drivers/gpu/drm/amd/display/dc/dce/dce_panel_cntl.c

   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 round_result;
  53         uint32_t pwm_period_cntl, bl_period, bl_int_count;
  54         uint32_t bl_pwm_cntl, bl_pwm, fractional_duty_cycle_en;
  55         uint32_t bl_period_mask, bl_pwm_mask;
  56         struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl);
  57
  58         pwm_period_cntl = REG_READ(BL_PWM_PERIOD_CNTL);
  59         REG_GET(BL_PWM_PERIOD_CNTL, BL_PWM_PERIOD, &bl_period);
  60         REG_GET(BL_PWM_PERIOD_CNTL, BL_PWM_PERIOD_BITCNT, &bl_int_count);
  61
  62         bl_pwm_cntl = REG_READ(BL_PWM_CNTL);
  63         REG_GET(BL_PWM_CNTL, BL_ACTIVE_INT_FRAC_CNT, (uint32_t *)(&bl_pwm));
  64         REG_GET(BL_PWM_CNTL, BL_PWM_FRACTIONAL_EN, &fractional_duty_cycle_en);
  65
  66         if (bl_int_count == 0)
  67                 bl_int_count = 16;
  68
  69         bl_period_mask = (1 << bl_int_count) - 1;
  70         bl_period &= bl_period_mask;
  71
  72         bl_pwm_mask = bl_period_mask << (16 - bl_int_count);
  73
  74         if (fractional_duty_cycle_en == 0)
  75                 bl_pwm &= bl_pwm_mask;
  76         else
  77                 bl_pwm &= 0xFFFF;
  78
  79         current_backlight = bl_pwm << (1 + bl_int_count);
  80
  81         if (bl_period == 0)
  82                 bl_period = 0xFFFF;
  83
  84         current_backlight = div_u64(current_backlight, bl_period);
  85         current_backlight = (current_backlight + 1) >> 1;
  86
  87         current_backlight = (uint64_t)(current_backlight) * bl_period;
  88
  89         round_result = (uint32_t)(current_backlight & 0xFFFFFFFF);
  90
  91         round_result = (round_result >> (bl_int_count-1)) & 1;
  92
  93         current_backlight >>= bl_int_count;
  94         current_backlight += round_result;
  95
  96         return (uint32_t)(current_backlight);
  97 }
  98
  99 static uint32_t dce_panel_cntl_hw_init(struct panel_cntl *panel_cntl)
 100 {
 101         struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl);
 102         uint32_t value;
 103         uint32_t current_backlight;
 104
 105         /* It must not be 0, so we have to restore them
 106          * Bios bug w/a - period resets to zero,
 107          * restoring to cache values which is always correct
 108          */
 109         REG_GET(BL_PWM_CNTL, BL_ACTIVE_INT_FRAC_CNT, &value);
 110
 111         if (value == 0 || value == 1) {
 112                 if (panel_cntl->stored_backlight_registers.BL_PWM_CNTL != 0) {
 113                         REG_WRITE(BL_PWM_CNTL,
 114                                         panel_cntl->stored_backlight_registers.BL_PWM_CNTL);
 115                         REG_WRITE(BL_PWM_CNTL2,
 116                                         panel_cntl->stored_backlight_registers.BL_PWM_CNTL2);
 117                         REG_WRITE(BL_PWM_PERIOD_CNTL,
 118                                         panel_cntl->stored_backlight_registers.BL_PWM_PERIOD_CNTL);
 119                         REG_UPDATE(PWRSEQ_REF_DIV,
 120                                 BL_PWM_REF_DIV,
 121                                 panel_cntl->stored_backlight_registers.LVTMA_PWRSEQ_REF_DIV_BL_PWM_REF_DIV);
 122                 } else {
 123                         /* TODO: Note: This should not really happen since VBIOS
 124                          * should have initialized PWM registers on boot.
