drm/i915: Disable the BLT on pre-production SNB hardware (67b1b571) · Commits · 戴 / test

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 (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>

drivers/gpu/drm/i915/i915_gem.c

+17 −1

Original line number	Diff line number	Diff line
		@@ -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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