Revert "drm/i915: Declare the swizzling unknown for L-shaped configurations"

This reverts commit 19ee835cdb0b5a8eb11a68f25a51b8039d564488.

It breaks existing old userspace which doesn't handle UNKNOWN
swizzling correct. Yes UNKNOWN was a thing back in 2009 and probably
still is on some other platforms, but it still pretty clearly broke
the testers machine. If we want this we need to extend the ioctl with
new paramters that only new userspace looks at.

Cc: Harald Arnesen <harald@skogtun.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reported-by: Harald Arnesen <harald@skogtun.org>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c
index d61e74a..633bd1f 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_tiling.c
+++ b/drivers/gpu/drm/i915/i915_gem_tiling.c
@@ -183,18 +183,8 @@ i915_gem_detect_bit_6_swizzle(struct drm_device *dev)
                if (IS_GEN4(dev)) {
                        uint32_t ddc2 = I915_READ(DCC2);
 
-                       if (!(ddc2 & DCC2_MODIFIED_ENHANCED_DISABLE)) {
-                               /* Since the swizzling may vary within an
-                                * object, we have no idea what the swizzling
-                                * is for any page in particular. Thus we
-                                * cannot migrate tiled pages using the GPU,
-                                * nor can we tell userspace what the exact
-                                * swizzling is for any object.
-                                */
+                       if (!(ddc2 & DCC2_MODIFIED_ENHANCED_DISABLE))
                                dev_priv->quirks |= QUIRK_PIN_SWIZZLED_PAGES;
-                               swizzle_x = I915_BIT_6_SWIZZLE_UNKNOWN;
-                               swizzle_y = I915_BIT_6_SWIZZLE_UNKNOWN;
-                       }
                }
 
                if (dcc == 0xffffffff) {