From patchwork Mon Nov 21 05:54:02 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sanchayan X-Patchwork-Id: 9438781 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id CEFE1600BA for ; Mon, 21 Nov 2016 06:03:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C256028984 for ; Mon, 21 Nov 2016 06:03:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B6C842898B; Mon, 21 Nov 2016 06:03:25 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.3 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E530D28988 for ; Mon, 21 Nov 2016 06:03:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753264AbcKUGDT (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 Received: by mail-pf0-f196.google.com with SMTP id i88so17563739pfk.2; Sun, 20 Nov 2016 22:03:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=dhtX0rOIdmZqDJhRQ17/G5l1K4RrPbKNopsBFCUWHw0=; b=mn6fdZX+CgdIUcG9xs9GvLHVxisKcR4a0GgJ8l382/TRFm8OBtVMSf1ove+VRw2WMU aTMrcXxxuZIoOA89lj3E/ehSDCN5/KAO2O84LmJTmacG6gBOJr+MtW1vPdona0B8FdAl aYEFHEtJf/7n/J7rZhQKsYreqEpwjlueKjKiBwsU+rpRLbYKabCSS3pU26/3b5AcDSNs ZSV9138v1hwB3GJp8dc9bB/YE1etGtwh7uyq3dbt7T619yvLcSnrTU9v6wfrWgz92/tT S7aeb3ydEMXZmPmLI6KfwVakWNPpfI05/7ljMz3K/BNg7koZedfXC4YRoJtT3d9hjHyq 4aeQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=dhtX0rOIdmZqDJhRQ17/G5l1K4RrPbKNopsBFCUWHw0=; b=C2V0H/XG8tUdhcUgmscS7Z/rOq32HJrD3ywvlGYNEnMkTLakYAKKuZamzE/SNudz7x 4YSzho9RgiWoUclNNY/kV7vfwnl6Bk4Ii4TeyoyYb1yQg6ySPfm6gXfdALRR4xXCvhBN Ocsq/dmtbNnl83TbldoRUINIeo2p/bzn9xX2w2ZADXNtdi5yTJO3Mvfhqs+Z+hZPtXu7 KNCXYJg6mAYQNzdZ3be1uIahmVlEwq0gKmowScdgc7GaQ4E2uqz40nbjxH6KZ4KzfH8J 1NIoH/zmHDBWLPnkwxMUQnevTrSLien/ZU9ilQ/gTz/lOlpRclezYN5x1apfF8eU0+SF smXw== X-Gm-Message-State: AKaTC03/rIQo1Dm6JtJ/nBNw1DtR86PCwTjFxqrvY+Qo4gfyNN2XCJJbIp4JQIgGGh4m9Q== X-Received: by 10.99.5.21 with SMTP id 21mr28602666pgf.32.1479708194562; Sun, 20 Nov 2016 22:03:14 -0800 (PST) Received: from localhost ([115.115.243.34]) by smtp.gmail.com with ESMTPSA id i194sm16018832pgc.46.2016.11.20.22.03.13 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 20 Nov 2016 22:03:14 -0800 (PST) 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-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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,