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>

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index fbcd84803b60375b74c87b8e88df4caabf92b333..17ca72ce30277332965fa7772884a93764c0664a 100644 (file)
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -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);

diff --git a/drivers/gpu/drm/radeon/r600d.h b/drivers/gpu/drm/radeon/r600d.h
index 3ee1fd7ef3947d1f624ae8a059d9c511ea15eead..9b23670716f1fa4241ca6cd1cbd6d6186a832049 100644 (file)
--- a/drivers/gpu/drm/radeon/r600d.h
+++ b/drivers/gpu/drm/radeon/r600d.h
@@ -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