drm/amdgpu: Keep non-psp path for partition switch

When PSP block is not present, use direct programming.
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Acked-by: Mangesh Gadre <Mangesh.Gadre@amd.com>
Tested-by: Mangesh Gadre <Mangesh.Gadre@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c

@@ -623,12 +623,28 @@ static void gfx_v9_4_3_select_me_pipe_q(struct amdgpu_device *adev,
 static int gfx_v9_4_3_switch_compute_partition(struct amdgpu_device *adev,
 						int num_xccs_per_xcp)
 {
-	int ret;
-
-	ret = psp_spatial_partition(&adev->psp, NUM_XCC(adev->gfx.xcc_mask) /
-							num_xccs_per_xcp);
-	if (ret)
-		return ret;
+	int ret, i, num_xcc;
+	u32 tmp = 0;
+
+	if (adev->psp.funcs) {
+		ret = psp_spatial_partition(&adev->psp,
+					    NUM_XCC(adev->gfx.xcc_mask) /
+						    num_xccs_per_xcp);
+		if (ret)
+			return ret;
+	} else {
+		num_xcc = NUM_XCC(adev->gfx.xcc_mask);
+
+		for (i = 0; i < num_xcc; i++) {
+			tmp = REG_SET_FIELD(tmp, CP_HYP_XCP_CTL, NUM_XCC_IN_XCP,
+					    num_xccs_per_xcp);
+			tmp = REG_SET_FIELD(tmp, CP_HYP_XCP_CTL, VIRTUAL_XCC_ID,
+					    i % num_xccs_per_xcp);
+			WREG32_SOC15(GC, GET_INST(GC, i), regCP_HYP_XCP_CTL,
+				     tmp);
+		}
+		ret = 0;
+	}
 
 	adev->gfx.num_xcc_per_xcp = num_xccs_per_xcp;