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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <8250E4885F9967469CAC3FB5CBA2CE69934E7AA2FE@irsmsx501.ger.corp.intel.com>
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
---------------------------------------------------------------------
Intel Corporation SAS (French simplified joint stock company)
Registered headquarters: "Les Montalets"- 2, rue de Paris, 
92196 Meudon Cedex, France
Registration Number:  302 456 199 R.C.S. NANTERRE
Capital: 4,572,000 Euros

This e-mail and any attachments may contain confidential material for
the sole use of the intended recipient(s). Any review or distribution
by others is strictly prohibited. If you are not the intended
recipient, please contact the sender and delete all copies.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/