From: Roy Chan <roy.c...@amd.com>
[Why]
Check if the eDP sink supports the dynamic backlight control
[How]
Query the dynamic backlight capability in DPCD (eDP case only)
Signed-off-by: Roy Chan <roy.c...@amd.com>
Acked-by: Bindu Ramamurthy <bind...@amd.com>
---
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 7 +++++++
drivers/gpu/drm/amd/display/dc/dc.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 6c60c1fdebdc..c9f4f2d3bed6 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -3740,6 +3740,7 @@ void detect_edp_sink_caps(struct dc_link *link)
uint32_t entry;
uint32_t link_rate_in_khz;
enum dc_link_rate link_rate = LINK_RATE_UNKNOWN;
+ uint8_t backlight_adj_cap;
retrieve_link_cap(link);
link->dpcd_caps.edp_supported_link_rates_count = 0;
@@ -3770,6 +3771,12 @@ void detect_edp_sink_caps(struct dc_link *link)
}
link->verified_link_cap = link->reported_link_cap;
+ core_link_read_dpcd(link, DP_EDP_BACKLIGHT_ADJUSTMENT_CAP,
+ &backlight_adj_cap,
sizeof(backlight_adj_cap));
+
+ link->dpcd_caps.dynamic_backlight_capable_edp =
+ (backlight_adj_cap &
DP_EDP_DYNAMIC_BACKLIGHT_CAP) ? true:false;
+
dc_link_set_default_brightness_aux(link);
}
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h
b/drivers/gpu/drm/amd/display/dc/dc.h
index 4c57cf099b5e..52e819678ecd 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -1091,6 +1091,7 @@ struct dpcd_caps {
bool panel_mode_edp;
bool dpcd_display_control_capable;
bool ext_receiver_cap_field_present;
+ bool dynamic_backlight_capable_edp;
union dpcd_fec_capability fec_cap;
struct dpcd_dsc_capabilities dsc_caps;
struct dc_lttpr_caps lttpr_caps;
--
2.25.1
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