Re: [PATCH v2 2/3] drm/bridge/lontium-lt9611uxc: fix get_edid return code

From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
	Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
	Andrzej Hajda <a.hajda@samsung.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Jonas Karlman <jonas@kwiboo.se>,
	Jernej Skrabec <jernej.skrabec@siol.net>,
	Vinod Koul <vkoul@kernel.org>, Sam Ravnborg <sam@ravnborg.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Subject: Re: [PATCH v2 2/3] drm/bridge/lontium-lt9611uxc: fix get_edid return code
Date: Fri, 15 Jan 2021 08:59:07 -0600	[thread overview]
Message-ID: <YAGtu9GYuphys1GF@builder.lan> (raw)
In-Reply-To: <20210115110225.127075-3-dmitry.baryshkov@linaro.org>

On Fri 15 Jan 05:02 CST 2021, Dmitry Baryshkov wrote:

> Return NULL pointer from get_edid() callback rather than ERR_PTR()
> pointer, as DRM code does NULL checks rather than IS_ERR(). Also while
> we are at it, return NULL if getting EDID timed out.
> 

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> Fixes: 0cbbd5b1a012 ("drm: bridge: add support for lontium LT9611UXC bridge")
> ---
>  drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> index a59e811f1705..b708700e182d 100644
> --- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> +++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> @@ -505,7 +505,10 @@ static struct edid *lt9611uxc_bridge_get_edid(struct drm_bridge *bridge,
>  	ret = lt9611uxc_wait_for_edid(lt9611uxc);
>  	if (ret < 0) {
>  		dev_err(lt9611uxc->dev, "wait for EDID failed: %d\n", ret);
> -		return ERR_PTR(ret);
> +		return NULL;
> +	} else if (ret == 0) {
> +		dev_err(lt9611uxc->dev, "wait for EDID timeout\n");
> +		return NULL;
>  	}
>  
>  	return drm_do_get_edid(connector, lt9611uxc_get_edid_block, lt9611uxc);
> -- 
> 2.29.2
> 