1 /* 2 * Copyright 2012-15 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: AMD 23 * 24 */ 25 26 #include "reg_helper.h" 27 #include "core_types.h" 28 #include "dc_dmub_srv.h" 29 #include "panel_cntl.h" 30 #include "dce_panel_cntl.h" 31 #include "atom.h" 32 33 #define TO_DCE_PANEL_CNTL(panel_cntl)\ 34 container_of(panel_cntl, struct dce_panel_cntl, base) 35 36 #define CTX \ 37 dce_panel_cntl->base.ctx 38 39 #define DC_LOGGER \ 40 dce_panel_cntl->base.ctx->logger 41 42 #define REG(reg)\ 43 dce_panel_cntl->regs->reg 44 45 #undef FN 46 #define FN(reg_name, field_name) \ 47 dce_panel_cntl->shift->field_name, dce_panel_cntl->mask->field_name 48 49 static unsigned int dce_get_16_bit_backlight_from_pwm(struct panel_cntl *panel_cntl) 50 { 51 uint64_t current_backlight; 52 uint32_t bl_period, bl_int_count; 53 uint32_t bl_pwm, fractional_duty_cycle_en; 54 uint32_t bl_period_mask, bl_pwm_mask; 55 struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl); 56 57 REG_READ(BL_PWM_PERIOD_CNTL); 58 REG_GET(BL_PWM_PERIOD_CNTL, BL_PWM_PERIOD, &bl_period); 59 REG_GET(BL_PWM_PERIOD_CNTL, BL_PWM_PERIOD_BITCNT, &bl_int_count); 60 61 REG_READ(BL_PWM_CNTL); 62 REG_GET(BL_PWM_CNTL, BL_ACTIVE_INT_FRAC_CNT, (uint32_t *)(&bl_pwm)); 63 REG_GET(BL_PWM_CNTL, BL_PWM_FRACTIONAL_EN, &fractional_duty_cycle_en); 64 65 if (bl_int_count == 0) 66 bl_int_count = 16; 67 68 bl_period_mask = (1 << bl_int_count) - 1; 69 bl_period &= bl_period_mask; 70 71 bl_pwm_mask = bl_period_mask << (16 - bl_int_count); 72 73 if (fractional_duty_cycle_en == 0) 74 bl_pwm &= bl_pwm_mask; 75 else 76 bl_pwm &= 0xFFFF; 77 78 current_backlight = (uint64_t)bl_pwm << (1 + bl_int_count); 79 80 if (bl_period == 0) 81 bl_period = 0xFFFF; 82 83 current_backlight = div_u64(current_backlight, bl_period); 84 current_backlight = (current_backlight + 1) >> 1; 85 86 return (uint32_t)(current_backlight); 87 } 88 89 static uint32_t dce_panel_cntl_hw_init(struct panel_cntl *panel_cntl) 90 { 91 struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl); 92 uint32_t value; 93 uint32_t current_backlight; 94 95 /* It must not be 0, so we have to restore them 96 * Bios bug w/a - period resets to zero, 97 * restoring to cache values which is always correct 98 */ 99 REG_GET(BL_PWM_CNTL, BL_ACTIVE_INT_FRAC_CNT, &value); 100 101 if (panel_cntl->stored_backlight_registers.BL_PWM_CNTL != 0) { 102 REG_WRITE(BL_PWM_CNTL, 103 panel_cntl->stored_backlight_registers.BL_PWM_CNTL); 104 REG_WRITE(BL_PWM_CNTL2, 105 panel_cntl->stored_backlight_registers.BL_PWM_CNTL2); 106 REG_WRITE(BL_PWM_PERIOD_CNTL, 107 panel_cntl->stored_backlight_registers.BL_PWM_PERIOD_CNTL); 108 REG_UPDATE(PWRSEQ_REF_DIV, 109 BL_PWM_REF_DIV, 110 panel_cntl->stored_backlight_registers.LVTMA_PWRSEQ_REF_DIV_BL_PWM_REF_DIV); 111 } else if ((value != 0) && (value != 1)) { 112 panel_cntl->stored_backlight_registers.BL_PWM_CNTL = 113 REG_READ(BL_PWM_CNTL); 114 panel_cntl->stored_backlight_registers.BL_PWM_CNTL2 = 115 REG_READ(BL_PWM_CNTL2); 116 panel_cntl->stored_backlight_registers.BL_PWM_PERIOD_CNTL = 117 REG_READ(BL_PWM_PERIOD_CNTL); 118 119 REG_GET(PWRSEQ_REF_DIV, BL_PWM_REF_DIV, 120 &panel_cntl->stored_backlight_registers.LVTMA_PWRSEQ_REF_DIV_BL_PWM_REF_DIV); 121 } else { 122 /* TODO: Note: This should not really happen since VBIOS 123 * should have initialized PWM registers on boot. 124 */ 125 REG_WRITE(BL_PWM_CNTL, 0x8000FA00); 126 REG_WRITE(BL_PWM_PERIOD_CNTL, 0x000C0FA0); 127 } 128 129 // Have driver take backlight control 130 // TakeBacklightControl(true) 131 value = REG_READ(BIOS_SCRATCH_2); 132 value |= ATOM_S2_VRI_BRIGHT_ENABLE; 133 REG_WRITE(BIOS_SCRATCH_2, value); 134 135 // Enable the backlight output 136 REG_UPDATE(BL_PWM_CNTL, BL_PWM_EN, 1); 137 138 // Unlock group 2 backlight registers 139 REG_UPDATE(BL_PWM_GRP1_REG_LOCK, 140 BL_PWM_GRP1_REG_LOCK, 0); 141 142 current_backlight = dce_get_16_bit_backlight_from_pwm(panel_cntl); 143 144 return current_backlight; 145 } 146 147 static bool dce_is_panel_backlight_on(struct panel_cntl *panel_cntl) 148 { 149 struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl); 150 uint32_t blon, blon_ovrd, pwrseq_target_state; 151 152 REG_GET_2(PWRSEQ_CNTL, LVTMA_BLON, &blon, LVTMA_BLON_OVRD, &blon_ovrd); 153 REG_GET(PWRSEQ_CNTL, LVTMA_PWRSEQ_TARGET_STATE, &pwrseq_target_state); 154 155 if (blon_ovrd) 156 return blon; 157 else 158 return pwrseq_target_state; 159 } 160 161 static bool dce_is_panel_powered_on(struct panel_cntl *panel_cntl) 162 { 163 struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl); 164 uint32_t pwr_seq_state, dig_on, dig_on_ovrd; 165 166 REG_GET(PWRSEQ_STATE, LVTMA_PWRSEQ_TARGET_STATE_R, &pwr_seq_state); 167 168 REG_GET_2(PWRSEQ_CNTL, LVTMA_DIGON, &dig_on, LVTMA_DIGON_OVRD, &dig_on_ovrd); 169 170 return (pwr_seq_state == 1) || (dig_on == 1 && dig_on_ovrd == 1); 171 } 172 173 static void dce_store_backlight_level(struct panel_cntl *panel_cntl) 174 { 175 struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl); 176 177 panel_cntl->stored_backlight_registers.BL_PWM_CNTL = 178 REG_READ(BL_PWM_CNTL); 179 panel_cntl->stored_backlight_registers.BL_PWM_CNTL2 = 180 REG_READ(BL_PWM_CNTL2); 181 panel_cntl->stored_backlight_registers.BL_PWM_PERIOD_CNTL = 182 REG_READ(BL_PWM_PERIOD_CNTL); 183 184 REG_GET(PWRSEQ_REF_DIV, BL_PWM_REF_DIV, 185 &panel_cntl->stored_backlight_registers.LVTMA_PWRSEQ_REF_DIV_BL_PWM_REF_DIV); 186 } 187 188 static void dce_driver_set_backlight(struct panel_cntl *panel_cntl, 189 uint32_t backlight_pwm_u16_16) 190 { 191 uint32_t backlight_16bit; 192 uint32_t masked_pwm_period; 193 uint8_t bit_count; 194 uint64_t active_duty_cycle; 195 uint32_t pwm_period_bitcnt; 196 struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl); 197 198 /* 199 * 1. Find 16 bit backlight active duty cycle, where 0 <= backlight 200 * active duty cycle <= backlight period 201 */ 202 203 /* 1.1 Apply bitmask for backlight period value based on value of BITCNT 204 */ 205 REG_GET_2(BL_PWM_PERIOD_CNTL, 206 BL_PWM_PERIOD_BITCNT, &pwm_period_bitcnt, 207 BL_PWM_PERIOD, &masked_pwm_period); 