linux-kernel - Re: [PATCH v2 4/5] drm/bridge: ps8640: Print an error if VDO control fails

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Date:   Wed, 26 Aug 2020 17:45:40 +0500
From:   Bilal Wasim <bwasim.lkml@...il.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     linux-kernel@...r.kernel.org,
        Collabora Kernel ML <kernel@...labora.com>,
        matthias.bgg@...il.com, drinkcat@...omium.org, hsinyi@...omium.org,
        laurent.pinchart@...asonboard.com, sam@...nborg.org,
        Andrzej Hajda <a.hajda@...sung.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonas Karlman <jonas@...boo.se>,
        Neil Armstrong <narmstrong@...libre.com>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 4/5] drm/bridge: ps8640: Print an error if VDO
 control fails

On Wed, 26 Aug 2020 10:15:25 +0200
Enric Balletbo i Serra <enric.balletbo@...labora.com> 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.
> 
> Reviewed-by: Sam Ravnborg <sam@...nborg.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
> 
> Changes in v2: None
> 
>  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
> ce3e8b2da8c9..9f7b7a9c53c5 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);

Reviewed-by: Bilal Wasim <bwasim.lkml@...il.com>
Tested-by: Bilal Wasim <bwasim.lkml@...il.com>

-Bilal