linux-kernel - Re: [PATCH v2] i2c-eg20t: Rework pch_i2c_wait_for_bus

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Message-ID: <20120224121753.GE2479@pengutronix.de>
Date:	Fri, 24 Feb 2012 13:17:53 +0100
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Alexander Stein <alexander.stein@...tec-electronic.com>
Cc:	Jean Delvare <khali@...ux-fr.org>, Ben Dooks <ben-linux@...ff.org>,
	Feng Tang <feng.tang@...el.com>, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] i2c-eg20t: Rework pch_i2c_wait_for_bus_idle to
 reduce wait time

On Mon, Feb 20, 2012 at 09:14:16AM +0100, Alexander Stein wrote:
> If you insert several i2c transfers, the driver might start the next one
> while the STOP bit of the previous transfer is still on the bus, marking
> the bus as busy.
> pch_i2c_wait_for_bus_idle does an msleep(20) delaying the next transfer
> by >=20ms. Reduce wait time by actively waiting 5 us once, then using
> usleep_range.
> 
> Signed-off-by: Alexander Stein <alexander.stein@...tec-electronic.com>

Tomoya, are you happy with it? (I hope he reads the list, since his
companies mailserver doesn't seem to accept my mails).

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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