drm/radeon: SDMA fix hibernation (CI GPU family).

In order for hibernation to reliably work we need to properly turn
off the SDMA block, sadly after numerous attemps i haven't not found
proper sequence for clean and full shutdown. So simply reset both
SDMA block, this makes hibernation works reliably on sea island GPU
family (CI)

Hibernation and suspend to ram were tested (several times) on :
Bonaire
Hawaii
Mullins
Kaveri
Kabini

Cc: stable@vger.kernel.org
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/cik_sdma.c b/drivers/gpu/drm/radeon/cik_sdma.c
index f86eb54e7763d65341006c4ff25f4e8f8076760c..d16f2eebd95e6b2df5412d072023a89d43d32ae2 100644 (file)
--- a/drivers/gpu/drm/radeon/cik_sdma.c
+++ b/drivers/gpu/drm/radeon/cik_sdma.c
@@ -268,6 +268,17 @@ static void cik_sdma_gfx_stop(struct radeon_device *rdev)
        }
        rdev->ring[R600_RING_TYPE_DMA_INDEX].ready = false;
        rdev->ring[CAYMAN_RING_TYPE_DMA1_INDEX].ready = false;
+
+       /* FIXME use something else than big hammer but after few days can not
+        * seem to find good combination so reset SDMA blocks as it seems we
+        * do not shut them down properly. This fix hibernation and does not
+        * affect suspend to ram.
+        */
+       WREG32(SRBM_SOFT_RESET, SOFT_RESET_SDMA | SOFT_RESET_SDMA1);
+       (void)RREG32(SRBM_SOFT_RESET);
+       udelay(50);
+       WREG32(SRBM_SOFT_RESET, 0);
+       (void)RREG32(SRBM_SOFT_RESET);
 }
 
 /**