Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754482Ab0DTKxi (ORCPT ); Tue, 20 Apr 2010 06:53:38 -0400 Received: from fg-out-1718.google.com ([72.14.220.159]:43026 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754225Ab0DTKxf (ORCPT ); Tue, 20 Apr 2010 06:53:35 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:from:to:cc:subject:date:message-id:x-mailer; b=b0bmSzPtM/VmY1N1SUdXapXG4JTtyBveJv/+mOnQI55/ranYXCH0064dZX33NEaWXA 6Af3y5ZwgIAm9Osxi5TUHRfujzV11LzIlBUZMnUG3YT2+VkpMBqY/3XGGcxNMQ6bjL/b K3y/s3u+3PyyhEQh0FQwHq8kpbaZrdFbm16+k= From: Yauhen Kharuzhy To: Ben Dooks Cc: Jean Delvare , linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, Yauhen Kharuzhy Subject: [PATCH] i2c-s3c2410: Decrease delay after end of transaction Date: Tue, 20 Apr 2010 13:53:19 +0300 Message-Id: <1271760799-30913-1-git-send-email-yauhen.kharuzhy@promwad.com> X-Mailer: git-send-email 1.6.6.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1066 Lines: 33 msleep(1) which has been used for delay after issuing a STOP condition to bus cause very big delay (min 1/HZ s). This is makes bulk register update in I2C devices (for instance video camera) very slowly. Seems that this delay can be safely decreased to few tens of microseconds. Signed-off-by: Yauhen Kharuzhy --- drivers/i2c/busses/i2c-s3c2410.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c index d27072b..de20a4e 100644 --- a/drivers/i2c/busses/i2c-s3c2410.c +++ b/drivers/i2c/busses/i2c-s3c2410.c @@ -521,7 +521,7 @@ static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, /* ensure the stop has been through the bus */ - msleep(1); + udelay(50); out: return ret; -- 1.6.6.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/