[alsa-devel] [PATCH RFC 07/11] drm/edid: add function to help find SADs

[Jani Nikula]

On Mon, 30 Mar 2015, Russell King <rmk+kernel at arm.linux.org.uk> wrote:
> Add a function to find the start of the SADs in the ELD.  This
> complements the helper to retrieve the SAD count.
>
> Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk>

I guess version 31 is specific enough to warrant a #define of its own,
but meh.

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

> ---
>  include/drm/drm_edid.h | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>
> diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
> index 87d85e81d3a7..c44ad513e0f7 100644
> --- a/include/drm/drm_edid.h
> +++ b/include/drm/drm_edid.h
> @@ -346,6 +346,25 @@ static inline int drm_eld_mnl(const uint8_t *eld)
>  }
>  
>  /**
> + * drm_eld_sad - Get ELD SAD structures.
> + * @eld: pointer to an eld memory structure with sad_count set
> + */
> +static inline const uint8_t *drm_eld_sad(const uint8_t *eld)
> +{
> +	unsigned int ver, mnl;
> +
> +	ver = (eld[DRM_ELD_VER] & DRM_ELD_VER_MASK) >> DRM_ELD_VER_SHIFT;
> +	if (ver != 2 && ver != 31)
> +		return NULL;
> +
> +	mnl = drm_eld_mnl(eld);
> +	if (mnl > 16)
> +		return NULL;
> +
> +	return eld + DRM_ELD_CEA_SAD(mnl, 0);
> +}
> +
> +/**
>   * drm_eld_sad_count - Get ELD SAD count.
>   * @eld: pointer to an eld memory structure with sad_count set
>   */
> -- 
> 1.8.3.1
>
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-- 
Jani Nikula, Intel Open Source Technology Center