linux-kernel - [PATCH] DRM/i915: only use tiled blits on 965+

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Date:	Tue, 1 Jul 2008 12:32:52 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dave Airlie <airlied@...ux.ie>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] DRM/i915: only use tiled blits on 965+

When scheduled swaps occur, we need to blit between front & back buffers.  If
the buffers are tiled, we need to set the appropriate XY_SRC_COPY tile bit,
but only on 965 chips, since it will cause corruption on pre-965 (e.g. 945).

Bug reported by and fix tested by Tomas Janousek <tomi@...i.cz>.

Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>

diff --git a/drivers/char/drm/i915_irq.c b/drivers/char/drm/i915_irq.c
index f7f16e7..df03611 100644
--- a/drivers/char/drm/i915_irq.c
+++ b/drivers/char/drm/i915_irq.c
@@ -62,11 +62,11 @@ static void i915_vblank_tasklet(struct drm_device *dev)
 	u32 ropcpp = (0xcc << 16) | ((cpp - 1) << 24);
 	RING_LOCALS;
 
-	if (sarea_priv->front_tiled) {
+	if (IS_I965G(dev) && sarea_priv->front_tiled) {
 		cmd |= XY_SRC_COPY_BLT_DST_TILED;
 		dst_pitch >>= 2;
 	}
-	if (sarea_priv->back_tiled) {
+	if (IS_I965G(dev) && sarea_priv->back_tiled) {
 		cmd |= XY_SRC_COPY_BLT_SRC_TILED;
 		src_pitch >>= 2;
 	}
--
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