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authorEric Anholt <eric@anholt.net>2008-11-25 14:02:05 -0800
committerDave Airlie <airlied@redhat.com>2008-12-04 11:21:41 +1000
commita7f014f2de04893f95cfe40fe35f15c8dae4b36e (patch)
treed68e3746e42691d910321594d6e302557382765d /drivers/gpu/drm/i915/i915_gem_tiling.c
parentfeaf3848a813a106f163013af6fcf6c4bfec92d9 (diff)
drm/i915: Respect GM965/GM45 bit-17-instead-of-bit-11 option for swizzling.
This fixes readpixels and buffer corruption when swapped out and in by disabling tiling on them. Now that we know that the bit 17 mode isn't just a mistake of older chipsets, we'll need to work on a clever fix so that we can get the performance of tiling on these chipsets, but that will require intrusive changes targeted at the next kernel release, not this one. Signed-off-by: Eric Anholt <eric@anholt.net> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_tiling.c')
-rw-r--r--drivers/gpu/drm/i915/i915_gem_tiling.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c
index e8b85ac4ca04..a8cb69469c64 100644
--- a/drivers/gpu/drm/i915/i915_gem_tiling.c
+++ b/drivers/gpu/drm/i915/i915_gem_tiling.c
@@ -119,9 +119,10 @@ i915_gem_detect_bit_6_swizzle(struct drm_device *dev)
dcc & DCC_CHANNEL_XOR_DISABLE) {
swizzle_x = I915_BIT_6_SWIZZLE_9_10;
swizzle_y = I915_BIT_6_SWIZZLE_9;
- } else if (IS_I965GM(dev) || IS_GM45(dev)) {
- /* GM965 only does bit 11-based channel
- * randomization
+ } else if ((IS_I965GM(dev) || IS_GM45(dev)) &&
+ (dcc & DCC_CHANNEL_XOR_BIT_17) == 0) {
+ /* GM965/GM45 does either bit 11 or bit 17
+ * swizzling.
*/
swizzle_x = I915_BIT_6_SWIZZLE_9_10_11;
swizzle_y = I915_BIT_6_SWIZZLE_9_11;