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drm/radeon: update rptr saving logic for memory buffers

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Add support for using memory buffers rather than
scratch registers.  Some rings may not be able to
write to scratch registers.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Alex Deucher
2012-07-17 14:02:31 -04:00
committed by Christian König
parent 8b25ed3482
commit 89d35807fb
5 changed files with 67 additions and 9 deletions
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20
drivers/gpu/drm/radeon/r600.c
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@@ -2163,10 +2163,12 @@ void r600_ring_init(struct radeon_device *rdev, struct radeon_ring *ring, unsign
ring->ring_size = ring_size;
ring->align_mask = 16 - 1;
r = radeon_scratch_get(rdev, &ring->rptr_save_reg);
if (r) {
DRM_ERROR("failed to get scratch reg for rptr save (%d).\n", r);
ring->rptr_save_reg = 0;
if (radeon_ring_supports_scratch_reg(rdev, ring)) {
r = radeon_scratch_get(rdev, &ring->rptr_save_reg);
if (r) {
DRM_ERROR("failed to get scratch reg for rptr save (%d).\n", r);
ring->rptr_save_reg = 0;
}
}
}
@@ -2576,13 +2578,21 @@ void r600_fini(struct radeon_device *rdev)
void r600_ring_ib_execute(struct radeon_device *rdev, struct radeon_ib *ib)
{
struct radeon_ring *ring = &rdev->ring[ib->ring];
u32 next_rptr;
if (ring->rptr_save_reg) {
uint32_t next_rptr = ring->wptr + 3 + 4;
next_rptr = ring->wptr + 3 + 4;
radeon_ring_write(ring, PACKET3(PACKET3_SET_CONFIG_REG, 1));
radeon_ring_write(ring, ((ring->rptr_save_reg -
PACKET3_SET_CONFIG_REG_OFFSET) >> 2));
radeon_ring_write(ring, next_rptr);
} else if (rdev->wb.enabled) {
next_rptr = ring->wptr + 5 + 4;
radeon_ring_write(ring, PACKET3(PACKET3_MEM_WRITE, 3));
radeon_ring_write(ring, ring->next_rptr_gpu_addr & 0xfffffffc);
radeon_ring_write(ring, (upper_32_bits(ring->next_rptr_gpu_addr) & 0xff) | (1 << 18));
radeon_ring_write(ring, next_rptr);
radeon_ring_write(ring, 0);
}
radeon_ring_write(ring, PACKET3(PACKET3_INDIRECT_BUFFER, 2));