linux-kernel - Re: [alsa-devel] [PATCH] ASoC: core: add support to card re-bind/unbind using component framework

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Message-ID: <20180712161728.GH10369@sirena.org.uk>
Date:   Thu, 12 Jul 2018 17:17:28 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Takashi Iwai <tiwai@...e.de>, alsa-devel@...a-project.org,
        lgirdwood@...il.com,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        bgoswami@...eaurora.org, rohitkr@...eaurora.org, vkoul@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [alsa-devel] [PATCH] ASoC: core: add support to card
 re-bind/unbind using component framework

On Thu, Jul 12, 2018 at 10:54:05AM -0500, Pierre-Louis Bossart wrote:
> On 7/12/18 10:42 AM, Takashi Iwai wrote:

> > It's basically similar as the hotplug like USB, so I thought it would
> > work as is.

> Such transitions would probably not break userspace but they result from an
> explicit user action. The DSP going off and back is less clear, you might
> want the system to wait before triggering re-routing to different outputs,
> etc.

> Again I wasn't trying to push back but rather ask what the side effects of
> this patch might be for userspace.

For userspace it's just another reason why a card might hotplug, it
doesn't make much difference - this doesn't add hotplugging of the DSP,
it just supports components getting removed like we used to.  If someone
decides to start randomly rebooting their DSP that's probably going to
be disruptive no matter what.

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