This is a note to let you know that I've just added the patch titled
drm/mgag200: Fix gamma lut not initialized.
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-mgag200-fix-gamma-lut-not-initialized.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ad81e23426a651eb89a4b306e1c4169e6308c124 Mon Sep 17 00:00:00 2001
From: Jocelyn Falempe <jfalempe@xxxxxxxxxx>
Date: Wed, 10 May 2023 15:10:34 +0200
Subject: drm/mgag200: Fix gamma lut not initialized.
From: Jocelyn Falempe <jfalempe@xxxxxxxxxx>
commit ad81e23426a651eb89a4b306e1c4169e6308c124 upstream.
When mgag200 switched from simple KMS to regular atomic helpers,
the initialization of the gamma settings was lost.
This leads to a black screen, if the bios/uefi doesn't use the same
pixel color depth.
v2: rebase on top of drm-misc-fixes, and add Cc stable tag.
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2171155
Fixes: 1baf9127c482 ("drm/mgag200: Replace simple-KMS with regular atomic helpers")
Cc: <stable@xxxxxxxxxxxxxxx>
Tested-by: Phil Oester <kernel@xxxxxxxxxxxx>
Reviewed-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Signed-off-by: Jocelyn Falempe <jfalempe@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230510131034.284078-1-jfalempe@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/mgag200/mgag200_mode.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -640,6 +640,11 @@ void mgag200_crtc_helper_atomic_enable(s
if (funcs->pixpllc_atomic_update)
funcs->pixpllc_atomic_update(crtc, old_state);
+ if (crtc_state->gamma_lut)
+ mgag200_crtc_set_gamma(mdev, format, crtc_state->gamma_lut->data);
+ else
+ mgag200_crtc_set_gamma_linear(mdev, format);
+
mgag200_enable_display(mdev);
if (funcs->enable_vidrst)
Patches currently in stable-queue which might be from jfalempe@xxxxxxxxxx are
queue-6.3/drm-mgag200-fix-gamma-lut-not-initialized.patch
