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| author | Jani Nikula <jani.nikula@intel.com> | 2015-12-21 16:10:52 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2015-12-22 15:37:07 +0300 |
| commit | dd97950a4cb7218fac38570e2e12c57a2cfd8312 (patch) | |
| tree | fec2fe21d2a00d389439159f0c1e833449956abe /drivers/gpu/drm/i915/intel_bios.h | |
| parent | 0bff4858653312a10c83709e0009c3adb87e6f1e (diff) | |
| download | linux-dd97950a4cb7218fac38570e2e12c57a2cfd8312.tar.xz | |
drm/i915/bios: add proper documentation for the Video BIOS Table (VBT)
Add an overview and documentation for the VBT/BDB header structures.
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/3d826d4600688ca3518713776ab5bd8a8fc9f20f.1450702954.git.jani.nikula@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/intel_bios.h')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_bios.h | 38 |
1 files changed, 28 insertions, 10 deletions
diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h index 54eac1003a1e..2dc46a98c332 100644 --- a/drivers/gpu/drm/i915/intel_bios.h +++ b/drivers/gpu/drm/i915/intel_bios.h @@ -28,22 +28,40 @@ #ifndef _I830_BIOS_H_ #define _I830_BIOS_H_ +/** + * struct vbt_header - VBT Header structure + * @signature: VBT signature, always starts with "$VBT" + * @version: Version of this structure + * @header_size: Size of this structure + * @vbt_size: Size of VBT (VBT Header, BDB Header and data blocks) + * @vbt_checksum: Checksum + * @reserved0: Reserved + * @bdb_offset: Offset of &struct bdb_header from beginning of VBT + * @aim_offset: Offsets of add-in data blocks from beginning of VBT + */ struct vbt_header { - u8 signature[20]; /**< Always starts with 'VBT$' */ - u16 version; /**< decimal */ - u16 header_size; /**< in bytes */ - u16 vbt_size; /**< in bytes */ + u8 signature[20]; + u16 version; + u16 header_size; + u16 vbt_size; u8 vbt_checksum; u8 reserved0; - u32 bdb_offset; /**< from beginning of VBT */ - u32 aim_offset[4]; /**< from beginning of VBT */ + u32 bdb_offset; + u32 aim_offset[4]; } __packed; +/** + * struct bdb_header - BDB Header structure + * @signature: BDB signature "BIOS_DATA_BLOCK" + * @version: Version of the data block definitions + * @header_size: Size of this structure + * @bdb_size: Size of BDB (BDB Header and data blocks) + */ struct bdb_header { - u8 signature[16]; /**< Always 'BIOS_DATA_BLOCK' */ - u16 version; /**< decimal */ - u16 header_size; /**< in bytes */ - u16 bdb_size; /**< in bytes */ + u8 signature[16]; + u16 version; + u16 header_size; + u16 bdb_size; } __packed; /* strictly speaking, this is a "skip" block, but it has interesting info */ |