This is a note to let you know that I've just added the patch titled
drm/i915: Avoid stalling on pending flips for legacy cursor updates
to the 4.5-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-avoid-stalling-on-pending-flips-for-legacy-cursor-updates.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7ac7d19f808697abe6658c64c96868f728273f9c Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Date: Sun, 17 Apr 2016 20:42:46 +0100
Subject: drm/i915: Avoid stalling on pending flips for legacy cursor updates
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From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
commit 7ac7d19f808697abe6658c64c96868f728273f9c upstream.
The legacy cursor ioctl expects to be asynchronous with respect to other
screen updates, in particular page flips. As X updates the cursor from a
signal context, if the cursor blocks then it will stall both the input
and output chains causing bad stuttering and horrible UX.
Reported-and-tested-by: Rafael Ristovski <rafael.ristovski@xxxxxxxxx>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94980
Fixes: 5008e874edd34 ("drm/i915: Make wait_for_flips interruptible.")
Suggested-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/1460922166-20292-1-git-send-email-chris@xxxxxxxxxxxxxxxxxx
Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
(cherry picked from commit acf4e84d6167317ff21be5c03e1ea76ea5783701)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13429,6 +13429,9 @@ static int intel_atomic_prepare_commit(s
}
for_each_crtc_in_state(state, crtc, crtc_state, i) {
+ if (state->legacy_cursor_update)
+ continue;
+
ret = intel_crtc_wait_for_pending_flips(crtc);
if (ret)
return ret;
Patches currently in stable-queue which might be from chris@xxxxxxxxxxxxxxxxxx are
queue-4.5/drm-i915-avoid-stalling-on-pending-flips-for-legacy-cursor-updates.patch
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