1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Backlight code for ATI Radeon based graphic cards 4 * 5 * Copyright (c) 2000 Ani Joshi <ajoshi@kernel.crashing.org> 6 * Copyright (c) 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org> 7 * Copyright (c) 2006 Michael Hanselmann <linux-kernel@hansmi.ch> 8 */ 9 10 #include "radeonfb.h" 11 #include <linux/backlight.h> 12 #include <linux/slab.h> 13 14 #ifdef CONFIG_PMAC_BACKLIGHT 15 #include <asm/backlight.h> 16 #endif 17 18 #define MAX_RADEON_LEVEL 0xFF 19 20 struct radeon_bl_privdata { 21 struct radeonfb_info *rinfo; 22 uint8_t negative; 23 }; 24 25 static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata, 26 int level) 27 { 28 int rlevel; 29 30 /* Get and convert the value */ 31 /* No locking of bl_curve since we read a single value */ 32 rlevel = pdata->rinfo->info->bl_curve[level] * 33 FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL; 34 35 if (rlevel < 0) 36 rlevel = 0; 37 else if (rlevel > MAX_RADEON_LEVEL) 38 rlevel = MAX_RADEON_LEVEL; 39 40 if (pdata->negative) 41 rlevel = MAX_RADEON_LEVEL - rlevel; 42 43 return rlevel; 44 } 45 46 static int radeon_bl_update_status(struct backlight_device *bd) 47 { 48 struct radeon_bl_privdata *pdata = bl_get_data(bd); 49 struct radeonfb_info *rinfo = pdata->rinfo; 50 u32 lvds_gen_cntl, tmpPixclksCntl; 51 int level; 52 53 if (rinfo->mon1_type != MT_LCD) 54 return 0; 55 56 /* We turn off the LCD completely instead of just dimming the 57 * backlight. This provides some greater power saving and the display 58 * is useless without backlight anyway. 59 */ 60 if (bd->props.power != FB_BLANK_UNBLANK || 61 bd->props.fb_blank != FB_BLANK_UNBLANK) 62 level = 0; 63 else 64 level = bd->props.brightness; 65 66 del_timer_sync(&rinfo->lvds_timer); 67 radeon_engine_idle(); 68 69 lvds_gen_cntl = INREG(LVDS_GEN_CNTL); 70 if (level > 0) { 71 lvds_gen_cntl &= ~LVDS_DISPLAY_DIS; 72 if (!(lvds_gen_cntl & LVDS_BLON) || !(lvds_gen_cntl & LVDS_ON)) { 73 lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_DIGON); 74 lvds_gen_cntl |= LVDS_BLON | LVDS_EN; 75 OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); 76 lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK; 77 lvds_gen_cntl |= 78 (radeon_bl_get_level_brightness(pdata, level) << 79 LVDS_BL_MOD_LEVEL_SHIFT); 80 lvds_gen_cntl |= LVDS_ON; 81 lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_BL_MOD_EN); 82 rinfo->pending_lvds_gen_cntl = lvds_gen_cntl; 83 mod_timer(&rinfo->lvds_timer, 84 jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay)); 85 } else { 86 lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK; 87 lvds_gen_cntl |= 88 (radeon_bl_get_level_brightness(pdata, level) << 89 LVDS_BL_MOD_LEVEL_SHIFT); 90 OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); 91 } 92 rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK; 93 rinfo->init_state.lvds_gen_cntl |= rinfo->pending_lvds_gen_cntl 94 & LVDS_STATE_MASK; 95 } else { 96 /* Asic bug, when turning off LVDS_ON, we have to make sure 97 RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off 98 */ 99 tmpPixclksCntl = INPLL(PIXCLKS_CNTL); 100 if (rinfo->is_mobility || rinfo->is_IGP) 101 OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb); 102 lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN); 