From: "Péter Ujfalusi" <peter.ujfalusi@ti.com>
To: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: alsa-devel@alsa-project.org, Liam Girdwood <lrg@ti.com>,
Misael Lopez Cruz <misael.lopez@ti.com>
Subject: Re: [PATCH 05/10] ASoC: twl6040: One workqueue should be enough
Date: Tue, 27 Sep 2011 09:33:06 +0300 [thread overview]
Message-ID: <2417914.e6qfaNBTQp@barack> (raw)
In-Reply-To: <20110926212914.GE2872@opensource.wolfsonmicro.com>
On Monday 26 September 2011 22:29:15 Mark Brown wrote:
> On Mon, Sep 26, 2011 at 08:20:11PM +0300, Ujfalusi, Peter wrote:
> > For the ramp code execution we should avoid any delay at all costs,
> > since it can have audible side effects.
>
> If you're that sensitive to latency does a workqueue offer sufficient
> guarantees?
It seams to be pretty good based on my tests.
> > In my past experience the system wq can cause latency, since we usually
> > have slow devices on it (GPS, proximity sensor, magnetometer, etc).
> > Reading from those usually takes considerable amount of time, and
> > we can end up with delayed execution of our ramp code.
>
> How long are these work items taking? I'm wondering if the other work
> items are taking sufficiently long to be actively disruptive if they
> should be isolated from other things rather than the other way around.
> Of course it could also be a large buildup of work...
It could be any random driver (we can have random components on a device).
This is just precaution to protect the audio from nasty things.
--
Péter
next prev parent reply other threads:[~2011-09-27 6:33 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-26 13:26 [PATCH 00/10] ASoC: twl6040: Gain ramp code cleanups Peter Ujfalusi
2011-09-26 13:26 ` [PATCH 01/10] ASoC: twl6040: Rename pga_event to out_drv_event Peter Ujfalusi
2011-09-26 21:19 ` Mark Brown
2011-09-27 6:17 ` Péter Ujfalusi
2011-09-26 13:26 ` [PATCH 02/10] ASoC: twl6040: Combine the custom volsw get, and put functions Peter Ujfalusi
2011-09-26 21:21 ` Mark Brown
2011-09-27 6:16 ` Péter Ujfalusi
2011-09-27 10:56 ` Mark Brown
2011-09-27 11:21 ` Péter Ujfalusi
2011-09-27 11:42 ` Mark Brown
2011-09-27 12:55 ` Péter Ujfalusi
2011-09-26 13:26 ` [PATCH 03/10] ASoC: twl6040: Move delayed_work struct inside twl6040_output for HS/HF Peter Ujfalusi
2011-09-26 21:23 ` Mark Brown
2011-09-26 13:26 ` [PATCH 04/10] ASoC: twl6040: Move the delayed_work for HS detection under twl6040_jack_data Peter Ujfalusi
2011-09-26 21:24 ` Mark Brown
2011-09-26 13:26 ` [PATCH 05/10] ASoC: twl6040: One workqueue should be enough Peter Ujfalusi
2011-09-26 14:41 ` Mark Brown
2011-09-26 17:20 ` Ujfalusi, Peter
2011-09-26 21:29 ` Mark Brown
2011-09-27 6:33 ` Péter Ujfalusi [this message]
2011-09-26 13:26 ` [PATCH 06/10] ASoC: twl6040: correct loop counters for HS/HF ramp code Peter Ujfalusi
2011-09-26 21:33 ` Mark Brown
2011-09-27 6:21 ` Péter Ujfalusi
2011-09-27 11:12 ` Mark Brown
2011-09-26 13:26 ` [PATCH 07/10] ASoC: twl6040: No need to change delay during HS ramp Peter Ujfalusi
2011-09-26 21:33 ` Mark Brown
2011-09-26 13:26 ` [PATCH 08/10] ASoC: twl6040: No need to change delay during HF ramp Peter Ujfalusi
2011-09-26 21:33 ` Mark Brown
2011-09-26 13:26 ` [PATCH 09/10] ASoC: twl6040: Shift 2 identifies the HS output in out_drv_event Peter Ujfalusi
2011-09-26 13:26 ` [PATCH 10/10] ASoC: twl6040: Simplify code in out_drv_event for pending work check Peter Ujfalusi
2011-09-26 14:30 ` Mark Brown
2011-09-26 17:27 ` Ujfalusi, Peter
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