linux-kernel - Re: [PATCH v4 2/4] SFH: PCI driver to add support of AMD sensor fusion Hub using HID framework

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Date:   Wed, 01 Apr 2020 18:28:51 +0200
From:   Richard Neumann <mail@...hard-neumann.de>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        "Shah, Nehal-bakulchandra" <nehal-bakulchandra.shah@....com>
Cc:     Sandeep Singh <Sandeep.Singh@....com>, Shyam-sundar.S-k@....com,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-input <linux-input@...r.kernel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Jonathan Cameron <jic23@...nel.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH v4 2/4] SFH: PCI driver to add support of AMD sensor
 fusion Hub using HID framework

Am Dienstag, den 31.03.2020, 20:24 +0300 schrieb Andy Shevchenko:
> On Tue, Mar 31, 2020 at 4:26 PM Shah, Nehal-bakulchandra
> <nehal-bakulchandra.shah@....com> wrote:
> > On 3/31/2020 6:01 PM, Richard Neumann wrote:
> > > Not a real review, but your patch series seems to be repeating a
> > > lot
> > > from drivers/i2c/busses/i2c-amd-mp2*.
> > > Is there any chance we could re-use the code?
> > > E.g. the AMD_C2P_* definitions from drivers/i2c/busses/i2c-amd-
> > > mp2.h?
> > 
> > Thanks for the mail. Yes there are some common structures, however
> > as of now we have kept separately considering both
> > 
> > are part of different sub systems. But may be will consider this
> > input for future enhancement.
> 
> It can be done in a form of shared definitions at least in
> include/linux/platform_data/x86/amd-mp2.h or alike ...
> 

I managed to add support for the AMD SFH PCI device to i2c-amd-mp2* and
outsourced the headers to include/linux/i2c-amd-mp2.h. [1]
I also refactored the patch series (excluded the documentation) [2] to
use the PCI device now provided by i2c_amd_mp2_pci and removed some
duplicate and unncessary code.
The driver now consist of just one module (amd_sfhtp_hid).
Unfortunately I was not able to solve the problem, that I get AMD-Vi
IO_PAGE_FAULT errors when not booted with amd_iommu=off.

[1] https://gist.githubusercontent.com/conqp/4d726f86da8a8397d6e70091a124de67/raw/f97e88a0b44d98bfa1258cb73c8afe4dce7afa87/i2c-amd-mp2.patch
[2] https://gist.githubusercontent.com/conqp/67036e690aca89d08b958971edac283d/raw/2a1ef122f9c8c8e07164b6d597962ce7bbad6d45/amd-sfhtp.patch

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