diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dce/dce_panel_cntl.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dce/dce_panel_cntl.c | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_panel_cntl.c b/drivers/gpu/drm/amd/display/dc/dce/dce_panel_cntl.c new file mode 100644 index 000000000000..ebff9b1e312e --- /dev/null +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_panel_cntl.c @@ -0,0 +1,299 @@ +/* + * Copyright 2012-15 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: AMD + * + */ + +#include "reg_helper.h" +#include "core_types.h" +#include "dc_dmub_srv.h" +#include "panel_cntl.h" +#include "dce_panel_cntl.h" +#include "atom.h" + +#define TO_DCE_PANEL_CNTL(panel_cntl)\ + container_of(panel_cntl, struct dce_panel_cntl, base) + +#define CTX \ + dce_panel_cntl->base.ctx + +#define DC_LOGGER \ + dce_panel_cntl->base.ctx->logger + +#define REG(reg)\ + dce_panel_cntl->regs->reg + +#undef FN +#define FN(reg_name, field_name) \ + dce_panel_cntl->shift->field_name, dce_panel_cntl->mask->field_name + +static unsigned int calculate_16_bit_backlight_from_pwm(struct dce_panel_cntl *dce_panel_cntl) +{ + uint64_t current_backlight; + uint32_t round_result; + uint32_t pwm_period_cntl, bl_period, bl_int_count; + uint32_t bl_pwm_cntl, bl_pwm, fractional_duty_cycle_en; + uint32_t bl_period_mask, bl_pwm_mask; + + pwm_period_cntl = REG_READ(BL_PWM_PERIOD_CNTL); + REG_GET(BL_PWM_PERIOD_CNTL, BL_PWM_PERIOD, &bl_period); + REG_GET(BL_PWM_PERIOD_CNTL, BL_PWM_PERIOD_BITCNT, &bl_int_count); + + bl_pwm_cntl = REG_READ(BL_PWM_CNTL); + REG_GET(BL_PWM_CNTL, BL_ACTIVE_INT_FRAC_CNT, (uint32_t *)(&bl_pwm)); + REG_GET(BL_PWM_CNTL, BL_PWM_FRACTIONAL_EN, &fractional_duty_cycle_en); + + if (bl_int_count == 0) + bl_int_count = 16; + + bl_period_mask = (1 << bl_int_count) - 1; + bl_period &= bl_period_mask; + + bl_pwm_mask = bl_period_mask << (16 - bl_int_count); + + if (fractional_duty_cycle_en == 0) + bl_pwm &= bl_pwm_mask; + else + bl_pwm &= 0xFFFF; + + current_backlight = bl_pwm << (1 + bl_int_count); + + if (bl_period == 0) + bl_period = 0xFFFF; + + current_backlight = div_u64(current_backlight, bl_period); + current_backlight = (current_backlight + 1) >> 1; + + current_backlight = (uint64_t)(current_backlight) * bl_period; + + round_result = (uint32_t)(current_backlight & 0xFFFFFFFF); + + round_result = (round_result >> (bl_int_count-1)) & 1; + + current_backlight >>= bl_int_count; + current_backlight += round_result; + + return (uint32_t)(current_backlight); +} + +uint32_t dce_panel_cntl_hw_init(struct panel_cntl *panel_cntl) +{ + struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl); + uint32_t value; + uint32_t current_backlight; + + /* It must not be 0, so we have to restore them + * Bios bug w/a - period resets to zero, + * restoring to cache values which is always correct + */ + REG_GET(BL_PWM_CNTL, BL_ACTIVE_INT_FRAC_CNT, &value); + + if (value == 0 || value == 1) { + if (panel_cntl->stored_backlight_registers.BL_PWM_CNTL != 