 125                          */
 126                         REG_WRITE(BL_PWM_CNTL, 0xC000FA00);
 127                         REG_WRITE(BL_PWM_PERIOD_CNTL, 0x000C0FA0);
 128                 }
 129         } else {
 130                 panel_cntl->stored_backlight_registers.BL_PWM_CNTL =
 131                                 REG_READ(BL_PWM_CNTL);
 132                 panel_cntl->stored_backlight_registers.BL_PWM_CNTL2 =
 133                                 REG_READ(BL_PWM_CNTL2);
 134                 panel_cntl->stored_backlight_registers.BL_PWM_PERIOD_CNTL =
 135                                 REG_READ(BL_PWM_PERIOD_CNTL);
 136
 137                 REG_GET(PWRSEQ_REF_DIV, BL_PWM_REF_DIV,
 138                                 &panel_cntl->stored_backlight_registers.LVTMA_PWRSEQ_REF_DIV_BL_PWM_REF_DIV);
 139         }
 140
 141         // Have driver take backlight control
 142         // TakeBacklightControl(true)
 143         value = REG_READ(BIOS_SCRATCH_2);
 144         value |= ATOM_S2_VRI_BRIGHT_ENABLE;
 145         REG_WRITE(BIOS_SCRATCH_2, value);
 146
 147         // Enable the backlight output
 148         REG_UPDATE(BL_PWM_CNTL, BL_PWM_EN, 1);
 149
 150         // Unlock group 2 backlight registers
 151         REG_UPDATE(BL_PWM_GRP1_REG_LOCK,
 152                         BL_PWM_GRP1_REG_LOCK, 0);
 153
 154         current_backlight = dce_get_16_bit_backlight_from_pwm(panel_cntl);
 155
 156         return current_backlight;
 157 }
 158
 159 static bool dce_is_panel_backlight_on(struct panel_cntl *panel_cntl)
 160 {
 161         struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl);
 162         uint32_t value;
 163
 164         REG_GET(PWRSEQ_CNTL, LVTMA_BLON, &value);
 165
 166         return value;
 167 }
 168
 169 static bool dce_is_panel_powered_on(struct panel_cntl *panel_cntl)
 170 {
 171         struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl);
 172         uint32_t pwr_seq_state, dig_on, dig_on_ovrd;
 173
 174         REG_GET(PWRSEQ_STATE, LVTMA_PWRSEQ_TARGET_STATE_R, &pwr_seq_state);
 175
 176         REG_GET_2(PWRSEQ_CNTL, LVTMA_DIGON, &dig_on, LVTMA_DIGON_OVRD, &dig_on_ovrd);
 177
 178         return (pwr_seq_state == 1) || (dig_on == 1 && dig_on_ovrd == 1);
 179 }
 180
 181 static void dce_store_backlight_level(struct panel_cntl *panel_cntl)
 182 {
 183         struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl);
 184
 185         panel_cntl->stored_backlight_registers.BL_PWM_CNTL =
 186                 REG_READ(BL_PWM_CNTL);
 187         panel_cntl->stored_backlight_registers.BL_PWM_CNTL2 =
 188                 REG_READ(BL_PWM_CNTL2);
 189         panel_cntl->stored_backlight_registers.BL_PWM_PERIOD_CNTL =
 190                 REG_READ(BL_PWM_PERIOD_CNTL);
 191
 192         REG_GET(PWRSEQ_REF_DIV, BL_PWM_REF_DIV,
 193                 &panel_cntl->stored_backlight_registers.LVTMA_PWRSEQ_REF_DIV_BL_PWM_REF_DIV);
 194 }
 195
 196 static void dce_driver_set_backlight(struct panel_cntl *panel_cntl,
 197                 uint32_t backlight_pwm_u16_16)
 198 {
 199         uint32_t backlight_16bit;
 200         uint32_t masked_pwm_period;
 201         uint8_t bit_count;
 202         uint64_t active_duty_cycle;
 203         uint32_t pwm_period_bitcnt;
 204         struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl);
 205
 206         /*
 207          * 1. Find  16 bit backlight active duty cycle, where 0 <= backlight
 208          * active duty cycle <= backlight period
 209          */
 210
 211         /* 1.1 Apply bitmask for backlight period value based on value of BITCNT
 212          */
 213         REG_GET_2(BL_PWM_PERIOD_CNTL,
 214                         BL_PWM_PERIOD_BITCNT, &pwm_period_bitcnt,
