linux-kernel - mfd regmap irq to handle some cases

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-next>] [day] [month] [year] [list]

Date:	Mon, 23 Jan 2012 14:17:03 +0530
From:	Ashish Jangam <ashish.jangam@...tcummins.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	<linux-kernel@...r.kernel.org>
Subject: mfd regmap irq to handle some cases

Hi Mark,

DA9052-53 PMIC supports Tick & Periodic Alarm. On expiry of Alarm an event gets generate
and data ( about the alram type - Tick or Periodic) also gets lock in a register. This
data needs to be read from the register before event is cleared . But since in regmap irq
events are cleared first and then left for processing (which is the obvious way to do) but
in this approach data gets loss from the DA9052-53 register and alarm type cannot be
determined.

For a quick fix in regmap irq we may tempt to defer event clarification after processing of
event but there is a problem in this approach for some variants of DA9052 and DA9053 when
event is cleared a spurious interrupt gets generated therefore in earlier release of DA9052/53
MFD module a delay was added. Therefore we need to think on how to handle such cases in regmap irq.

Regards,
Ashish

--
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/