHYTIMING registers take the number 771 * of cycles and use various dividers on them. This 772 * calculation does not result in an exact match to the 773 * downstream code, but it is very close to the values 774 * generated by their lookup table, and it appears 775 * to sync at a variety of resolutions. If someone 776 * can get a more accurate mathematical equation needed 777 * for these registers, this should be updated. 778 */ 779 780 lpx = PS_TO_CYCLE(cfg.lpx, byte_clock); 781 hs_exit = PS_TO_CYCLE(cfg.hs_exit, byte_clock); 782 clk_prepare = PS_TO_CYCLE(cfg.clk_prepare, byte_clock); 783 clk_zero = PS_TO_CYCLE(cfg.clk_zero, byte_clock); 784 clk_post = PS_TO_CYCLE(cfg.clk_post, byte_clock); 785 clk_trail = PS_TO_CYCLE(cfg.clk_trail, byte_clock); 786 hs_prepare = PS_TO_CYCLE(cfg.hs_prepare, byte_clock); 787 hs_zero = PS_TO_CYCLE(cfg.hs_zero, byte_clock); 788 hs_trail = PS_TO_CYCLE(cfg.hs_trail, byte_clock); 789 790 /* B D-PHY: D-PHY Master & Slave Analog Block control */ 791 reg = reg_values[PHYCTRL_ULPS_EXIT] | reg_values[PHYCTRL_VREG_LP] | 792 reg_values[PHYCTRL_SLEW_UP]; 793 794 samsung_dsim_write(dsi, DSIM_PHYCTRL_REG, reg); 795 796 /* 797 * T LPX: Transmitted length of any Low-Power state period 798 * T HS-EXIT: Time that the transmitter drives LP-11 following a HS 799 * burst 800 */ 801 802 reg = DSIM_PHYTIMING_LPX(lpx) | DSIM_PHYTIMING_HS_EXIT(hs_exit); 803 804 samsung_dsim_write(dsi, DSIM_PHYTIMING_REG, reg); 805 806 /* 807 * T CLK-PREPARE: Time that the transmitter drives the Clock Lane LP-00 808 * Line state immediately before the HS-0 Line state starting the 809 * HS transmission 810 * T CLK-ZERO: Time that the transmitter drives the HS-0 state prior to 811 * transmitting the Clock. 812 * T CLK_POST: Time that the transmitter continues to send HS clock 813 * after the last associated Data Lane has transitioned to LP Mode 814 * Interval is defined as the period from the end of T HS-TRAIL to 815 * the beginning of T CLK-TRAIL 816 * T CLK-TRAIL: Time that the transmitter drives the HS-0 state after 817 * the last payload clock bit of a HS transmission burst 818 */ 819 820 reg = DSIM_PHYTIMING1_CLK_PREPARE(clk_prepare) | 821 DSIM_PHYTIMING1_CLK_ZERO(clk_zero) | 822 DSIM_PHYTIMING1_CLK_POST(clk_post) | 823 DSIM_PHYTIMING1_CLK_TRAIL(clk_trail); 824 825 samsung_dsim_write(dsi, DSIM_PHYTIMING1_REG, reg); 826 827 /* 828 * T HS-PREPARE: Time that the transmitter drives the Data Lane LP-00 829 * Line state immediately before the HS-0 Line state starting the 830 * HS transmission 831 * T HS-ZERO: Time that the transmitter drives the HS-0 state prior to 832 * transmitting the Sync sequence. 833 * T HS-TRAIL: Time that the transmitter drives the flipped differential 834 * state after last payload data bit of a HS transmission burst 835 */ 836 837 reg = DSIM_PHYTIMING2_HS_PREPARE(hs_prepare) | 838 DSIM_PHYTIMING2_HS_ZERO(hs_zero) | 839 DSIM_PHYTIMING2_HS_TRAIL(hs_trail); 840 841 samsung_dsim_write(dsi, DSIM_PHYTIMING2_REG, reg); 842 } 843 844 static void samsung_dsim_disable_clock(struct samsung_dsim *dsi) 845 { 846 u32 reg; 847 848 reg = samsung_dsim_read(dsi, DSIM_CLKCTRL_REG); 849 reg &= ~(DSIM_LANE_ESC_CLK_EN_CLK | DSIM_LANE_ESC_CLK_EN_DATA_MASK 850 | DSIM_ESC_CLKEN | DSIM_BYTE_CLKEN); 851 samsung_dsim_write(dsi, DSIM_CLKCTRL_REG, reg); 852 853 reg = samsung_dsim_read(dsi, DSIM_PLLCTRL_REG); 854 reg &= ~DSIM_PLL_EN; 855 samsung_dsim_write(dsi, DSIM_PLLCTRL_REG, reg); 856 } 857 858 static void samsung_dsim_enable_lane(struct samsung_dsim *dsi, u32 lane) 859 { 860 u32 reg = samsung_dsim_read(dsi, DSIM_CONFIG_REG); 861 862 reg |= (DSIM_NUM_OF_DATA_LANE(dsi->lanes - 1) | DSIM_LANE_EN_CLK | 863 DSIM_LANE_EN(lane)); 864 samsung_dsim_write(dsi, DSIM_CONFIG_REG, reg); 865 } 866 867 static int samsung_dsim_init_link(struct samsung_dsim *dsi) 868 { 869 const struct samsung_dsim_driver_data *driver_data = dsi->driver_data; 870 int timeout; 871 u32 reg; 872 u32 lanes_mask; 873 874 /* Initialize FIFO pointers */ 875 reg = samsung_dsim_read(dsi, DSIM_FIFOCTRL_REG); 876 reg &= ~0x1f; 877 samsung_dsim_write(dsi, DSIM_FIFOCTRL_REG, reg); 878 879 usleep_range(9000, 11000); 880 881 reg |= 0x1f; 882 samsung_dsim_write(dsi, DSIM_FIFOCTRL_REG, reg); 883 usleep_range(9000, 11000); 884 885 /* DSI configuration */ 886 reg = 0; 887 888 /* 889 * The first bit of mode_flags specifies display configuration. 890 * If this bit is set[= MIPI_DSI_MODE_VIDEO], dsi will support video 891 * mode, otherwise it will support command mode. 892 */ 893 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) { 894 reg |= DSIM_VIDEO_MODE; 895 896 /* 897 * The user manual describes that following bits are ignored in 898 * command mode. 899 */ 900 if (!