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drm/amd/display: Write default Vesa Aux backlight control in dmub

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[WHY]
Some OLED panels require driver to write Aux BL before link training or
turning on backlight; otherwise monitor brightness will change.

[HOW]
Write the default Vesa Aux backlight control in dmub.

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Derek Lai <Derek.Lai@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Derek Lai 2025-10-31 10:58:52 +08:00 committed by Alex Deucher
parent 201648dc81
commit 08f133e932
5 changed files with 28 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/amd/display/dc/link/link_detection.c
View File

@ -989,7 +989,7 @@ static bool detect_link_and_local_sink(struct dc_link *link,
(link->dpcd_sink_ext_caps.bits.oled == 1)) { (link->dpcd_sink_ext_caps.bits.oled == 1)) {
dpcd_set_source_specific_data(link); dpcd_set_source_specific_data(link);
msleep(post_oui_delay); msleep(post_oui_delay);
set_default_brightness_aux(link); set_default_brightness(link);
} }
return true; return true;

4
drivers/gpu/drm/amd/display/dc/link/link_dpms.c
View File

@ -2115,7 +2115,7 @@ static enum dc_status enable_link_dp(struct dc_state *state,
skip_video_pattern = false; skip_video_pattern = false;
if (stream->sink_patches.oled_optimize_display_on) if (stream->sink_patches.oled_optimize_display_on)
set_default_brightness_aux(link); set_default_brightness(link);
if (perform_link_training_with_retries(link_settings, if (perform_link_training_with_retries(link_settings,
skip_video_pattern, skip_video_pattern,
@ -2141,7 +2141,7 @@ static enum dc_status enable_link_dp(struct dc_state *state,
link->dpcd_sink_ext_caps.bits.sdr_aux_backlight_control == 1 || link->dpcd_sink_ext_caps.bits.sdr_aux_backlight_control == 1 ||
link->dpcd_sink_ext_caps.bits.hdr_aux_backlight_control == 1) { link->dpcd_sink_ext_caps.bits.hdr_aux_backlight_control == 1) {
if (!stream->sink_patches.oled_optimize_display_on) { if (!stream->sink_patches.oled_optimize_display_on) {
set_default_brightness_aux(link); set_default_brightness(link);
if (link->dpcd_sink_ext_caps.bits.oled == 1) if (link->dpcd_sink_ext_caps.bits.oled == 1)
msleep(bl_oled_enable_delay); msleep(bl_oled_enable_delay);
edp_backlight_enable_aux(link, true); edp_backlight_enable_aux(link, true);

2
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
View File

@ -2167,7 +2167,7 @@ void detect_edp_sink_caps(struct dc_link *link)
link->dpcd_caps.set_power_state_capable_edp = link->dpcd_caps.set_power_state_capable_edp =
(general_edp_cap & DP_EDP_SET_POWER_CAP) ? true : false; (general_edp_cap & DP_EDP_SET_POWER_CAP) ? true : false;
set_default_brightness_aux(link); set_default_brightness(link);
core_link_read_dpcd(link, DP_EDP_DPCD_REV, core_link_read_dpcd(link, DP_EDP_DPCD_REV,
&link->dpcd_caps.edp_rev, &link->dpcd_caps.edp_rev,

26
drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
View File

@ -50,6 +50,11 @@ static const uint8_t DP_VGA_LVDS_CONVERTER_ID_2[] = "sivarT";
/* Nutmeg */ /* Nutmeg */
static const uint8_t DP_VGA_LVDS_CONVERTER_ID_3[] = "dnomlA"; static const uint8_t DP_VGA_LVDS_CONVERTER_ID_3[] = "dnomlA";
static const unsigned int pwr_default_min_brightness_millinits = 1000;
static const unsigned int pwr_default_sdr_brightness_millinits = 270000;
static const unsigned int pwr_default_min_backlight_pwm = 0xC0C;
static const unsigned int pwr_default_max_backlight_pwm = 0xFFFF;
void dp_set_panel_mode(struct dc_link *link, enum dp_panel_mode panel_mode) void dp_set_panel_mode(struct dc_link *link, enum dp_panel_mode panel_mode)
{ {
union dpcd_edp_config edp_config_set; union dpcd_edp_config edp_config_set;
@ -309,7 +314,7 @@ static bool read_default_bl_aux(struct dc_link *link, uint32_t *backlight_millin
return true; return true;
} }
bool set_default_brightness_aux(struct dc_link *link) bool set_default_brightness(struct dc_link *link)
{ {
uint32_t default_backlight; uint32_t default_backlight;
@ -320,8 +325,23 @@ bool set_default_brightness_aux(struct dc_link *link)
if (default_backlight < 1000 || default_backlight > 5000000) if (default_backlight < 1000 || default_backlight > 5000000)
default_backlight = 150000; default_backlight = 150000;
return edp_set_backlight_level_nits(link, true, if (link->backlight_control_type == BACKLIGHT_CONTROL_VESA_AUX &&
default_backlight, 0); link->dc->caps.dmub_caps.aux_backlight_support) {
struct set_backlight_level_params backlight_level_params = { 0 };
backlight_level_params.aux_inst = link->ddc->ddc_pin->hw_info.ddc_channel;
backlight_level_params.control_type = BACKLIGHT_CONTROL_VESA_AUX;
backlight_level_params.backlight_pwm_u16_16 = default_backlight;
backlight_level_params.transition_time_in_ms = 0;
// filled in the driver BL default values
backlight_level_params.min_luminance = pwr_default_min_brightness_millinits;
backlight_level_params.max_luminance = pwr_default_sdr_brightness_millinits;
backlight_level_params.min_backlight_pwm = pwr_default_min_backlight_pwm;
backlight_level_params.max_backlight_pwm = pwr_default_max_backlight_pwm;
return edp_set_backlight_level(link, &backlight_level_params);
} else
return edp_set_backlight_level_nits(link, true,
default_backlight, 0);
} }
return false; return false;
} }

2
drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.h
View File

@ -29,7 +29,7 @@
enum dp_panel_mode dp_get_panel_mode(struct dc_link *link); enum dp_panel_mode dp_get_panel_mode(struct dc_link *link);
void dp_set_panel_mode(struct dc_link *link, enum dp_panel_mode panel_mode); void dp_set_panel_mode(struct dc_link *link, enum dp_panel_mode panel_mode);
bool set_default_brightness_aux(struct dc_link *link); bool set_default_brightness(struct dc_link *link);
bool is_smartmux_suported(struct dc_link *link); bool is_smartmux_suported(struct dc_link *link);
void edp_panel_backlight_power_on(struct dc_link *link, bool wait_for_hpd); void edp_panel_backlight_power_on(struct dc_link *link, bool wait_for_hpd);
int edp_get_backlight_level(const struct dc_link *link); int edp_get_backlight_level(const struct dc_link *link);