linux-kernel - Re: [PATCH v5 2/3] drm/msm/dp: replace variable err with len at dp_aux_link_power

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Date:   Mon, 12 Sep 2022 21:34:00 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>,
        dri-devel@...ts.freedesktop.org, robdclark@...il.com,
        sean@...rly.run, swboyd@...omium.org, dianders@...omium.org,
        vkoul@...nel.org, daniel@...ll.ch, airlied@...ux.ie,
        agross@...nel.org, bjorn.andersson@...aro.org
Cc:     quic_abhinavk@...cinc.com, quic_sbillaka@...cinc.com,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/3] drm/msm/dp: replace variable err with len at
 dp_aux_link_power_up()

On 12/09/2022 19:23, Kuogee Hsieh wrote:
> drm_dp_dpcd_readb() will return 1 to indicate one byte had been read
> successfully. This patch replace variable "err" with "len" have more
> correct meaning.
> 
> changes in v5:
> -- split into 3 patches
> 
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> ---
>   drivers/gpu/drm/msm/dp/dp_link.c | 14 +++++++-------
>   1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c
> index 36f0af0..9d5381d 100644
> --- a/drivers/gpu/drm/msm/dp/dp_link.c
> +++ b/drivers/gpu/drm/msm/dp/dp_link.c
> @@ -49,21 +49,21 @@ static int dp_aux_link_power_up(struct drm_dp_aux *aux,
>   					struct dp_link_info *link)
>   {
>   	u8 value;
> -	int err;
> +	ssize_t len;
>   
>   	if (link->revision < 0x11)
>   		return 0;
>   
> -	err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
> -	if (err < 0)
> -		return err;
> +	len = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
> +	if (len < 0)
> +		return len;
>   
>   	value &= ~DP_SET_POWER_MASK;
>   	value |= DP_SET_POWER_D0;
>   
> -	err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
> -	if (err < 0)
> -		return err;
> +	len = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
> +	if (len < 0)
> +		return len;
>   
>   	usleep_range(1000, 2000);
>   

-- 
With best wishes
Dmitry