linux-kernel - Re: [PATCH] Input: synaptics - add retry mechanism for reconnect

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] [day] [month] [year] [list]

Date:	Tue, 19 Feb 2013 10:50:26 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Chung-yih Wang <cywang@...omium.org>
Cc:	linux-input@...r.kernel.org, Daniel Kurtz <djkurtz@...omium.org>,
	Henrik Rydberg <rydberg@...omail.se>,
	Seth Forshee <seth.forshee@...onical.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: synaptics - add retry mechanism for reconnect

Hi Chung-yih,

On Mon, Feb 18, 2013 at 04:40:21PM +0800, Chung-yih Wang wrote:
> On the Samsung Series 5 Chromebook, the Synaptics ClickPad will sometimes not
> send an "0xFA" PS/2 ACK in response to a command byte during the reconnect
> sequence following a resume from suspend. From our experiments, the failure can
> happen during any byte of any of the commands in the reconnect batch.
> 
> This failure results in a timeout in the psmouse driver. In addition, the
> ClickPad will often also respond to the next PS/2 command byte with an "0xFE"
> PS/2 RESEND response.

Since you control the firmware of the device can you figure out under
what condition the touchpad does not acknowledge the commands sent to it
and fix it there?

Thanks.

-- 
Dmitry
--
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/