linux-kernel - Re: Nokia N900 retention mode in v4.6, camera buttons fun

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]

Date:	Fri, 29 Apr 2016 22:06:00 +0200
From:	Sebastian Reichel <sre@...nel.org>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Pavel Machek <pavel@....cz>, Tony Lindgren <tony@...mide.com>,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-omap@...r.kernel.org, khilman@...nel.org,
	aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
	patrikbachan@...il.com, serge@...lyn.com,
	Tomi Valkeinen <tomi.valkeinen@...com>
Subject: Re: Nokia N900 retention mode in v4.6, camera buttons fun

Hi,

On Thu, Apr 21, 2016 at 03:04:50PM +0200, Pali Rohár wrote:
> > CONFIG_HSI breaks power management completely, so power management
> > with modem will be another topic.  
> 
> Sebastian, any idea why power management does not work for HSI?

I wasn't aware, that pm_runtime_irq_safe() basically breaks runtime
PM until Tony's fix for musb (even though it's logical when thinking
about it). Currently omap-ssi and omap-ssi-port make use of
pm_runtime_irq_safe().

Since pm_runtime_get_sync/pm_runtime_put_sync is called from
tasklets in omap-ssi (and omap-ssi-port) it cannot be simply
removed. So fixing PM for the ssi controller requires reworking
the driver in a non trivial way.

-- Sebastian

Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)