Re: [PATCH 2/3] drm/bridge: ps8640: Print an error if VDO control fails

From: Sam Ravnborg <sam@ravnborg.org>
To: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Cc: linux-kernel@vger.kernel.org,
	Jernej Skrabec <jernej.skrabec@siol.net>,
	drinkcat@chromium.org, Jonas Karlman <jonas@kwiboo.se>,
	David Airlie <airlied@linux.ie>,
	Neil Armstrong <narmstrong@baylibre.com>,
	dri-devel@lists.freedesktop.org,
	Andrzej Hajda <a.hajda@samsung.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	hsinyi@chromium.org, matthias.bgg@gmail.com,
	Collabora Kernel ML <kernel@collabora.com>
Subject: Re: [PATCH 2/3] drm/bridge: ps8640: Print an error if VDO control fails
Date: Sat, 22 Aug 2020 11:23:06 +0200	[thread overview]
Message-ID: <20200822092306.GB430436@ravnborg.org> (raw)
In-Reply-To: <20200615205320.790334-3-enric.balletbo@collabora.com>

On Mon, Jun 15, 2020 at 10:53:19PM +0200, Enric Balletbo i Serra wrote:
> Print an error message inside ps8640_bridge_vdo_control() function when
> it fails so we can simplify a bit the callers, they will only need to
> check the error code.
> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>

> ---
> 
>  drivers/gpu/drm/bridge/parade-ps8640.c | 13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
> index ce3e8b2da8c9b..9f7b7a9c53c52 100644
> --- a/drivers/gpu/drm/bridge/parade-ps8640.c
> +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
> @@ -82,8 +82,11 @@ static int ps8640_bridge_vdo_control(struct ps8640 *ps_bridge,
>  	ret = i2c_smbus_write_i2c_block_data(client, PAGE3_SET_ADD,
>  					     sizeof(vdo_ctrl_buf),
>  					     vdo_ctrl_buf);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		DRM_ERROR("failed to %sable VDO: %d\n",
> +			  ctrl == ENABLE ? "en" : "dis", ret);
>  		return ret;
> +	}
>  
>  	return 0;
>  }
> @@ -150,10 +153,8 @@ static void ps8640_pre_enable(struct drm_bridge *bridge)
>  	}
>  
>  	ret = ps8640_bridge_vdo_control(ps_bridge, ENABLE);
> -	if (ret) {
> -		DRM_ERROR("failed to enable VDO: %d\n", ret);
> +	if (ret)
>  		goto err_regulators_disable;
> -	}
>  
>  	/* Switch access edp panel's edid through i2c */
>  	ret = i2c_smbus_write_byte_data(client, PAGE2_I2C_BYPASS,
> @@ -175,9 +176,7 @@ static void ps8640_post_disable(struct drm_bridge *bridge)
>  	struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
>  	int ret;
>  
> -	ret = ps8640_bridge_vdo_control(ps_bridge, DISABLE);
> -	if (ret < 0)
> -		DRM_ERROR("failed to disable VDO: %d\n", ret);
> +	ps8640_bridge_vdo_control(ps_bridge, DISABLE);
>  
>  	gpiod_set_value(ps_bridge->gpio_reset, 1);
>  	gpiod_set_value(ps_bridge->gpio_powerdown, 1);
> -- 
> 2.27.0
> 
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