208 209 if (pwm_period_bitcnt == 0) 210 bit_count = 16; 211 else 212 bit_count = pwm_period_bitcnt; 213 214 /* e.g. maskedPwmPeriod = 0x24 when bitCount is 6 */ 215 masked_pwm_period = masked_pwm_period & ((1 << bit_count) - 1); 216 217 /* 1.2 Calculate integer active duty cycle required upper 16 bits 218 * contain integer component, lower 16 bits contain fractional component 219 * of active duty cycle e.g. 0x21BDC0 = 0xEFF0 * 0x24 220 */ 221 active_duty_cycle = backlight_pwm_u16_16 * masked_pwm_period; 222 223 /* 1.3 Calculate 16 bit active duty cycle from integer and fractional 224 * components shift by bitCount then mask 16 bits and add rounding bit 225 * from MSB of fraction e.g. 0x86F7 = ((0x21BDC0 >> 6) & 0xFFF) + 0 226 */ 227 backlight_16bit = active_duty_cycle >> bit_count; 228 backlight_16bit &= 0xFFFF; 229 backlight_16bit += (active_duty_cycle >> (bit_count - 1)) & 0x1; 230 231 /* 232 * 2. Program register with updated value 233 */ 234 235 /* 2.1 Lock group 2 backlight registers */ 236 237 REG_UPDATE_2(BL_PWM_GRP1_REG_LOCK, 238 BL_PWM_GRP1_IGNORE_MASTER_LOCK_EN, 1, 239 BL_PWM_GRP1_REG_LOCK, 1); 240 241 // 2.2 Write new active duty cycle 242 REG_UPDATE(BL_PWM_CNTL, BL_ACTIVE_INT_FRAC_CNT, backlight_16bit); 243 244 /* 2.3 Unlock group 2 backlight registers */ 245 REG_UPDATE(BL_PWM_GRP1_REG_LOCK, 246 BL_PWM_GRP1_REG_LOCK, 0); 247 248 /* 3 Wait for pending bit to be cleared */ 249 REG_WAIT(BL_PWM_GRP1_REG_LOCK, 250 BL_PWM_GRP1_REG_UPDATE_PENDING, 0, 251 1, 10000); 252 } 253 254 static void dce_panel_cntl_destroy(struct panel_cntl **panel_cntl) 255 { 256 struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(*panel_cntl); 257 258 kfree(dce_panel_cntl); 259 *panel_cntl = NULL; 260 } 261 262 static const struct panel_cntl_funcs dce_link_panel_cntl_funcs = { 263 .destroy = dce_panel_cntl_destroy, 264 .hw_init = dce_panel_cntl_hw_init, 265 .is_panel_backlight_on = dce_is_panel_backlight_on, 266 .is_panel_powered_on = dce_is_panel_powered_on, 267 .store_backlight_level = dce_store_backlight_level, 268 .driver_set_backlight = dce_driver_set_backlight, 269 .get_current_backlight = dce_get_16_bit_backlight_from_pwm, 270 }; 271 272 void dce_panel_cntl_construct( 273 struct dce_panel_cntl *dce_panel_cntl, 274 const struct panel_cntl_init_data *init_data, 275 const struct dce_panel_cntl_registers *regs, 276 const struct dce_panel_cntl_shift *shift, 277 const struct dce_panel_cntl_mask *mask) 278 { 279 struct panel_cntl *base = &dce_panel_cntl->base; 280 281 base->stored_backlight_registers.BL_PWM_CNTL = 0; 282 base->stored_backlight_registers.BL_PWM_CNTL2 = 0; 283 base->stored_backlight_registers.BL_PWM_PERIOD_CNTL = 0; 284 base->stored_backlight_registers.LVTMA_PWRSEQ_REF_DIV_BL_PWM_REF_DIV = 0; 285 286 dce_panel_cntl->regs = regs; 287 dce_panel_cntl->shift = shift; 288 dce_panel_cntl->mask = mask; 289 290 dce_panel_cntl->base.funcs = &dce_link_panel_cntl_funcs; 291 dce_panel_cntl->base.ctx = init_data->ctx; 292 dce_panel_cntl->base.inst = init_data->inst; 293 } 294