This is a note to let you know that I've just added the patch titled
drm/i915: flush cursors harder
to the 3.4-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-flush-cursors-harder.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b2ea8ef559b4d94190009f3651b5b3ab7c05afd3 Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date: Mon, 4 Nov 2013 08:13:45 +0100
Subject: drm/i915: flush cursors harder
From: Daniel Vetter <daniel.vetter@xxxxxxxx>
commit b2ea8ef559b4d94190009f3651b5b3ab7c05afd3 upstream.
Apparently they need the same treatment as primary planes. This fixes
modesetting failures because of stuck cursors (!) on Thomas' i830M
machine.
I've figured while at it I'll also roll it out for the ivb 3 pipe
version of this function. I didn't do this for i845/i865 since Bspec
says the update mechanism works differently, and there's some
additional rules about what can be updated in which order.
Tested-by: Thomas Richter <thor@xxxxxxxxxxxxxxxxx>
Cc: Thomas Richter <thor@xxxxxxxxxxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6377,7 +6377,9 @@ static void i9xx_update_cursor(struct dr
intel_crtc->cursor_visible = visible;
}
/* and commit changes on next vblank */
+ POSTING_READ(CURCNTR(pipe));
I915_WRITE(CURBASE(pipe), base);
+ POSTING_READ(CURBASE(pipe));
}
static void ivb_update_cursor(struct drm_crtc *crtc, u32 base)
@@ -6402,7 +6404,9 @@ static void ivb_update_cursor(struct drm
intel_crtc->cursor_visible = visible;
}
/* and commit changes on next vblank */
+ POSTING_READ(CURCNTR_IVB(pipe));
I915_WRITE(CURBASE_IVB(pipe), base);
+ POSTING_READ(CURBASE_IVB(pipe));
}
/* If no-part of the cursor is visible on the framebuffer, then the GPU may hang... */
Patches currently in stable-queue which might be from daniel.vetter@xxxxxxxx are
queue-3.4/drm-i915-flush-cursors-harder.patch
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