drm/amdgpu/gmc10: set gart size and vm size for navi12

Same as other navi asics.
Signed-off-by: Xiaojie Yuan <xiaojie.yuan@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c

@@ -525,6 +525,7 @@ static int gmc_v10_0_mc_init(struct amdgpu_device *adev)
 		switch (adev->asic_type) {
 		case CHIP_NAVI10:
 		case CHIP_NAVI14:
+		case CHIP_NAVI12:
 		default:
 			adev->gmc.gart_size = 512ULL << 20;
 			break;
@@ -603,10 +604,11 @@ static int gmc_v10_0_sw_init(void *handle)
 	switch (adev->asic_type) {
 	case CHIP_NAVI10:
 	case CHIP_NAVI14:
+	case CHIP_NAVI12:
 		adev->num_vmhubs = 2;
 		/*
 		 * To fulfill 4-level page support,
-		 * vm size is 256TB (48bit), maximum size of Navi10/Navi14,
+		 * vm size is 256TB (48bit), maximum size of Navi10/Navi14/Navi12,
 		 * block size 512 (9bit)
 		 */
 		amdgpu_vm_adjust_size(adev, 256 * 1024, 9, 3, 48);
@@ -721,6 +723,7 @@ static void gmc_v10_0_init_golden_registers(struct amdgpu_device *adev)
 	switch (adev->asic_type) {
 	case CHIP_NAVI10:
 	case CHIP_NAVI14:
+	case CHIP_NAVI12:
 		break;
 	default:
 		break;