This is a note to let you know that I've just added the patch titled
drm/i915: Allow panel fixed modes to have differing sync polarities
to the 6.1-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-i915-allow-panel-fixed-modes-to-have-differing-s.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 57486875806e8d4b58fb741c544c625e2b316e7e
Author: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Date: Thu Oct 20 12:39:38 2022 +0300
drm/i915: Allow panel fixed modes to have differing sync polarities
[ Upstream commit 2bd0db4b3f0bd529f75b32538fc5a3775e3591c0 ]
Apparently some panels declare multiple modes with random
sync polarities. Seems a bit weird, but looks like Windows/GOP
doesn't care, so let follow suit and accept alternate fixed
modes regardless of their sync polarities.
v2: Don't pollute the DRM_ namespace with a define (Jani)
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/6968
Acked-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20221020093938.27200-1-ville.syrjala@xxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/i915/display/intel_panel.c b/drivers/gpu/drm/i915/display/intel_panel.c
index 41cec9dc4223..f72f4646c0d7 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.c
+++ b/drivers/gpu/drm/i915/display/intel_panel.c
@@ -85,9 +85,10 @@ static bool is_alt_drrs_mode(const struct drm_display_mode *mode,
static bool is_alt_fixed_mode(const struct drm_display_mode *mode,
const struct drm_display_mode *preferred_mode)
{
- return drm_mode_match(mode, preferred_mode,
- DRM_MODE_MATCH_FLAGS |
- DRM_MODE_MATCH_3D_FLAGS) &&
+ u32 sync_flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NHSYNC |
+ DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC;
+
+ return (mode->flags & ~sync_flags) == (preferred_mode->flags & ~sync_flags) &&
mode->hdisplay == preferred_mode->hdisplay &&
mode->vdisplay == preferred_mode->vdisplay;
}
