From: Oak Zeng Date: Mon, 7 Oct 2019 20:32:23 +0000 (-0500) Subject: drm/amdgpu: Enable gfx cache probing on HDP write for arcturus X-Git-Tag: v5.5-rc1~128^2~25^2~150 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=f81b86a043270eb5f7e3a80354bea88d0b43ff6f;p=linux.git drm/amdgpu: Enable gfx cache probing on HDP write for arcturus This allows gfx cache to be probed and invalidated (for none-dirty cache lines) on a HDP write (from either another GPU or CPU). This should work only for the memory mapped as RW memory type newly added for arcturus, to achieve some cache coherence b/t multiple memory clients. Signed-off-by: Oak Zeng Acked-by: Christian Konig Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c index 12bbccdd9d1c..9f2a893871ec 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c @@ -1194,6 +1194,9 @@ static int gmc_v9_0_hw_init(void *handle) /* TODO for renoir */ mmhub_v1_0_update_power_gating(adev, true); break; + case CHIP_ARCTURUS: + WREG32_FIELD15(HDP, 0, HDP_MMHUB_CNTL, HDP_MMHUB_GCC, 1); + break; default: break; }