linux-kernel - Re: [RFC PATCH 0/3] Separate BE DAI HW constraints from FE ones

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Message-ID: <a0c862ec-44ba-52e0-551c-0347166ac4e9@perex.cz>
Date:   Tue, 23 Mar 2021 13:15:42 +0100
From:   Jaroslav Kysela <perex@...ex.cz>
To:     Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Cc:     tiwai@...e.com, lgirdwood@...il.com, broonie@...nel.org,
        mirq-linux@...e.qmqm.pl, gustavoars@...nel.org
Subject: Re: [RFC PATCH 0/3] Separate BE DAI HW constraints from FE ones

Dne 23. 03. 21 v 12:43 Codrin Ciubotariu napsal(a):

> To achieve this, the first thing needed is to detect whether a HW
> constraint rule is enforced by a FE or a BE DAI. This means that
> snd_pcm_hw_rule_add() needs to be able to differentiate between the two
> type of DAIs. For this, the runtime pointer to struct snd_pcm_runtime is
> replaced with a pointer to struct snd_pcm_substream, to be able to reach
> substream->pcm->internal to differentiate between FE and BE DAIs.

Think about other not-so-invasive solution. What about to use
'runtime->private_data' (struct snd_soc_pcm_runtime *) to determine FE / BE?

					Jaroslav
-- 
Jaroslav Kysela <perex@...ex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.