0) { + REG_WRITE(BL_PWM_CNTL, + panel_cntl->stored_backlight_registers.BL_PWM_CNTL); + REG_WRITE(BL_PWM_CNTL2, + panel_cntl->stored_backlight_registers.BL_PWM_CNTL2); + REG_WRITE(BL_PWM_PERIOD_CNTL, + panel_cntl->stored_backlight_registers.BL_PWM_PERIOD_CNTL); + REG_UPDATE(PWRSEQ_REF_DIV, + BL_PWM_REF_DIV, + panel_cntl->stored_backlight_registers.LVTMA_PWRSEQ_REF_DIV_BL_PWM_REF_DIV); + } else { + /* TODO: Note: This should not really happen since VBIOS + * should have initialized PWM registers on boot. + */ + REG_WRITE(BL_PWM_CNTL, 0xC000FA00); + REG_WRITE(BL_PWM_PERIOD_CNTL, 0x000C0FA0); + } + } else { + panel_cntl->stored_backlight_registers.BL_PWM_CNTL = + REG_READ(BL_PWM_CNTL); + panel_cntl->stored_backlight_registers.BL_PWM_CNTL2 = + REG_READ(BL_PWM_CNTL2); + panel_cntl->stored_backlight_registers.BL_PWM_PERIOD_CNTL = + REG_READ(BL_PWM_PERIOD_CNTL); + + REG_GET(PWRSEQ_REF_DIV, BL_PWM_REF_DIV, + &panel_cntl->stored_backlight_registers.LVTMA_PWRSEQ_REF_DIV_BL_PWM_REF_DIV); + } + + // Have driver take backlight control + // TakeBacklightControl(true) + value = REG_READ(BIOS_SCRATCH_2); + value |= ATOM_S2_VRI_BRIGHT_ENABLE; + REG_WRITE(BIOS_SCRATCH_2, value); + + // Enable the backlight output + REG_UPDATE(BL_PWM_CNTL, BL_PWM_EN, 1); + + // Unlock group 2 backlight registers + REG_UPDATE(BL_PWM_GRP1_REG_LOCK, + BL_PWM_GRP1_REG_LOCK, 0); + + current_backlight = calculate_16_bit_backlight_from_pwm(dce_panel_cntl); + + return current_backlight; +} + +bool dce_is_panel_backlight_on(struct panel_cntl *panel_cntl) +{ + struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl); + uint32_t value; + + REG_GET(PWRSEQ_CNTL, LVTMA_BLON, &value); + + return value; +} + +bool dce_is_panel_powered_on(struct panel_cntl *panel_cntl) +{ + struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl); + uint32_t pwr_seq_state, dig_on, dig_on_ovrd; + + REG_GET(PWRSEQ_STATE, LVTMA_PWRSEQ_TARGET_STATE_R, &pwr_seq_state); + + REG_GET_2(PWRSEQ_CNTL, LVTMA_DIGON, &dig_on, LVTMA_DIGON_OVRD, &dig_on_ovrd); + + return (pwr_seq_state == 1) || (dig_on == 1 && dig_on_ovrd == 1); +} + +void dce_store_backlight_level(struct panel_cntl *panel_cntl) +{ + struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl); + + panel_cntl->stored_backlight_registers.BL_PWM_CNTL = + REG_READ(BL_PWM_CNTL); + panel_cntl->stored_backlight_registers.BL_PWM_CNTL2 = + REG_READ(BL_PWM_CNTL2); + panel_cntl->stored_backlight_registers.BL_PWM_PERIOD_CNTL = + REG_READ(BL_PWM_PERIOD_CNTL); + + REG_GET(PWRSEQ_REF_DIV, BL_PWM_REF_DIV, + &panel_cntl->stored_backlight_registers.LVTMA_PWRSEQ_REF_DIV_BL_PWM_REF_DIV); +} + +void dce_driver_set_backlight(struct panel_cntl *panel_cntl, + uint32_t backlight_pwm_u16_16) +{ + uint32_t backlight_16bit; + uint32_t masked_pwm_period; + uint8_t bit_count; + uint64_t active_duty_cycle; + uint32_t pwm_period_bitcnt; + struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_cntl); + + /* + * 1. Find 16 bit backlight active duty cycle, where 0 <= backlight + * active duty