(dsi->mode_flags & MIPI_DSI_MODE_VSYNC_FLUSH)) 901 reg |= DSIM_MFLUSH_VS; 902 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) 903 reg |= DSIM_SYNC_INFORM; 904 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) 905 reg |= DSIM_BURST_MODE; 906 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_AUTO_VERT) 907 reg |= DSIM_AUTO_MODE; 908 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_HSE) 909 reg |= DSIM_HSE_DISABLE_MODE; 910 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_NO_HFP) 911 reg |= DSIM_HFP_DISABLE_MODE; 912 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_NO_HBP) 913 reg |= DSIM_HBP_DISABLE_MODE; 914 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_NO_HSA) 915 reg |= DSIM_HSA_DISABLE_MODE; 916 } 917 918 if (dsi->mode_flags & MIPI_DSI_MODE_NO_EOT_PACKET) 919 reg |= DSIM_EOT_DISABLE; 920 921 switch (dsi->format) { 922 case MIPI_DSI_FMT_RGB888: 923 reg |= DSIM_MAIN_PIX_FORMAT_RGB888; 924 break; 925 case MIPI_DSI_FMT_RGB666: 926 reg |= DSIM_MAIN_PIX_FORMAT_RGB666; 927 break; 928 case MIPI_DSI_FMT_RGB666_PACKED: 929 reg |= DSIM_MAIN_PIX_FORMAT_RGB666_P; 930 break; 931 case MIPI_DSI_FMT_RGB565: 932 reg |= DSIM_MAIN_PIX_FORMAT_RGB565; 933 break; 934 default: 935 dev_err(dsi->dev, "invalid pixel format\n"); 936 return -EINVAL; 937 } 938 939 /* 940 * Use non-continuous clock mode if the periparal wants and 941 * host controller supports 942 * 943 * In non-continous clock mode, host controller will turn off 944 * the HS clock between high-speed transmissions to reduce 945 * power consumption. 946 */ 947 if (driver_data->has_clklane_stop && 948 dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) 949 reg |= DSIM_CLKLANE_STOP; 950 samsung_dsim_write(dsi, DSIM_CONFIG_REG, reg); 951 952 lanes_mask = BIT(dsi->lanes) - 1; 953 samsung_dsim_enable_lane(dsi, lanes_mask); 954 955 /* Check clock and data lane state are stop state */ 956 timeout = 100; 957 do { 958 if (timeout-- == 0) { 959 dev_err(dsi->dev, "waiting for bus lanes timed out\n"); 960 return -EFAULT; 961 } 962 963 reg = samsung_dsim_read(dsi, DSIM_STATUS_REG); 964 if ((reg & DSIM_STOP_STATE_DAT(lanes_mask)) 965 != DSIM_STOP_STATE_DAT(lanes_mask)) 966 continue; 967 } while (!(reg & (DSIM_STOP_STATE_CLK | DSIM_TX_READY_HS_CLK))); 968 969 reg = samsung_dsim_read(dsi, DSIM_ESCMODE_REG); 970 reg &= ~DSIM_STOP_STATE_CNT_MASK; 971 reg |= DSIM_STOP_STATE_CNT(driver_data->reg_values[STOP_STATE_CNT]); 972 973 if (!samsung_dsim_hw_is_exynos(dsi->plat_data->hw_type)) 974 reg |= DSIM_FORCE_STOP_STATE; 975 976 samsung_dsim_write(dsi, DSIM_ESCMODE_REG, reg); 977 978 reg = DSIM_BTA_TIMEOUT(0xff) | DSIM_LPDR_TIMEOUT(0xffff); 979 samsung_dsim_write(dsi, DSIM_TIMEOUT_REG, reg); 980 981 return 0; 982 } 983 984 static void samsung_dsim_set_display_mode(struct samsung_dsim *dsi) 985 { 986 struct drm_display_mode *m = &dsi->mode; 987 unsigned int num_bits_resol = dsi->driver_data->num_bits_resol; 988 u32 reg; 989 990 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) { 991 u64 byte_clk = dsi->hs_clock / 8; 992 u64 pix_clk = m->clock * 1000; 993 994 int hfp = DIV64_U64_ROUND_UP((m->hsync_start - m->hdisplay) * byte_clk, pix_clk); 995 int hbp = DIV64_U64_ROUND_UP((m->htotal - m->hsync_end) * byte_clk, pix_clk); 996 int hsa = DIV64_U64_ROUND_UP((m->hsync_end - m->hsync_start) * byte_clk, pix_clk); 997 998 /* remove packet overhead when possible */ 999 hfp = max(hfp - 6, 0); 1000 hbp = max(hbp - 6, 0); 1001 hsa = max(hsa - 6, 0); 1002 1003 dev_dbg(dsi->dev, "calculated hfp: %u, hbp: %u, hsa: %u", 1004 hfp, hbp, hsa); 1005 1006 reg = DSIM_CMD_ALLOW(0xf) 1007 | DSIM_STABLE_VFP(m->vsync_start - m->vdisplay) 1008 | DSIM_MAIN_VBP(m->vtotal - m->vsync_end); 1009 samsung_dsim_write(dsi, DSIM_MVPORCH_REG, reg); 1010 1011 reg = DSIM_MAIN_HFP(hfp) | DSIM_MAIN_HBP(hbp); 1012 samsung_dsim_write(dsi, DSIM_MHPORCH_REG, reg); 1013 1014 reg = DSIM_MAIN_VSA(m->vsync_end - m->vsync_start) 1015 | DSIM_MAIN_HSA(hsa); 1016 samsung_dsim_write(dsi, DSIM_MSYNC_REG, reg); 1017 } 1018 reg = DSIM_MAIN_HRESOL(m->hdisplay, num_bits_resol) | 1019 DSIM_MAIN_VRESOL(m->vdisplay, num_bits_resol); 1020 1021 samsung_dsim_write(dsi, DSIM_MDRESOL_REG, reg); 1022 1023 dev_dbg(dsi->dev, "LCD size = %dx%d\n", m->hdisplay, m->vdisplay); 1024 } 1025 1026 static void samsung_dsim_set_display_enable(struct samsung_dsim *dsi, bool enable) 1027 { 1028 u32 reg; 1029 1030 reg = samsung_dsim_read(dsi, DSIM_MDRESOL_REG); 1031 if (enable) 1032 reg |= DSIM_MAIN_STAND_BY; 1033 else 1034 reg &= ~DSIM_MAIN_STAND_BY; 1035 samsung_dsim_write(dsi, DSIM_MDRESOL_REG, reg); 1036 } 1037 1038 static int samsung_dsim_wait_for_hdr_fifo(struct samsung_dsim *dsi) 1039 { 1040 int timeout = 2000; 1041 1042 do { 1043 u32 reg = samsung_dsim_read(dsi, DSIM_FIFOCTRL_REG); 1044 1045 if (!dsi->driver_data->has_broken_fifoctrl_emptyhdr) { 1046 if (reg & DSIM_SFR_HEADER_EMPTY) 1047 return 0; 1048 } else { 1049 if (!(reg & DSIM_SFR_HEADER_FULL)) { 1050 /* 1051 * Wait a little bit, so the pending data can 1052 * actually leave the FIFO to avoid overflow. 1053 */ 1054 if (!cond_resched()) 1055 usleep_range(950, 1050); 1056 return 0; 1057 } 1058 } 1059 1060 if (!cond_resched()) 1061 usleep_range(950, 1050); 1062 } while (--timeout); 1063 1064 return -ETIMEDOUT; 1065 } 1066 1067 static void samsung_dsim_set_cmd_lpm(struct samsung_dsim *dsi, bool lpm) 1068 { 1069 u32 v = samsung_dsim_read(dsi, DSIM_ESCMODE_REG); 1070 1071 if (lpm) 1072 v |= DSIM_CMD_LPDT_LP; 1073 else 1074 v &= ~DSIM_CMD_LPDT_LP; 1075 1076 samsung_dsim_write(dsi, DSIM_ESCMODE_REG, v); 1077 } 1078 1079 static void samsung_dsim_force_bta(struct samsung_dsim *dsi) 1080 { 1081 u32 v = samsung_dsim_read(dsi, DSIM_ESCMODE_REG); 1082 1083 v |= DSIM_FORCE_BTA; 1084 samsung_dsim_write(dsi, DSIM_ESCMODE_REG, v); 1085 } 1086 1087 static void samsung_dsim_send_to_fifo(struct samsung_dsim *dsi, 1088 struct