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drm/amd/display: Detect dynamic backlight support in eDP sink

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[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.chan@amd.com>
Acked-by: Bindu Ramamurthy <bindu.r@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Roy Chan 2020-10-30 18:00:02 -04:00 committed by Alex Deucher
parent 786b406174
commit 65e870dfa6
2 changed files with 8 additions and 0 deletions
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7
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
View file

@ -3745,6 +3745,7 @@ 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;
@ -3775,6 +3776,12 @@ 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);
}

1
drivers/gpu/drm/amd/display/dc/dc.h
View file

@ -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;