linux-kernel - Re: [PATCH v2 1/1] platform/x86/intel_cht_int33fe: Split code to USB TypeB and TypeC variants

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Date:   Thu, 19 Sep 2019 01:11:42 +0300
From:   Yauhen Kharuzhy <jekhor@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Shevchenko <andy@...radead.org>
Subject: Re: [PATCH v2 1/1] platform/x86/intel_cht_int33fe: Split code to USB
 TypeB and TypeC variants

On Wed, Sep 18, 2019 at 11:33:32PM +0300, Yauhen Kharuzhy wrote:
> On Wed, Sep 18, 2019 at 10:12:43PM +0200, Hans de Goede wrote:
> > Hi,
> > 
> > On 18-09-2019 13:42, Yauhen Kharuzhy wrote:
> > > On Wed, Sep 18, 2019 at 11:20:21AM +0200, Hans de Goede wrote:
> > > > Hi,
> > > > 
> > > > On 17-09-2019 21:45, Yauhen Kharuzhy wrote:
> > > > > Existing intel_cht_int33fe ACPI pseudo-device driver assumes that
> > > > > hardware has TypeC connector and register related devices described as
> > > > > I2C connections in the _CRS resource.
> > > > > 
> > > > > There is at least one hardware (Lenovo Yoga Book YB1-91L/F) with micro
> > > > > USB B connector exists. It has INT33FE device in the DSDT table but
> > > > > there are only two I2C connection described: PMIC and BQ27452 battery
> > > > > fuel gauge.
> > > > > 
> > > > > Splitting existing INT33FE driver allow to maintain code for USB type B
> > > > > (AB) connector variant separately and make it simpler.
> > > > > 
> > > > > Split driver to intel_cht_int33fe_common.c and
> > > > > intel_cht_int33fe_{typeb,typec}.c. Compile all this source to one .ko
> > > > > module to make user experience easier.
> > > > > 
> > > > > Signed-off-by: Yauhen Kharuzhy <jekhor@...il.com>
> > > > 
> > > > Thank you for doing this, this version looks much better IMHO.
> > > > 
> > > > Note that this does not apply to Linus' current master, please
> > > > rebase. Specifically this conflicts with this patch:
> > > > 
> > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=78cd4bf53635d3aeb73435bc89eb6eb39450f315
> > > > 
> > > > Which just got merged. Instead of rebasing on Linus' master
> > > > (which is always a bit adventurous to use during the merge window)
> > > > you can also cherry-pick that single commit on top of v5.3
> > > > and use that as a base.
> > > > 
> > > > Note that that patch makes changes to struct cht_int33fe_data
> > > > specifically it drops the:
> > > > 
> > > > 	struct fwnode_handle *mux;
> > > > 
> > > > Member, so when rebasing you should drop that in the new
> > > > version of the struct on common.h .
> > > > 
> > > > Besides that this need a rebase, overall this looks good, I have some
> > > > small remarks inline:
> > > 
> > > Arghh.. OK, I have rebased the patch but at current torvalds kernel
> > > i2c_acpi_new_device() fails with -EPROBE_DEFER at my hw, so I cannot check if it
> > > is fully working. But I will resend patch anyway soon, this error should
> > > not be related to the patch content.
> > 
> > Are you sure it is not working? -EPROBE_DEFER is normal(ish) it just means
> > that the i2c-controller driver for the bus has not initialized yet.
> > 
> > If you are building the i2c_designware or acpi_lpss drivers as module, or if
> > you are building the intel_cht_int33fe code into the kernel, then this
> > is more or less expected to happen.
> 
> I would agree but i2cdetect/i2cget works for this bus as expected. I
> remember that I met this bug at one of previous iterations, hm... As I remember
> it was caused by this commit:
> 00500147cbd3fc51353d0d003eaa9d31c72c0d50 drivers: Introduce device lookup variants by ACPI_COMPANION device.
> 
> This needs to be investigated.

It was reverted by commit merged today, so it is not an issue anymore:

commit 644bf60088955421051e716ab9c8fe7fb7997fd7
Author: Suzuki K Poulose <suzuki.poulose@....com>
Date:   Thu Aug 1 11:20:24 2019 +0100

    i2c: Revert incorrect conversion to use generic helper



> > You can do "ls /sys/bus/i2c/devices" to check if it did succeed on
> > later re-probe attempts (the fuel-gauge device should be there if
> > things succeeded).
> > 
> > And you should probably do one more version, suppressing the dev_err
> > on -EPROBE_DEFER like e.g. this snippet from the typec code:
> 
> OK, -EPROBE_DEFER was unexpected here for me...
> 
>  
> 
> -- 
> Yauhen Kharuzhy

-- 
Yauhen Kharuzhy