samsung_dsim_transfer *xfer) 1089 { 1090 struct device *dev = dsi->dev; 1091 struct mipi_dsi_packet *pkt = &xfer->packet; 1092 const u8 *payload = pkt->payload + xfer->tx_done; 1093 u16 length = pkt->payload_length - xfer->tx_done; 1094 bool first = !xfer->tx_done; 1095 u32 reg; 1096 1097 dev_dbg(dev, "< xfer %pK: tx len %u, done %u, rx len %u, done %u\n", 1098 xfer, length, xfer->tx_done, xfer->rx_len, xfer->rx_done); 1099 1100 if (length > DSI_TX_FIFO_SIZE) 1101 length = DSI_TX_FIFO_SIZE; 1102 1103 xfer->tx_done += length; 1104 1105 /* Send payload */ 1106 while (length >= 4) { 1107 reg = get_unaligned_le32(payload); 1108 samsung_dsim_write(dsi, DSIM_PAYLOAD_REG, reg); 1109 payload += 4; 1110 length -= 4; 1111 } 1112 1113 reg = 0; 1114 switch (length) { 1115 case 3: 1116 reg |= payload[2] << 16; 1117 fallthrough; 1118 case 2: 1119 reg |= payload[1] << 8; 1120 fallthrough; 1121 case 1: 1122 reg |= payload[0]; 1123 samsung_dsim_write(dsi, DSIM_PAYLOAD_REG, reg); 1124 break; 1125 } 1126 1127 /* Send packet header */ 1128 if (!first) 1129 return; 1130 1131 reg = get_unaligned_le32(pkt->header); 1132 if (samsung_dsim_wait_for_hdr_fifo(dsi)) { 1133 dev_err(dev, "waiting for header FIFO timed out\n"); 1134 return; 1135 } 1136 1137 if (NEQV(xfer->flags & MIPI_DSI_MSG_USE_LPM, 1138 dsi->state & DSIM_STATE_CMD_LPM)) { 1139 samsung_dsim_set_cmd_lpm(dsi, xfer->flags & MIPI_DSI_MSG_USE_LPM); 1140 dsi->state ^= DSIM_STATE_CMD_LPM; 1141 } 1142 1143 samsung_dsim_write(dsi, DSIM_PKTHDR_REG, reg); 1144 1145 if (xfer->flags & MIPI_DSI_MSG_REQ_ACK) 1146 samsung_dsim_force_bta(dsi); 1147 } 1148 1149 static void samsung_dsim_read_from_fifo(struct samsung_dsim *dsi, 1150 struct samsung_dsim_transfer *xfer) 1151 { 1152 u8 *payload = xfer->rx_payload + xfer->rx_done; 1153 bool first = !xfer->rx_done; 1154 struct device *dev = dsi->dev; 1155 u16 length; 1156 u32 reg; 1157 1158 if (first) { 1159 reg = samsung_dsim_read(dsi, DSIM_RXFIFO_REG); 1160 1161 switch (reg & 0x3f) { 1162 case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_2BYTE: 1163 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE: 1164 if (xfer->rx_len >= 2) { 1165 payload[1] = reg >> 16; 1166 ++xfer->rx_done; 1167 } 1168 fallthrough; 1169 case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_1BYTE: 1170 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE: 1171 payload[0] = reg >> 8; 1172 ++xfer->rx_done; 1173 xfer->rx_len = xfer->rx_done; 1174 xfer->result = 0; 1175 goto clear_fifo; 1176 case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT: 1177 dev_err(dev, "DSI Error Report: 0x%04x\n", (reg >> 8) & 0xffff); 1178 xfer->result = 0; 1179 goto clear_fifo; 1180 } 1181 1182 length = (reg >> 8) & 0xffff; 1183 if (length > xfer->rx_len) { 1184 dev_err(dev, 1185 "response too long (%u > %u bytes), stripping\n", 1186 xfer->rx_len, length); 1187 length = xfer->rx_len; 1188 } else if (length < xfer->rx_len) { 1189 xfer->rx_len = length; 1190 } 1191 } 1192 1193 length = xfer->rx_len - xfer->rx_done; 1194 xfer->rx_done += length; 1195 1196 /* Receive payload */ 1197 while (length >= 4) { 1198 reg = samsung_dsim_read(dsi, DSIM_RXFIFO_REG); 1199 payload[0] = (reg >> 0) & 0xff; 1200 payload[1] = (reg >> 8) & 0xff; 1201 payload[2] = (reg >> 16) & 0xff; 1202 payload[3] = (reg >> 24) & 0xff; 1203 payload += 4; 1204 length -= 4; 1205 } 1206 1207 if (length) { 1208 reg = samsung_dsim_read(dsi, DSIM_RXFIFO_REG); 1209 switch (length) { 1210 case 3: 1211 payload[2] = (reg >> 16) & 0xff; 1212 fallthrough; 1213 case 2: 1214 payload[1] = (reg >> 8) & 0xff; 1215 fallthrough; 1216 case 1: 1217 payload[0] = reg & 0xff; 1218 } 1219 } 1220 1221 if (xfer->rx_done == xfer->rx_len) 1222 xfer->result = 0; 1223 1224 clear_fifo: 1225 length = DSI_RX_FIFO_SIZE / 4; 1226 do { 1227 reg = samsung_dsim_read(dsi, DSIM_RXFIFO_REG); 1228 if (reg == DSI_RX_FIFO_EMPTY) 1229 break; 1230 } while (--length); 1231 } 1232 1233 static void samsung_dsim_transfer_start(struct samsung_dsim *dsi) 1234 { 1235 unsigned long flags; 1236 struct samsung_dsim_transfer *xfer; 1237 bool start = false; 1238 1239 again: 1240 spin_lock_irqsave(&dsi->transfer_lock, flags); 1241 1242 if (list_empty(&dsi->transfer_list)) { 1243 spin_unlock_irqrestore(&dsi->transfer_lock, flags); 1244 return; 1245 } 1246 1247 xfer = list_first_entry(&dsi->transfer_list, 1248 struct samsung_dsim_transfer, list); 1249 1250 spin_unlock_irqrestore(&dsi->transfer_lock, flags); 1251 1252 if (xfer->packet.payload_length && 1253 xfer->tx_done == xfer->packet.payload_length) 1254 /* waiting for RX */ 1255 return; 1256 1257 samsung_dsim_send_to_fifo(dsi, xfer); 1258 1259 if (xfer->packet.payload_length || xfer->rx_len) 1260 return; 1261 1262 xfer->result = 0; 1263 complete(&xfer->completed); 1264 1265 spin_lock_irqsave(&dsi->transfer_lock, flags); 1266 1267 list_del_init(&xfer->list); 1268 start = !list_empty(&dsi->transfer_list); 1269 1270 spin_unlock_irqrestore(&dsi->transfer_lock, flags); 1271 1272 if (start) 1273 goto again; 1274 } 1275 1276 static bool samsung_dsim_transfer_finish(struct samsung_dsim *dsi) 1277 { 1278 struct samsung_dsim_transfer *xfer; 1279 unsigned long flags; 1280 bool start = true; 1281 1282 spin_lock_irqsave(&dsi->transfer_lock, flags); 1283 1284 if (list_empty(&dsi->transfer_list)) { 