diff mbox series

[10/35] drm/i915/bios: Define VBT block 4 (Mode Support List) contents

Message ID 20240503122449.27266-11-ville.syrjala@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series drm/i915/bios: Define (almost) all BDB blocks | expand

Commit Message

Ville Syrjala May 3, 2024, 12:24 p.m. UTC 
From: Ville Syrjälä <ville.syrjala@linux.intel.com>

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@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_vbt_defs.h | 9 +++++++++
 1 file changed, 9 insertions(+)

Comments

Jani Nikula May 6, 2024, 9:24 a.m. UTC | #1 
On Fri, 03 May 2024, Ville Syrjala <ville.syrjala@linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> 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@linux.intel.com>

Reviewed-by: Jani Nikula <jani.nikula@intel.com>

> ---
>  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
>   */
diff mbox series

Patch

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
  */