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drm/amdgpu: Fix SDMA UTC_L1 handling during start/stop sequences

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This commit makes two key fixes to SDMA v4.4.2 handling:

1. disable UTC_L1 in sdma_cntl register when stopping SDMA engines
   by reading the current value before modifying UTC_L1_ENABLE bit.

2. Ensure UTC_L1_ENABLE is consistently managed by:
   - Adding the missing register write when enabling UTC_L1 during start
   - Keeping UTC_L1 enabled by default as per hardware requirements

v2: Correct SDMA_CNTL setting (Philip)

Suggested-by: Jonathan Kim <jonathan.kim@amd.com>
Signed-off-by: Jesse Zhang <Jesse.Zhang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jesse Zhang 2025-06-16 19:21:41 +08:00 committed by Alex Deucher
parent 1ab11a8268
commit 375bf56465
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
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@ -492,7 +492,7 @@ static void sdma_v4_4_2_inst_gfx_stop(struct amdgpu_device *adev,
{
struct amdgpu_ring *sdma[AMDGPU_MAX_SDMA_INSTANCES];
u32 doorbell_offset, doorbell;
u32 rb_cntl, ib_cntl;
u32 rb_cntl, ib_cntl, sdma_cntl;
int i;
for_each_inst(i, inst_mask) {
@ -504,6 +504,9 @@ static void sdma_v4_4_2_inst_gfx_stop(struct amdgpu_device *adev,
ib_cntl = RREG32_SDMA(i, regSDMA_GFX_IB_CNTL);
ib_cntl = REG_SET_FIELD(ib_cntl, SDMA_GFX_IB_CNTL, IB_ENABLE, 0);
WREG32_SDMA(i, regSDMA_GFX_IB_CNTL, ib_cntl);
sdma_cntl = RREG32_SDMA(i, regSDMA_CNTL);
sdma_cntl = REG_SET_FIELD(sdma_cntl, SDMA_CNTL, UTC_L1_ENABLE, 0);
WREG32_SDMA(i, regSDMA_CNTL, sdma_cntl);
if (sdma[i]->use_doorbell) {
doorbell = RREG32_SDMA(i, regSDMA_GFX_DOORBELL);
@ -997,6 +1000,7 @@ static int sdma_v4_4_2_inst_start(struct amdgpu_device *adev,
/* set utc l1 enable flag always to 1 */
temp = RREG32_SDMA(i, regSDMA_CNTL);
temp = REG_SET_FIELD(temp, SDMA_CNTL, UTC_L1_ENABLE, 1);
WREG32_SDMA(i, regSDMA_CNTL, temp);
if (amdgpu_ip_version(adev, SDMA0_HWIP, 0) < IP_VERSION(4, 4, 5)) {
/* enable context empty interrupt during initialization */