103 lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, 0) << 104 LVDS_BL_MOD_LEVEL_SHIFT); 105 lvds_gen_cntl |= LVDS_DISPLAY_DIS; 106 OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); 107 udelay(100); 108 lvds_gen_cntl &= ~(LVDS_ON | LVDS_EN); 109 OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); 110 lvds_gen_cntl &= ~(LVDS_DIGON); 111 rinfo->pending_lvds_gen_cntl = lvds_gen_cntl; 112 mod_timer(&rinfo->lvds_timer, 113 jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay)); 114 if (rinfo->is_mobility || rinfo->is_IGP) 115 OUTPLL(PIXCLKS_CNTL, tmpPixclksCntl); 116 } 117 rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK; 118 rinfo->init_state.lvds_gen_cntl |= (lvds_gen_cntl & LVDS_STATE_MASK); 119 120 return 0; 121 } 122 123 static const struct backlight_ops radeon_bl_data = { 124 .update_status = radeon_bl_update_status, 125 }; 126 127 void radeonfb_bl_init(struct radeonfb_info *rinfo) 128 { 129 struct backlight_properties props; 130 struct backlight_device *bd; 131 struct radeon_bl_privdata *pdata; 132 char name[12]; 133 134 if (rinfo->mon1_type != MT_LCD) 135 return; 136 137 #ifdef CONFIG_PMAC_BACKLIGHT 138 if (!pmac_has_backlight_type("ati") && 139 !pmac_has_backlight_type("mnca")) 140 return; 141 #endif 142 143 pdata = kmalloc(sizeof(struct radeon_bl_privdata), GFP_KERNEL); 144 if (!pdata) { 145 printk("radeonfb: Memory allocation failed\n"); 146 goto error; 147 } 148 149 snprintf(name, sizeof(name), "radeonbl%d", rinfo->info->node); 150 151 memset(&props, 0, sizeof(struct backlight_properties)); 152 props.type = BACKLIGHT_RAW; 153 props.max_brightness = FB_BACKLIGHT_LEVELS - 1; 154 bd = backlight_device_register(name, rinfo->info->dev, pdata, 155 &radeon_bl_data, &props); 156 if (IS_ERR(bd)) { 157 rinfo->info->bl_dev = NULL; 158 printk("radeonfb: Backlight registration failed\n"); 159 goto error; 160 } 161 162 pdata->rinfo = rinfo; 163 164 /* Pardon me for that hack... maybe some day we can figure out in what 165 * direction backlight should work on a given panel? 166 */ 167 pdata->negative = 168 (rinfo->family != CHIP_FAMILY_RV200 && 169 rinfo->family != CHIP_FAMILY_RV250 && 170 rinfo->family != CHIP_FAMILY_RV280 && 171 rinfo->family != CHIP_FAMILY_RV350); 172 173 #ifdef CONFIG_PMAC_BACKLIGHT 174 pdata->negative = pdata->negative || 175 of_machine_is_compatible("PowerBook4,3") || 176 of_machine_is_compatible("PowerBook6,3") || 177 of_machine_is_compatible("PowerBook6,5"); 178 #endif 179 180 rinfo->info->bl_dev = bd; 181 fb_bl_default_curve(rinfo->info, 0, 182 63 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL, 183 217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL); 184 185 bd->props.brightness = bd->props.max_brightness; 186 bd->props.power = FB_BLANK_UNBLANK; 187 backlight_update_status(bd); 188 189 printk("radeonfb: Backlight initialized (%s)\n", name); 190 191 return; 192 193 error: 194 kfree(pdata); 195 return; 196 } 197 198 void radeonfb_bl_exit(struct radeonfb_info *rinfo) 199 { 200 struct backlight_device *bd = rinfo->info->bl_dev; 201 202 if (bd) { 203 struct radeon_bl_privdata *pdata; 204 205 pdata = bl_get_data(bd); 206 backlight_device_unregister(bd); 207 kfree(pdata); 208 rinfo->info->bl_dev = NULL; 209 210 printk("radeonfb: Backlight unloaded\n"); 211 } 212 } 213