[PATCH 6/8] drm/i915: don't bother enabling swizzle bits on gen7+

Jesse Barnes
2014-03-07T16:58:06Z

As of IVB, the memory controller does internal swizzling already, so we
shouldn't need to enable these. Based on an earlier fix from Kristian.

Reported-by: Kristian Høgsberg <hoegsberg@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
drivers/gpu/drm/i915/i915_gem.c | 7 +++----
drivers/gpu/drm/i915/i915_gem_tiling.c | 2 +-
2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 18ea6bc..dcf4b01 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4296,6 +4296,9 @@ void i915_gem_init_swizzling(struct drm_device *dev)
dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_NONE)
return;

+ if (INTEL_INFO(dev)->gen >= 7)
+ return;
+
I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
DISP_TILE_SURFACE_SWIZZLING);

@@ -4305,10 +4308,6 @@ void i915_gem_init_swizzling(struct drm_device *dev)
I915_WRITE(TILECTL, I915_READ(TILECTL) | TILECTL_SWZCTL);
if (IS_GEN6(dev))
I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_SNB));
- else if (IS_GEN7(dev))
- I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_IVB));
- else if (IS_GEN8(dev))
- I915_WRITE(GAMTARBMODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_BDW));
else
BUG();
}
diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c
index eb99358..05c5d98 100644
--- a/drivers/gpu/drm/i915/i915_gem_tiling.c
+++ b/drivers/gpu/drm/i915/i915_gem_tiling.c
@@ -91,7 +91,7 @@ i915_gem_detect_bit_6_swizzle(struct drm_device *dev)
uint32_t swizzle_x = I915_BIT_6_SWIZZLE_UNKNOWN;
uint32_t swizzle_y = I915_BIT_6_SWIZZLE_UNKNOWN;

- if (IS_VALLEYVIEW(dev)) {
+ if (INTEL_INFO(dev)->gen >= 7) {
swizzle_x = I915_BIT_6_SWIZZLE_NONE;
swizzle_y = I915_BIT_6_SWIZZLE_NONE;
} else if (INTEL_INFO(dev)->gen >= 6) {
--
1.8.4.2

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