1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Toppoly TD028TTEC1 Panel Driver 4 * 5 * Copyright (C) 2019 Texas Instruments Incorporated 6 * 7 * Based on the omapdrm-specific panel-tpo-td028ttec1 driver 8 * 9 * Copyright (C) 2008 Nokia Corporation 10 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> 11 * 12 * Neo 1973 code (jbt6k74.c): 13 * Copyright (C) 2006-2007 OpenMoko, Inc. 14 * Author: Harald Welte <laforge@openmoko.org> 15 * 16 * Ported and adapted from Neo 1973 U-Boot by: 17 * H. Nikolaus Schaller <hns@goldelico.com> 18 */ 19 20 #include <linux/delay.h> 21 #include <linux/module.h> 22 #include <linux/spi/spi.h> 23 24 #include <drm/drm_connector.h> 25 #include <drm/drm_modes.h> 26 #include <drm/drm_panel.h> 27 28 #define JBT_COMMAND 0x000 29 #define JBT_DATA 0x100 30 31 #define JBT_REG_SLEEP_IN 0x10 32 #define JBT_REG_SLEEP_OUT 0x11 33 34 #define JBT_REG_DISPLAY_OFF 0x28 35 #define JBT_REG_DISPLAY_ON 0x29 36 37 #define JBT_REG_RGB_FORMAT 0x3a 38 #define JBT_REG_QUAD_RATE 0x3b 39 40 #define JBT_REG_POWER_ON_OFF 0xb0 41 #define JBT_REG_BOOSTER_OP 0xb1 42 #define JBT_REG_BOOSTER_MODE 0xb2 43 #define JBT_REG_BOOSTER_FREQ 0xb3 44 #define JBT_REG_OPAMP_SYSCLK 0xb4 45 #define JBT_REG_VSC_VOLTAGE 0xb5 46 #define JBT_REG_VCOM_VOLTAGE 0xb6 47 #define JBT_REG_EXT_DISPL 0xb7 48 #define JBT_REG_OUTPUT_CONTROL 0xb8 49 #define JBT_REG_DCCLK_DCEV 0xb9 50 #define JBT_REG_DISPLAY_MODE1 0xba 51 #define JBT_REG_DISPLAY_MODE2 0xbb 52 #define JBT_REG_DISPLAY_MODE 0xbc 53 #define JBT_REG_ASW_SLEW 0xbd 54 #define JBT_REG_DUMMY_DISPLAY 0xbe 55 #define JBT_REG_DRIVE_SYSTEM 0xbf 56 57 #define JBT_REG_SLEEP_OUT_FR_A 0xc0 58 #define JBT_REG_SLEEP_OUT_FR_B 0xc1 59 #define JBT_REG_SLEEP_OUT_FR_C 0xc2 60 #define JBT_REG_SLEEP_IN_LCCNT_D 0xc3 61 #define JBT_REG_SLEEP_IN_LCCNT_E 0xc4 62 #define JBT_REG_SLEEP_IN_LCCNT_F 0xc5 63 #define JBT_REG_SLEEP_IN_LCCNT_G 0xc6 64 65 #define JBT_REG_GAMMA1_FINE_1 0xc7 66 #define JBT_REG_GAMMA1_FINE_2 0xc8 67 #define JBT_REG_GAMMA1_INCLINATION 0xc9 68 #define JBT_REG_GAMMA1_BLUE_OFFSET 0xca 69 70 #define JBT_REG_BLANK_CONTROL 0xcf 71 #define JBT_REG_BLANK_TH_TV 0xd0 72 #define JBT_REG_CKV_ON_OFF 0xd1 73 #define JBT_REG_CKV_1_2 0xd2 74 #define JBT_REG_OEV_TIMING 0xd3 75 #define JBT_REG_ASW_TIMING_1 0xd4 76 #define JBT_REG_ASW_TIMING_2 0xd5 77 78 #define JBT_REG_HCLOCK_VGA 0xec 79 #define JBT_REG_HCLOCK_QVGA 0xed 80 81 struct td028ttec1_panel { 82 struct drm_panel panel; 83 84 struct spi_device *spi; 85 }; 86 87 #define to_td028ttec1_device(p) container_of(p, struct td028ttec1_panel, panel) 88 89 /* 90 * noinline_for_stack so we don't get multiple copies of tx_buf 91 * on the stack in case of gcc-plugin-structleak 92 */ 93 static int noinline_for_stack 94 jbt_ret_write_0(struct td028ttec1_panel *lcd, u8 reg, int *err) 95 { 96 struct spi_device *spi = lcd->spi; 97 u16 tx_buf = JBT_COMMAND | reg; 98 int ret; 99 100 if (err && *err) 101 return *err; 102 103 