diff options
| author | Eric Anholt <eric@anholt.net> | 2008-07-14 09:16:45 -0700 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2008-07-14 09:16:45 -0700 |
| commit | 78f1fc9cbcb383d42d903a8b9febdcf3c438ea7c (patch) | |
| tree | 4d26c1145cca741bfa5d04062b488d009146df1a /linux-core | |
| parent | a0474be4e78d678eb615b37aad355effb955ee19 (diff) | |
intel-gem: Disable tiling if we get junk from the MCHBAR read.
One of our systems has been returning 0xffffffff from all MCHBAR reads, which
means we'll need to figure out why, or add an alternate detection method.
Diffstat (limited to 'linux-core')
| -rw-r--r-- | linux-core/i915_gem_tiling.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/linux-core/i915_gem_tiling.c b/linux-core/i915_gem_tiling.c index d66276d6..ddf83ce4 100644 --- a/linux-core/i915_gem_tiling.c +++ b/linux-core/i915_gem_tiling.c @@ -155,7 +155,10 @@ i915_gem_detect_bit_6_swizzle(struct drm_device *dev) */ chdecmisc = readb(mchbar + CHDECMISC); - if (chdecmisc & CHDECMISC_FLEXMEMORY) { + if (chdecmisc == 0xff) { + DRM_ERROR("Couldn't read from MCHBAR. " + "Disabling tiling.\n"); + } else if (chdecmisc & CHDECMISC_FLEXMEMORY) { swizzle_x = I915_BIT_6_SWIZZLE_NONE; swizzle_y = I915_BIT_6_SWIZZLE_NONE; } else { @@ -197,6 +200,12 @@ i915_gem_detect_bit_6_swizzle(struct drm_device *dev) } break; } + if (dcc == 0xffffffff) { + DRM_ERROR("Couldn't read from MCHBAR. " + "Disabling tiling.\n"); + swizzle_x = I915_BIT_6_SWIZZLE_UNKNOWN; + swizzle_y = I915_BIT_6_SWIZZLE_UNKNOWN; + } } iounmap(mchbar); |