drm/amd/display: OLED panel backlight adjust not work with external display connected

[Why]
amdgpu_dm->backlight_caps is for single eDP only. the caps are upddated
for very connector. Real eDP caps will be overwritten by other external
display. For OLED panel, caps->aux_support is set to 1 for OLED pnael.
after external connected, caps+.aux_support is set to 0. This causes
OLED backlight adjustment not work.

[How]
within update_conector_ext_caps, backlight caps will be updated only for
eDP connector.

Cc: stable@vger.kernel.org
Signed-off-by: hersen wu <hersenxs.wu@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 6f937e25a62c47dd6073268e912c01af396a5de3..9c283531e1a2874cc5a8263d16cdf6e5dfabf89d 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2028,6 +2028,7 @@ static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnector)
        struct amdgpu_display_manager *dm;
        struct drm_connector *conn_base;
        struct amdgpu_device *adev;
+       struct dc_link *link = NULL;
        static const u8 pre_computed_values[] = {
                50, 51, 52, 53, 55, 56, 57, 58, 59, 61, 62, 63, 65, 66, 68, 69,
                71, 72, 74, 75, 77, 79, 81, 82, 84, 86, 88, 90, 92, 94, 96, 98};
@@ -2035,6 +2036,10 @@ static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnector)
        if (!aconnector || !aconnector->dc_link)
                return;
 
+       link = aconnector->dc_link;
+       if (link->connector_signal != SIGNAL_TYPE_EDP)
+               return;
+
        conn_base = &aconnector->base;
        adev = conn_base->dev->dev_private;
        dm = &adev->dm;