[PATCH 17/23] drm/amdgpu: Make UTCL2 snoop CPU caches

[Alex Deucher]

From: Rajneesh Bhardwaj <rajneesh.bhardwaj at amd.com>

On AMD APP APUs, to make UTCL2 snoop CPU caches, its not sufficient to
rely on xgmi connected flag so add the logic to use is_app_apu to
program the PDE_REQUEST_PHYSICAL bit correctly for gfxhub and mmhub
both.

Reviewed-by: Felix Kuehling <Felix.Kuehling at amd.com>
Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfxhub_v1_2.c | 3 ++-
 drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c  | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_2.c b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_2.c
index 8ba59ffe0e9f..8901e73fd700 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_2.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_2.c
@@ -252,7 +252,8 @@ static void gfxhub_v1_2_xcc_init_cache_regs(struct amdgpu_device *adev,
 		WREG32_SOC15_RLC(GC, GET_INST(GC, i), regVM_L2_CNTL3, tmp);
 
 		tmp = regVM_L2_CNTL4_DEFAULT;
-		if (adev->gmc.xgmi.connected_to_cpu) {
+		/* For AMD APP APUs setup WC memory */
+		if (adev->gmc.xgmi.connected_to_cpu || adev->gmc.is_app_apu) {
 			tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4, VMC_TAP_PDE_REQUEST_PHYSICAL, 1);
 			tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4, VMC_TAP_PTE_REQUEST_PHYSICAL, 1);
 		} else {
diff --git a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c
index a530e2a3cc28..a8faf66b6878 100644
--- a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c
+++ b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c
@@ -257,7 +257,8 @@ static void mmhub_v1_8_init_cache_regs(struct amdgpu_device *adev)
 		WREG32_SOC15(MMHUB, i, regVM_L2_CNTL3, tmp);
 
 		tmp = regVM_L2_CNTL4_DEFAULT;
-		if (adev->gmc.xgmi.connected_to_cpu) {
+		/* For AMD APP APUs setup WC memory */
+		if (adev->gmc.xgmi.connected_to_cpu || adev->gmc.is_app_apu) {
 			tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4,
 					    VMC_TAP_PDE_REQUEST_PHYSICAL, 1);
 			tmp = REG_SET_FIELD(tmp, VM_L2_CNTL4,
-- 
2.39.2