Linux-IIO Archive on lore.kernel.org
 help / color / Atom feed
From: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
To: Couret Charles-Antoine <charles-antoine.couret@essensium.com>
Cc: Andrea Merello <andrea.merello@gmail.com>, <jic23@kernel.org>,
	"Alexandru Ardelean" <alexandru.Ardelean@analog.com>,
	Michael Hennerich <Michael.Hennerich@analog.com>,
	Lars-Peter Clausen <lars@metafoo.de>,
	"Stefan Popa" <stefan.popa@analog.com>,
	Hartmut Knaack <knaack.h@gmx.de>,
	"Peter Meerwald-Stadler" <pmeerw@pmeerw.net>,
	<linux-iio@vger.kernel.org>
Subject: Re: [v2] iio: ad7949: fix channels mixups
Date: Wed, 4 Dec 2019 11:06:59 +0000
Message-ID: <20191204110659.00004987@Huawei.com> (raw)
In-Reply-To: <c3f3367f-cc78-23f3-ec89-439b9bc8f433@essensium.com>

On Mon, 2 Dec 2019 16:36:19 +0100
Couret Charles-Antoine <charles-antoine.couret@essensium.com> wrote:

> Le 02/12/2019 à 15:13, Andrea Merello a écrit :
> >   drivers/iio/adc/ad7949.c | 22 +++++++++++++++++-----
> >   1 file changed, 17 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/iio/adc/ad7949.c b/drivers/iio/adc/ad7949.c
> > index 5c2b3446fa4a..2c6f60edb7ce 100644
> > --- a/drivers/iio/adc/ad7949.c
> > +++ b/drivers/iio/adc/ad7949.c
> > @@ -89,6 +89,7 @@ static int ad7949_spi_read_channel(struct ad7949_adc_chip *ad7949_adc, int *val,
> >   				   unsigned int channel)
> >   {
> >   	int ret;
> > +	int i;
> >   	int bits_per_word = ad7949_adc->resolution;
> >   	int mask = GENMASK(ad7949_adc->resolution, 0);
> >   	struct spi_message msg;
> > @@ -100,12 +101,23 @@ static int ad7949_spi_read_channel(struct ad7949_adc_chip *ad7949_adc, int *val,
> >   		},
> >   	};
> >   
> > -	ret = ad7949_spi_write_cfg(ad7949_adc,
> > -				   channel << AD7949_OFFSET_CHANNEL_SEL,
> > -				   AD7949_MASK_CHANNEL_SEL);
> > -	if (ret)
> > -		return ret;
> > +	/*
> > +	 * 1: write CFG for sample N and read old data (sample N-2)
> > +	 * 2: if CFG was not changed since sample N-1 then we'll get good data
> > +	 *    at the next xfer, so we bail out now, otherwise we write something
> > +	 *    and we read garbage (sample N-1 configuration).
> > +	 */
> > +	for (i = 0; i < 2; i++) {
> > +		ret = ad7949_spi_write_cfg(ad7949_adc,
> > +					   channel << AD7949_OFFSET_CHANNEL_SEL,
> > +					   AD7949_MASK_CHANNEL_SEL);
> > +		if (ret)
> > +			return ret;
> > +		if (channel == ad7949_adc->current_channel)
> > +			break;
> > +	}
> >   
> > +	/* 3: write something and read actual data */
> >   	ad7949_adc->buffer = 0;
> >   	spi_message_init_with_transfers(&msg, tx, 1);
> >   	ret = spi_sync(ad7949_adc->spi, &msg);  
> 
> Signed-off-by: Charles-Antoine Couret <charles-antoine.couret@essensium.com>
Hi Charles-Antoine,

Why a signed-off-by as opposed to a reviewed-by or similar?

signed-off-by brings some very specific legal implications around Developer
Certificate of Origin, so is normally just the author plus people involved in
the path to upstream (maintainers).

> 
> Regards,
> Charles-Antoine Couret



  reply index

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-12 14:43 [PATCH 0/4] Fixes for ad7949 Andrea Merello
2019-09-12 14:43 ` [PATCH 1/4] iio: ad7949: kill pointless "readback"-handling code Andrea Merello
2019-09-13  6:37   ` Ardelean, Alexandru
2019-09-15 10:26     ` Jonathan Cameron
2019-09-12 14:43 ` [PATCH 2/4] iio: ad7949: fix incorrect SPI xfer len Andrea Merello
2019-09-13  6:46   ` Ardelean, Alexandru
2019-09-13  7:56     ` Andrea Merello
2019-09-13  8:28       ` Ardelean, Alexandru
2019-09-15 10:36       ` Jonathan Cameron
2019-09-16  7:51         ` Ardelean, Alexandru
2019-09-21 17:16           ` Jonathan Cameron
2019-09-12 14:43 ` [PATCH 3/4] iio: ad7949: fix SPI xfer delays Andrea Merello
2019-09-13  6:59   ` Ardelean, Alexandru
2019-09-13  8:23     ` Andrea Merello
2019-09-13  8:43       ` Ardelean, Alexandru
2019-09-12 14:43 ` [PATCH 4/4] iio: ad7949: fix channels mixups Andrea Merello
2019-09-13  7:19   ` Ardelean, Alexandru
2019-09-13  8:30     ` Andrea Merello
2019-09-13 11:30       ` Couret Charles-Antoine
2019-09-13 11:40         ` Andrea Merello
2019-09-20  7:45         ` Andrea Merello
2019-09-21 17:12           ` Jonathan Cameron
2019-09-23  8:21             ` Andrea Merello
2019-10-05  9:55               ` Jonathan Cameron
     [not found]                 ` <CAN8YU5PRO5Y5EeEj2SZGm5XfuKSB1rtS7nKdu6wWxXYDOfexqw@mail.gmail.com>
2019-10-22  8:56                   ` Jonathan Cameron
2019-11-04 14:12                     ` Andrea Merello
2019-11-09 11:58                       ` Jonathan Cameron
2019-11-12 15:09                       ` Couret Charles-Antoine
2019-12-02 14:13                         ` [v2] " Andrea Merello
2019-12-02 15:36                           ` Couret Charles-Antoine
2019-12-04 11:06                             ` Jonathan Cameron [this message]
2019-12-04 11:13                               ` Couret Charles-Antoine
2019-12-06 16:45                                 ` Jonathan Cameron
2019-09-13  7:24 ` [PATCH 0/4] Fixes for ad7949 Ardelean, Alexandru
2019-09-13 14:00   ` Couret Charles-Antoine
2019-09-15 10:49     ` Jonathan Cameron
2019-09-16  7:39       ` Andrea Merello
2019-09-16  7:48         ` Ardelean, Alexandru
2019-09-16  7:50           ` Ardelean, Alexandru
2019-09-16  7:34     ` Andrea Merello

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20191204110659.00004987@Huawei.com \
    --to=jonathan.cameron@huawei.com \
    --cc=Michael.Hennerich@analog.com \
    --cc=alexandru.Ardelean@analog.com \
    --cc=andrea.merello@gmail.com \
    --cc=charles-antoine.couret@essensium.com \
    --cc=jic23@kernel.org \
    --cc=knaack.h@gmx.de \
    --cc=lars@metafoo.de \
    --cc=linux-iio@vger.kernel.org \
    --cc=pmeerw@pmeerw.net \
    --cc=stefan.popa@analog.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-IIO Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-iio/0 linux-iio/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-iio linux-iio/ https://lore.kernel.org/linux-iio \
		linux-iio@vger.kernel.org
	public-inbox-index linux-iio

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-iio


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git