Revert "drm/radeon: disable CIK CP semaphores for now"

This reverts commit 99b4f25122f43210278cde17a9d100906235a074.

Semaphores work fine after further review and testing.
Cc: 3.13 <stable@vger.kernel.org> # 3.13

diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index e7f6334138a103ef4e19156d9da8b4e376d30ee4..dc6d5f58018d310f469072ceda392a8ffe1cf993 100644 (file)
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -3566,8 +3566,6 @@ bool cik_semaphore_ring_emit(struct radeon_device *rdev,
                             struct radeon_semaphore *semaphore,
                             bool emit_wait)
 {
-/* TODO: figure out why semaphore cause lockups */
-#if 0
        uint64_t addr = semaphore->gpu_addr;
        unsigned sel = emit_wait ? PACKET3_SEM_SEL_WAIT : PACKET3_SEM_SEL_SIGNAL;
 
@@ -3576,9 +3574,6 @@ bool cik_semaphore_ring_emit(struct radeon_device *rdev,
        radeon_ring_write(ring, (upper_32_bits(addr) & 0xffff) | sel);
 
        return true;
-#else
-       return false;
-#endif
 }
 
 /**