linux-kernel - Re: [PATCH 3/5] mfd: wm5110: Add delay before releasing reset line on cold boot

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: <20150316171232.GU28806@sirena.org.uk>
Date:	Mon, 16 Mar 2015 17:12:32 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	lee.jones@...aro.org, sameo@...ux.intel.com, lgirdwood@...il.com,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] mfd: wm5110: Add delay before releasing reset line
 on cold boot

On Mon, Mar 16, 2015 at 04:58:42PM +0000, Charles Keepax wrote:

> On the first boot of the wm5110 it is important the reset line is held
> for slightly longer to ensure the device starts up well. This patch adds
> a 5mS delay for this.

How can we tell what first boot is - what happens if the device is fully
powered off during system suspend for example?  I'd expect to see this
done for system resume as well if we don't know power was maintained (or
whatever else the distinction is).

Download attachment "signature.asc" of type "application/pgp-signature" (474 bytes)