1285 spin_unlock_irqrestore(&dsi->transfer_lock, flags); 1286 return false; 1287 } 1288 1289 xfer = list_first_entry(&dsi->transfer_list, 1290 struct samsung_dsim_transfer, list); 1291 1292 spin_unlock_irqrestore(&dsi->transfer_lock, flags); 1293 1294 dev_dbg(dsi->dev, 1295 "> xfer %pK, tx_len %zu, tx_done %u, rx_len %u, rx_done %u\n", 1296 xfer, xfer->packet.payload_length, xfer->tx_done, xfer->rx_len, 1297 xfer->rx_done); 1298 1299 if (xfer->tx_done != xfer->packet.payload_length) 1300 return true; 1301 1302 if (xfer->rx_done != xfer->rx_len) 1303 samsung_dsim_read_from_fifo(dsi, xfer); 1304 1305 if (xfer->rx_done != xfer->rx_len) 1306 return true; 1307 1308 spin_lock_irqsave(&dsi->transfer_lock, flags); 1309 1310 list_del_init(&xfer->list); 1311 start = !list_empty(&dsi->transfer_list); 1312 1313 spin_unlock_irqrestore(&dsi->transfer_lock, flags); 1314 1315 if (!xfer->rx_len) 1316 xfer->result = 0; 1317 complete(&xfer->completed); 1318 1319 return start; 1320 } 1321 1322 static void samsung_dsim_remove_transfer(struct samsung_dsim *dsi, 1323 struct samsung_dsim_transfer *xfer) 1324 { 1325 unsigned long flags; 1326 bool start; 1327 1328 spin_lock_irqsave(&dsi->transfer_lock, flags); 1329 1330 if (!list_empty(&dsi->transfer_list) && 1331 xfer == list_first_entry(&dsi->transfer_list, 1332 struct samsung_dsim_transfer, list)) { 1333 list_del_init(&xfer->list); 1334 start = !list_empty(&dsi->transfer_list); 1335 spin_unlock_irqrestore(&dsi->transfer_lock, flags); 1336 if (start) 1337 samsung_dsim_transfer_start(dsi); 1338 return; 1339 } 1340 1341 list_del_init(&xfer->list); 1342 1343 spin_unlock_irqrestore(&dsi->transfer_lock, flags); 1344 } 1345 1346 static int samsung_dsim_transfer(struct samsung_dsim *dsi, 1347 struct samsung_dsim_transfer *xfer) 1348 { 1349 unsigned long flags; 1350 bool stopped; 1351 1352 xfer->tx_done = 0; 1353 xfer->rx_done = 0; 1354 xfer->result = -ETIMEDOUT; 1355 init_completion(&xfer->completed); 1356 1357 spin_lock_irqsave(&dsi->transfer_lock, flags); 1358 1359 stopped = list_empty(&dsi->transfer_list); 1360 list_add_tail(&xfer->list, &dsi->transfer_list); 1361 1362 spin_unlock_irqrestore(&dsi->transfer_lock, flags); 1363 1364 if (stopped) 1365 samsung_dsim_transfer_start(dsi); 1366 1367 wait_for_completion_timeout(&xfer->completed, 1368 msecs_to_jiffies(DSI_XFER_TIMEOUT_MS)); 1369 if (xfer->result == -ETIMEDOUT) { 1370 struct mipi_dsi_packet *pkt = &xfer->packet; 1371 1372 samsung_dsim_remove_transfer(dsi, xfer); 1373 dev_err(dsi->dev, "xfer timed out: %*ph %*ph\n", 4, pkt->header, 1374 (int)pkt->payload_length, pkt->payload); 1375 return -ETIMEDOUT; 1376 } 1377 1378 /* Also covers hardware timeout condition */ 1379 return xfer->result; 1380 } 1381 1382 static irqreturn_t samsung_dsim_irq(int irq, void *dev_id) 1383 { 1384 struct samsung_dsim *dsi = dev_id; 1385 u32 status; 1386 1387 status = samsung_dsim_read(dsi, DSIM_INTSRC_REG); 1388 if (!status) { 1389 static unsigned long j; 1390 1391 if (printk_timed_ratelimit(&j, 500)) 1392 dev_warn(dsi->dev, "spurious interrupt\n"); 1393 return IRQ_HANDLED; 1394 } 1395 samsung_dsim_write(dsi, DSIM_INTSRC_REG, status); 1396 1397 if (status & DSIM_INT_SW_RST_RELEASE) { 1398 unsigned long mask = ~(DSIM_INT_RX_DONE | 1399 DSIM_INT_SFR_FIFO_EMPTY | 1400 DSIM_INT_SFR_HDR_FIFO_EMPTY | 1401 DSIM_INT_RX_ECC_ERR | 1402 DSIM_INT_SW_RST_RELEASE); 1403 samsung_dsim_write(dsi, DSIM_INTMSK_REG, mask); 1404 complete(&dsi->completed); 1405 return IRQ_HANDLED; 1406 } 1407 1408 if (!(status & (DSIM_INT_RX_DONE | DSIM_INT_SFR_FIFO_EMPTY | 1409 DSIM_INT_PLL_STABLE))) 1410 return IRQ_HANDLED; 1411 1412 if (samsung_dsim_transfer_finish(dsi)) 1413 samsung_dsim_transfer_start(dsi); 1414 1415 return IRQ_HANDLED; 1416 } 1417 1418 static void samsung_dsim_enable_irq(struct samsung_dsim *dsi) 1419 { 1420 enable_irq(dsi->irq); 1421 1422 if (dsi->te_gpio) 1423 enable_irq(gpiod_to_irq(dsi->te_gpio)); 1424 } 1425 1426 static void samsung_dsim_disable_irq(struct samsung_dsim *dsi) 1427 { 1428 if (dsi->te_gpio) 1429 disable_irq(gpiod_to_irq(dsi->te_gpio)); 1430 1431 disable_irq(dsi->irq); 1432 } 1433 1434 static void samsung_dsim_set_stop_state(struct samsung_dsim *dsi, bool enable) 1435 { 1436 u32 reg = samsung_dsim_read(dsi, DSIM_ESCMODE_REG); 1437 1438 if (enable) 1439 reg |= DSIM_FORCE_STOP_STATE; 1440 else 1441 reg &= ~DSIM_FORCE_STOP_STATE; 1442 1443 samsung_dsim_write(dsi, DSIM_ESCMODE_REG, reg); 1444 } 1445 1446 static int samsung_dsim_init(struct samsung_dsim *dsi) 1447 { 1448 const struct samsung_dsim_driver_data *driver_data = dsi->driver_data; 1449 1450 if (dsi->state & DSIM_STATE_INITIALIZED) 1451 return 0; 1452 1453 samsung_dsim_reset(dsi); 1454 samsung_dsim_enable_irq(dsi); 1455 1456 if (driver_data->reg_values[RESET_TYPE] == DSIM_FUNCRST) 1457 samsung_dsim_enable_lane(dsi, BIT(dsi->lanes) - 1); 1458 1459 samsung_dsim_enable_clock(dsi); 1460 if (driver_data->wait_for_reset) 1461 samsung_dsim_wait_for_reset(dsi); 1462 samsung_dsim_set_phy_ctrl(dsi); 1463 samsung_dsim_init_link(dsi); 1464 1465 dsi->state |= DSIM_STATE_INITIALIZED; 1466 1467 return 0; 1468 } 1469 1470 static void samsung_dsim_atomic_pre_enable(struct drm_bridge *bridge, 1471 struct drm_bridge_state *old_bridge_state) 1472 { 1473 struct samsung_dsim *dsi = bridge_to_dsi(bridge); 1474 int ret; 1475 1476 if (dsi->state & DSIM_STATE_ENABLED) 1477 return; 1478 1479 ret = pm_runtime_resume_and_get(dsi->dev); 1480 if (ret < 0) { 1481 dev_err(dsi->dev, "failed to enable DSI device.