issue: the UMC h/w bug is that when MCLK is doing the switch in the middle of a page access being preempted by high priority client (e.g. DISPLAY) then UMC and the mclk switch would stuck there due to deadlock how: fixed by disabling auto PreChg for UMC to avoid high priority client preempting other client's access on the same page, thus the deadlock could be avoided Signed-off-by: Monk Liu <Monk.Liu@xxxxxxx> Change-Id: Iaf6eb2a20a4785ec8440e64d5e0cae67aa0603da --- drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c index 6102dea..8271b0c 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c @@ -1306,6 +1306,24 @@ static int gmc_v9_0_gart_enable(struct amdgpu_device *adev) (unsigned)(adev->gmc.gart_size >> 20), (unsigned long long)amdgpu_bo_gpu_offset(adev->gart.bo)); adev->gart.ready = true; + + /* disable auto Pchg is a w/a for the vega10 UMC hardware bug */ + WREG32(0x5010c/4, 0x1002); + WREG32(0x5210c/4, 0x1002); + WREG32(0x5410c/4, 0x1002); + WREG32(0x5610c/4, 0x1002); + WREG32(0x15010c/4, 0x1002); + WREG32(0x15210c/4, 0x1002); + WREG32(0x15410c/4, 0x1002); + WREG32(0x15610c/4, 0x1002); + WREG32(0x25010c/4, 0x1002); + WREG32(0x25210c/4, 0x1002); + WREG32(0x25410c/4, 0x1002); + WREG32(0x25610c/4, 0x1002); + WREG32(0x35010c/4, 0x1002); + WREG32(0x35210c/4, 0x1002); + WREG32(0x35410c/4, 0x1002); + WREG32(0x35610c/4, 0x1002); return 0; } -- 2.7.4 _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
