[PATCH 1/3] drm/edid: new drm_edid_block_checksum helper function

[Jani Nikula]

On Thu, 20 Nov 2014, Stefan Brüns <stefan.bruens at rwth-aachen.de> wrote:
> The function will also be used by a later patch, so factor it out.
>
> Signed-off-by: Stefan Brüns <stefan.bruens at rwth-aachen.de>
> ---
>  drivers/gpu/drm/drm_edid.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index ec4f91f..b072041 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -1048,8 +1048,7 @@ bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid)
>  		}
>  	}
>  
> -	for (i = 0; i < EDID_LENGTH; i++)
> -		csum += raw_edid[i];
> +	csum = drm_edid_block_checksum(raw_edid);

With this change, it's no longer necessary to initialize csum to 0 in
drm_edid_block_valid.

>  	if (csum) {
>  		if (print_bad_edid) {
>  			DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
> @@ -1188,6 +1187,17 @@ static bool drm_edid_is_zero(u8 *in_edid, int length)
>  	return true;
>  }
>  
> +static u8
> +drm_edid_block_checksum(u8 *raw_edid)

const u8 *raw_edid, please.

Those fixed,

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


> +{
> +	int i;
> +	u8 csum = 0;
> +	for (i = 0; i < EDID_LENGTH; i++)
> +		csum += raw_edid[i];
> +
> +	return csum;
> +}
> +
>  static u8 *
>  drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
>  {
> -- 
> 2.1.2
>
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-- 
Jani Nikula, Intel Open Source Technology Center