From: "Alexander Shiyan" <shc_work@mail.ru>
To: "Mark Brown" <broonie@kernel.org>
Cc: alsa-devel@alsa-project.org, "Arnd Bergmann" <arnd@arndb.de>,
"Takashi Iwai" <tiwai@suse.de>,
"Liam Girdwood" <lgirdwood@gmail.com>,
"Olof Johansson" <olof@lixom.net>
Subject: Re: [PATCH 1/2] ASoC: Add driver for CLPS711X DAI interface
Date: Thu, 27 Feb 2014 11:17:27 +0400 [thread overview]
Message-ID: <1393485447.431844445@f286.i.mail.ru> (raw)
In-Reply-To: <20140227034430.GB9383@sirena.org.uk>
Четверг, 27 февраля 2014, 12:44 +09:00 от Mark Brown <broonie@kernel.org>:
> On Wed, Feb 26, 2014 at 08:05:41PM +0400, Alexander Shiyan wrote:
>
> > +static int clps711x_dai_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div)
> > +{
> > + struct clps711x_dai *s = dev_get_drvdata(dai->dev);
> > +
> > + s->div2 = div;
> > +
> > + return 0;
> > +}
>
> What is this divider and why does the machine driver need to manually
> configure it?
I'll think about it ...
> > +static int clps711x_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
> > +{
> > + struct snd_soc_pcm_runtime *rtd = substream->private_data;
> > + struct clps711x_dai *dai = snd_soc_platform_get_drvdata(rtd->platform);
> > +
> > + switch (cmd) {
> > + case SNDRV_PCM_TRIGGER_START:
> > + atomic_set(&dai->running, 1);
> > + hrtimer_start(&dai->hrt, ns_to_ktime(dai->reload),
> > + HRTIMER_MODE_REL);
> > + break;
>
> I'm wondering if the FIQ code can be shared with the i.MX FIQ code? Not
> something that should block merging but it seems like it might be
> helpful for other platforms that need to use FIQ support.
This FIQ implementation and i.MX FIQ is totally different.
I am fully confident that we can not use any common features/calls.
> > +static int clps711x_pcm_silence(struct snd_pcm_substream *substream,
> > + int channel, snd_pcm_uframes_t pos,
> > + snd_pcm_uframes_t count)
> > +{
> > + return 0;
> > +}
>
> Omit empty functions.
So designed. I'll add a comment in the next version.
> > +#if defined(CONFIG_SND_CLPS711X_SOC_MODULE)
> > +irqreturn_t no_action(int irq, void *dev_id)
> > +{
> > + return IRQ_NONE;
> > +}
> > +#endif
>
> Eh? Waht's this about?
In case using this driver as non-module, "no_action" handler is used
from kernel/irq/handle.c, but since it is not exported it cannot be used
in module case.
I'll remade this to use own empty handler always.
---
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next prev parent reply other threads:[~2014-02-27 7:17 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-26 16:05 [PATCH 0/2] ASoC: ARM Cirrus Logic CLPS711X DAI driver Alexander Shiyan
2014-02-26 16:05 ` [PATCH 1/2] ASoC: Add driver for CLPS711X DAI interface Alexander Shiyan
2014-02-27 3:44 ` Mark Brown
2014-02-27 7:17 ` Alexander Shiyan [this message]
2014-02-28 3:57 ` Mark Brown
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