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From: Tony Lindgren <tony@atomide.com>
To: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: Mark Brown <broonie@kernel.org>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
	alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org,
	linux-omap@vger.kernel.org, "Arthur D ." <spinal.by@gmail.com>,
	Merlijn Wajer <merlijn@wizzup.org>, Pavel Machek <pavel@ucw.cz>,
	Sebastian Reichel <sre@kernel.org>,
	Jarkko Nikula <jarkko.nikula@bitmer.com>
Subject: Re: [PATCH] ASoC: cpcap: Implement set_tdm_slot for voice call support
Date: Tue, 18 Feb 2020 07:32:11 -0800	[thread overview]
Message-ID: <20200218153211.GI35972@atomide.com> (raw)
In-Reply-To: <8fc1dded-6d28-f5cd-f2f9-3a6810571119@ti.com>

* Peter Ujfalusi <peter.ujfalusi@ti.com> [200218 15:16]:
> On 18/02/2020 1.23, Tony Lindgren wrote:
> > * Peter Ujfalusi <peter.ujfalusi@ti.com> [200214 13:30]:
> >> Hi Tony,
> >>
> >> On 12/02/2020 16.46, Tony Lindgren wrote:
> >>> * Peter Ujfalusi <peter.ujfalusi@ti.com> [200212 09:18]:
> >>>> On 11/02/2020 20.10, Tony Lindgren wrote:
> >>>>> +static int cpcap_voice_set_tdm_slot(struct snd_soc_dai *dai,
> >>>>> +				    unsigned int tx_mask, unsigned int rx_mask,
> >>>>> +				    int slots, int slot_width)
> >>>>> +{
> >>>>> +	struct snd_soc_component *component = dai->component;
> >>>>> +	struct cpcap_audio *cpcap = snd_soc_component_get_drvdata(component);
> >>>>> +	int err, ts_mask, mask;
> >>>>> +	bool voice_call;
> >>>>> +
> >>>>> +	/*
> >>>>> +	 * Primitive test for voice call, probably needs more checks
> >>>>> +	 * later on for 16-bit calls detected, Bluetooth headset etc.
> >>>>> +	 */
> >>>>> +	if (tx_mask == 0 && rx_mask == 1 && slot_width == 8)
> >>>>> +		voice_call = true;
> >>>>> +	else
> >>>>> +		voice_call = false;
> >>>>
> >>>> You only have voice call if only rx slot0 is in use?
> >>>
> >>> Yeah so it seems. Then there's the modem to wlcore bluetooth path that
> >>> I have not looked at. But presumably that's again just configuring some
> >>> tdm slot on the PMIC.
> >>>
> >>>> If you record mono on the voice DAI, then rx_mask is also 1, no?
> >>>
> >>> It is above :) But maybe I don't follow what you're asking here
> >>
> >> If you arecrod -Dvoice_pcm -c1 -fS8 > /dev/null
> >> then it is reasonable that the machine driver will set rx_mask = 1
> >>
> >>> and maybe you have some better check in mind.
> >>
> >> Not sure, but relying on set_tdm_slots to decide if we are in a call
> >> case does not sound right.
> > 
> > OK yeah seems at least bluetooth would need to be also handled
> > in the set_tdm_slots.
> 
> set_tdm_slots() is for setting how the TDM slots supposed to be used by
> the component and not really for things to configure different operating
> modes.
> 
> If you hardwire things in set_tdm_slots() for the droid4 then how the
> codec driver can be reused in other setups?

Right, I'm all go for better solutions :)

> >>>> You will also set the sampling rate for voice in
> >>>> cpcap_voice_hw_params(), but that is for normal playback/capture, right?
> >>>
> >>> Yeah so normal playback/capture is already working with cpcap codec driver
> >>> with mainline Linux. The voice call needs to set rate to 8000.
> >>
> >> But if you have a voice call initiated should not the rate be set by the
> >> set_sysclk()?
> > 
> > Hmm does set_sysclk called from modem codec know that cpcap codec
> > is the clock master based on bitclock-master and set the rate
> > for cpcap codec?
> 
> Neither component should call set_sysclk, set_tdm_slots. The machine
> driver should as it is the only one who know how things are wired...

OK, but so what's the machine driver part in this case?

Regards,

Tony


  reply	other threads:[~2020-02-18 15:32 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-11 18:10 Tony Lindgren
2020-02-12  9:17 ` Peter Ujfalusi
2020-02-12 14:46   ` Tony Lindgren
2020-02-14 13:29     ` Peter Ujfalusi
2020-02-17 23:23       ` Tony Lindgren
2020-02-18 15:15         ` Peter Ujfalusi
2020-02-18 15:32           ` Tony Lindgren [this message]
2020-02-18 16:44             ` Mark Brown
2020-02-18 17:06             ` Sebastian Reichel
2020-02-18 17:42               ` Mark Brown
2020-02-19 17:39                 ` Tony Lindgren
2020-02-19 17:46                   ` Mark Brown
2020-02-19 18:49                     ` Tony Lindgren
2020-02-19 18:53               ` Tony Lindgren

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