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

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Date:   Fri, 15 Dec 2023 00:55:08 +0800
From:   Jianhua Lu <lujianhua000@...il.com>
To:     Mark Brown <broonie@...nel.org>
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 03:56:52PM +0000, Mark Brown wrote:
> 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?

qcom_snd_tdm_hw_params function read PCM_FORMAT to set slot_width value, read
channels to set rx_mask value.