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drm/nouveau: workaround semaphore hw bug causing unnecessary interrupts 

The HW will only accept the DMA_FROM_MEMORY class for DMA_SEMAPHORE without
asking the driver to intervene.

It appears that semaphores will work correctly even without DMA_IN_MEMORY,
so lets avoid the large amount of interrupts generated by x-chan sync.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2011-07-25 20:26:19 +10:00
parent afb0c796d8
commit 91a8f1ea4b
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/nouveau/nouveau_fence.c
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@ -519,7 +519,7 @@ nouveau_fence_channel_init(struct nouveau_channel *chan)
if (USE_SEMA(dev) && dev_priv->chipset < 0x84) { if (USE_SEMA(dev) && dev_priv->chipset < 0x84) {
struct ttm_mem_reg *mem = &dev_priv->fence.bo->bo.mem; struct ttm_mem_reg *mem = &dev_priv->fence.bo->bo.mem;
ret = nouveau_gpuobj_dma_new(chan, NV_CLASS_DMA_IN_MEMORY, ret = nouveau_gpuobj_dma_new(chan, NV_CLASS_DMA_FROM_MEMORY,
mem->start << PAGE_SHIFT, mem->start << PAGE_SHIFT,
mem->size, NV_MEM_ACCESS_RW, mem->size, NV_MEM_ACCESS_RW,
NV_MEM_TARGET_VRAM, &obj); NV_MEM_TARGET_VRAM, &obj);