On Fri, 03 May 2024, Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx> wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> Define the contents of VBT block 4 (Mode Support List).
>
> Slightly crazy layout with a variable length list at the start,
> followed by the length of said list.
>
> No real idea what these "Intel mode numbers" really are. What
> I see in real world VBTs seems to be always the same list of
> 26 numbers, ranging between 0x30 and 0x84.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_vbt_defs.h | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_vbt_defs.h b/drivers/gpu/drm/i915/display/intel_vbt_defs.h
> index 7df0a6044425..c9ecf3b48999 100644
> --- a/drivers/gpu/drm/i915/display/intel_vbt_defs.h
> +++ b/drivers/gpu/drm/i915/display/intel_vbt_defs.h
> @@ -571,6 +571,15 @@ struct bdb_display_toggle {
> u16 list[]; /* ALM only */
> } __packed;
>
> +/*
> + * Block 4 - Mode Support List
> + */
> +
> +struct bdb_mode_support_list {
> + u8 intel_mode_number[0];
> + u16 mode_list_length;
> +} __packed;
> +
> /*
> * Block 9 - SRD Feature Block
> */
--
Jani Nikula, Intel
