linux-kernel - Re: [PATCH] input: keyboard: imx_sc_key: Only take the valid data from SCU firmware as key state

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Message-ID: <20191213220321.GJ101194@dtor-ws>
Date:   Fri, 13 Dec 2019 14:03:21 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Anson Huang <Anson.Huang@....com>
Cc:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, robh@...nel.org, linux-input@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Linux-imx@....com
Subject: Re: [PATCH] input: keyboard: imx_sc_key: Only take the valid data
 from SCU firmware as key state

On Fri, Dec 13, 2019 at 10:08:29AM +0800, Anson Huang wrote:
> When reading key state from SCU, the response data from SCU firmware
> is 4 bytes due to MU message protocol, but ONLY the first byte is the
> key state, other 3 bytes could be some dirty data, so we should ONLY
> take the first byte as key state to avoid reporting incorrect state.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>

Applied, thank you.

> ---
>  drivers/input/keyboard/imx_sc_key.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/input/keyboard/imx_sc_key.c b/drivers/input/keyboard/imx_sc_key.c
> index 5379952..9f809ae 100644
> --- a/drivers/input/keyboard/imx_sc_key.c
> +++ b/drivers/input/keyboard/imx_sc_key.c
> @@ -78,7 +78,13 @@ static void imx_sc_check_for_events(struct work_struct *work)
>  		return;
>  	}
>  
> -	state = (bool)msg.state;
> +	/*
> +	 * The response data from SCU firmware is 4 bytes,
> +	 * but ONLY the first byte is the key state, other
> +	 * 3 bytes could be some dirty data, so we should
> +	 * ONLY take the first byte as key state.
> +	 */
> +	state = (bool)(msg.state & 0xff);
>  
>  	if (state ^ priv->keystate) {
>  		priv->keystate = state;
> -- 
> 2.7.4
> 

-- 
Dmitry