linux-kernel - Re: [PATCH 6/9] drm/bridge: tc358767: Simplify error check in tc_aux_linx

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Message-ID: <20190304123300.GH6325@pendragon.ideasonboard.com>
Date:   Mon, 4 Mar 2019 14:33:00 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     dri-devel@...ts.freedesktop.org,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/9] drm/bridge: tc358767: Simplify error check in
 tc_aux_linx_setup()

Hi Andrey,

Thank you for the patch.

On Tue, Feb 26, 2019 at 11:36:06AM -0800, Andrey Smirnov wrote:
> Tc_poll_timeout() can only return -ETIMEDOUT, so checking for other
> errors is not necessary. Drop it. No functional change intended.

Is that true given patch 1/9 in this series ? regmap_read_poll_timeout()
can also return an error from regmap_read().

> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Cc: Archit Taneja <architt@...eaurora.org>
> Cc: Andrzej Hajda <a.hajda@...sung.com>
> Cc: Laurent Pinchart <Laurent.pinchart@...asonboard.com>
> Cc: Chris Healy <cphealy@...il.com>
> Cc: Lucas Stach <l.stach@...gutronix.de>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  drivers/gpu/drm/bridge/tc358767.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
> index ea30cec4a0c3..54ff95f66e30 100644
> --- a/drivers/gpu/drm/bridge/tc358767.c
> +++ b/drivers/gpu/drm/bridge/tc358767.c
> @@ -569,11 +569,10 @@ static int tc_aux_link_setup(struct tc_data *tc)
>  
>  	ret = tc_poll_timeout(tc->regmap, DP_PHY_CTRL, PHY_RDY, PHY_RDY, 1,
>  			      1000);
> -	if (ret == -ETIMEDOUT) {
> +	if (ret) {
>  		dev_err(tc->dev, "Timeout waiting for PHY to become ready");
>  		return ret;
> -	} else if (ret)
> -		goto err;
> +	}
>  
>  	/* Setup AUX link */
>  	tc_write(DP0_AUXCFG1, AUX_RX_FILTER_EN |

-- 
Regards,

Laurent Pinchart