[PATCH] drm: Silence zero EDID carping

[Ville Syrjälä]

On Thu, Oct 29, 2020 at 11:00:30AM +0000, Chris Wilson wrote:
> We have a few displays in CI that always report their EDID as a bunch of
> zeroes. This is consistent behavioud, so one assumes intentional
> indication of an "absent" EDID. Let us treat is as such by silently
> reporting the zero edid using connector->null_edid_counter, leaving the
> loud carp to EDID that violate their checksums or otherwise return
> unexpected illegal data upon reading. These are more likely to be
> inconsistent bad connections rather than being intended.

I don't think null_edid_counter is actually used by anything.
So apart from wondering why the mode list has turned strange
is there some way I can still see from the logs that the
EDID has become all zeroes?

> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---
>  drivers/gpu/drm/drm_edid.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 631125b46e04..94549805a204 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -1951,7 +1951,7 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
>  			break;
>  		if (i == 0 && drm_edid_is_zero(edid, EDID_LENGTH)) {
>  			connector->null_edid_counter++;
> -			goto carp;
> +			goto out;
>  		}
>  	}
>  	if (i == 4)
> -- 
> 2.20.1
> 
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-- 
Ville Syrjälä
Intel