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drm/r600/kms: fixup number of loops per blit calculation. 

Some people were seeing
*ERROR* radeon: writting more dword to ring than expected
after certain blits, the loops calculation didn't take
into account that we do a separate blit for the remainder
after doing the aligned blits.

Acked-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2009-09-17 16:11:31 +10:00 committed by Dave Airlie
parent 41456df2d4
commit 7cbb355e94
1 changed files with 14 additions and 7 deletions
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21
drivers/gpu/drm/radeon/r600_blit_kms.c
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@ -548,10 +548,13 @@ void r600_vb_ib_put(struct radeon_device *rdev)
int r600_blit_prepare_copy(struct radeon_device *rdev, int size_bytes)
{
int r;
int ring_size;
int ring_size, line_size;
int max_size;
/* loops of emits 64 + fence emit possible */
int dwords_per_loop = 76;
int dwords_per_loop = 76, num_loops;
r = r600_vb_ib_get(rdev);
WARN_ON(r);
/* set_render_target emits 2 extra dwords on rv6xx */
if (rdev->family > CHIP_R600 && rdev->family < CHIP_RV770)
@ -559,14 +562,18 @@ int r600_blit_prepare_copy(struct radeon_device *rdev, int size_bytes)
/* 8 bpp vs 32 bpp for xfer unit */
if (size_bytes & 3)
max_size = 8192*8192;
line_size = 8192;
else
max_size = 8192*8192*4;
line_size = 8192*4;
r = r600_vb_ib_get(rdev);
WARN_ON(r);
max_size = 8192 * line_size;
ring_size = ((size_bytes + max_size) / max_size) * dwords_per_loop;
/* major loops cover the max size transfer */
num_loops = ((size_bytes + max_size) / max_size);
/* minor loops cover the extra non aligned bits */
num_loops += ((size_bytes % line_size) ? 1 : 0);
/* calculate number of loops correctly */
ring_size = num_loops * dwords_per_loop;
/* set default + shaders */
ring_size += 40; /* shaders + def state */
ring_size += 3; /* fence emit for VB IB */