linux-kernel - Re: [PATCH v12 4/5] Input: goodix

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Message-ID: <1477575876.2458.23.camel@hadess.net>
Date:   Thu, 27 Oct 2016 15:44:36 +0200
From:   Bastien Nocera <hadess@...ess.net>
To:     Irina Tirdea <irina.tirdea@...el.com>, linux-input@...r.kernel.org
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Aleksei Mamlin <mamlinav@...il.com>,
        Karsten Merker <merker@...ian.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Octavian Purdila <octavian.purdila@...el.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v12 4/5] Input: goodix - fix reset sequence

On Sat, 2016-09-10 at 20:57 +0300, Irina Tirdea wrote:
> According to the Goodix datasheet, the reset sequence will leave
> the reset line set to output high. To end the selection of the I2C
> address, we just need to set the input line to low for at least
> 50 ms and then set it to input floating (already implemented by
> goodix_int_sync).
> 
> Remove setting the reset line to input from the reset sequence,
> since that is not reflected in the datasheet.
> 
> This is based on Goodix datasheets for GT911 and GT9271 and on Goodix
> driver gt9xx.c for Android (publicly available in Android kernel
> trees for various devices).
> 
> Suggested-by: Troy Kisky <troy.kisky@...ndarydevices.com>
> Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>

Code looks fine. Again, would be nice to know on which devices this was
tested.

> ---
>  drivers/input/touchscreen/goodix.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/goodix.c
> b/drivers/input/touchscreen/goodix.c
> index 182ff9c..6fba804 100644
> --- a/drivers/input/touchscreen/goodix.c
> +++ b/drivers/input/touchscreen/goodix.c
> @@ -454,10 +454,6 @@ static int goodix_reset(struct goodix_ts_data
> *ts)
>  	usleep_range(6000, 10000);		/* T4: > 5ms */
>  
>  	/* end select I2C slave addr */
> -	error = gpiod_direction_input(ts->gpiod_rst);
> -	if (error)
> -		return error;
> -
>  	error = goodix_int_sync(ts);
>  	if (error)
>  		return error;