[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <1bb7858d-fab0-f3c2-b786-a93f3789b400@linux.intel.com>
Date: Tue, 25 Jul 2023 12:29:07 +0200
From: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
To: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
alsa-devel@...a-project.org
Cc: sound-open-firmware@...a-project.org, linux-kernel@...r.kernel.org,
Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>,
Cezary Rojewski <cezary.rojewski@...el.com>,
Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
Bard Liao <yung-chuan.liao@...ux.intel.com>,
Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
Mark Brown <broonie@...nel.org>,
Daniel Baluta <daniel.baluta@....com>,
Matthew Auld <matthew.auld@...el.com>
Subject: Re: [PATCH v2 8/9] ASoC: SOF: Intel: Remove deferred probe for SOF
Hey,
On 2023-07-24 13:32, Pierre-Louis Bossart wrote:
>
>
> On 7/19/23 18:41, Maarten Lankhorst wrote:
>> This was only used to allow modprobing i915, by converting to the
>> -EPROBE_DEFER mechanism, it can be completely removed, and is in
>> fact counterproductive since -EPROBE_DEFER otherwise won't be
>> handled correctly.
>
> I personally remember only that the request_module("i915") was the main
> motivation for the use of the workqueue, but when it comes to the
> HDaudio codec management we don't even know what we don't know.
>
> I am a bit worried that the snd-hda-intel driver keeps the workqueue for
> HDaudio codec initialization, and this patch removes the workqueue
> completely for SOF. That doesn't seem right. Either both drivers need a
> workqueue or none need a workqueue.
>
> Maybe what we need is to move the i915/xe initialization out of the
> workqueue, and see in a second pass if that workqueue can be safely
> removed from the SOF driver?
>
As I mentioned in some of the other sound driver conversions. I believe
it's possible to completely kill off most workqueues.
However, I donĀ“t have the hardware or knowledge to test it. I saw that
the SOF had the non-workqueue path already, so it felt less risky to
simply convert it to always use that path.
avs/skylake drivers should be easy to convert too. This is why I left
the comment: "Removing the workqueue would simplify init even further,
but is left as exercise for the reviewer."
HDA-intel has this retry-probe logic used on AMD's,
which makes me more hesitant to convert it.
I wanted to tackle one problem at a time, I believe workqueue removal
can be done by anyone.
Cheers,
~Maarten
Powered by blists - more mailing lists