drm/amdgpu:fix missing programing critical registers

those MC_VM registers won't be programed by VBIOS in VF
so driver is responsible to programe them.
Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c

@@ -53,6 +53,15 @@ int gfxhub_v1_0_gart_enable(struct amdgpu_device *adev)
 				mmMC_VM_SYSTEM_APERTURE_DEFAULT_ADDR_MSB),
 				(u32)(value >> 44));
 
+	if (amdgpu_sriov_vf(adev)) {
+		/* MC_VM_FB_LOCATION_BASE/TOP is NULL for VF, becuase they are VF copy registers so
+		vbios post doesn't program them, for SRIOV driver need to program them */
+		WREG32(SOC15_REG_OFFSET(GC, 0, mmMC_VM_FB_LOCATION_BASE),
+				adev->mc.vram_start >> 24);
+		WREG32(SOC15_REG_OFFSET(GC, 0, mmMC_VM_FB_LOCATION_TOP),
+				adev->mc.vram_end >> 24);
+	}
+
 	/* Disable AGP. */
 	WREG32(SOC15_REG_OFFSET(GC, 0, mmMC_VM_AGP_BASE), 0);
 	WREG32(SOC15_REG_OFFSET(GC, 0, mmMC_VM_AGP_TOP), 0);

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

@@ -382,7 +382,9 @@ static int gmc_v9_0_late_init(void *handle)
 static void gmc_v9_0_vram_gtt_location(struct amdgpu_device *adev,
 					struct amdgpu_mc *mc)
 {
-	u64 base = mmhub_v1_0_get_fb_location(adev);
+	u64 base = 0;
+	if (!amdgpu_sriov_vf(adev))
+		base = mmhub_v1_0_get_fb_location(adev);
 	amdgpu_vram_location(adev, &adev->mc, base);
 	adev->mc.gtt_base_align = 0;
 	amdgpu_gtt_location(adev, mc);

drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c

@@ -67,6 +67,15 @@ int mmhub_v1_0_gart_enable(struct amdgpu_device *adev)
 				mmMC_VM_SYSTEM_APERTURE_DEFAULT_ADDR_MSB),
 				(u32)(value >> 44));
 
+	if (amdgpu_sriov_vf(adev)) {
+		/* MC_VM_FB_LOCATION_BASE/TOP is NULL for VF, becuase they are VF copy registers so
+		vbios post doesn't program them, for SRIOV driver need to program them */
+		WREG32(SOC15_REG_OFFSET(MMHUB, 0, mmMC_VM_FB_LOCATION_BASE),
+			adev->mc.vram_start >> 24);
+		WREG32(SOC15_REG_OFFSET(MMHUB, 0, mmMC_VM_FB_LOCATION_TOP),
+			adev->mc.vram_end >> 24);
+	}
+
 	/* Disable AGP. */
 	WREG32(SOC15_REG_OFFSET(MMHUB, 0, mmMC_VM_AGP_BASE), 0);
 	WREG32(SOC15_REG_OFFSET(MMHUB, 0, mmMC_VM_AGP_TOP), 0);