drm/amd/display: Fix OLED brightness control on eDP

[Why]
After commit ("drm/amdgpu/display: add support for multiple backlights")
number of eDPs is defined while registering backlight device.
However the panel's extended caps get updated once before register call.
That leads to regression with extended caps like oled brightness control.

[How]
Update connector ext caps after register_backlight_device

Fixes: 7fd13baeb7a3a4 ("drm/amdgpu/display: add support for multiple backlights")
Link: https://www.reddit.com/r/AMDLaptops/comments/qst0fm/after_updating_to_linux_515_my_brightness/
Signed-off-by: Roman Li <Roman.Li@amd.com>
Tested-by: Samuel Čavoj <samuel@cavoj.net>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Jasdeep Dhillon <Jasdeep.Dhillon@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

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 c911b30de6588e707611095c61975d7241652589..c27cb47bc9881a554752b5d3d07ab35f498751bc 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4242,7 +4242,8 @@ static int amdgpu_dm_initialize_drm_device(struct amdgpu_device *adev)
                } else if (dc_link_detect(link, DETECT_REASON_BOOT)) {
                        amdgpu_dm_update_connector_after_detect(aconnector);
                        register_backlight_device(dm, link);
-
+                       if (dm->num_of_edps)
+                               update_connector_ext_caps(aconnector);
                        if (psr_feature_enabled)
                                amdgpu_dm_set_psr_caps(link);
                }