From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <55272CC7.4070105@huawei.com> Date: Fri, 10 Apr 2015 09:52:07 +0800 From: Zefan Li MIME-Version: 1.0 To: Axel Lin CC: , "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Mark Brown Subject: Re: [PATCH 3.4 115/176] spi: dw: Fix detecting FIFO depth References: <1428569028-23762-1-git-send-email-lizf@kernel.org> <1428569224-23820-115-git-send-email-lizf@kernel.org> In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: On 2015/4/9 17:37, Axel Lin wrote: > 2015-04-09 16:46 GMT+08:00 : >> From: Axel Lin >> >> 3.4.107-rc1 review patch. If anyone has any objections, please let me know. >> >> ------------------ >> >> >> commit d297933cc7fcfbaaf2d37570baac73287bf0357d upstream. >> >> Current code tries to find the highest valid fifo depth by checking the value >> it wrote to DW_SPI_TXFLTR. There are a few problems in current code: >> 1) There is an off-by-one in dws->fifo_len setting because it assumes the latest >> register write fails so the latest valid value should be fifo - 1. >> 2) We know the depth could be from 2 to 256 from HW spec, so it is not necessary >> to test fifo == 257. In the case fifo is 257, it means the latest valid >> setting is fifo = 256. So after the for loop iteration, we should check >> fifo == 2 case instead of fifo == 257 if detecting the FIFO depth fails. >> This patch fixes above issues. >> >> Signed-off-by: Axel Lin >> Reviewed-and-tested-by: Andy Shevchenko >> Signed-off-by: Mark Brown >> [lizf: Backported to 3.4: adjust context] >> Signed-off-by: Zefan Li > > Hi, > This patch needs below fix: > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/spi/spi-dw.c?id=9d239d353c319f9ff884c287ce47feb7cdf60ddc > Already queued. :) See "[PATCH 3.4 173/176] spi: dw: revisit FIFO size detection again" Thanks for your review!