ret = spi_write(spi, (u8 *)&tx_buf, sizeof(tx_buf)); 104 if (ret < 0) { 105 dev_err(&spi->dev, "%s: SPI write failed: %d\n", __func__, ret); 106 if (err) 107 *err = ret; 108 } 109 110 return ret; 111 } 112 113 static int noinline_for_stack 114 jbt_reg_write_1(struct td028ttec1_panel *lcd, 115 u8 reg, u8 data, int *err) 116 { 117 struct spi_device *spi = lcd->spi; 118 u16 tx_buf[2]; 119 int ret; 120 121 if (err && *err) 122 return *err; 123 124 tx_buf[0] = JBT_COMMAND | reg; 125 tx_buf[1] = JBT_DATA | data; 126 127 ret = spi_write(spi, (u8 *)tx_buf, sizeof(tx_buf)); 128 if (ret < 0) { 129 dev_err(&spi->dev, "%s: SPI write failed: %d\n", __func__, ret); 130 if (err) 131 *err = ret; 132 } 133 134 return ret; 135 } 136 137 static int noinline_for_stack 138 jbt_reg_write_2(struct td028ttec1_panel *lcd, 139 u8 reg, u16 data, int *err) 140 { 141 struct spi_device *spi = lcd->spi; 142 u16 tx_buf[3]; 143 int ret; 144 145 if (err && *err) 146 return *err; 147 148 tx_buf[0] = JBT_COMMAND | reg; 149 tx_buf[1] = JBT_DATA | (data >> 8); 150 tx_buf[2] = JBT_DATA | (data & 0xff); 151 152 ret = spi_write(spi, (u8 *)tx_buf, sizeof(tx_buf)); 153 if (ret < 0) { 154 dev_err(&spi->dev, "%s: SPI write failed: %d\n", __func__, ret); 155 if (err) 156 *err = ret; 157 } 158 159 return ret; 160 } 161 162 static int td028ttec1_prepare(struct drm_panel *panel) 163 { 164 struct td028ttec1_panel *lcd = to_td028ttec1_device(panel); 165 unsigned int i; 166 int ret = 0; 167 168 /* Three times command zero */ 169 for (i = 0; i < 3; ++i) { 170 jbt_ret_write_0(lcd, 0x00, &ret); 171 usleep_range(1000, 2000); 172 } 173 174 /* deep standby out */ 175 jbt_reg_write_1(lcd, JBT_REG_POWER_ON_OFF, 0x17, &ret); 176 177 /* RGB I/F on, RAM write off, QVGA through, SIGCON enable */ 178 jbt_reg_write_1(lcd, JBT_REG_DISPLAY_MODE, 0x80, &ret); 179 180 /* Quad mode off */ 181 jbt_reg_write_1(lcd, JBT_REG_QUAD_RATE, 0x00, &ret); 182 183 /* AVDD on, XVDD on */ 184 jbt_reg_write_1(lcd, JBT_REG_POWER_ON_OFF, 0x16, &ret); 185 186 /* Output control */ 187 jbt_reg_write_2(lcd, JBT_REG_OUTPUT_CONTROL, 0xfff9, &ret); 188 189 /* Sleep mode off */ 190 jbt_ret_write_0(lcd, JBT_REG_SLEEP_OUT, &ret); 191 192 /* at this point we have like 50% grey */ 193 194 /* initialize register set */ 195 jbt_reg_write_1(lcd, JBT_REG_DISPLAY_MODE1, 0x01, &ret); 196 jbt_reg_write_1(lcd, JBT_REG_DISPLAY_MODE2, 0x00, &ret); 197 jbt_reg_write_1(lcd, JBT_REG_RGB_FORMAT, 0x60, &ret); 198 jbt_reg_write_1(lcd, JBT_REG_DRIVE_SYSTEM, 0x10, &ret); 199 jbt_reg_write_1(lcd, JBT_REG_BOOSTER_OP, 0x56, &ret); 200 jbt_reg_write_1(lcd, JBT_REG_BOOSTER_MODE, 0x33, &ret); 201 jbt_reg_write_1(lcd, JBT_REG_BOOSTER_FREQ, 0x11, &ret); 202 jbt_reg_write_1(lcd, JBT_REG_BOOSTER_FREQ, 0x11, &ret); 203 jbt_reg_write_1(lcd, JBT_REG_OPAMP_SYSCLK, 0x02, &ret); 204 jbt_reg_write_1(lcd, JBT_REG_VSC_VOLTAGE, 0x2b, &ret); 205 jbt_reg_write_1(lcd, JBT_REG_VCOM_VOLTAGE, 0x40, &ret); 206 