Commit fe626734 authored by Anthony Koo's avatar Anthony Koo Committed by Alex Deucher
Browse files

drm/amd/display: Implement support for backlight optimization 



- Add functionality to get real hw backlight level as opposed to user
level, meaning the level that takes into account backlight ramping
over time and backlight reduction due to Varibright
- Add backlight optimization which allows for a second OS state
that is able to control ABM

Signed-off-by: default avatarAnthony Koo <Anthony.Koo@amd.com>
Reviewed-by: default avatarAric Cyr <Aric.Cyr@amd.com>
Acked-by: default avatarHarry Wentland <Harry.Wentland@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent c0ba5ec7

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

+11 −2
Original line number Diff line number Diff line
@@ -60,7 +60,7 @@ struct abm_backlight_registers { 
static struct abm_backlight_registers stored_backlight_registers = {0};





static unsigned int get_current_backlight(struct dce_abm *abm_dce)

static unsigned int get_current_backlight_16_bit(struct dce_abm *abm_dce)

{

	uint64_t current_backlight;

	uint32_t round_result;
@@ -252,7 +252,7 @@ static void dmcu_set_backlight_level( 
static void dce_abm_init(struct abm *abm)

{

	struct dce_abm *abm_dce = TO_DCE_ABM(abm);

	unsigned int backlight = get_current_backlight(abm_dce);

	unsigned int backlight = get_current_backlight_16_bit(abm_dce);



	REG_WRITE(DC_ABM1_HG_SAMPLE_RATE, 0x103);

	REG_WRITE(DC_ABM1_HG_SAMPLE_RATE, 0x101);
@@ -289,6 +289,14 @@ static void dce_abm_init(struct abm *abm) 
			ABM1_BL_REG_READ_MISSED_FRAME_CLEAR, 1);

}



static unsigned int dce_abm_get_current_backlight_8_bit(struct abm *abm)

{

	struct dce_abm *abm_dce = TO_DCE_ABM(abm);

	unsigned int backlight = REG_READ(BL1_PWM_CURRENT_ABM_LEVEL);



	return (backlight >> 8);

}



static bool dce_abm_set_level(struct abm *abm, uint32_t level)

{

	struct dce_abm *abm_dce = TO_DCE_ABM(abm);
@@ -405,6 +413,7 @@ static const struct abm_funcs dce_funcs = { 
	.set_abm_level = dce_abm_set_level,

	.init_backlight = dce_abm_init_backlight,

	.set_backlight_level = dce_abm_set_backlight_level,

	.get_current_backlight_8_bit = dce_abm_get_current_backlight_8_bit,

	.is_dmcu_initialized = is_dmcu_initialized

};

drivers/gpu/drm/amd/display/dc/inc/hw/abm.h

+1 −0
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ struct abm_funcs { 
			unsigned int backlight_level,

			unsigned int frame_ramp,

			unsigned int controller_id);

	unsigned int (*get_current_backlight_8_bit)(struct abm *abm);

	bool (*is_dmcu_initialized)(struct abm *abm);

};