[PATCH 01/19] drm/edid: reset display info in drm_add_edid_modes() for NULL edid

[Ville Syrjälä]

On Thu, Apr 14, 2022 at 06:06:44PM +0300, Jani Nikula wrote:
> If a NULL edid gets passed to drm_add_edid_modes(), we should probably
> also reset the display info.

One concern I had with this is resetting of eg. {width,height}_mm
which might have been populated by intel_panel_add_fixed_mode().
But I think that might already happen anyway through one of the
other codepaths that call drm_reset_display_info() so probably not
something that is made any worse by this patch.

IIRC at one point I tried to startd cleaning up the display_info
mess a bit but the patches got stuck in some silly bikeshed
so I gave up.

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> 
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>
> ---
>  drivers/gpu/drm/drm_edid.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 324ce8467915..4758e78fad82 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -5721,6 +5721,7 @@ static int drm_edid_connector_update(struct drm_connector *connector,
>  	u32 quirks;
>  
>  	if (edid == NULL) {
> +		drm_reset_display_info(connector);
>  		clear_eld(connector);
>  		return 0;
>  	}
> -- 
> 2.30.2

-- 
Ville Syrjälä
Intel