From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:46088 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751722AbcKFL41 (ORCPT ); Sun, 6 Nov 2016 06:56:27 -0500 Subject: Patch "i2c: rk3x: Give the tuning value 0 during rk3x_i2c_v0_calc_timings" has been added to the 4.4-stable tree To: david.wu@rock-chips.com, andy.yan@rock-chips.com, dianders@chromium.org, gregkh@linuxfoundation.org, wsa@the-dreams.de Cc: , From: Date: Sun, 06 Nov 2016 12:56:21 +0100 Message-ID: <1478433381100109@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled i2c: rk3x: Give the tuning value 0 during rk3x_i2c_v0_calc_timings to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: i2c-rk3x-give-the-tuning-value-0-during-rk3x_i2c_v0_calc_timings.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 399c168ab5ab5e12ed55b6c91d61c24eb84c9164 Mon Sep 17 00:00:00 2001 From: David Wu Date: Sat, 22 Oct 2016 16:43:42 +0800 Subject: i2c: rk3x: Give the tuning value 0 during rk3x_i2c_v0_calc_timings From: David Wu commit 399c168ab5ab5e12ed55b6c91d61c24eb84c9164 upstream. We found a bug that i2c transfer sometimes failed on 3066a board with stabel-4.8, the con register would be updated by uninitialized tuning value, it made the i2c transfer failed. So give the tuning value to be zero during rk3x_i2c_v0_calc_timings. Signed-off-by: David Wu Tested-by: Andy Yan Reviewed-by: Douglas Anderson Signed-off-by: Wolfram Sang Signed-off-by: Greg Kroah-Hartman --- drivers/i2c/busses/i2c-rk3x.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/i2c/busses/i2c-rk3x.c +++ b/drivers/i2c/busses/i2c-rk3x.c @@ -600,6 +600,8 @@ static int rk3x_i2c_calc_divs(unsigned l *div_low = *div_low - 1; *div_high = *div_high - 1; + /* Give the tuning value 0, that would not update con register */ + t_calc->tuning = 0; /* Maximum divider supported by hw is 0xffff */ if (*div_low > 0xffff) { *div_low = 0xffff; Patches currently in stable-queue which might be from david.wu@rock-chips.com are queue-4.4/i2c-rk3x-give-the-tuning-value-0-during-rk3x_i2c_v0_calc_timings.patch