jbt_reg_write_1(lcd, JBT_REG_EXT_DISPL, 0x03, &ret); 207 jbt_reg_write_1(lcd, JBT_REG_DCCLK_DCEV, 0x04, &ret); 208 /* 209 * default of 0x02 in JBT_REG_ASW_SLEW responsible for 72Hz requirement 210 * to avoid red / blue flicker 211 */ 212 jbt_reg_write_1(lcd, JBT_REG_ASW_SLEW, 0x04, &ret); 213 jbt_reg_write_1(lcd, JBT_REG_DUMMY_DISPLAY, 0x00, &ret); 214 215 jbt_reg_write_1(lcd, JBT_REG_SLEEP_OUT_FR_A, 0x11, &ret); 216 jbt_reg_write_1(lcd, JBT_REG_SLEEP_OUT_FR_B, 0x11, &ret); 217 jbt_reg_write_1(lcd, JBT_REG_SLEEP_OUT_FR_C, 0x11, &ret); 218 jbt_reg_write_2(lcd, JBT_REG_SLEEP_IN_LCCNT_D, 0x2040, &ret); 219 jbt_reg_write_2(lcd, JBT_REG_SLEEP_IN_LCCNT_E, 0x60c0, &ret); 220 jbt_reg_write_2(lcd, JBT_REG_SLEEP_IN_LCCNT_F, 0x1020, &ret); 221 jbt_reg_write_2(lcd, JBT_REG_SLEEP_IN_LCCNT_G, 0x60c0, &ret); 222 223 jbt_reg_write_2(lcd, JBT_REG_GAMMA1_FINE_1, 0x5533, &ret); 224 jbt_reg_write_1(lcd, JBT_REG_GAMMA1_FINE_2, 0x00, &ret); 225 jbt_reg_write_1(lcd, JBT_REG_GAMMA1_INCLINATION, 0x00, &ret); 226 jbt_reg_write_1(lcd, JBT_REG_GAMMA1_BLUE_OFFSET, 0x00, &ret); 227 228 jbt_reg_write_2(lcd, JBT_REG_HCLOCK_VGA, 0x1f0, &ret); 229 jbt_reg_write_1(lcd, JBT_REG_BLANK_CONTROL, 0x02, &ret); 230 jbt_reg_write_2(lcd, JBT_REG_BLANK_TH_TV, 0x0804, &ret); 231 232 jbt_reg_write_1(lcd, JBT_REG_CKV_ON_OFF, 0x01, &ret); 233 jbt_reg_write_2(lcd, JBT_REG_CKV_1_2, 0x0000, &ret); 234 235 jbt_reg_write_2(lcd, JBT_REG_OEV_TIMING, 0x0d0e, &ret); 236 jbt_reg_write_2(lcd, JBT_REG_ASW_TIMING_1, 0x11a4, &ret); 237 jbt_reg_write_1(lcd, JBT_REG_ASW_TIMING_2, 0x0e, &ret); 238 239 return ret; 240 } 241 242 static int td028ttec1_enable(struct drm_panel *panel) 243 { 244 struct td028ttec1_panel *lcd = to_td028ttec1_device(panel); 245 246 return jbt_ret_write_0(lcd, JBT_REG_DISPLAY_ON, NULL); 247 } 248 249 static int td028ttec1_disable(struct drm_panel *panel) 250 { 251 struct td028ttec1_panel *lcd = to_td028ttec1_device(panel); 252 253 jbt_ret_write_0(lcd, JBT_REG_DISPLAY_OFF, NULL); 254 255 return 0; 256 } 257 258 static int td028ttec1_unprepare(struct drm_panel *panel) 259 { 260 struct td028ttec1_panel *lcd = to_td028ttec1_device(panel); 261 262 jbt_reg_write_2(lcd, JBT_REG_OUTPUT_CONTROL, 0x8002, NULL); 263 jbt_ret_write_0(lcd, JBT_REG_SLEEP_IN, NULL); 264 jbt_reg_write_1(lcd, JBT_REG_POWER_ON_OFF, 0x00, NULL); 265 266 return 0; 267 } 268 269 static const struct drm_display_mode td028ttec1_mode = { 270 .clock = 22153, 271 .hdisplay = 480, 272 .hsync_start = 480 + 24, 273 .hsync_end = 480 + 24 + 8, 274 .htotal = 480 + 24 + 8 + 8, 275 .vdisplay = 640, 276 .vsync_start = 640 + 4, 277 .vsync_end = 640 + 4 + 2, 278 .vtotal = 640 + 4 + 2 + 2, 279 .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED, 280 .