linux-kernel - Re: [PATCH V2] ASoC: fsl_ssi: refine ipg clock usage in this module

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Date:	Fri, 12 Sep 2014 15:14:28 +0800
From:	Shengjiu Wang <shengjiu.wang@...escale.com>
To:	Markus Pargmann <mpa@...gutronix.de>
CC:	Nicolin Chen <nicoleotsuka@...il.com>, <timur@...i.org>,
	<Li.Xiubo@...escale.com>, <lgirdwood@...il.com>,
	<broonie@...nel.org>, <perex@...ex.cz>, <tiwai@...e.de>,
	<alsa-devel@...a-project.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] ASoC: fsl_ssi: refine ipg clock usage in this module

On Fri, Sep 12, 2014 at 08:17:06AM +0200, Markus Pargmann wrote:
> Hi,
> 
> On Fri, Sep 12, 2014 at 10:01:12AM +0800, Shengjiu Wang wrote:
> > On Thu, Sep 11, 2014 at 03:57:37PM -0700, Nicolin Chen wrote:
> > > On Thu, Sep 11, 2014 at 01:38:29PM +0800, Shengjiu Wang wrote:
> > > > Move the ipg clock enable and disable operation to startup and shutdown,
> > > > that is only enable ipg clock when ssi is working. Keep clock is disabled
> > > > when ssi is in idle.
> > > > otherwise, _fsl_ssi_set_dai_fmt function need to be called in probe,
> > > > so add ipg clock control for it.
> > > 
> > > It seems to be no objection so far against my last suggestion to
> > > use regmap's mmio_clk() for named ipg clk only. So you may still
> > > consider about that.
> > >
> > I think mmio_clk() can be put to another patch. and this patch only for clk_enable()
> > and clk_disable() operation.
> 
> I would also prefer Nicolin's suggestion using regmap's mmio clk. I
> think it may be better to not add this particular patch at all and just
> go with the mmio_clk patch. It should be easy enough to just add the
> clock names to the devicetrees. That way we can avoid all those clock
> enable/disable function calls.
>
I considered if use Nicolin's suggestion, I still need ot add those
enable/disable function calls, because I want to remove the enable/disable
function call in fsl_ssi_imx_probe, then I need to add enable/disable 
function call in _fsl_ssi_set_dai_fmt(), which is called in fsl_ssi_probe().
_fsl_ssi_set_dai_fmt() need to access the registers.

> >  
> > > Anyway, I'd like to do thing in parallel. So I just simply tested
> > > it on my side and its works fine, it may still need to be tested
> > > by others though.
> > > 
> > > Nicolina
> > 
> > Hi Markus
> > 
> > could you please review it, and share your comments?
> 
> I think the clock enabling for AC97 is missing in your patch.
> 
I add clock enable in fsl_ssi_startup(), I think it is enough for AC97, does it?

wang shengjiu

> Best regards,
> 
> Markus
> 
> -- 
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