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drm/i915: Change DCC tiling detection case to cover only mobile parts.

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Later spec investigation has revealed that every 9xx mobile part has
had this register in this format.  Also, no non-mobile parts have been shown
to have this register.  So make all mobile use the same code, and all
non-mobile use the hack 965 detection.

Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Eric Anholt 2009-03-12 16:27:11 -07:00
parent be0ea69674
commit 568d9a8f6d
1 changed files with 15 additions and 16 deletions
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31
drivers/gpu/drm/i915/i915_gem_tiling.c
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@ -96,16 +96,16 @@ i915_gem_detect_bit_6_swizzle(struct drm_device *dev)
*/
swizzle_x = I915_BIT_6_SWIZZLE_NONE;
swizzle_y = I915_BIT_6_SWIZZLE_NONE;
} else if ((!IS_I965G(dev) && !IS_G33(dev)) || IS_I965GM(dev) ||
IS_GM45(dev)) {
} else if (IS_MOBILE(dev)) {
uint32_t dcc;
/* On 915-945 and GM965, channel interleave by the CPU is
* determined by DCC. The CPU will alternate based on bit 6
* in interleaved mode, and the GPU will then also alternate
* on bit 6, 9, and 10 for X, but the CPU may also optionally
* alternate based on bit 17 (XOR not disabled and XOR
* bit == 17).
/* On mobile 9xx chipsets, channel interleave by the CPU is
* determined by DCC. For single-channel, neither the CPU
* nor the GPU do swizzling. For dual channel interleaved,
* the GPU's interleave is bit 9 and 10 for X tiled, and bit
* 9 for Y tiled. The CPU's interleave is independent, and
* can be based on either bit 11 (haven't seen this yet) or
* bit 17 (common).
*/
dcc = I915_READ(DCC);
switch (dcc & DCC_ADDRESSING_MODE_MASK) {
@ -115,19 +115,18 @@ i915_gem_detect_bit_6_swizzle(struct drm_device *dev)
swizzle_y = I915_BIT_6_SWIZZLE_NONE;
break;
case DCC_ADDRESSING_MODE_DUAL_CHANNEL_INTERLEAVED:
if (IS_I915G(dev) || IS_I915GM(dev) ||
dcc & DCC_CHANNEL_XOR_DISABLE) {
if (dcc & DCC_CHANNEL_XOR_DISABLE) {
/* This is the base swizzling by the GPU for
* tiled buffers.
*/
swizzle_x = I915_BIT_6_SWIZZLE_9_10;
swizzle_y = I915_BIT_6_SWIZZLE_9;
} else if ((IS_I965GM(dev) || IS_GM45(dev)) &&
(dcc & DCC_CHANNEL_XOR_BIT_17) == 0) {
/* GM965/GM45 does either bit 11 or bit 17
* swizzling.
*/
} else if ((dcc & DCC_CHANNEL_XOR_BIT_17) == 0) {
/* Bit 11 swizzling by the CPU in addition. */
swizzle_x = I915_BIT_6_SWIZZLE_9_10_11;
swizzle_y = I915_BIT_6_SWIZZLE_9_11;
} else {
/* Bit 17 or perhaps other swizzling */
/* Bit 17 swizzling by the CPU in addition. */
swizzle_x = I915_BIT_6_SWIZZLE_UNKNOWN;
swizzle_y = I915_BIT_6_SWIZZLE_UNKNOWN;
}