[PATCH AUTOSEL 4.19 07/21] drm/amdgpu: perform srbm soft reset always on SDMA resume

From: Sasha Levin
Date: Mon Nov 09 2020 - 23:00:51 EST


From: Evan Quan <evan.quan@xxxxxxx>

[ Upstream commit 253475c455eb5f8da34faa1af92709e7bb414624 ]

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

Signed-off-by: Evan Quan <evan.quan@xxxxxxx>
Tested-by: Sandeep Raghuraman <sandy.8925@xxxxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 d0fa2aac23888..ca66c2f797584 100644
--- a/drivers/gpu/drm/amd/amdgpu/cik_sdma.c
+++ b/drivers/gpu/drm/amd/amdgpu/cik_sdma.c
@@ -1086,22 +1086,19 @@ 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