drm/amdgpu: support query vram_info v3_0

vram_info table provides various vram information
including vram_vendor, vram_type, vram_width, etc.

v2: correct the calculation of vram_width
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Likun Gao <Likun.Gao@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -162,12 +162,14 @@ union vram_info {
 	struct atom_vram_info_header_v2_4 v24;
 	struct atom_vram_info_header_v2_5 v25;
 	struct atom_vram_info_header_v2_6 v26;
+	struct atom_vram_info_header_v3_0 v30;
 };
 
 union vram_module {
 	struct atom_vram_module_v9 v9;
 	struct atom_vram_module_v10 v10;
 	struct atom_vram_module_v11 v11;
+	struct atom_vram_module_v3_0 v30;
 };
 
 static int convert_atom_mem_type_to_vram_type(struct amdgpu_device *adev,
@@ -294,7 +296,28 @@ amdgpu_atomfirmware_get_vram_info(struct amdgpu_device *adev,
 			vram_info = (union vram_info *)
 				(mode_info->atom_context->bios + data_offset);
 			module_id = (RREG32(adev->bios_scratch_reg_offset + 4) & 0x00ff0000) >> 16;
+			if (frev == 3) {
+				switch (crev) {
+				/* v30 */
+				case 0:
+					vram_module = (union vram_module *)vram_info->v30.vram_module;
+					mem_vendor = (vram_module->v30.dram_vendor_id) & 0xF;
+					if (vram_vendor)
+						*vram_vendor = mem_vendor;
+					mem_type = vram_info->v30.memory_type;
+					if (vram_type)
+						*vram_type = convert_atom_mem_type_to_vram_type(adev, mem_type);
+					mem_channel_number = vram_info->v30.channel_num;
+					mem_channel_width = vram_info->v30.channel_width;
+					if (vram_width)
+						*vram_width = mem_channel_number * mem_channel_width;
+					break;
+				default:
+					return -EINVAL;
+				}
+			} else if (frev == 2) {
 				switch (crev) {
+				/* v23 */
 				case 3:
 					if (module_id > vram_info->v23.vram_module_num)
 						module_id = 0;
@@ -315,6 +338,7 @@ amdgpu_atomfirmware_get_vram_info(struct amdgpu_device *adev,
 					if (vram_vendor)
 						*vram_vendor = mem_vendor;
 					break;
+				/* v24 */
 				case 4:
 					if (module_id > vram_info->v24.vram_module_num)
 						module_id = 0;
@@ -335,6 +359,7 @@ amdgpu_atomfirmware_get_vram_info(struct amdgpu_device *adev,
 					if (vram_vendor)
 						*vram_vendor = mem_vendor;
 					break;
+				/* v25 */
 				case 5:
 					if (module_id > vram_info->v25.vram_module_num)
 						module_id = 0;
@@ -355,6 +380,7 @@ amdgpu_atomfirmware_get_vram_info(struct amdgpu_device *adev,
 					if (vram_vendor)
 						*vram_vendor = mem_vendor;
 					break;
+				/* v26 */
 				case 6:
 					if (module_id > vram_info->v26.vram_module_num)
 						module_id = 0;
@@ -378,6 +404,10 @@ amdgpu_atomfirmware_get_vram_info(struct amdgpu_device *adev,
 				default:
 					return -EINVAL;
 				}
+			} else {
+				/* invalid frev */
+				return -EINVAL;
+			}
 		}
 
 	}