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drm/i915: Disable the BLT on pre-production SNB hardware

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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 6a233c7887
(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>
This commit is contained in:
Chris Wilson 2012-07-05 23:49:40 +01:00 committed by Daniel Vetter
parent 0232e927f8
commit 67b1b57182
1 changed files with 17 additions and 1 deletions
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18
drivers/gpu/drm/i915/i915_gem.c
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@ -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;