\n"); 1482 return; 1483 } 1484 1485 dsi->state |= DSIM_STATE_ENABLED; 1486 1487 /* 1488 * For Exynos-DSIM the downstream bridge, or panel are expecting 1489 * the host initialization during DSI transfer. 1490 */ 1491 if (!samsung_dsim_hw_is_exynos(dsi->plat_data->hw_type)) { 1492 ret = samsung_dsim_init(dsi); 1493 if (ret) 1494 return; 1495 1496 samsung_dsim_set_display_mode(dsi); 1497 samsung_dsim_set_display_enable(dsi, true); 1498 } 1499 } 1500 1501 static void samsung_dsim_atomic_enable(struct drm_bridge *bridge, 1502 struct drm_bridge_state *old_bridge_state) 1503 { 1504 struct samsung_dsim *dsi = bridge_to_dsi(bridge); 1505 1506 if (samsung_dsim_hw_is_exynos(dsi->plat_data->hw_type)) { 1507 samsung_dsim_set_display_mode(dsi); 1508 samsung_dsim_set_display_enable(dsi, true); 1509 } else { 1510 samsung_dsim_set_stop_state(dsi, false); 1511 } 1512 1513 dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE; 1514 } 1515 1516 static void samsung_dsim_atomic_disable(struct drm_bridge *bridge, 1517 struct drm_bridge_state *old_bridge_state) 1518 { 1519 struct samsung_dsim *dsi = bridge_to_dsi(bridge); 1520 1521 if (!(dsi->state & DSIM_STATE_ENABLED)) 1522 return; 1523 1524 if (!samsung_dsim_hw_is_exynos(dsi->plat_data->hw_type)) 1525 samsung_dsim_set_stop_state(dsi, true); 1526 1527 dsi->state &= ~DSIM_STATE_VIDOUT_AVAILABLE; 1528 } 1529 1530 static void samsung_dsim_atomic_post_disable(struct drm_bridge *bridge, 1531 struct drm_bridge_state *old_bridge_state) 1532 { 1533 struct samsung_dsim *dsi = bridge_to_dsi(bridge); 1534 1535 samsung_dsim_set_display_enable(dsi, false); 1536 1537 dsi->state &= ~DSIM_STATE_ENABLED; 1538 pm_runtime_put_sync(dsi->dev); 1539 } 1540 1541 /* 1542 * This pixel output formats list referenced from, 1543 * AN13573 i.MX 8/RT MIPI DSI/CSI-2, Rev. 0, 21 March 2022 1544 * 3.7.4 Pixel formats 1545 * Table 14. DSI pixel packing formats 1546 */ 1547 static const u32 samsung_dsim_pixel_output_fmts[] = { 1548 MEDIA_BUS_FMT_YUYV10_1X20, 1549 MEDIA_BUS_FMT_YUYV12_1X24, 1550 MEDIA_BUS_FMT_UYVY8_1X16, 1551 MEDIA_BUS_FMT_RGB101010_1X30, 1552 MEDIA_BUS_FMT_RGB121212_1X36, 1553 MEDIA_BUS_FMT_RGB565_1X16, 1554 MEDIA_BUS_FMT_RGB666_1X18, 1555 MEDIA_BUS_FMT_RGB888_1X24, 1556 }; 1557 1558 static bool samsung_dsim_pixel_output_fmt_supported(u32 fmt) 1559 { 1560 int i; 1561 1562 if (fmt == MEDIA_BUS_FMT_FIXED) 1563 return false; 1564 1565 for (i = 0; i < ARRAY_SIZE(samsung_dsim_pixel_output_fmts); i++) { 1566 if (samsung_dsim_pixel_output_fmts[i] == fmt) 1567 return true; 1568 } 1569 1570 return false; 1571 } 1572 1573 static u32 * 1574 samsung_dsim_atomic_get_input_bus_fmts(struct drm_bridge *bridge, 1575 struct drm_bridge_state *bridge_state, 1576 struct drm_crtc_state *crtc_state, 1577 struct drm_connector_state *conn_state, 1578 u32 output_fmt, 1579 unsigned int *num_input_fmts) 1580 { 1581 u32 *input_fmts; 1582 1583 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL); 1584 if (!input_fmts) 1585 return NULL; 1586 1587 if (!samsung_dsim_pixel_output_fmt_supported(output_fmt)) 1588 /* 1589 * Some bridge/display drivers are still not able to pass the 1590 * correct format, so handle those pipelines by falling back 1591 * to the default format till the supported formats finalized. 1592 */ 1593 output_fmt = MEDIA_BUS_FMT_RGB888_1X24; 1594 1595 input_fmts[0] = output_fmt; 1596 *num_input_fmts = 1; 1597 1598 return input_fmts; 1599 } 1600 1601 static int samsung_dsim_atomic_check(struct drm_bridge *bridge, 1602 struct drm_bridge_state *bridge_state, 1603 struct drm_crtc_state *crtc_state, 1604 struct drm_connector_state *conn_state) 1605 { 1606 struct samsung_dsim *dsi = bridge_to_dsi(bridge); 1607 struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode; 1608 1609 /* 1610 * The i.MX8M Mini/Nano glue logic between LCDIF and DSIM 1611 * inverts HS/VS/DE sync signals polarity, therefore, while 1612 * i.MX 8M Mini Applications Processor Reference Manual Rev. 3, 11/2020 1613 * 13.6.3.5.2 RGB interface 1614 * i.MX 8M Nano Applications Processor Reference Manual Rev. 2, 07/2022 1615 * 13.6.2.7.2 RGB interface 1616 * both claim "Vsync, Hsync, and VDEN are active high signals.", the 1617 * LCDIF must generate inverted HS/VS/DE signals, i.e. active LOW. 1618 * 1619 * The i.MX8M Plus glue logic between LCDIFv3 and DSIM does not 1620 * implement the same behavior, therefore LCDIFv3 must generate 1621 * HS/VS/DE signals active HIGH. 1622 */ 1623 if (dsi->plat_data->hw_type == DSIM_TYPE_IMX8MM) { 1624 adjusted_mode->flags |= (DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC); 1625 adjusted_mode->flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC); 1626 } else if (dsi->plat_data->hw_type == DSIM_TYPE_IMX8MP) { 1627 adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC); 1628 adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC); 1629 } 1630 1631 return 0; 1632 } 1633 1634 static void samsung_dsim_mode_set(struct drm_bridge *bridge, 1635 const struct drm_display_mode *mode, 1636 const struct drm_display_mode *adjusted_mode) 1637 { 1638 struct