From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:38328 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965954AbeGAQqH (ORCPT ); Sun, 1 Jul 2018 12:46:07 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sergey Larin , Wolfram Sang , Alex Deucher , Wolfram Sang , stable@kernel.org Subject: [PATCH 4.17 206/220] Revert "i2c: algo-bit: init the bus to a known state" Date: Sun, 1 Jul 2018 18:23:50 +0200 Message-Id: <20180701160916.771492910@linuxfoundation.org> In-Reply-To: <20180701160908.272447118@linuxfoundation.org> References: <20180701160908.272447118@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Wolfram Sang commit 2a2c8ee2d72c4f1ba0f7fbb02dc74f971df0f934 upstream. This reverts commit 3e5f06bed72fe72166a6778f630241a893f67799. As per bugzilla #200045, this caused a regression. I don't really see a way to fix it without having the hardware. So, revert the patch and I will fix the issue I was seeing originally in the i2c-gpio driver itself. I couldn't find new users of this algorithm since, so there should be no one depending on the new behaviour. Reported-by: Sergey Larin Fixes: 3e5f06bed72f ("i2c: algo-bit: init the bus to a known state") Signed-off-by: Wolfram Sang Acked-by: Alex Deucher Tested-by: Sergey Larin Signed-off-by: Wolfram Sang Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/i2c/algos/i2c-algo-bit.c | 5 ----- 1 file changed, 5 deletions(-) --- a/drivers/i2c/algos/i2c-algo-bit.c +++ b/drivers/i2c/algos/i2c-algo-bit.c @@ -649,11 +649,6 @@ static int __i2c_bit_add_bus(struct i2c_ if (bit_adap->getscl == NULL) adap->quirks = &i2c_bit_quirk_no_clk_stretch; - /* Bring bus to a known state. Looks like STOP if bus is not free yet */ - setscl(bit_adap, 1); - udelay(bit_adap->udelay); - setsda(bit_adap, 1); - ret = add_adapter(adap); if (ret < 0) return ret;