linux-kernel - Re: Fwd: [PATCH] [MMC] fix clock problem in PXA255/270

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Date:	Tue, 29 Apr 2008 11:39:46 +0200
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	Tadeusz Gozdek <linux_fan@...pl>
Cc:	linux-kernel@...r.kernel.org, marcel@...tmann.org
Subject: Re: Fwd: [PATCH] [MMC] fix clock problem in PXA255/270

On Tue, 29 Apr 2008 08:49:17 +0200
Tadeusz Gozdek <linux_fan@...pl> wrote:

> Hi
> As you can check, after finishing all operations clock is leaved as switched on (its switched off and on again during sending next command e.g. GO_INACTIVE_STATE). The same is after wake-up the system, even if the clock was switched off. 
> Switched on clock has sometimes an influence on the rest of the hardware e.g. the GPS modules and on battery life in a battery powered systems.
> 

That is a policy with possible side-effects (i.e. needs to be
configurable), and host independent so it should be in the core. So I'm
afraid I have to NAK your patch.

As a side-note, the PXA driver shouldn't be fiddling with the clock the
way it does right now in the first place, but I have no maintainer to
yell at. Patches removing that behaviour are very welcome.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org
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