samsung_dsim *dsi = bridge_to_dsi(bridge); 1639 1640 drm_mode_copy(&dsi->mode, adjusted_mode); 1641 } 1642 1643 static int samsung_dsim_attach(struct drm_bridge *bridge, 1644 enum drm_bridge_attach_flags flags) 1645 { 1646 struct samsung_dsim *dsi = bridge_to_dsi(bridge); 1647 1648 return drm_bridge_attach(bridge->encoder, dsi->out_bridge, bridge, 1649 flags); 1650 } 1651 1652 static const struct drm_bridge_funcs samsung_dsim_bridge_funcs = { 1653 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 1654 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 1655 .atomic_reset = drm_atomic_helper_bridge_reset, 1656 .atomic_get_input_bus_fmts = samsung_dsim_atomic_get_input_bus_fmts, 1657 .atomic_check = samsung_dsim_atomic_check, 1658 .atomic_pre_enable = samsung_dsim_atomic_pre_enable, 1659 .atomic_enable = samsung_dsim_atomic_enable, 1660 .atomic_disable = samsung_dsim_atomic_disable, 1661 .atomic_post_disable = samsung_dsim_atomic_post_disable, 1662 .mode_set = samsung_dsim_mode_set, 1663 .attach = samsung_dsim_attach, 1664 }; 1665 1666 static irqreturn_t samsung_dsim_te_irq_handler(int irq, void *dev_id) 1667 { 1668 struct samsung_dsim *dsi = (struct samsung_dsim *)dev_id; 1669 const struct samsung_dsim_plat_data *pdata = dsi->plat_data; 1670 1671 if (pdata->host_ops && pdata->host_ops->te_irq_handler) 1672 return pdata->host_ops->te_irq_handler(dsi); 1673 1674 return IRQ_HANDLED; 1675 } 1676 1677 static int samsung_dsim_register_te_irq(struct samsung_dsim *dsi, struct device *dev) 1678 { 1679 int te_gpio_irq; 1680 int ret; 1681 1682 dsi->te_gpio = devm_gpiod_get_optional(dev, "te", GPIOD_IN); 1683 if (!dsi->te_gpio) 1684 return 0; 1685 else if (IS_ERR(dsi->te_gpio)) 1686 return dev_err_probe(dev, PTR_ERR(dsi->te_gpio), "failed to get te GPIO\n"); 1687 1688 te_gpio_irq = gpiod_to_irq(dsi->te_gpio); 1689 1690 ret = request_threaded_irq(te_gpio_irq, samsung_dsim_te_irq_handler, NULL, 1691 IRQF_TRIGGER_RISING | IRQF_NO_AUTOEN, "TE", dsi); 1692 if (ret) { 1693 dev_err(dsi->dev, "request interrupt failed with %d\n", ret); 1694 gpiod_put(dsi->te_gpio); 1695 return ret; 1696 } 1697 1698 return 0; 1699 } 1700 1701 static int samsung_dsim_host_attach(struct mipi_dsi_host *host, 1702 struct mipi_dsi_device *device) 1703 { 1704 struct samsung_dsim *dsi = host_to_dsi(host); 1705 const struct samsung_dsim_plat_data *pdata = dsi->plat_data; 1706 struct device *dev = dsi->dev; 1707 struct device_node *np = dev->of_node; 1708 struct device_node *remote; 1709 struct drm_panel *panel; 1710 int ret; 1711 1712 /* 1713 * Devices can also be child nodes when we also control that device 1714 * through the upstream device (ie, MIPI-DCS for a MIPI-DSI device). 1715 * 1716 * Lookup for a child node of the given parent that isn't either port 1717 * or ports. 1718 */ 1719 for_each_available_child_of_node(np, remote) { 1720 if (of_node_name_eq(remote, "port") || 1721 of_node_name_eq(remote, "ports")) 1722 continue; 1723 1724 goto of_find_panel_or_bridge; 1725 } 1726 1727 /* 1728 * of_graph_get_remote_node() produces a noisy error message if port 1729 * node isn't found and the absence of the port is a legit case here, 1730 * so at first we silently check whether graph presents in the 1731 * device-tree node. 1732 */ 1733 if (!of_graph_is_present(np)) 1734 return -ENODEV; 1735 1736 remote = of_graph_get_remote_node(np, 1, 0); 1737 1738 of_find_panel_or_bridge: 1739 if (!remote) 1740 return -ENODEV; 1741 1742 panel = of_drm_find_panel(remote); 1743 if (!IS_ERR(panel)) { 1744 dsi->out_bridge = devm_drm_panel_bridge_add(dev, panel); 1745 } else { 1746 dsi->out_bridge = of_drm_find_bridge(remote); 1747 if (!dsi->out_bridge) 1748 dsi->out_bridge = ERR_PTR(-EINVAL); 1749 } 1750 1751 of_node_put(remote); 1752 1753 if (IS_ERR(dsi->out_bridge)) { 1754 ret = PTR_ERR(dsi->out_bridge); 1755 DRM_DEV_ERROR(dev, "failed to find the bridge: %d\n", ret); 1756 return ret; 1757 } 1758 1759 DRM_DEV_INFO(dev, "Attached %s device (lanes:%d bpp:%d mode-flags:0x%lx)\n", 1760 device->name, device->lanes, 1761 mipi_dsi_pixel_format_to_bpp(device->format), 1762 device->mode_flags); 1763 1764 drm_bridge_add(&dsi->bridge); 1765 1766 /* 1767 * This is a temporary solution and should be made by more generic way. 1768 * 1769 * If attached panel device is for command mode one, dsi should register 1770 * TE interrupt handler. 1771 */ 1772 if (!(device->mode_flags & MIPI_DSI_MODE_VIDEO)) { 1773 ret = samsung_dsim_register_te_irq(dsi, &device->dev); 1774 if (ret) 1775 return ret; 1776 } 1777 1778 if (pdata->host_ops && pdata->host_ops->attach) { 1779 ret = pdata->host_ops->attach(dsi, device); 1780 if (ret) 1781 return ret; 1782 } 1783 1784 dsi->lanes = device->lanes; 1785 dsi->format = device->format; 1786 dsi->mode_flags = device->mode_flags; 1787 1788 return 0; 1789 } 1790 1791 static void samsung_dsim_unregister_te_irq(struct samsung_dsim *dsi) 1792 { 1793 if (dsi->te_gpio) { 1794 free_irq(gpiod_to_irq(dsi->te_gpio), dsi); 1795 gpiod_put(dsi->te_gpio); 1796 } 1797 } 1798 1799 static int samsung_dsim_host_detach(struct mipi_dsi_host *host, 1800 struct mipi_dsi_device *device) 1801 { 1802 struct samsung_dsim *dsi = host_to_dsi(host); 1803 const struct samsung_dsim_plat_data *pdata = dsi->plat_data; 1804 1805 dsi->out_bridge = NULL; 1806 1807 if (pdata->host_ops && pdata->host_ops->detach) 1808 pdata->host_ops->detach(dsi, device); 1809 1810 samsung_dsim_unregister_te_irq(dsi); 1811 1812 drm_bridge_remove(&dsi->bridge); 1813 1814 return 0; 1815 } 1816 1817 static ssize_t samsung_dsim_host_transfer(struct mipi_dsi_host *host, 1818 const struct mipi_dsi_msg *msg) 1819 { 1820 struct samsung_dsim *dsi = host_to_dsi(host); 1821 struct samsung_dsim_transfer xfer; 1822 int ret; 1823 1824 if (!