linux-kernel - Re: [linux-pm] [RFC,PATCHv3 0/3] sdhci runtime

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Date:	Tue, 1 Mar 2011 14:33:07 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Pierre Tardy <tardyp@...il.com>
cc:	linux-kernel@...r.kernel.org,
	<linux-pm@...ts.linux-foundation.org>, <linux-mmc@...r.kernel.org>
Subject: Re: [linux-pm] [RFC,PATCHv3 0/3] sdhci runtime_pm implementation

On Tue, 1 Mar 2011, Pierre Tardy wrote:

> Please find sdhci runtime_pm implementation.
> 
> It uses clock gating fw as a tip to know when our chip is idle.
> It implements wake up from card insertion/removal.
> 
> This is RFC, please dont merge yet. I really would like to have deep review
> from PCI linux-pm guys.
> 
> Opens are: 
> 
> 1/ Not sure if the pci configs in the driver in rpm_suspend/resume flow
>  are not duplicate from what the core is doing.

There may be one or two small errors.

> 2/ Wakeup from D3hot: I cannot find any driver that is implementing it in current upstream,

Other drivers do it, but they use PCI PME# instead of interrupts.

> I'm not sure if I'm doing it the good way. 
> We have the exact same issue for our not yet upstreamable usb-otg driver.
> Not sure if this cannot be implemented generically in core.

Alan Stern

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