linux-kernel - Re: [PATCH v1 1/1] i2c: iproc: generate stop event for slave writes

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Date:   Thu, 16 Apr 2020 10:17:11 +0530
From:   Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Lori Hikichi <lori.hikichi@...adcom.com>,
        Shreesha Rajashekar <shreesha.rajashekar@...adcom.com>,
        Nishka Dasgupta <nishkadg.linux@...il.com>,
        linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/1] i2c: iproc: generate stop event for slave writes

On Wed, Apr 15, 2020 at 5:59 PM Wolfram Sang <wsa@...-dreams.de> wrote:
>
> On Sun, Mar 22, 2020 at 11:50:19PM +0530, Rayagonda Kokatanur wrote:
> > When slave status is I2C_SLAVE_RX_END, generate I2C_SLAVE_STOP
> > event to i2c_client.
> >
> > Fixes: c245d94ed106 ("i2c: iproc: Add multi byte read-write support for slave mode")
> > Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>
>
> Just to make sure: That means the HW has already detected a STOP
> condition on the bus?
Yes.
>
> > ---
> >  drivers/i2c/busses/i2c-bcm-iproc.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
> > index 30efb7913b2e..b58224b7ba79 100644
> > --- a/drivers/i2c/busses/i2c-bcm-iproc.c
> > +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
> > @@ -360,6 +360,9 @@ static bool bcm_iproc_i2c_slave_isr(struct bcm_iproc_i2c_dev *iproc_i2c,
> >                       value = (u8)((val >> S_RX_DATA_SHIFT) & S_RX_DATA_MASK);
> >                       i2c_slave_event(iproc_i2c->slave,
> >                                       I2C_SLAVE_WRITE_RECEIVED, &value);
> > +                     if (rx_status == I2C_SLAVE_RX_END)
> > +                             i2c_slave_event(iproc_i2c->slave,
> > +                                             I2C_SLAVE_STOP, &value);
> >               }
> >       } else if (status & BIT(IS_S_TX_UNDERRUN_SHIFT)) {
> >               /* Master read other than start */
> > --
> > 2.17.1
> >