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

[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>

5 files changed, 28 insertions, 8 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/link/link_detection.c b/drivers/gpu/drm/amd/display/dc/link/link_detection.c
index 6d31f4967f1a..9746bb2f6c3b 100644
--- a/drivers/gpu/drm/amd/display/dc/link/link_detection.c
+++ b/drivers/gpu/drm/amd/display/dc/link/link_detection.c
@@ -989,7 +989,7 @@ static bool detect_link_and_local_sink(struct dc_link *link,
 			(link->dpcd_sink_ext_caps.bits.oled == 1)) {
 			dpcd_set_source_specific_data(link);
 			msleep(post_oui_delay);
-			set_default_brightness_aux(link);
+			set_default_brightness(link);
 		}
 
 		return true;
diff --git a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
index 6ae134147617..31ce52734edd 100644
--- a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
+++ b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
@@ -2115,7 +2115,7 @@ static enum dc_status enable_link_dp(struct dc_state *state,
 		skip_video_pattern = false;
 
 	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,
 					       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.hdr_aux_backlight_control == 1) {
 		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)
 				msleep(bl_oled_enable_delay);
 			edp_backlight_enable_aux(link, true);
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
index ad90a0106938..3884851e2a9e 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
@@ -2167,7 +2167,7 @@ void detect_edp_sink_caps(struct dc_link *link)
 	link->dpcd_caps.set_power_state_capable_edp =
 				(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,
 		&link->dpcd_caps.edp_rev,
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
index 99741c1334ca..0b05ee9f6ea1 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
@@ -50,6 +50,11 @@ static const uint8_t DP_VGA_LVDS_CONVERTER_ID_2[] = "sivarT";
 /* Nutmeg */
 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)
 {
 	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;
 }
 
-bool set_default_brightness_aux(struct dc_link *link)
+bool set_default_brightness(struct dc_link *link)
 {
 	uint32_t default_backlight;
 
@@ -320,8 +325,23 @@ bool set_default_brightness_aux(struct dc_link *link)
 		if (default_backlight < 1000 || default_backlight > 5000000)
 			default_backlight = 150000;
 
-		return edp_set_backlight_level_nits(link, true,
-				default_backlight, 0);
+		if (link->backlight_control_type == BACKLIGHT_CONTROL_VESA_AUX &&
+			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;
 }
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.h b/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.h
index 360129732109..fd63b5d0f948 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.h
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.h
@@ -29,7 +29,7 @@
 
 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);
-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);
 void edp_panel_backlight_power_on(struct dc_link *link, bool wait_for_hpd);
 int edp_get_backlight_level(const struct dc_link *link);