On Mon, Mar 08, 2021 at 05:35:59PM +0200, Andy Shevchenko wrote:
> On Mon, Mar 08, 2021 at 04:25:05PM +0100, Maximilian Luz wrote:
> > Following commit 036e126c72eb ("pinctrl: intel: Split
> > intel_pinctrl_add_padgroups() for better maintenance"),
> > gpiochip_get_desc() is broken on some Kaby Lake R devices (specifically
> > a Microsoft Surface Book 2), returning -EINVAL for GPIOs that in reality
> > should be there (they are defined in ACPI and have been accessible
> > previously). Due to this, gpiod_get() fails with -ENOENT.
> >
> > Reverting this commit fixes that issue and the GPIOs in question are
> > accessible again.
>
> I would like to have more information.
> Can you enable PINCTRL and GPIO debug options in the kernel, and show dmesg
> output (when kernel command line has 'ignore_loglevel' option) for both
> working
> and non-working cases?
>
> Also if it's possible to have DSDT.dsl of the device in question along with
> output of `grep -H 15 /sys/bus/acpi/devices/*/status`.
>
> > There is probably a better option than straight up reverting this, so
> > consider this more of a bug-report.
>
> Indeed.
Can you test if the below helps (probably you have to apply it by editing
the file manually):
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -1392,6 +1392,7 @@ static int intel_pinctrl_add_padgroups_by_size(struct
intel_pinctrl *pctrl,
gpps[i].size = min(gpp_size, npins);
npins -= gpps[i].size;
+ gpps[i].gpio_base = gpps[i].base;
gpps[i].padown_num = padown_num;
--
With Best Regards,
Andy Shevchenko
