diff options
| author | Iswara Nagulendran <iswara.nagulendran@amd.com> | 2023-07-10 14:01:35 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2023-07-25 13:39:14 -0400 |
| commit | 66c2596179beb858d1d04eb95125550163d1ec50 (patch) | |
| tree | 1bb90b81750534425d51b78a719fc43c696bc907 /drivers/gpu/drm/amd/display/dc/link | |
| parent | cbd0606e6a776bf2ba10d4a6957bb7628c0da947 (diff) | |
| download | linux-stable-66c2596179beb858d1d04eb95125550163d1ec50.tar.gz linux-stable-66c2596179beb858d1d04eb95125550163d1ec50.tar.bz2 linux-stable-66c2596179beb858d1d04eb95125550163d1ec50.zip | |
drm/amd/display: Add VESA SCR case for default aux backlight
[How & Why]
When determining default aux backlight level, read from
DPCD address 0x734 for VESA SCR on OLED.
Reviewed-by: Felipe Clark <felipe.clark@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Iswara Nagulendran <iswara.nagulendran@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/link')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c | 18 |
1 files changed, 14 insertions, 4 deletions
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 92f58a719c07..5add2360fc94 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 @@ -252,10 +252,20 @@ static bool read_default_bl_aux(struct dc_link *link, uint32_t *backlight_millin link->connector_signal != SIGNAL_TYPE_DISPLAY_PORT)) return false; - if (!core_link_read_dpcd(link, DP_SOURCE_BACKLIGHT_LEVEL, - (uint8_t *) backlight_millinits, - sizeof(uint32_t))) - return false; + if (!link->dpcd_caps.panel_luminance_control) { + if (!core_link_read_dpcd(link, DP_SOURCE_BACKLIGHT_LEVEL, + (uint8_t *)backlight_millinits, + sizeof(uint32_t))) + return false; + } else { + //setting to 0 as a precaution, since target_luminance_value is 3 bytes + memset(backlight_millinits, 0, sizeof(uint32_t)); + + if (!core_link_read_dpcd(link, DP_EDP_PANEL_TARGET_LUMINANCE_VALUE, + (uint8_t *)backlight_millinits, + sizeof(struct target_luminance_value))) + return false; + } return true; } |