linux-kernel - RE: [PATCH v1 1/3]mmc: implemented runtime pm for mmc host

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Date:	Mon, 17 Jan 2011 10:59:25 +0000
From:	"Tardy, Pierre" <pierre.tardy@...el.com>
To:	"Dong, Chuanxiao" <chuanxiao.dong@...el.com>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"cjb@...top.org" <cjb@...top.org>,
	"ohad@...ery.com" <ohad@...ery.com>
Subject: RE: [PATCH v1 1/3]mmc: implemented runtime pm for mmc host


> MMC host has a sysfs interface to let user specify the auto suspended delay.
> Each slot of the host controller can have a different delay for runtime
> suspended.


>   out:
> +	/* power off host controller */
> +	pm_runtime_put(&host->class_dev);
If you want to use autosuspend feature, then you need to use the function pm_runtime_put_autosuspend().


I'm also worried about this patch not taking in account the 8 clock cycles before shutting down the clock, contrary to the clock gating fw.
If you power down hc, you will also gate the clock. So the sdio protocol might not be strictly followed.


Regards,
Pierre
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