Messages in this thread | | | Date | Wed, 20 Apr 2016 23:31:21 +0200 | From | Wolfram Sang <> | Subject | Re: [PATCH v6 07/19] i2c: octeon: Use i2c recovery framework |
| |
On Mon, Apr 11, 2016 at 05:28:38PM +0200, Jan Glauber wrote: > Switch to the i2c bus recovery framework using generic SCL recovery. > If this fails try to reset the hardware. The recovery is triggered > during START on timeout of the interrupt or failure to reach > the START / repeated-START condition. > > The START function is moved to xfer and while at it: > - removed xfer debug message (i2c core already provides debugging) > - removed length is zero check > > Signed-off-by: Jan Glauber <jglauber@cavium.com> > --- > drivers/i2c/busses/i2c-octeon.c | 178 +++++++++++++++++++++++++--------------- > 1 file changed, 111 insertions(+), 67 deletions(-)
Interesting, it got larger...
> > +/** > + * octeon_i2c_write_int - read the TWSI_INT register
read_int
> + int ret, retries = 2;
I don't think 'retries' makes sense here. On failure, you return -EAGAIN, so the core will retry 'adapter->retries' times anyhow.
> - if (length < 1) > - return -EINVAL;
So, the adapter support 0-length messages now? Or why was it there? I have the feeling this is a seperate patch.
> +static void octeon_i2c_prepare_recovery(struct i2c_adapter *adap) > +{ > + struct octeon_i2c *i2c = i2c_get_adapdata(adap); > + > + /* > + * The stop resets the state machine, does not _transmit_ STOP unless > + * engine was active. > + */ > + octeon_i2c_stop(i2c); > + > + octeon_i2c_write_int(i2c, 0);
Maybe a comment why the delay?
> + udelay(5); > +} [unhandled content-type:application/pgp-signature] | |