From: Takashi Iwai <tiwai@suse.de>
To: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>,
"alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>,
Kai Vehmanen <kai.vehmanen@linux.intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Jie Yang <yang.jie@linux.intel.com>,
"Rojewski, Cezary" <cezary.rojewski@intel.com>,
Takashi Iwai <tiwai@suse.com>,
Liam Girdwood <liam.r.girdwood@linux.intel.com>,
Sam McNally <sammc@chromium.org>, Mark Brown <broonie@kernel.org>,
Ranjani Sridharan <ranjani.sridharan@linux.intel.com>,
Yu-Hsuan Hsu <yuhsuan@chromium.org>,
Daniel Stuart <daniel.stuart14@gmail.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
"Lu, Brent" <brent.lu@intel.com>,
Damian van Soelen <dj.vsoelen@gmail.com>
Subject: Re: [PATCH 2/2] ASoC: Intel: Add period size constraint on strago board
Date: Thu, 30 Jul 2020 18:56:03 +0200 [thread overview]
Message-ID: <s5hy2n1aqn0.wl-tiwai@suse.de> (raw)
In-Reply-To: <f1386a05-8866-9251-c751-21c9109aa35f@linux.intel.com>
On Thu, 30 Jul 2020 17:27:58 +0200,
Pierre-Louis Bossart wrote:
>
>
>
> >> Is this patch required if you've already constrained the period sizes for the
> >> platform driver in patch1?
> >
> > Yes or alsa will select 320 as default period size for it.
>
> ok, then that's a miss in your patch1. 320 samples is a multiple of
> 1ms for 48kHz rates. I think it was valid only for the 16kHz VoIP
> paths used in some versions of Android, but that we don't support in
> the upstream code.
>
> To build on Takashi's answer, the real ask here is to require that the
> period be a multiple of 1ms, because that's the fundamental
> design/limitation of firmware. It doesn't matter if it's 48, 96, 192,
> 240, 480, 960 samples.
If the 1ms alignment is the condition, it can be better with a
different hw_params constraint. We can use
snd_pcm_hw_constraint_step() for such a purpose.
thanks,
Takashi
next prev parent reply other threads:[~2020-07-30 16:57 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-29 11:03 [PATCH 0/2] Add period size constraint for Atom Chromebook Brent Lu
2020-07-29 11:03 ` [PATCH 1/2] ASoC: intel: atom: Add period size constraint Brent Lu
2020-07-29 11:19 ` Andy Shevchenko
2020-07-29 11:03 ` [PATCH 2/2] ASoC: Intel: Add period size constraint on strago board Brent Lu
2020-07-29 14:08 ` Pierre-Louis Bossart
2020-07-30 8:02 ` Lu, Brent
2020-07-30 15:27 ` Pierre-Louis Bossart
2020-07-30 15:44 ` Pierre-Louis Bossart
2020-07-30 16:17 ` Lu, Brent
2020-07-30 16:56 ` Takashi Iwai [this message]
2020-07-31 12:28 ` Lu, Brent
2020-07-29 11:20 ` [PATCH 0/2] Add period size constraint for Atom Chromebook Andy Shevchenko
2020-07-31 12:26 ` [PATCH v3 " Brent Lu
2020-07-31 12:26 ` [PATCH v3 1/2] ASoC: intel: atom: Add period size constraint Brent Lu
2020-07-31 12:26 ` [PATCH v3 2/2] ASoC: Intel: Add period size constraint on strago board Brent Lu
2020-07-31 13:34 ` Takashi Iwai
2020-08-01 8:58 ` Lu, Brent
2020-08-01 9:26 ` Takashi Iwai
2020-08-03 13:00 ` Lu, Brent
2020-08-03 15:13 ` Pierre-Louis Bossart
2020-08-03 16:45 ` Lu, Brent
2020-08-03 16:56 ` Takashi Iwai
2020-08-04 4:33 ` Lu, Brent
2020-08-04 14:24 ` Pierre-Louis Bossart
2020-08-06 16:41 ` Lu, Brent
2020-08-10 15:03 ` Pierre-Louis Bossart
2020-08-10 17:38 ` Yu-Hsuan Hsu
2020-08-11 2:16 ` Lu, Brent
2020-08-11 2:29 ` Yu-Hsuan Hsu
2020-08-11 7:43 ` Takashi Iwai
2020-08-11 8:25 ` Yu-Hsuan Hsu
2020-08-11 8:39 ` Takashi Iwai
2020-08-11 9:35 ` Yu-Hsuan Hsu
2020-08-11 14:53 ` Mark Brown
2020-08-11 16:54 ` Pierre-Louis Bossart
2020-08-11 17:22 ` Mark Brown
2020-08-12 3:09 ` Yu-Hsuan Hsu
2020-08-12 6:13 ` Takashi Iwai
2020-08-12 6:53 ` Yu-Hsuan Hsu
2020-08-12 6:58 ` Takashi Iwai
2020-08-12 7:43 ` Yu-Hsuan Hsu
2020-08-12 7:47 ` Takashi Iwai
2020-08-12 14:46 ` Pierre-Louis Bossart
2020-08-12 14:55 ` Takashi Iwai
2020-08-12 15:54 ` Pierre-Louis Bossart
2020-08-12 16:08 ` Lu, Brent
2020-08-12 16:38 ` Pierre-Louis Bossart
2020-08-13 6:24 ` Yu-Hsuan Hsu
2020-08-13 7:55 ` Lu, Brent
2020-08-13 8:36 ` Yu-Hsuan Hsu
2020-08-13 8:45 ` Takashi Iwai
2020-08-13 12:57 ` Pierre-Louis Bossart
2020-08-13 17:15 ` Yu-Hsuan Hsu
2020-08-21 16:40 ` [PATCH v3 0/2] Add period size constraint for Atom Chromebook Mark Brown
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