(dsi->state & DSIM_STATE_ENABLED)) 1825 return -EINVAL; 1826 1827 ret = samsung_dsim_init(dsi); 1828 if (ret) 1829 return ret; 1830 1831 samsung_dsim_set_stop_state(dsi, false); 1832 1833 ret = mipi_dsi_create_packet(&xfer.packet, msg); 1834 if (ret < 0) 1835 return ret; 1836 1837 xfer.rx_len = msg->rx_len; 1838 xfer.rx_payload = msg->rx_buf; 1839 xfer.flags = msg->flags; 1840 1841 ret = samsung_dsim_transfer(dsi, &xfer); 1842 return (ret < 0) ? ret : xfer.rx_done; 1843 } 1844 1845 static const struct mipi_dsi_host_ops samsung_dsim_ops = { 1846 .attach = samsung_dsim_host_attach, 1847 .detach = samsung_dsim_host_detach, 1848 .transfer = samsung_dsim_host_transfer, 1849 }; 1850 1851 static int samsung_dsim_of_read_u32(const struct device_node *np, 1852 const char *propname, u32 *out_value, bool optional) 1853 { 1854 int ret = of_property_read_u32(np, propname, out_value); 1855 1856 if (ret < 0 && !optional) 1857 pr_err("%pOF: failed to get '%s' property\n", np, propname); 1858 1859 return ret; 1860 } 1861 1862 static int samsung_dsim_parse_dt(struct samsung_dsim *dsi) 1863 { 1864 struct device *dev = dsi->dev; 1865 struct device_node *node = dev->of_node; 1866 u32 lane_polarities[5] = { 0 }; 1867 struct device_node *endpoint; 1868 int i, nr_lanes, ret; 1869 1870 ret = samsung_dsim_of_read_u32(node, "samsung,pll-clock-frequency", 1871 &dsi->pll_clk_rate, 1); 1872 /* If it doesn't exist, read it from the clock instead of failing */ 1873 if (ret < 0) { 1874 dev_dbg(dev, "Using sclk_mipi for pll clock frequency\n"); 1875 dsi->pll_clk = devm_clk_get(dev, "sclk_mipi"); 1876 if (IS_ERR(dsi->pll_clk)) 1877 return PTR_ERR(dsi->pll_clk); 1878 } 1879 1880 /* If it doesn't exist, use pixel clock instead of failing */ 1881 ret = samsung_dsim_of_read_u32(node, "samsung,burst-clock-frequency", 1882 &dsi->burst_clk_rate, 1); 1883 if (ret < 0) { 1884 dev_dbg(dev, "Using pixel clock for HS clock frequency\n"); 1885 dsi->burst_clk_rate = 0; 1886 } 1887 1888 ret = samsung_dsim_of_read_u32(node, "samsung,esc-clock-frequency", 1889 &dsi->esc_clk_rate, 0); 1890 if (ret < 0) 1891 return ret; 1892 1893 endpoint = of_graph_get_endpoint_by_regs(node, 1, -1); 1894 nr_lanes = of_property_count_u32_elems(endpoint, "data-lanes"); 1895 if (nr_lanes > 0 && nr_lanes <= 4) { 1896 /* Polarity 0 is clock lane, 1..4 are data lanes. */ 1897 of_property_read_u32_array(endpoint, "lane-polarities", 1898 lane_polarities, nr_lanes + 1); 1899 for (i = 1; i <= nr_lanes; i++) { 1900 if (lane_polarities[1] != lane_polarities[i]) 1901 DRM_DEV_ERROR(dsi->dev, "Data lanes polarities do not match"); 1902 } 1903 if (lane_polarities[0]) 1904 dsi->swap_dn_dp_clk = true; 1905 if (lane_polarities[1]) 1906 dsi->swap_dn_dp_data = true; 1907 } 1908 1909 return 0; 1910 } 1911 1912 static int generic_dsim_register_host(struct samsung_dsim *dsi) 1913 { 1914 return mipi_dsi_host_register(&dsi->dsi_host); 1915 } 1916 1917 static void generic_dsim_unregister_host(struct samsung_dsim *dsi) 1918 { 1919 mipi_dsi_host_unregister(&dsi->dsi_host); 1920 } 1921 1922 static const struct samsung_dsim_host_ops generic_dsim_host_ops = { 1923 .register_host = generic_dsim_register_host, 1924 .unregister_host = generic_dsim_unregister_host, 1925 }; 1926 1927 static const struct drm_bridge_timings samsung_dsim_bridge_timings_de_high = { 1928 .input_bus_flags = DRM_BUS_FLAG_DE_HIGH, 1929 }; 1930 1931 static const struct drm_bridge_timings samsung_dsim_bridge_timings_de_low = { 1932 .input_bus_flags = DRM_BUS_FLAG_DE_LOW, 1933 }; 1934 1935 int samsung_dsim_probe(struct platform_device *pdev) 1936 { 1937 struct device *dev = &pdev->dev; 1938 struct samsung_dsim *dsi; 1939 int ret, i; 1940 1941 dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL); 1942 if (!dsi) 1943 return -ENOMEM; 1944 1945 init_completion(&dsi->completed); 1946 spin_lock_init(&dsi->transfer_lock); 1947 INIT_LIST_HEAD(&dsi->transfer_list); 1948 1949 dsi->dsi_host.ops = &samsung_dsim_ops; 1950 dsi->dsi_host.dev = dev; 1951 1952 dsi->dev = dev; 1953 dsi->plat_data = of_device_get_match_data(dev); 1954 dsi->driver_data = samsung_dsim_types[dsi->plat_data->hw_type]; 1955 1956 dsi->supplies[0].supply = "vddcore"; 1957 dsi->supplies[1].supply = "vddio"; 1958 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(dsi->supplies), 1959 dsi->supplies); 1960 if (ret) 1961 return dev_err_probe(dev, ret, "failed to get regulators\n"); 1962 1963 dsi->clks = devm_kcalloc(dev, dsi->driver_data->num_clks, 1964 sizeof(*dsi->clks), GFP_KERNEL); 1965 if (!dsi->clks) 1966 return -ENOMEM; 1967 1968 for (i = 0; i < dsi->driver_data->num_clks; i++) { 1969 dsi->clks[i] = devm_clk_get(dev, clk_names[i]); 1970 if (IS_ERR(dsi->clks[i])) { 1971 if (strcmp(clk_names[i], "sclk_mipi") == 0) { 1972 dsi->clks[i] = devm_clk_get(dev, OLD_SCLK_MIPI_CLK_NAME); 1973 if (!IS_ERR(dsi->clks[i])) 1974 continue; 1975 } 1976 1977 dev_info(dev, "failed to get the clock: %s\n", clk_names[i]); 1978 return PTR_ERR(dsi->clks[i]); 1979 } 1980 } 1981 1982 dsi->reg_base = devm_platform_ioremap_resource(pdev, 0); 1983 if (IS_ERR(dsi->reg_base)) 1984 return PTR_ERR(dsi->reg_base); 1985 1986 dsi->phy = devm_phy_optional_get(dev, "dsim"); 1987 if (IS_ERR(dsi->phy)) { 1988 dev_info(dev, "failed to get dsim phy\n"); 1989 return PTR_ERR(dsi->phy); 1990 } 1991 1992 dsi->irq = platform_get_irq(pdev, 0); 1993 if (dsi->irq < 0) 1994 return dsi->irq; 1995 1996 ret = devm_request_threaded_irq(dev, dsi->irq, NULL, 1997 samsung_dsim_irq, 1998 IRQF_ONESHOT | IRQF_NO_AUTOEN, 1999 dev_name(dev), dsi); 2000 if (ret) { 2001 dev_err(dev, "failed to request dsi irq\n"); 2002 return ret; 2003 } 2004 2005 ret = samsung_dsim_parse_dt(dsi); 2006 if (ret) 2007 return ret; 2008 2009 platform_set_drvdata(pdev, dsi); 2010 2011 pm_runtime_enable(dev); 2012 2013 dsi->bridge.funcs = &samsung_dsim_bridge_funcs; 2014 dsi->bridge.of_node = dev->of_node; 2015 dsi->bridge.type = DRM_MODE_CONNECTOR_DSI; 2016 2017 /* DE_LOW: i.MX8M Mini/Nano LCDIF-DSIM glue logic inverts HS/VS/DE */ 2018 if (dsi->plat_data->hw_type == DSIM_TYPE_IMX8MM) 2019 dsi->bridge.timings = &samsung_dsim_bridge_timings_de_low; 2020 else 2021 dsi->bridge.timings = &samsung_dsim_bridge_timings_de_high; 2022 2023 if (dsi->plat_data->host_ops && dsi->plat_data->host_ops->register_host) 2024 ret = dsi->plat_data->host_ops->register_host(dsi); 2025 2026 if (ret) 2027 goto err_disable_runtime; 2028 2029 return 0; 2030 2031 err_disable_runtime: 2032 pm_runtime_disable(dev); 2033 2034 return ret; 2035 } 2036 EXPORT_SYMBOL_GPL(samsung_dsim_probe); 2037 2038 void samsung_dsim_remove(struct platform_device *pdev) 2039 { 2040 struct samsung_dsim *dsi = platform_get_drvdata(pdev); 2041 2042 pm_runtime_disable(&pdev->dev); 2043 2044 if (dsi->plat_data->host_ops && dsi->plat_data->host_ops->unregister_host) 2045 dsi->plat_data->host_ops->unregister_host(dsi); 2046 } 2047 EXPORT_SYMBOL_GPL(samsung_dsim_remove); 2048 2049 static int __maybe_unused samsung_dsim_suspend(struct device *dev) 2050 { 2051 struct samsung_dsim *dsi = dev_get_drvdata(dev); 2052 const struct samsung_dsim_driver_data *driver_data = dsi->driver_data; 2053 int ret, i; 2054 2055 usleep_range(10000, 20000); 2056 2057 if (dsi->state & DSIM_STATE_INITIALIZED) { 2058 dsi->state &= ~DSIM_STATE_INITIALIZED; 2059 2060 samsung_dsim_disable_clock(dsi); 2061 2062 samsung_dsim_disable_irq(dsi); 2063 } 2064 2065 dsi->state &= ~DSIM_STATE_CMD_LPM; 2066 2067 phy_power_off(dsi->phy); 2068 2069 for (i = driver_data->num_clks - 1; i > -1; i--) 2070 clk_disable_unprepare(dsi->clks[i]); 2071 2072 ret = regulator_bulk_disable(ARRAY_SIZE(dsi->supplies), dsi->supplies); 2073 if (ret < 0) 2074 dev_err(dsi->dev, "cannot disable regulators %d\n", ret); 2075 2076 return 0; 2077 } 2078 2079 static int __maybe_unused samsung_dsim_resume(struct device *dev) 2080 { 2081 struct samsung_dsim *dsi = dev_get_drvdata(dev); 2082 const struct samsung_dsim_driver_data *driver_data = dsi->driver_data; 2083 int ret, i; 2084 2085 ret = regulator_bulk_enable(ARRAY_SIZE(dsi->supplies), dsi->supplies); 2086 if (ret < 0) { 2087 dev_err(dsi->dev, "cannot enable regulators %d\n", ret); 2088 return ret; 2089 } 2090 2091 for (i = 0; i < driver_data->num_clks; i++) { 2092 ret = clk_prepare_enable(dsi->clks[i]); 2093 if (ret < 0) 2094 goto err_clk; 2095 } 2096 2097 ret = phy_power_on(dsi->phy); 2098 if (ret < 0) { 2099 dev_err(dsi->dev, "cannot enable phy %d\n", ret); 2100 goto err_clk; 2101 } 2102 2103 return 0; 2104 2105 err_clk: 2106 while (--i > -1) 2107 clk_disable_unprepare(dsi->clks[i]); 2108 regulator_bulk_disable(ARRAY_SIZE(dsi->supplies), dsi->supplies); 2109 2110 return ret; 2111 } 2112 2113 const struct dev_pm_ops samsung_dsim_pm_ops = { 2114 SET_RUNTIME_PM_OPS(samsung_dsim_suspend, samsung_dsim_resume, NULL) 2115 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 2116 pm_runtime_force_resume) 2117 }; 2118 EXPORT_SYMBOL_GPL(samsung_dsim_pm_ops); 2119 2120 static const struct samsung_dsim_plat_data samsung_dsim_imx8mm_pdata = { 2121 .hw_type = DSIM_TYPE_IMX8MM, 2122 .host_ops = &generic_dsim_host_ops, 2123 }; 2124 2125 static const struct samsung_dsim_plat_data samsung_dsim_imx8mp_pdata = { 2126 .hw_type = DSIM_TYPE_IMX8MP, 2127 .host_ops = &generic_dsim_host_ops, 2128 }; 2129 2130 static const struct of_device_id samsung_dsim_of_match[] = { 2131 { 2132 .compatible = "fsl,imx8mm-mipi-dsim", 2133 .data = &samsung_dsim_imx8mm_pdata, 2134 }, 2135 { 2136 .compatible = "fsl,imx8mp-mipi-dsim", 2137 .data = &samsung_dsim_imx8mp_pdata, 2138 }, 2139 { /* sentinel. */ } 2140 }; 2141 MODULE_DEVICE_TABLE(of, samsung_dsim_of_match); 2142 2143 static struct platform_driver samsung_dsim_driver = { 2144 .probe = samsung_dsim_probe, 2145 .remove_new = samsung_dsim_remove, 2146 .driver = { 2147 .name = "samsung-dsim", 2148 .pm = &samsung_dsim_pm_ops, 2149 .of_match_table = samsung_dsim_of_match, 2150 }, 2151 }; 2152 2153 module_platform_driver(samsung_dsim_driver); 2154 2155 MODULE_AUTHOR("Jagan Teki <jagan@amarulasolutions.com>"); 2156 MODULE_DESCRIPTION("Samsung MIPI DSIM controller bridge"); 2157 MODULE_LICENSE("GPL"); 2158