cycle <= backlight period + */ + + /* 1.1 Apply bitmask for backlight period value based on value of BITCNT + */ + REG_GET_2(BL_PWM_PERIOD_CNTL, + BL_PWM_PERIOD_BITCNT, &pwm_period_bitcnt, + BL_PWM_PERIOD, &masked_pwm_period); + + if (pwm_period_bitcnt == 0) + bit_count = 16; + else + bit_count = pwm_period_bitcnt; + + /* e.g. maskedPwmPeriod = 0x24 when bitCount is 6 */ + masked_pwm_period = masked_pwm_period & ((1 << bit_count) - 1); + + /* 1.2 Calculate integer active duty cycle required upper 16 bits + * contain integer component, lower 16 bits contain fractional component + * of active duty cycle e.g. 0x21BDC0 = 0xEFF0 * 0x24 + */ + active_duty_cycle = backlight_pwm_u16_16 * masked_pwm_period; + + /* 1.3 Calculate 16 bit active duty cycle from integer and fractional + * components shift by bitCount then mask 16 bits and add rounding bit + * from MSB of fraction e.g. 0x86F7 = ((0x21BDC0 >> 6) & 0xFFF) + 0 + */ + backlight_16bit = active_duty_cycle >> bit_count; + backlight_16bit &= 0xFFFF; + backlight_16bit += (active_duty_cycle >> (bit_count - 1)) & 0x1; + + /* + * 2. Program register with updated value + */ + + /* 2.1 Lock group 2 backlight registers */ + + REG_UPDATE_2(BL_PWM_GRP1_REG_LOCK, + BL_PWM_GRP1_IGNORE_MASTER_LOCK_EN, 1, + BL_PWM_GRP1_REG_LOCK, 1); + + // 2.2 Write new active duty cycle + REG_UPDATE(BL_PWM_CNTL, BL_ACTIVE_INT_FRAC_CNT, backlight_16bit); + + /* 2.3 Unlock group 2 backlight registers */ + REG_UPDATE(BL_PWM_GRP1_REG_LOCK, + BL_PWM_GRP1_REG_LOCK, 0); + + /* 3 Wait for pending bit to be cleared */ + REG_WAIT(BL_PWM_GRP1_REG_LOCK, + BL_PWM_GRP1_REG_UPDATE_PENDING, 0, + 1, 10000); +} + +static void dce_panel_cntl_destroy(struct panel_cntl **panel_cntl) +{ + struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(*panel_cntl); + + kfree(dce_panel_cntl); + *panel_cntl = NULL; +} + +static const struct panel_cntl_funcs dce_link_panel_cntl_funcs = { + .destroy = dce_panel_cntl_destroy, + .hw_init = dce_panel_cntl_hw_init, + .is_panel_backlight_on = dce_is_panel_backlight_on, + .is_panel_powered_on = dce_is_panel_powered_on, + .store_backlight_level = dce_store_backlight_level, + .driver_set_backlight = dce_driver_set_backlight, +}; + +void dce_panel_cntl_construct( + struct dce_panel_cntl *dce_panel_cntl, + const struct panel_cntl_init_data *init_data, + const struct dce_panel_cntl_registers *regs, + const struct dce_panel_cntl_shift *shift, + const struct dce_panel_cntl_mask *mask) +{ + struct panel_cntl *base = &dce_panel_cntl->base; + + base->stored_backlight_registers.BL_PWM_CNTL = 0; + base->stored_backlight_registers.BL_PWM_CNTL2 = 0; + base->stored_backlight_registers.BL_PWM_PERIOD_CNTL = 0; + base->stored_backlight_registers.LVTMA_PWRSEQ_REF_DIV_BL_PWM_REF_DIV = 0; + + dce_panel_cntl->regs = regs; + dce_panel_cntl->shift = shift; + dce_panel_cntl->mask = mask; + + dce_panel_cntl->base.funcs = &dce_link_panel_cntl_funcs; + dce_panel_cntl->base.ctx = init_data->ctx; + dce_panel_cntl->base.inst = init_data->inst; +} |