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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>
This commit is contained in:
Alex Deucher 2017-07-05 15:26:48 -04:00
parent 6c88555414
commit 21f6bcb6d4
2 changed files with 34 additions and 0 deletions
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33
drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.c
View File

@ -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;
}

1
drivers/gpu/drm/amd/amdgpu/amdgpu_atomfirmware.h
View File

@ -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