linux-kernel - Re: [RFC PATCH] Soundwire: Initialize multi

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Date:   Mon, 15 Aug 2022 10:16:39 +0200
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Khalid Masum <khalid.masum.92@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     ALSA Development Mailing List <alsa-devel@...a-project.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>
Subject: Re: [RFC PATCH] Soundwire: Initialize multi_link with fwnode props



On 8/15/22 06:28, Khalid Masum wrote:
> On 8/15/22 00:46, Andy Shevchenko wrote:
>> On Sun, Aug 14, 2022 at 11:31 AM Khalid Masum
>> <khalid.masum.92@...il.com> wrote:
>>>
>>> According to the TODO, In sw_bus_master_add, bus->multi_link is to be
>>> populated with properties from FW node props. Make this happen by
>>> creating a new fwnode_handle flag FWNODE_FLAG_MULTI_LINKED and use
>>> the flag to store the multi_link value from intel_link_startup. Use
>>> this flag to initialize bus->multi_link.
>>
>> ...
>>
>>>          /*
>>>           * Initialize multi_link flag
>>> -        * TODO: populate this flag by reading property from FW node
>>>           */
>>> -       bus->multi_link = false;
>>> +       bus->multi_link = (fwnode->flags & FWNODE_FLAG_MULTI_LINKED)
>>> +               == FWNODE_FLAG_MULTI_LINKED;
>>
>> NAK (as far as I understood the context of the comment and the change
>> itself).
>>
>> These flags are for devlink, we do not mix FW properties with those
>> internal flags anyhow. The comment suggests that this should be az
>> property. Also commit message doesn't explain the relation to devlink.
>>
> That is a good information to know. Thanks.
> 
> I shall try to find out if I can somehow get multi_link's value from
> fwnode in any other way and look into devlink in the process.
> 
> If you have any suggestions regarding this TODO, please let me know.

The suggestion is to remove the TODO and leave the code as is: the
capabilities enabled for multi-link are required as part of the
programming sequences, even when a stream uses a single link we still
use the syncArm/syncGo sequences.

Please don't change this.