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Commit 21f6bcb6 authored by Alex Deucher's avatar Alex Deucher
Browse files

drm/amdgpu/atomfirmware: implement vram_width for APUs 



Implement support using the new atomfirmware system info table.

Reviewed-by: default avatarHawking Zhang <Hawking.Zhang@amd.com>
Acked-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 6c885554

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

+33 −0
Original line number Diff line number Diff line
@@ -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;

}

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

+1 −0
Original line number Diff line number Diff line
@@ -27,5 +27,6 @@ 
bool amdgpu_atomfirmware_gpu_supports_virtualization(struct amdgpu_device *adev);

void amdgpu_atomfirmware_scratch_regs_init(struct amdgpu_device *adev);

int amdgpu_atomfirmware_allocate_fb_scratch(struct amdgpu_device *adev);

int amdgpu_atomfirmware_get_vram_width(struct amdgpu_device *adev);



#endif