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From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Marco Felsch <m.felsch@pengutronix.de>
Cc: robh+dt@kernel.org, andriy.shevchenko@linux.intel.com,
	bparrot@ti.com, andy.shevchenko@gmail.com,
	simon.budig@kernelconcepts.de, hdegoede@redhat.com,
	fcooper@ti.com, mripard@kernel.org,
	alexandre.belloni@bootlin.com, shawnguo@kernel.org,
	devicetree@vger.kernel.org, kernel@pengutronix.de,
	linux-input@vger.kernel.org,
	Philipp Zabel <p.zabel@pengutronix.de>
Subject: Re: [PATCH v2 1/5] Input: edt-ft5x06: work around first register access error
Date: Mon, 2 Dec 2019 09:58:51 -0800
Message-ID: <20191202175851.GB50317@dtor-ws> (raw)
In-Reply-To: <20191127120948.22251-2-m.felsch@pengutronix.de>

On Wed, Nov 27, 2019 at 01:09:44PM +0100, Marco Felsch wrote:
> From: Philipp Zabel <p.zabel@pengutronix.de>
> 
> The EP0700MLP1 returns bogus data on the first register read access
> (reading the threshold parameter from register 0x00):
> 
>     edt_ft5x06 2-0038: crc error: 0xfc expected, got 0x40
> 
> It ignores writes until then. This patch adds a dummy read after which
> the number of sensors and parameter read/writes work correctly.
> 
> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

Need your signed-off-by as well.

> ---
>  drivers/input/touchscreen/edt-ft5x06.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
> index d61731c0037d..b87b1e074f62 100644
> --- a/drivers/input/touchscreen/edt-ft5x06.c
> +++ b/drivers/input/touchscreen/edt-ft5x06.c
> @@ -1050,6 +1050,7 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
>  {
>  	const struct edt_i2c_chip_data *chip_data;
>  	struct edt_ft5x06_ts_data *tsdata;
> +	u8 buf[2] = { 0xfc, 0x00 };
>  	struct input_dev *input;
>  	unsigned long irq_flags;
>  	int error;
> @@ -1140,6 +1141,12 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,
>  		return error;
>  	}
>  
> +	/*
> +	 * Dummy read access. EP0700MLP1 returns bogus data on the first
> +	 * register read access and ignores writes.
> +	 */
> +	edt_ft5x06_ts_readwrite(tsdata->client, 2, buf, 2, buf);
> +
>  	edt_ft5x06_ts_set_regs(tsdata);
>  	edt_ft5x06_ts_get_defaults(&client->dev, tsdata);
>  	edt_ft5x06_ts_get_parameters(tsdata);
> -- 
> 2.20.1
> 

-- 
Dmitry

  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-27 12:09 [PATCH v2 0/5] EDT-FT5x06 improvements Marco Felsch
2019-11-27 12:09 ` [PATCH v2 1/5] Input: edt-ft5x06: work around first register access error Marco Felsch
2019-12-02 17:58   ` Dmitry Torokhov [this message]
2019-12-03  8:15     ` Marco Felsch
2019-11-27 12:09 ` [PATCH v2 2/5] Input: edt-ft5x06 - alphabetical include reorder Marco Felsch
2019-11-27 12:09 ` [PATCH v2 3/5] dt-bindings: Input: edt-ft5x06 - document wakeup-source capability Marco Felsch
2019-12-05 21:15   ` Rob Herring
2019-11-27 12:09 ` [PATCH v2 4/5] Input: edt-ft5x06 - make wakeup-source switchable Marco Felsch
2019-12-02 18:00   ` Dmitry Torokhov
2019-12-10  8:36     ` Marco Felsch
2019-11-27 12:09 ` [PATCH v2 5/5] Input: edt-ft5x06 - improve power management operations Marco Felsch
2019-11-27 12:59   ` Andy Shevchenko
2019-11-27 13:06     ` Marco Felsch
2019-11-27 14:32       ` Andy Shevchenko
2019-11-27 17:25         ` Marco Felsch
2019-11-27 18:06           ` Andy Shevchenko
2019-12-02 18:04   ` Dmitry Torokhov
2019-12-10  8:43     ` Marco Felsch
2019-11-27 17:10 ` [PATCH v2 0/5] EDT-FT5x06 improvements Andy Shevchenko
2019-11-27 17:14 ` Andy Shevchenko
2019-11-27 17:25   ` Marco Felsch

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