diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c index 8e8d712f5a6e..241a4e57cf4a 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c @@ -136,6 +136,14 @@ static int gmc_v10_0_process_interrupt(struct amdgpu_device *adev, addr |= ((u64)entry->src_data[1] & 0xf) << 44; if (!amdgpu_sriov_vf(adev)) { + /* + * Issue a dummy read to wait for the status register to + * be updated to avoid reading an incorrect value due to + * the new fast GRBM interface. + */ + if (entry->vmid_src == AMDGPU_GFXHUB_0) + RREG32(hub->vm_l2_pro_fault_status); + status = RREG32(hub->vm_l2_pro_fault_status); WREG32_P(hub->vm_l2_pro_fault_cntl, 1, ~1); } @@ -229,6 +237,13 @@ static void gmc_v10_0_flush_vm_hub(struct amdgpu_device *adev, uint32_t vmid, WREG32_NO_KIQ(hub->vm_inv_eng0_req + eng, tmp); + /* + * Issue a dummy read to wait for the ACK register to be cleared + * to avoid a false ACK due to the new fast GRBM interface. + */ + if (vmhub == AMDGPU_GFXHUB_0) + RREG32_NO_KIQ(hub->vm_inv_eng0_req + eng); + /* Wait for ACK with a delay.*/ for (i = 0; i < adev->usec_timeout; i++) { tmp = RREG32_NO_KIQ(hub->vm_inv_eng0_ack + eng); |