linux-kernel - Re: [PATCH 2/2] CHROMIUM: tpm: tpm_i2c_infineon: Lock the I2C adapter for a sequence of requests.

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Date:	Wed, 11 Jul 2012 10:19:18 -0500
From:	Kent Yoder <key@...ux.vnet.ibm.com>
To:	Peter Huewe <peter.huewe@...ineon.com>
Cc:	srajiv@...ux.vnet.ibm.com, tpmdd@...horst.net,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Olof Johansson <olof@...om.net>,
	Luigi Semenzato <semenzato@...gle.com>, andi.shyti@...il.com,
	Bryan Freed <bfreed@...omium.org>
Subject: Re: [PATCH 2/2] CHROMIUM: tpm: tpm_i2c_infineon: Lock the I2C
 adapter for a sequence of requests.

Hi Peter / Bryan,

On Tue, Jun 12, 2012 at 02:43:54PM +0200, Peter Huewe wrote:
> From: Bryan Freed <bfreed@...omium.org>
> 
> This is derived from Peter Huewe's recommended fix:
> 
> On some ChromeOS systems, a TPM sharing the I2C bus with another device
> gets confused when it sees I2C requests to that other device.
> This change locks the I2C adapter for the duration of the full sequence
> of I2C requests the TPM needs to complete.
> 
> smbus_xfer is not supported, but SMBUS is not supported by the original
> driver, either.
> 
> Signed-off-by: Bryan Freed <bfreed@...omium.org>
> Signed-off-by: Peter Huewe <peter.huewe@...ineon.com>

  I've applied this patch to my tpmdd staging tree [1].

Thanks,
Kent

[1] git://github.com/shpedoikal/linux.git tpmdd-next

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