From mboxrd@z Thu Jan 1 00:00:00 1970 From: Boris Brezillon Subject: Re: [PATCH v2 2/4] spi: spi-fsl-dspi: Fix delete the processing of undefined bitmask for rxdata Date: Sun, 30 Sep 2018 12:06:59 +0200 Message-ID: <20180930120659.71b0e1e5@bbrezillon> References: <20180930092535.24544-1-chuanhua.han@nxp.com> <20180930092535.24544-2-chuanhua.han@nxp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: broonie@kernel.org, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, eha@deif.com To: Chuanhua Han Return-path: In-Reply-To: <20180930092535.24544-2-chuanhua.han@nxp.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-spi.vger.kernel.org On Sun, 30 Sep 2018 17:25:33 +0800 Chuanhua Han wrote: > This patch fixes the problem of rxdata being equal to 0 during the XSPI > mode transfer of the dspi controller. > In XSPI mode, If it is not deleted, the value of rxdata will be equal > to 0, and the data received will not be received correctly, causing the > receiving transfer of the spi to fail. > > Signed-off-by: Chuanhua Han > --- > Changes in v2: > -The original patch is divided into multiple patches(the original > patch theme is "spi: spi-fsl-dspi: Fix support for XSPI transport > mode"),one of which is segmented. > > drivers/spi/spi-fsl-dspi.c | 3 --- > 1 file changed, 3 deletions(-) > > diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c > index 3082e72e4f6c..4dc1064bf408 100644 > --- a/drivers/spi/spi-fsl-dspi.c > +++ b/drivers/spi/spi-fsl-dspi.c > @@ -243,9 +243,6 @@ static void dspi_push_rx(struct fsl_dspi *dspi, u32 rxdata) > if (!dspi->rx) > return; > > - /* Mask of undefined bits */ > - rxdata &= (1 << dspi->bits_per_word) - 1; > - Why not if (dspi->bits_per_word) rxdata &= (1 << dspi->bits_per_word) - 1; > if (dspi->bytes_per_word == 1) > *(u8 *)dspi->rx = rxdata; > else if (dspi->bytes_per_word == 2)