Am 20.06.23 um 15:29 schrieb Horace Chen:
[Why]
VCN will use some framebuffer space as its cache. It needs to
be reset when reset happens, such as FLR. Otherwise some error
may be kept after the reset.
Well this doesn't make sense at all.
The full content of adev->vcn.inst[i].cpu_addr is saved and restored
during suspend/resume and IIRC GPU resets as well.
See functions amdgpu_vcn_suspend() and amdgpu_vcn_resume().
Please let Leo's team take a look at this and review the change before
it is committed.
Regards,
Christian.
Signed-off-by: Horace Chen <horace.chen@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c b/drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c
index b48bb5212488..2db73a964031 100644
--- a/drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c
@@ -1292,6 +1292,7 @@ static int vcn_v4_0_start_sriov(struct amdgpu_device *adev)
cache_size);
cache_addr = adev->vcn.inst[i].gpu_addr + offset;
+ memset(adev->vcn.inst[i].cpu_addr + offset, 0, AMDGPU_VCN_STACK_SIZE);
MMSCH_V4_0_INSERT_DIRECT_WT(SOC15_REG_OFFSET(VCN, i,
regUVD_LMI_VCPU_CACHE1_64BIT_BAR_LOW),
lower_32_bits(cache_addr));
@@ -1307,6 +1308,8 @@ static int vcn_v4_0_start_sriov(struct amdgpu_device *adev)
cache_addr = adev->vcn.inst[i].gpu_addr + offset +
AMDGPU_VCN_STACK_SIZE;
+ memset(adev->vcn.inst[i].cpu_addr + offset + AMDGPU_VCN_STACK_SIZE, 0,
+ AMDGPU_VCN_STACK_SIZE);
MMSCH_V4_0_INSERT_DIRECT_WT(SOC15_REG_OFFSET(VCN, i,
regUVD_LMI_VCPU_CACHE2_64BIT_BAR_LOW),
lower_32_bits(cache_addr));
