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drm/i915: Document and reject invalid tiling modes
Through the GTT interface to the fence registers, we can only handle linear, X and Y tiling. The more esoteric tiling patterns are ignored. Document that the tiling ABI only supports upto Y tiling, and reject any attempts to set a tiling mode other than NONE, X or Y. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1470388464-28458-17-git-send-email-chris@chris-wilson.co.uk
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@ -68,6 +68,9 @@ i915_tiling_ok(struct drm_device *dev, int stride, int size, int tiling_mode)
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if (tiling_mode == I915_TILING_NONE)
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return true;
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if (tiling_mode > I915_TILING_LAST)
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return false;
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if (IS_GEN2(dev) ||
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(tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev)))
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tile_width = 128;
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@ -926,6 +926,7 @@ struct drm_i915_gem_caching {
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#define I915_TILING_NONE 0
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#define I915_TILING_X 1
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#define I915_TILING_Y 2
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#define I915_TILING_LAST I915_TILING_Y
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#define I915_BIT_6_SWIZZLE_NONE 0
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#define I915_BIT_6_SWIZZLE_9 1
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