drm/amdgpu/atomfirmware: implement vram_width for APUs
Implement support using the new atomfirmware system info table.
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c
index 9ddfe34..a7d65f0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c
@@ -95,3 +95,36 @@ int amdgpu_atomfirmware_allocate_fb_scratch(struct amdgpu_device *adev)
ctx->scratch_size_bytes = usage_bytes;
return 0;
}
+
+union igp_info {
+ struct atom_integrated_system_info_v1_11 v11;
+};
+
+/*
+ * Return vram width from integrated system info table, if available,
+ * or 0 if not.
+ */
+int amdgpu_atomfirmware_get_vram_width(struct amdgpu_device *adev)
+{
+ struct amdgpu_mode_info *mode_info = &adev->mode_info;
+ int index = get_index_into_master_table(atom_master_list_of_data_tables_v2_1,
+ integratedsysteminfo);
+ u16 data_offset, size;
+ union igp_info *igp_info;
+ u8 frev, crev;
+
+ /* get any igp specific overrides */
+ if (amdgpu_atom_parse_data_header(mode_info->atom_context, index, &size,
+ &frev, &crev, &data_offset)) {
+ igp_info = (union igp_info *)
+ (mode_info->atom_context->bios + data_offset);
+ switch (crev) {
+ case 11:
+ return igp_info->v11.umachannelnumber * 64;
+ default:
+ return 0;
+ }
+ }
+
+ return 0;
+}