linux-kernel - Re: [PATCH v1 3/3] drm/panel: ili9341: Use predefined error codes

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Message-ID: <d435b6f6-2c67-4ec3-b346-08c6dd02ee38@linaro.org>
Date: Thu, 25 Apr 2024 18:00:55 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Randy Dunlap <rdunlap@...radead.org>, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org
Cc: Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg
 <sam@...nborg.org>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v1 3/3] drm/panel: ili9341: Use predefined error codes

On 25/04/2024 16:26, Andy Shevchenko wrote:
> In one case the -1 is returned which is quite confusing code for
> the wrong device ID, in another the ret is returning instead of
> plain 0 that also confusing as readed may ask the possible meaning
> of positive codes, which are never the case there. Convert both
> to use explicit predefined error codes to make it clear what's going
> on there.
> 
> Fixes: 5a04227326b0 ("drm/panel: Add ilitek ili9341 panel driver")
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>   drivers/gpu/drm/panel/panel-ilitek-ili9341.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9341.c b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
> index 24c74c56e564..b933380b7eb7 100644
> --- a/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
> +++ b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
> @@ -422,7 +422,7 @@ static int ili9341_dpi_prepare(struct drm_panel *panel)
>   
>   	ili9341_dpi_init(ili);
>   
> -	return ret;
> +	return 0;
>   }
>   
>   static int ili9341_dpi_enable(struct drm_panel *panel)
> @@ -726,7 +726,7 @@ static int ili9341_probe(struct spi_device *spi)
>   	else if (!strcmp(id->name, "yx240qv29"))
>   		return ili9341_dbi_probe(spi, dc, reset);
>   
> -	return -1;
> +	return -ENODEV;
>   }
>   
>   static void ili9341_remove(struct spi_device *spi)

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>