Subject: Re: [PATCH v1 01/16] drm/bridge: tc358767: fix opencoded use of drm_panel_*

From: Philipp Zabel <[email-masked]>
Date: Mon, 05 Aug 2019 11:35:56 +0200

On Sun, 2019-08-04 at 22:16 +0200, Sam Ravnborg wrote:
> Replace open coded version with call to drm_panel_get_modes().
> 
> Signed-off-by: Sam Ravnborg <[email-masked]>
> Cc: Andrzej Hajda <[email-masked]>
> Cc: Neil Armstrong <[email-masked]>
> Cc: Laurent Pinchart <[email-masked]>
> Cc: Jonas Karlman <[email-masked]>
> Cc: Jernej Skrabec <[email-masked]>
> ---
>  drivers/gpu/drm/bridge/tc358767.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
> index 42f03a985ac0..cebc8e620820 100644
> --- a/drivers/gpu/drm/bridge/tc358767.c
> +++ b/drivers/gpu/drm/bridge/tc358767.c
> @@ -1312,7 +1312,7 @@ static int tc_connector_get_modes(struct drm_connector *connector)
>  {
>  	struct tc_data *tc = connector_to_tc(connector);
>  	struct edid *edid;
> -	unsigned int count;
> +	int count;

This looks like it also fixes a potential bug ...

>  	int ret;
>  
>  	ret = tc_get_display_props(tc);
> @@ -1321,11 +1321,9 @@ static int tc_connector_get_modes(struct drm_connector *connector)
>  		return 0;
>  	}
>  
> -	if (tc->panel && tc->panel->funcs && tc->panel->funcs->get_modes) {
> -		count = tc->panel->funcs->get_modes(tc->panel);
> -		if (count > 0)

... when .get_modes returns a negative value.

> -			return count;
> -	}
> +	count = drm_panel_get_modes(tc->panel);
> +	if (count > 0)
> +		return count;
>  
>  	edid = drm_get_edid(connector, &tc->aux.ddc);

Reviewed-by: Philipp Zabel <[email-masked]>

regards
Philipp

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