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authorChris Wilson <chris@chris-wilson.co.uk>2012-07-05 23:49:40 +0100
committerDaniel Vetter <daniel.vetter@ffwll.ch>2012-07-20 12:21:37 +0200
commit67b1b57182972f3c89c1ff9a58951582cb6bcca7 (patch)
treee7b2bffefa0cd2ecc45d19fb26f9fcdaa9e11471 /drivers/gpu/drm/i915/i915_gem.c
parent0232e927f8b0b37f5c82648f9bc45e55fb245068 (diff)
downloadblackbird-op-linux-67b1b57182972f3c89c1ff9a58951582cb6bcca7.tar.gz
blackbird-op-linux-67b1b57182972f3c89c1ff9a58951582cb6bcca7.zip
drm/i915: Disable the BLT on pre-production SNB hardware
It never quite worked despite the numerous workarounds, yet I still see people trying to use this hardware and filing bug reports. As we no longer even try to implement the workarounds, since 6a233c78878 (drm/i915/ringbuffer: kill snb blt workaround), simply disable the ring. v2: Add a message to inform the user about the limited capabilities of their pre-production hardware. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem.c')
-rw-r--r--drivers/gpu/drm/i915/i915_gem.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 0fdb3d29cbbb..89d62f635ac8 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3726,6 +3726,22 @@ void i915_gem_init_ppgtt(struct drm_device *dev)
}
}
+static bool
+intel_enable_blt(struct drm_device *dev)
+{
+ if (!HAS_BLT(dev))
+ return false;
+
+ /* The blitter was dysfunctional on early prototypes */
+ if (IS_GEN6(dev) && dev->pdev->revision < 8) {
+ DRM_INFO("BLT not supported on this pre-production hardware;"
+ " graphics performance will be degraded.\n");
+ return false;
+ }
+
+ return true;
+}
+
int
i915_gem_init_hw(struct drm_device *dev)
{
@@ -3749,7 +3765,7 @@ i915_gem_init_hw(struct drm_device *dev)
goto cleanup_render_ring;
}
- if (HAS_BLT(dev)) {
+ if (intel_enable_blt(dev)) {
ret = intel_init_blt_ring_buffer(dev);
if (ret)
goto cleanup_bsd_ring;
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