From 2bded9ec6992eba5662771fd029867de3170c0dd Mon Sep 17 00:00:00 2001
From: Roman Li <Roman.Li@amd.com>
Date: Wed, 17 Nov 2021 10:05:36 -0500
Subject: drm/amd/display: Fix OLED brightness control on eDP
MIME-Version: 1.0
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Alt-commit: b295ce39912cb10d3bd34fba556e4009b67954db
Git-commit: dab60582685aabdae2d4ff7ce716456bd0dc7a0f
Patch-mainline: v5.16-rc2
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
[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
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
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 c911b30de658..c27cb47bc988 100644
--- 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);
}
--
2.38.1