linux-kernel - Re: [PATCH 1/2] mmc: add functions to enable/disable aggressive clock gating

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Date:	Thu, 18 Aug 2011 13:34:41 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	cjb@...top.org
Subject: Re: [PATCH 1/2] mmc: add functions to enable/disable aggressive
 clock gating

On Wed, Aug 17, 2011 at 03:19:14PM +0300, Mika Westerberg wrote:
> On Wed, Aug 17, 2011 at 09:51:31AM +0200, Linus Walleij wrote:
> > 
> > I would suggest that in all patches using these functions, try
> > to replace:
> > 
> > mmc_host_clk_disable() -> mmc_host_clk_ungate()
> > mmc_host_clk_enable() -> mmc_host_clk_gate()
> > 
> 
> Wow, that is indeed *much* cleaner way of doing this!
> 
> One thing is that if I call these from those ios functions,
> mmc_host_clk_ungate() will always try to restore the clock
> even if there is really no need. Do you see this as a problem?
> 
> > Please tell us if this works!
> 
> Certainly. I'll try this overnight and see whether it works.

The device survived overnight reboot loop test, so this scheme seems to
work.

I'll prepare a new series which uses mmc_host_clk_{ungate|gate}().
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