linux-kernel - Re: [PATCH v5 0/4] SFH: Add Support for AMD Sensor Fusion Hub

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Message-ID: <c8046227481b367a3a1bbd123234279fcde76f87.camel@richard-neumann.de>
Date:   Tue, 28 Jul 2020 17:05:20 +0200
From:   Richard Neumann <mail@...hard-neumann.de>
To:     Marco Felsch <m.felsch@...gutronix.de>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Sandeep Singh <Sandeep.Singh@....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>,
        "Shah, Nehal-bakulchandra" <Nehal-bakulchandra.Shah@....com>,
        Shyam-sundar.S-k@....com
Subject: Re: [PATCH v5 0/4] SFH: Add Support for AMD Sensor Fusion Hub

Hi,

Am Dienstag, den 28.07.2020, 16:58 +0200 schrieb Marco Felsch:
> Hi,
> 
> On 20-05-29 17:21, Andy Shevchenko wrote:
> > On Fri, May 29, 2020 at 4:42 PM Sandeep Singh <
> > Sandeep.Singh@....com> wrote:
> > > From: Sandeep Singh <sandeep.singh@....com>
> > > 
> > > AMD SFH(Sensor Fusion Hub) is HID based driver.SFH FW
> > > is part of MP2 processor (MP2 which is an ARM® Cortex-M4
> > > core based co-processor to x86) and it runs on MP2 where
> > > in driver resides on X86.The driver functionalities are
> > > divided  into three parts:-
> > > 
> > > 1: amd-mp2-pcie:-       This module will communicate with MP2 FW
> > > and
> > >                         provide that data into DRAM.
> > > 2: Client driver :-     This part for driver will use dram data
> > > and
> > >                         convert that data into HID format based
> > > on
> > >                         HID reports.
> > > 3: Transport driver :-  This part of driver will communicate with
> > >                         HID core. Communication between devices
> > > and
> > >                         HID core is mostly done via HID reports
> > > 
> > > In terms of architecture it is much more reassembles like
> > > ISH(Intel Integrated Sensor Hub). However the major difference
> > > is all the hid reports are generated as part of kernel driver.
> > > AMD SFH driver taken reference from ISH in terms of
> > > design and functionalities at fewer location.
> > > 
> > > AMD sensor fusion Hub is part of a SOC 17h family based
> > > platforms.
> > > The solution is working well on several OEM products.
> > > AMD SFH uses HID over PCIe bus.
> > > 
> > 
> > I can't believe this is fifth version.
> > Guys, you have to do much more work on these drivers.
> 
> Is there any active development addressing Andy's comments? Else can
> we
> support you to bring these patches mainline?
> 
> Regards,
>   Marco

I did some major refactoring¹ on the v4 patch series and am currently
providing it for Arch Linux as a DKMS package in the AUR².
A teensy bit of my changes seems to have influenced the v5 version but
I actually did some major changes, like strictly separating the HID,
platform and PCI driver parts.
I did not submit my changes for upstream so far, since I do not want to
undermine AMD's work on this nor cause competing driver
implementations.

Sincerely,

Richard

[1] https://github.com/conqp/linux/tree/amd-sfh-hid/drivers/hid/amd-sfh-hid
[2] https://aur.archlinux.org/packages/amd-sfh-hid-dkms/