From: Roy Chan <roy.chan@xxxxxxx> [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@xxxxxxx> Acked-by: Bindu Ramamurthy <bindu.r@xxxxxxx> --- 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 _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx