linux-kernel - Re: [PATCH v4 2/3] ASoC: cygnus: Add Cygnus audio DAI driver

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Date:	Tue, 1 Dec 2015 18:17:54 -0800
From:	Simran Rai <ssimran@...adcom.com>
To:	Mark Brown <broonie@...nel.org>
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	"Mark Rutland" <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Lori Hikichi <lhikichi@...adcom.com>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<bcm-kernel-feedback-list@...adcom.com>,
	<linux-kernel@...r.kernel.org>,
	Arun Parameswaran <arunp@...adcom.com>,
	<alsa-devel@...a-project.org>
Subject: Re: [PATCH v4 2/3] ASoC: cygnus: Add Cygnus audio DAI driver



On 11/22/2015 5:44 AM, Mark Brown wrote:
> On Mon, Nov 09, 2015 at 04:17:43PM -0800, Simran Rai wrote:
>
>> +#ifdef CONFIG_PM_SLEEP
>> +static int cygnus_ssp_suspend(struct snd_soc_dai *cpu_dai)
>> +{
>> +	struct cygnus_aio_port *aio = cygnus_dai_get_portinfo(cpu_dai);
>> +	struct cygnus_audio *cygaud = snd_soc_dai_get_drvdata(cpu_dai);
>> +
>> +	audio_ssp_out_disable(aio);
>> +	audio_ssp_in_disable(aio);
>> +	if (cygaud->active_ports > 0)
>> +		cygaud->active_ports--;
>> +
>> +	return 0;
>> +}
>> +
>> +static int cygnus_ssp_resume(struct snd_soc_dai *cpu_dai)
>> +{
>> +	return 0;
>> +}
> I'm a bit confused here - why do we need to disable things on suspend
> but not reenable them on resume?  I'd expect that the core would have
> quiesced any streams that need to be suspended before we get as far as
> suspending the drivers.
>
> Please also remove empty functions.
>
> Now I check I see that I'm repeating the questions I had on my previous
> review:
>
> | Blank line between functions and remove empty functions.  Though I'm not
> | clear why the result doesn't undo what the suspend did...
>
> Please don't ignore review comments.

Let me investigate this further and debug why the core did not 
quiescence the streams.

>
>> +	parent = clk_get_parent(cygaud->audio_clk[0]);
>> +	if (IS_ERR(parent)) {
>> +		error = PTR_ERR(parent);
>> +		goto err_get_parent;
>> +	}
>> +
>> +	/* Set PLL VCO Frequency (Hz) to default */
>> +	error = clk_set_rate(parent, DEFAULT_VCO);
>> +	if (error) {
>> +		dev_err(&pdev->dev,
>> +			"%s Set PLL VCO rate failed: %d\n", __func__, error);
>> +		goto err_get_parent;
>> +	}
> I would expect any initialisationn of clocks beyond the ones that the
> device directly interacts with to be handled within the clock API
> configuration rather than in a specific driver, this avoids the driver
> being dependent on a particular system integration.

I will have to figure out a way to propagate the frequency from leaf clocks to the parent
clock. Will send out another patch with the fix.

Thanks,
Simran

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