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC, 281 .width_mm = 43, 282 .height_mm = 58, 283 }; 284 285 static int td028ttec1_get_modes(struct drm_panel *panel, 286 struct drm_connector *connector) 287 { 288 struct drm_display_mode *mode; 289 290 mode = drm_mode_duplicate(connector->dev, &td028ttec1_mode); 291 if (!mode) 292 return -ENOMEM; 293 294 drm_mode_set_name(mode); 295 drm_mode_probed_add(connector, mode); 296 297 connector->display_info.width_mm = td028ttec1_mode.width_mm; 298 connector->display_info.height_mm = td028ttec1_mode.height_mm; 299 /* 300 * FIXME: According to the datasheet sync signals are sampled on the 301 * rising edge of the clock, but the code running on the OpenMoko Neo 302 * FreeRunner and Neo 1973 indicates sampling on the falling edge. This 303 * should be tested on a real device. 304 */ 305 connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH 306 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE 307 | DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE; 308 309 return 1; 310 } 311 312 static const struct drm_panel_funcs td028ttec1_funcs = { 313 .prepare = td028ttec1_prepare, 314 .enable = td028ttec1_enable, 315 .disable = td028ttec1_disable, 316 .unprepare = td028ttec1_unprepare, 317 .get_modes = td028ttec1_get_modes, 318 }; 319 320 static int td028ttec1_probe(struct spi_device *spi) 321 { 322 struct td028ttec1_panel *lcd; 323 int ret; 324 325 lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL); 326 if (!lcd) 327 return -ENOMEM; 328 329 spi_set_drvdata(spi, lcd); 330 lcd->spi = spi; 331 332 spi->mode = SPI_MODE_3; 333 spi->bits_per_word = 9; 334 335 ret = spi_setup(spi); 336 if (ret < 0) { 337 dev_err(&spi->dev, "failed to setup SPI: %d\n", ret); 338 return ret; 339 } 340 341 drm_panel_init(&lcd->panel, &lcd->spi->dev, &td028ttec1_funcs, 342 DRM_MODE_CONNECTOR_DPI); 343 344 ret = drm_panel_of_backlight(&lcd->panel); 345 if (ret) 346 return ret; 347 348 drm_panel_add(&lcd->panel); 349 350 return 0; 351 } 352 353 static void td028ttec1_remove(struct spi_device *spi) 354 { 355 struct td028ttec1_panel *lcd = spi_get_drvdata(spi); 356 357 drm_panel_remove(&lcd->panel); 358 drm_panel_disable(&lcd->panel); 359 drm_panel_unprepare(&lcd->panel); 360 } 361 362 static const struct of_device_id td028ttec1_of_match[] = { 363 { .compatible = "tpo,td028ttec1", }, 364 /* DT backward compatibility. */ 365 { .compatible = "toppoly,td028ttec1", }, 366 { /* sentinel */ }, 367 }; 368 369 MODULE_DEVICE_TABLE(of, td028ttec1_of_match); 370 371 static const struct spi_device_id td028ttec1_ids[] = { 372 { "td028ttec1", 0 }, 373 { /* sentinel */ } 374 }; 375 376 MODULE_DEVICE_TABLE(spi, td028ttec1_ids); 377 378 static struct spi_driver td028ttec1_driver = { 379 .probe = td028ttec1_probe, 380 .remove = td028ttec1_remove, 381 .id_table = td028ttec1_ids, 382 .driver = { 383 .name = "panel-tpo-td028ttec1", 384 .of_match_table = td028ttec1_of_match, 385 }, 386 }; 387 388 module_spi_driver(td028ttec1_driver); 389 390 MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>"); 391 MODULE_DESCRIPTION("Toppoly TD028TTEC1 panel driver"); 392 MODULE_LICENSE("GPL"); 393