linux-kernel - RE: [RFC - PATCH] base:pm: prepare driver for common clock framework

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Date:	Wed, 19 Sep 2012 14:13:18 +0000
From:	"Karicheri, Muralidharan" <m-karicheri2@...com>
To:	"Karicheri, Muralidharan" <m-karicheri2@...com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <lenb@...nel.org>
CC:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Chemparathy, Cyril" <cyril@...com>,
	"mturquette@...aro.org" <mturquette@...aro.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Linux-sh list <linux-sh@...r.kernel.org>
Subject: RE: [RFC - PATCH] base:pm: prepare driver for common clock framework

+ Len Brown
>> -----Original Message-----
>> From: linux-pm-owner@...r.kernel.org [mailto:linux-pm-owner@...r.kernel.org] On
>> Behalf Of Karicheri, Muralidharan
>> Sent: Wednesday, September 19, 2012 10:09 AM
>> To: Rafael J. Wysocki
>> Cc: linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org; Chemparathy, Cyril;
>> mturquette@...aro.org; Magnus Damm; Linux-sh list
>> Subject: RE: [RFC - PATCH] base:pm: prepare driver for common clock framework
>> 
>> >> -----Original Message-----
>> >> From: Rafael J. Wysocki [mailto:rjw@...k.pl]
>> >> Sent: Tuesday, September 18, 2012 5:34 PM
>> >> To: Karicheri, Muralidharan
>> >> Cc: linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org; Chemparathy, Cyril;
>> >> mturquette@...aro.org; Magnus Damm; Linux-sh list
>> >> Subject: Re: [RFC - PATCH] base:pm: prepare driver for common clock framework
>> >>
>> >> On Saturday, September 15, 2012, Murali Karicheri wrote:
>> >> > As part of my work to migrate davinci SoC code to
>> >> > use common clk framework, I encountered an issue with this driver
>> >> > which is calling clk_enable() and clk_disable() without prepare()/
>> >> > unprepare(). This change is needed to enable common clock migration
>> >> > for davinci SoCs.
>> >> >
>> >> > Signed-off-by: Murali Karicheri <m-karicheri2@...com>
>> >>
>> >> There are other users of this code than davinci.  For example, sh
>> >> and ARM/shmobile both use it.  Have you verified that your changes will
>> >> work for them too?
>> >>
>> Rafael,
>> 
>> Technically do you agree with the changes or do I need to get it reviewed by someone in
>> particular? I have no way of verifying if this works for sh and ARM/shmobile. I have
>> copied this RFC patch to the list showed up by scripts/get_maintainer.pl list. Any idea
>> how I can get this patch reviewed by the sh and ARM/shmobile maintainers and get it
>> tested as well? This is required for DaVinci for sure unless there is an alternate way of
>> doing this. Well, then that is the idea of sending an RFC patch.
>> 
>> -Murali
>> 
>> >> Rafael
>> >>
>> >>
>> >> > diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
>> >> > index eb78e96..9d8fde7 100644
>> >> > --- a/drivers/base/power/clock_ops.c
>> >> > +++ b/drivers/base/power/clock_ops.c
>> >> > @@ -99,7 +99,7 @@ static void __pm_clk_remove(struct pm_clock_entry *ce)
>> >> >
>> >> >  	if (ce->status < PCE_STATUS_ERROR) {
>> >> >  		if (ce->status == PCE_STATUS_ENABLED)
>> >> > -			clk_disable(ce->clk);
>> >> > +			clk_disable_unprepare(ce->clk);
>> >> >
>> >> >  		if (ce->status >= PCE_STATUS_ACQUIRED)
>> >> >  			clk_put(ce->clk);
>> >> > @@ -396,7 +396,7 @@ static void enable_clock(struct device *dev, const char
>> >> *con_id)
>> >> >
>> >> >  	clk = clk_get(dev, con_id);
>> >> >  	if (!IS_ERR(clk)) {
>> >> > -		clk_enable(clk);
>> >> > +		clk_prepare_enable(clk);
>> >> >  		clk_put(clk);
>> >> >  		dev_info(dev, "Runtime PM disabled, clock forced on.\n");
>> >> >  	}
>> >> > @@ -413,7 +413,7 @@ static void disable_clock(struct device *dev, const char
>> >> *con_id)
>> >> >
>> >> >  	clk = clk_get(dev, con_id);
>> >> >  	if (!IS_ERR(clk)) {
>> >> > -		clk_disable(clk);
>> >> > +		clk_disable_unprepare(clk);
>> >> >  		clk_put(clk);
>> >> >  		dev_info(dev, "Runtime PM disabled, clock forced off.\n");
>> >> >  	}
>> >> >
>> 
>> --
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