linux-kernel - [PATCH] fix i915 regression: only top 20% of screen works in X

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Date:	Thu, 24 Apr 2014 22:13:49 +0200
From:	Pavel Machek <pavel@....cz>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	Chris Wilson <chris@...is-wilson.co.uk>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	Jiri Kosina <jikos@...os.cz>
Subject: [PATCH] fix i915 regression: only top 20% of screen works in X


Fix regression where only 20% of screen works in X. This is manual
revert of a51435a3137ad8ae75c288c39bd2d8b2696bae8f.

Signed-off-by: Pavel Machek <pavel@....cz>


diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 6bc68bd..cf63c67 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -447,6 +447,11 @@ static int init_ring_common(struct intel_ring_buffer *ring)
 
 	gen6_gt_force_wake_get(dev_priv, FORCEWAKE_ALL);
 
+	if (I915_NEED_GFX_HWS(dev))
+		intel_ring_setup_status_page(ring);
+	else
+		ring_setup_phys_status_page(ring);
+
 	/* Stop the ring if it's running. */
 	I915_WRITE_CTL(ring, 0);
 	I915_WRITE_HEAD(ring, 0);
@@ -454,11 +459,6 @@ static int init_ring_common(struct intel_ring_buffer *ring)
 	if (wait_for_atomic((I915_READ_MODE(ring) & MODE_IDLE) != 0, 1000))
 		DRM_ERROR("%s :timed out trying to stop ring\n", ring->name);
 
-	if (I915_NEED_GFX_HWS(dev))
-		intel_ring_setup_status_page(ring);
-	else
-		ring_setup_phys_status_page(ring);
-
 	head = I915_READ_HEAD(ring) & HEAD_ADDR;
 
 	/* G45 ring initialization fails to reset head to zero */


-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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