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drm/radeon: fix a semaphore deadlock on pre cayman asics 

The out of order execution of semaphore commands on
pre cayman asics doesn't work correctly and can
cause deadlocks, so turn it off for now.

Signed-off-by: Christian König <deathsimple@vodafone.de>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Christian König 2012-03-07 11:28:57 +01:00 committed by Dave Airlie
parent dac12d1f5e
commit 0be70439f2
2 changed files with 4 additions and 0 deletions
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3
drivers/gpu/drm/radeon/r600.c
View File

@ -2362,6 +2362,9 @@ void r600_semaphore_ring_emit(struct radeon_device *rdev,
uint64_t addr = semaphore->gpu_addr;
unsigned sel = emit_wait ? PACKET3_SEM_SEL_WAIT : PACKET3_SEM_SEL_SIGNAL;
if (rdev->family < CHIP_CAYMAN)
sel |= PACKET3_SEM_WAIT_ON_SIGNAL;
radeon_ring_write(ring, PACKET3(PACKET3_MEM_SEMAPHORE, 1));
radeon_ring_write(ring, addr & 0xffffffff);
radeon_ring_write(ring, (upper_32_bits(addr) & 0xff) | sel);

1
drivers/gpu/drm/radeon/r600d.h
View File

@ -831,6 +831,7 @@
#define PACKET3_STRMOUT_BUFFER_UPDATE 0x34
#define PACKET3_INDIRECT_BUFFER_MP 0x38
#define PACKET3_MEM_SEMAPHORE 0x39
# define PACKET3_SEM_WAIT_ON_SIGNAL (0x1 << 12)
# define PACKET3_SEM_SEL_SIGNAL (0x6 << 29)
# define PACKET3_SEM_SEL_WAIT (0x7 << 29)
#define PACKET3_MPEG_INDEX 0x3A