On Sat, Feb 17, 2018 at 05:09:40PM +0200, Andy Shevchenko wrote:
> On Sat, 2018-02-17 at 17:02 +0200, Andy Shevchenko wrote:
> > On Sat, 2018-02-17 at 14:25 +0100, Dominik Brodowski wrote:
> >
> > > on v4.16-rc1+, sound does not work any more on my Dell XPS 13;
> > > suspend-to-RAM hangs as well. I have bisected this problem down to
> > > commit ca382f5b38f3; reverting this on top of Linus' latest
> > > (1e3510b2b053)
> > > fixes these issues.
> > > And a few snippets from a broken kernel dmesg:
> > >
> > > i2c_designware: probe of INT3432:00 failed with error -38
> > > i2c_designware: probe of INT3433:00 failed with error -38
> >
> > ENOSYS here at probe time, taking into account the commit you think is
> > a
> > culprit, can be passed from gpiod_get() calls only.
> >
> > > Ideas on how to fix this properly?
> >
> > Enable CONFIG_DEBUG_GPIO first and share through some service the
> > dmesg.
> > (it might be good idea to add 'ignore_loglevel initcall_debug' to the
> > kernel command line)
>
> And tell if the following patch helps.
>
> --- a/drivers/i2c/busses/i2c-designware-master.c
> +++ b/drivers/i2c/busses/i2c-designware-master.c
> @@ -644,7 +644,7 @@ static int i2c_dw_init_recovery_info(struct
> dw_i2c_dev *dev)
> gpio = devm_gpiod_get(dev->dev, "scl", GPIOD_OUT_HIGH);
> if (IS_ERR(gpio)) {
> r = PTR_ERR(gpio);
> - if (r == -ENOENT)
> + if (r == -ENOENT || r == -ENOSYS)
> return 0;
> return r;
> }
>
Fixes: ca382f5b38f3 ("i2c: designware: add i2c gpio recovery option")
Tested-and-reported-by: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>
Thanks,
Dominik
