linux-kernel - Re: [PATCH v2] platform/chrome: wilco_ec: Provide correct output format to 'h1

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Date:   Tue, 14 Apr 2020 15:14:37 +0200
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Bernardo Perez Priego <bernardo.perez.priego@...el.com>,
        Benson Leung <bleung@...omium.org>,
        Nick Crews <ncrews@...omium.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Daniel Campello <campello@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] platform/chrome: wilco_ec: Provide correct output
 format to 'h1_gpio' file

Hi Bernardo,

Thank you for your patch.

On 3/4/20 0:33, Bernardo Perez Priego wrote:
> Function 'h1_gpio_get' is receiving 'val' parameter of type u64,
> this is being passed to 'send_ec_cmd' as type u8, thus, result
> is stored in least significant byte. Due to output format,
> the whole 'val' value was being displayed when any of the most
> significant bytes are different than zero.
> 
> This fix will make sure only least significant byte is displayed
> regardless of remaining bytes value.
> 
> Signed-off-by: Bernardo Perez Priego <bernardo.perez.priego@...el.com>
> ---

Applied for 5.8

> Changes in v2:
> - Keep original format and apply mask instead to resolve warning
> 
>  drivers/platform/chrome/wilco_ec/debugfs.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/chrome/wilco_ec/debugfs.c b/drivers/platform/chrome/wilco_ec/debugfs.c
> index df5a5f6c3ec6..a812788a0bdc 100644
> --- a/drivers/platform/chrome/wilco_ec/debugfs.c
> +++ b/drivers/platform/chrome/wilco_ec/debugfs.c
> @@ -208,7 +208,12 @@ static int send_ec_cmd(struct wilco_ec_device *ec, u8 sub_cmd, u8 *out_val)
>   */
>  static int h1_gpio_get(void *arg, u64 *val)
>  {
> -	return send_ec_cmd(arg, SUB_CMD_H1_GPIO, (u8 *)val);
> +	int ret;
> +
> +	ret = send_ec_cmd(arg, SUB_CMD_H1_GPIO, (u8 *)val);
> +	if (ret == 0)
> +		*val &= 0xFF;
> +	return ret;
>  }
>  
>  DEFINE_DEBUGFS_ATTRIBUTE(fops_h1_gpio, h1_gpio_get, NULL, "0x%02llx\n");
>