linux-kernel - Re: [PATCH v3 1/4] ASoC: qcom: common: Add qcom_snd_tdm_hw

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Message-ID: <bee0ab28-6bd3-4904-8afc-44fe7ddacb79@sirena.org.uk>
Date:   Thu, 14 Dec 2023 15:56:52 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Jianhua Lu <lujianhua000@...il.com>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Banajit Goswami <bgoswami@...cinc.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/4] ASoC: qcom: common: Add qcom_snd_tdm_hw_params
 function

On Thu, Dec 14, 2023 at 11:51:50PM +0800, Jianhua Lu wrote:
> On Thu, Dec 14, 2023 at 11:11:06AM +0000, Mark Brown wrote:

> > The expectation is that TDM is set up by the machine driver, not from
> > hw_params - if the TDM setup can be changed from within hw_params then
> > it's hard to see how it's going to interact well with other TDM users on
> > the bus.  More usually hw_params() would be influenced by the setup done
> > in set_tdm_slot().

> Currently, qcom TDM setup need to read hw_params, if we want to move it
> to machine driver, we must hardcode some params, but it will reduce reduce
> readability.

What makes you say that TDM setup needs to read hw_params?

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