This is a note to let you know that I've just added the patch titled
drm/i915/mst: Reject modes that require the bigjoiner
to the 6.6-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-mst-reject-modes-that-require-the-bigjoiner.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From dd7eb65c493615fda7d459501c3d4a46e00ea5ba Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx>
Date: Mon, 27 Nov 2023 16:50:27 +0200
Subject: drm/i915/mst: Reject modes that require the bigjoiner
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From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
commit dd7eb65c493615fda7d459501c3d4a46e00ea5ba upstream.
We have no bigjoiner support in the MST code, so .mode_valid()
pretending otherwise is just going to result black screens for
users. Reject any mode that needs the joiner.
Cc: stable@xxxxxxxxxxxxxxx
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
Fixes: d51f25eb479a ("drm/i915: Add DSC support to MST path")
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20231127145028.4899-3-ville.syrjala@xxxxxxxxxxxxxxx
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
(cherry picked from commit 9c058492b16f90bb772cb0dad567e8acc68e155d)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp_mst.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -955,6 +955,10 @@ intel_dp_mst_mode_valid_ctx(struct drm_c
if (intel_dp_need_bigjoiner(intel_dp, mode->hdisplay, target_clock)) {
bigjoiner = true;
max_dotclk *= 2;
+
+ /* TODO: add support for bigjoiner */
+ *status = MODE_CLOCK_HIGH;
+ return 0;
}
if (DISPLAY_VER(dev_priv) >= 10 &&
Patches currently in stable-queue which might be from ville.syrjala@xxxxxxxxxxxxxxx are
queue-6.6/drm-i915-mst-reject-modes-that-require-the-bigjoiner.patch
queue-6.6/drm-i915-mst-fix-.mode_valid_ctx-return-values.patch
queue-6.6/drm-i915-skip-some-timing-checks-on-bxt-glk-dsi-transcoders.patch
