[PATCH AUTOSEL 4.9 05/12] drm/amdgpu: perform srbm soft reset always on SDMA resume

[Sasha Levin]

From: Evan Quan <evan.q...@amd.com>

[ Upstream commit 253475c455eb5f8da34faa1af92709e7bb414624 ]

This can address the random SDMA hang after pci config reset
seen on Hawaii.

Signed-off-by: Evan Quan <evan.q...@amd.com>
Tested-by: Sandeep Raghuraman <sandy.8...@gmail.com>
Reviewed-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/gpu/drm/amd/amdgpu/cik_sdma.c | 27 ++++++++++++---------------
 1 file changed, 12 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/cik_sdma.c 
b/drivers/gpu/drm/amd/amdgpu/cik_sdma.c
index cb952acc71339..2934443fbd4dc 100644
--- a/drivers/gpu/drm/amd/amdgpu/cik_sdma.c
+++ b/drivers/gpu/drm/amd/amdgpu/cik_sdma.c
@@ -1053,22 +1053,19 @@ static int cik_sdma_soft_reset(void *handle)
 {
        u32 srbm_soft_reset = 0;
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;
-       u32 tmp = RREG32(mmSRBM_STATUS2);
+       u32 tmp;
 
-       if (tmp & SRBM_STATUS2__SDMA_BUSY_MASK) {
-               /* sdma0 */
-               tmp = RREG32(mmSDMA0_F32_CNTL + SDMA0_REGISTER_OFFSET);
-               tmp |= SDMA0_F32_CNTL__HALT_MASK;
-               WREG32(mmSDMA0_F32_CNTL + SDMA0_REGISTER_OFFSET, tmp);
-               srbm_soft_reset |= SRBM_SOFT_RESET__SOFT_RESET_SDMA_MASK;
-       }
-       if (tmp & SRBM_STATUS2__SDMA1_BUSY_MASK) {
-               /* sdma1 */
-               tmp = RREG32(mmSDMA0_F32_CNTL + SDMA1_REGISTER_OFFSET);
-               tmp |= SDMA0_F32_CNTL__HALT_MASK;
-               WREG32(mmSDMA0_F32_CNTL + SDMA1_REGISTER_OFFSET, tmp);
-               srbm_soft_reset |= SRBM_SOFT_RESET__SOFT_RESET_SDMA1_MASK;
-       }
+       /* sdma0 */
+       tmp = RREG32(mmSDMA0_F32_CNTL + SDMA0_REGISTER_OFFSET);
+       tmp |= SDMA0_F32_CNTL__HALT_MASK;
+       WREG32(mmSDMA0_F32_CNTL + SDMA0_REGISTER_OFFSET, tmp);
+       srbm_soft_reset |= SRBM_SOFT_RESET__SOFT_RESET_SDMA_MASK;
+
+       /* sdma1 */
+       tmp = RREG32(mmSDMA0_F32_CNTL + SDMA1_REGISTER_OFFSET);
+       tmp |= SDMA0_F32_CNTL__HALT_MASK;
+       WREG32(mmSDMA0_F32_CNTL + SDMA1_REGISTER_OFFSET, tmp);
+       srbm_soft_reset |= SRBM_SOFT_RESET__SOFT_RESET_SDMA1_MASK;
 
        if (srbm_soft_reset) {
                tmp = RREG32(mmSRBM_SOFT_RESET);
-- 
2.27.0

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