 215                         BL_PWM_PERIOD, &masked_pwm_period);
 216
 217         if (pwm_period_bitcnt == 0)
 218                 bit_count = 16;
 219         else
 220                 bit_count = pwm_period_bitcnt;
 221
 222         /* e.g. maskedPwmPeriod = 0x24 when bitCount is 6 */
 223         masked_pwm_period = masked_pwm_period & ((1 << bit_count) - 1);
 224
 225         /* 1.2 Calculate integer active duty cycle required upper 16 bits
 226          * contain integer component, lower 16 bits contain fractional component
 227          * of active duty cycle e.g. 0x21BDC0 = 0xEFF0 * 0x24
 228          */
 229         active_duty_cycle = backlight_pwm_u16_16 * masked_pwm_period;
 230
 231         /* 1.3 Calculate 16 bit active duty cycle from integer and fractional
 232          * components shift by bitCount then mask 16 bits and add rounding bit
 233          * from MSB of fraction e.g. 0x86F7 = ((0x21BDC0 >> 6) & 0xFFF) + 0
 234          */
 235         backlight_16bit = active_duty_cycle >> bit_count;
 236         backlight_16bit &= 0xFFFF;
 237         backlight_16bit += (active_duty_cycle >> (bit_count - 1)) & 0x1;
 238
 239         /*
 240          * 2. Program register with updated value
 241          */
 242
 243         /* 2.1 Lock group 2 backlight registers */
 244
 245         REG_UPDATE_2(BL_PWM_GRP1_REG_LOCK,
 246                         BL_PWM_GRP1_IGNORE_MASTER_LOCK_EN, 1,
 247                         BL_PWM_GRP1_REG_LOCK, 1);
 248
 249         // 2.2 Write new active duty cycle
 250         REG_UPDATE(BL_PWM_CNTL, BL_ACTIVE_INT_FRAC_CNT, backlight_16bit);
 251
 252         /* 2.3 Unlock group 2 backlight registers */
 253         REG_UPDATE(BL_PWM_GRP1_REG_LOCK,
 254                         BL_PWM_GRP1_REG_LOCK, 0);
 255
 256         /* 3 Wait for pending bit to be cleared */
 257         REG_WAIT(BL_PWM_GRP1_REG_LOCK,
 258                         BL_PWM_GRP1_REG_UPDATE_PENDING, 0,
 259                         1, 10000);
 260 }
 261
 262 static void dce_panel_cntl_destroy(struct panel_cntl **panel_cntl)
 263 {
 264         struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(*panel_cntl);
 265
 266         kfree(dce_panel_cntl);
 267         *panel_cntl = NULL;
 268 }
 269
 270 static const struct panel_cntl_funcs dce_link_panel_cntl_funcs = {
 271         .destroy = dce_panel_cntl_destroy,
 272         .hw_init = dce_panel_cntl_hw_init,
 273         .is_panel_backlight_on = dce_is_panel_backlight_on,
 274         .is_panel_powered_on = dce_is_panel_powered_on,
 275         .store_backlight_level = dce_store_backlight_level,
 276         .driver_set_backlight = dce_driver_set_backlight,
 277         .get_current_backlight = dce_get_16_bit_backlight_from_pwm,
 278 };
 279
 280 void dce_panel_cntl_construct(
 281         struct dce_panel_cntl *dce_panel_cntl,
 282         const struct panel_cntl_init_data *init_data,
 283         const struct dce_panel_cntl_registers *regs,
 284         const struct dce_panel_cntl_shift *shift,
 285         const struct dce_panel_cntl_mask *mask)
 286 {
 287         struct panel_cntl *base = &dce_panel_cntl->base;
 288
 289         base->stored_backlight_registers.BL_PWM_CNTL = 0;
 290         base->stored_backlight_registers.BL_PWM_CNTL2 = 0;
 291         base->stored_backlight_registers.BL_PWM_PERIOD_CNTL = 0;
 292         base->stored_backlight_registers.LVTMA_PWRSEQ_REF_DIV_BL_PWM_REF_DIV = 0;
 293
 294         dce_panel_cntl->regs = regs;
 295         dce_panel_cntl->shift = shift;
 296         dce_panel_cntl->mask = mask;
 297
 298         dce_panel_cntl->base.funcs = &dce_link_panel_cntl_funcs;
 299         dce_panel_cntl->base.ctx = init_data->ctx;
 300         dce_panel_cntl->base.inst = init_data->inst;
 301 }