linux-kernel - Re: [PATCH 2/2] ASoC: Intel: Skylake: try to get NHLT blob with PCM params as fallback

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Date:   Wed, 17 Aug 2022 20:48:04 +0800
From:   Icenowy Zheng <uwu@...nowy.me>
To:     Cezary Rojewski <cezary.rojewski@...el.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.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>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Subject: Re: [PATCH 2/2] ASoC: Intel: Skylake: try to get NHLT blob with PCM
 params as fallback

在 2022-08-16星期二的 21:08 +0200，Cezary Rojewski写道：
> On 2022-08-07 7:26 PM, Icenowy Zheng wrote:
> > 在 2022-08-02星期二的 12:30 +0200，Cezary Rojewski写道：
> > > On 2022-07-25 1:10 PM, Icenowy Zheng wrote:
> > > > Switching to use pipeline parameters to get NHLT blob breaks
> > > > audio
> > > > on
> > > > HP Chromebook 13 G1 (at least with MrChromeBox firmware).
> 
> ...
> 
> > > Could you share the NHLT file from your platform plus the format
> > > used
> > > by
> > > the cras/userspace tool? Did you try playing over simple aplay
> > > tool
> > > instead?
> > 
> > I tried 48000Hz 2ch 32bit with speaker-test.
> > 
> > Attached is /sys/firmware/acpi/tables/NHLT.
> 
> 
> Thanks for the NHLT dump. Total of five endpoints are part of the 
> description:
> 
> id 0, DMIC capture, formats:
>         [0] 2/16/16/48000
>         [1] 2/32/32/48000
> id 1, I2S SSP0 playback, formats:
>         [0] 2/24/32/48000
> id 2, I2S SSP0 capture, formats:
>         [0] 4/32/32/48000
> id 3, I2S SSP1 playback, formats:
>         [0] 2/24/32/48000
> id 4, I2S SSP1 capture, formats:
>         [0] 2/24/32/48000
> 
> I know not what "speaker-test" means. Could you specify which
> endpoint 

Well to be honest I know nearly nothing about Intel ASoC. (In fact I
have only a little experience dealing with ASoC on DT-based platforms
with asoc-simple-card)

I assume it uses the first playback stream, because I didn't explicitly
choose any streams; and speaker-test is only a playback test program.

> you are speaking of? Providing either alsa info or at least output of
> 'lsmod | grep snd' would help. I'd like to be aware of which machine 
> board are we talking about.
> 
> What could be guessed with the current info (and some google query),
> is 
> that we are dealing with SKL-Y m5-6Y57, codenamed 'Chell' and the 
> speaker-test is playing through an I2S codec connected to SSP0 port. 
> It's probably max98357a. The skylake-driver version you have gets 
> confused with 24/32 format (userspace is probably attempting 32/32). 
> That or topology file is incorrect..

Yes, it's Chell.

BTW do you need other ACPI tables?

> 
> ..and at this point I probably know more than enough. We have tested 
> basically all of the KBL and AML configurations when fixing
> regressions 
> during recent skylake-driver up-revs. But Chell (and Lars for that 
> matter) families were not among them as these are based on SKL. I'll 
> follow up on this with our partners and come back here. I'm almost 
> certain topology files for the two families mentioned were not
> updated 
> along the way.

Could this be an issue of Coreboot, which generates the NHLT table?

BTW I think Google pinned the official OS of this hardware to a much
lower kernel version (but I don't want to use the official OS because
of limited storage of Chell and lack of VM ability of the OS on Chell).

> 
> 
> Regards,
> Czarek