/*
* 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 dce_get_16_bit_backlight_from_pwm(struct panel_cntl *panel_cntl)
{
uint64_t current_backlight;
uint32_t bl_period, bl_int_count;
uint32_t bl_pwm, fractional_duty_cycle_en;
uint32_t bl_period_mask, bl_pwm_mask;
struct dce_panel_cntl *dce_panel_cntl = TO_DCE_PANEL_CNTL(panel_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);
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 = (uint64_t)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;
return (uint32_t)(current_backlight);
}
static 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 (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 if ((value != 0) && (value != 1)) {
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);
} else {
/* TODO: Note: This should not really happen since VBIOS
* should have initialized PWM registers on boot.
*/
REG_WRITE(BL_PWM_CNTL, 0x8000FA00);
REG_WRITE(BL_PWM_PERIOD_CNTL, 0x000C0FA0);
}
// 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 = dce_get_16_bit_backlight_from_pwm(panel_cntl);
return current_backlight;
}
static 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 blon, blon_ovrd, pwrseq_target_state;
REG_GET_2(PWRSEQ_CNTL, LVTMA_BLON, &blon, LVTMA_BLON_OVRD, &blon_ovrd);
REG_GET(PWRSEQ_CNTL, LVTMA_PWRSEQ_TARGET_STATE, &pwrseq_target_state);
if (blon_ovrd)
return blon;
else
return pwrseq_target_state;
}
static 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);
}
static 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);
}
static 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 * (uint64_t)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,
.get_current_backlight = dce_get_16_bit_backlight_from_pwm,
};
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;
dce_panel_cntl->base.pwrseq_inst = 0;
}
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