Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753305AbcKUGDT (ORCPT ); Mon, 21 Nov 2016 01:03:19 -0500 Received: from mail-pf0-f196.google.com ([209.85.192.196]:34957 "EHLO mail-pf0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751214AbcKUGDP (ORCPT ); Mon, 21 Nov 2016 01:03:15 -0500 From: Sanchayan Maity To: broonie@kernel.org Cc: stefan@agner.ch, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, Sanchayan Maity Subject: [PATCH v2 2/4] spi: spi-fsl-dspi: Fix continuous selection format Date: Mon, 21 Nov 2016 11:24:02 +0530 Message-Id: <1317eff8a40789c47311c219d9cfb4105863bd9f.1479706671.git.maitysanchayan@gmail.com> X-Mailer: git-send-email 2.10.2 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 991 Lines: 26 Current DMA implementation was not handling the continuous selection format viz. SPI chip select would be deasserted even between sequential serial transfers. Use the cs_change variable and correctly set or reset the CONT bit accordingly for case where peripherals require the chip select to be asserted between sequential transfers. Signed-off-by: Sanchayan Maity --- drivers/spi/spi-fsl-dspi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c index b1ee1f5..41422cd 100644 --- a/drivers/spi/spi-fsl-dspi.c +++ b/drivers/spi/spi-fsl-dspi.c @@ -261,6 +261,8 @@ static int dspi_next_xfer_dma_submit(struct fsl_dspi *dspi) dspi->dma->tx_dma_buf[i] = SPI_PUSHR_TXDATA(val) | SPI_PUSHR_PCS(dspi->cs) | SPI_PUSHR_CTAS(0); + if (!dspi->cs_change) + dspi->dma->tx_dma_buf[i] |= SPI_PUSHR_CONT; dspi->tx += tx_word + 1; dma->tx_desc = dmaengine_prep_slave_single(dma->chan_tx, -- 2.10.2