Patch "drm/i915: preserve pipe A quirk in i9xx_set_pipeconf" has been added to the 3.10-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/i915: preserve pipe A quirk in i9xx_set_pipeconf

to the 3.10-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-preserve-pipe-a-quirk-in-i9xx_set_pipeconf.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 67c72a12254101d4e8d9b9f3a02646ba0be84a2d Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date: Tue, 24 Sep 2013 11:46:14 +0200
Subject: drm/i915: preserve pipe A quirk in i9xx_set_pipeconf

From: Daniel Vetter <daniel.vetter@xxxxxxxx>

commit 67c72a12254101d4e8d9b9f3a02646ba0be84a2d upstream.

This regression has been introduced in

commit 9f11a9e4e50006b615ba94722dfc33ced89664cf
Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date:   Thu Jun 13 00:54:58 2013 +0200

    drm/i915: set up PIPECONF explicitly for i9xx/vlv platforms

Ville brough up the idea that this is just the pipe A quirk gone
wrong.

Note that after resume the bios might or might not have enabled pipe A
already.  We have a bit of magic to make sure that on resume we set up
a decent mode for pipe A, but I fear if I just smash pipe A to always
on we'd enable it in a bogus state and hang the hw. Hence the
readback.

v2: Clarify the logic a bit as suggested by Chris. Also amend the
commit message to clarify why we don't unconditionally enable the
pipe.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=66462
References: https://lkml.org/lkml/2013/8/26/238
Cc: Meelis Roos <mroos@xxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
[danvet: Use |= instead of = as suggested by Chris.]
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
@@ -4564,6 +4564,10 @@ static void i9xx_set_pipeconf(struct int
 
 	pipeconf = I915_READ(PIPECONF(intel_crtc->pipe));
 
+	if (dev_priv->quirks & QUIRK_PIPEA_FORCE &&
+	    I915_READ(PIPECONF(intel_crtc->pipe)) & PIPECONF_ENABLE)
+		pipeconf |= PIPECONF_ENABLE;
+
 	if (intel_crtc->pipe == 0 && INTEL_INFO(dev)->gen < 4) {
 		/* Enable pixel doubling when the dot clock is > 90% of the (display)
 		 * core speed.


Patches currently in stable-queue which might be from daniel.vetter@xxxxxxxx are

queue-3.10/drm-i915-preserve-pipe-a-quirk-in-i9xx_set_pipeconf.patch
queue-3.10/drm-i915-tv-clear-adjusted_mode.flags.patch
queue-3.10/drm-i915-dp-increase-i2c-over-aux-retry-interval-on-aux-defer.patch
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