linux-kernel - Re: [PATCH v3 0/8] platform/x86: introduce p2sb

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Date:   Thu, 23 Dec 2021 18:02:28 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Wolfram Sang <wsa@...nel.org>, Jean Delvare <jdelvare@...e.de>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Tan Jui Nee <jui.nee.tan@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Kate Hsuan <hpa@...hat.com>,
        Jonathan Yong <jonathan.yong@...el.com>,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-gpio@...r.kernel.org,
        platform-driver-x86@...r.kernel.org
Cc:     Jean Delvare <jdelvare@...e.com>, Peter Tyser <ptyser@...-inc.com>,
        Andy Shevchenko <andy@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Gross <markgross@...nel.org>,
        Henning Schild <henning.schild@...mens.com>
Subject: Re: [PATCH v3 0/8] platform/x86: introduce p2sb_bar() helper

Hi,

On 12/23/21 18:00, Hans de Goede wrote:
> Hi,
> 
> On 12/21/21 19:15, Andy Shevchenko wrote:
>> There are a few users and at least one more is coming that would
>> like to utilize P2SB mechanism of hiding and unhiding a device from
>> the PCI configuration space.
>>
>> Here is the series to deduplicate existing users and provide
>> a generic way for new comers.
>>
>> It also includes a patch to enable GPIO controllers on Apollo Lake
>> when it's used with ABL bootloader w/o ACPI support.
>>
>> The patch that bring the helper ("platform/x86/intel: Add Primary
>> to Sideband (P2SB) bridge support") has a commit message that
>> sheds a light on what the P2SB is and why this is needed.
>>
>> Please, comment on the approach and individual patches.
>>
>> The changes made in v2 do not change the main idea and the functionality
>> in a big scale. What we need is probably one more (RE-)test done by Henning.
>> I hope to have it merged to v5.17-rc1 that Siemens can develop their changes
>> based on this series.
>>
>> I have tested this on Apollo Lake platform (I'm able to see SPI NOR and
>> since we have an ACPI device for GPIO I do not see any attempts to recreate
>> one).
>>
>> (Since it's cross subsystem, the PDx86 seems the main one and
>> I think it makes sense to route it throught it with immutable
>> tag or branch provided for the others).
> 
> The series looks good to me:
> 
> Acked-by: Hans de Goede <hdegoede@...hat.com>
> 
> For the series.
> 
> Not sure if this is really 5.17 material this late in the cycle though,
> but lets wait and see what Bjorn and Lee have to say (patch 8/8 still
> needs an ack from Lee).

Correction I just realized that that would be 7/8 that needs an ack from
Lee and that 8/8 needs an ack from Wolfram.

> I'm fine with taking this upstream through the pdx86 tree, please
> prepare a pull-req for everyone involved with an immutable branch
> pushed to pdx86/platform-drivers-x86.git/
> based on 5.16-rc1 (if everyone is happy with merging this for 5.17) or
> based on 5.17-rc1 once that is out.

Regards,

Hans