linux-kernel - Re: [PATCH] audio: sai: Add Power Management support

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Date:	Thu, 30 Oct 2014 14:56:42 +0000
From:	Huan Wang <alison.wang@...escale.com>
To:	Fabio Estevam <festevam@...il.com>
CC:	"perex@...ex.cz" <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	"Liam Girdwood" <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Nicolin Chen <nicoleotsuka@...il.com>,
	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
Subject: Re: [PATCH] audio: sai: Add Power Management support

Hi, Fabio,

Please always add the driver maintainers (Xiubo Li and Nicolin Chen).
[Alison Wang] ok, thanks for your reminder.

On Wed, Oct 29, 2014 at 1:21 AM, Alison Wang <b18965@...escale.com> wrote:

> +#ifdef CONFIG_PM_SLEEP
> +static int fsl_sai_suspend(struct device *dev)
> +{
> +       struct fsl_sai *sai = dev_get_drvdata(dev);
> +
> +       regcache_cache_only(sai->regmap, true);
> +       regcache_mark_dirty(sai->regmap);
> +
> +       return 0;
> +}
> +
> +static int fsl_sai_resume(struct device *dev)
> +{
> +       struct fsl_sai *sai = dev_get_drvdata(dev);
> +
> +       /* Restore all registers */
> +       regcache_cache_only(sai->regmap, false);
> +       regcache_sync(sai->regmap);
> +
> +       return 0;
> +};
> +#endif /* CONFIG_PM_SLEEP */
> +
> +static const struct dev_pm_ops fsl_sai_pm = {
> +       SET_SYSTEM_SLEEP_PM_OPS(fsl_sai_suspend, fsl_sai_resume)

This could be simplified to:
static SIMPLE_DEV_PM_OPS(fsl_sai_pm, fsl_sai_suspend, fsl_sai_resume);
[Alison Wang] ok.

I am also curious as to how you tested it, as I noticed that
suspend/resume is broken on 3.18-rc for mx6sx.

Are you able to do suspend/resume on 3.18-rc on a mx6sx sdb board?
[Alison Wang] No, I don't have that board. I tested on LS1021A QDS board which supports deep sleep.

Best Regards,
Alison Wang