Hi Daniil,
On Fri, May 01, 2020 at 10:15:18AM +1000, Daniil Lunev wrote:
> On the official revision of coreboot for hatch it doesn't even try to
> load Type C. However it gives some warning messages from
> cros-usbpd-notify-acpi about EC, So I wonder why the check of the same
> type is not appropriate in the typec driver?
I think the difference is that GOOG0003 is already present on shipped /
official versions of coreboot (so not having that check can cause
existing release images/devices to crash), whereas for GOOG0014 that is / isn't
the case.
Is GOOG0014 present on the official release coreboot image for this
device? If so, what's its path (/sys/bus/acpi/devices/<HID>/path) ?
Best regards,
-Prashant
>
> ../chrome/cros_usbpd_notify.c
>
> /* Get the EC device pointer needed to talk to the EC. */
> ec_dev = dev_get_drvdata(dev->parent);
> if (!ec_dev) {
> /*
> * We continue even for older devices which don't have the
> * correct device heirarchy, namely, GOOG0003 is a child
> * of GOOG0004.
> */
> dev_warn(dev, "Couldn't get Chrome EC device pointer.\n");
> }
>
>
> # dmesg
> ...
> [ 8.513351] cros-ec-spi spi-PRP0001:02: EC failed to respond in time
> [ 8.722072] cros-ec-spi spi-PRP0001:02: EC failed to respond in time
> [ 8.729271] cros-ec-spi spi-PRP0001:02: Cannot identify the EC: error -110
> [ 8.736966] cros-ec-spi spi-PRP0001:02: cannot register EC,
> fallback to spidev
> [ 8.767017] cros_ec_lpcs GOOG0004:00: Chrome EC device registered
> [ 8.807537] cros-usbpd-notify-acpi GOOG0003:00: Couldn't get Chrome
> EC device pointer.
> ...
>
> On Fri, May 1, 2020 at 2:17 AM Prashant Malani <pmal...@chromium.org> wrote:
> >
> > Hi Enric,
> >
> > On Thu, Apr 30, 2020 at 8:26 AM Enric Balletbo i Serra
> > <enric.balle...@collabora.com> wrote:
> > >
> > > Hi Prashant,
> > >
> > > On 30/4/20 2:43, Prashant Malani wrote:
> > > > On Wed, Apr 29, 2020 at 5:38 PM Daniil Lunev <dlu...@chromium.org>
> > > > wrote:
> > > >>
> > > >> [to make it appear on the mailing list as I didn't realize I was in
> > > >> hypertext sending mode]
> > > >>
> > > >> On Thu, Apr 30, 2020 at 10:11 AM Daniil Lunev <dlu...@chromium.org>
> > > >> wrote:
> > > >>>
> > > >>> Hi Enric.
> > > >>> I encountered the issue on a Hatch device when trying running 5.4
> > > >>> kernel on that. After talking to Prashant it seems that any device
> > > >>> with coreboot built before a certain point (a particular fix for
> > > >>> device hierarchy in ACPI tables of Chrome devices which happened in
> > > >>> mid-April) will not be able to correctly initialize the driver and
> > > >>> will get a kernel panic trying to do so.
> > > >
> > > > A clarifying detail here: This should not be seen in any current
> > > > *production* device. No prod device firmware will carry the erroneous
> > > > ACPI device entry.
> > > >
> > >
> > > Thanks for the clarification. Then, I don't think we need to upstream
> > > this. This
> > > kind of "defensive-programming" it's not something that should matter to
> > > upstream.
> >
> > Actually, on second thought, I am not 100% sure about this:
> > Daniil, is the erroneous ACPI device on a *production* firmware for
> > this device (I'm not sure about the vintage of that device's BIOS)?
> >
> > My apologies for the confusion, Enric and Daniil; but would be good to
> > get clarification from Daniil.
> >
> > Best regards,
> > >
> > > Thanks,
> > > Enric
> > >
> > >
> > > >>> Thanks,
> > > >>> Daniil
> > > >>>
> > > >>> On Thu, Apr 30, 2020 at 7:58 AM Enric Balletbo i Serra
> > > >>> <enric.balle...@collabora.com> wrote:
> > > >>>>
> > > >>>> Hi Daniil,
> > > >>>>
> > > >>>> Thank you for the patch.
> > > >>>>
> > > >>>> On 28/4/20 3:02, Daniil Lunev wrote:
> > > >>>>> Missing EC in device hierarchy causes NULL pointer to be returned
> > > >>>>> to the
> > > >>>>> probe function which leads to NULL pointer dereference when trying
> > > >>>>> to
> > > >>>>> send a command to the EC. This can be the case if the device is
> > > >>>>> missing
> > > >>>>> or incorrectly configured in the firmware blob. Even if the
> > > >>>>> situation
> > > >>>>
> > > >>>> There is any production device with a buggy firmware outside? Or
> > > >>>> this is just
> > > >>>> for defensive programming while developing the firmware? Which
> > > >>>> device is
> > > >>>> affected for this issue?
> > > >>>>
> > > >>>> Thanks,
> > > >>>> Enric
> > > >>>>
> > > >>>>> occures, the driver shall not cause a kernel panic as the condition
> > > >>>>> is
> > > >>>>> not critical for the system functions.
> > > >>>>>
> > > >>>>> Signed-off-by: Daniil Lunev <dlu...@chromium.org>
> > > >>>>> ---
> > > >>>>>
> > > >>>>> drivers/platform/chrome/cros_ec_typec.c | 5 +++++
> > > >>>>> 1 file changed, 5 insertions(+)
> > > >>>>>
> > > >>>>> diff --git a/drivers/platform/chrome/cros_ec_typec.c
> > > >>>>> b/drivers/platform/chrome/cros_ec_typec.c
> > > >>>>> index 874269c07073..30d99c930445 100644
> > > >>>>> --- a/drivers/platform/chrome/cros_ec_typec.c
> > > >>>>> +++ b/drivers/platform/chrome/cros_ec_typec.c
> > > >>>>> @@ -301,6 +301,11 @@ static int cros_typec_probe(struct
> > > >>>>> platform_device *pdev)
> > > >>>>>
> > > >>>>> typec->dev = dev;
> > > >>>>> typec->ec = dev_get_drvdata(pdev->dev.parent);
> > > >>>>> + if (!typec->ec) {
> > > >>>>> + dev_err(dev, "Failed to get Cros EC data\n");
> > > >>>>> + return -EINVAL;
> > > >>>>> + }
> > > >>>>> +
> > > >>>>> platform_set_drvdata(pdev, typec);
> > > >>>>>
> > > >>>>> ret = cros_typec_get_cmd_version(typec);
> > > >>>>>
