mirror-linux/drivers/gpu/drm/amd/display
Alex Deucher f2ad3accef drm/amdgpu/display: only enable aux backlight control for OLED panels
We've gotten a number of reports about backlight control not
working on panels which indicate that they use aux backlight
control.  A recent patch:

commit 2d73eabe29
Author: Camille Cho <Camille.Cho@amd.com>
Date:   Thu Jul 8 18:28:37 2021 +0800

    drm/amd/display: Only set default brightness for OLED

    [Why]
    We used to unconditionally set backlight path as AUX for panels capable
    of backlight adjustment via DPCD in set default brightness.

    [How]
    This should be limited to OLED panel only since we control backlight via
    PWM path for SDR mode in LCD HDR panel.

    Reviewed-by: Krunoslav Kovac <krunoslav.kovac@amd.com>
    Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
    Signed-off-by: Camille Cho <Camille.Cho@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Changes some other code to only use aux for backlight control on
OLED panels.  The commit message seems to indicate that PWM should
be used for SDR mode on HDR panels.  Do something similar for
backlight control in general.  This may need to be revisited if and
when HDR started to get used.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1438
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=213715
Reviewed-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2021-07-27 12:47:39 -04:00
..
amdgpu_dm drm/amdgpu/display: only enable aux backlight control for OLED panels 2021-07-27 12:47:39 -04:00
dc drm/amd/display: ensure dentist display clock update finished in DCN20 2021-07-27 12:45:49 -04:00
dmub drm/amd/display: Extend DMUB diagnostic logging to DCN3.1 2021-07-01 00:05:40 -04:00
include drm/amdgpu/display: fold DRM_AMD_DC_DCN3_1 into DRM_AMD_DC_DCN 2021-06-22 16:51:45 -04:00
modules drm/amdgpu/display: fold DRM_AMD_DC_DCN3_1 into DRM_AMD_DC_DCN 2021-06-22 16:51:45 -04:00
Kconfig drm/amdgpu/display: fold DRM_AMD_DC_DCN3_1 into DRM_AMD_DC_DCN 2021-06-22 16:51:45 -04:00
Makefile
TODO