drm/amdgpu: Enable SDMA_CNTL.ATC_L1_ENABLE for SDMA on CZ

For GFX context, the  ATC bit in SDMA*_GFX_VIRTUAL_ADDRESS  can be cleared
to perform in VM mode. For RLC context, to support ATC mode , ATC bit in
SDMA*_RLC*_VIRTUAL_ADDRESS should be set. SDMA_CNTL.ATC_L1_ENABLE bit is
global setting that enables the  L1-L2 translation for ATC address.

Signed-off-by: shaoyun liu <shaoyun.liu@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c

@@ -556,12 +556,18 @@ static void sdma_v3_0_ctx_switch_enable(struct amdgpu_device *adev, bool enable)
 
 	for (i = 0; i < adev->sdma.num_instances; i++) {
 		f32_cntl = RREG32(mmSDMA0_CNTL + sdma_offsets[i]);
-		if (enable)
+		if (enable) {
 			f32_cntl = REG_SET_FIELD(f32_cntl, SDMA0_CNTL,
 					AUTO_CTXSW_ENABLE, 1);
-		else
+			f32_cntl = REG_SET_FIELD(f32_cntl, SDMA0_CNTL,
+					ATC_L1_ENABLE, 1);
+		} else {
 			f32_cntl = REG_SET_FIELD(f32_cntl, SDMA0_CNTL,
 					AUTO_CTXSW_ENABLE, 0);
+			f32_cntl = REG_SET_FIELD(f32_cntl, SDMA0_CNTL,
+					ATC_L1_ENABLE, 1);
+		}
+
 		WREG32(mmSDMA0_CNTL + sdma_offsets[i], f32_cntl);
 	}
 }