From patchwork Sun Sep 20 11:23:19 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 258195 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A32CFC43466 for ; Sun, 20 Sep 2020 11:32:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6EB0020EDD for ; Sun, 20 Sep 2020 11:32:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726338AbgITLc1 (ORCPT ); Sun, 20 Sep 2020 07:32:27 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:54044 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726279AbgITLc0 (ORCPT ); Sun, 20 Sep 2020 07:32:26 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id CE1C7803017C; Sun, 20 Sep 2020 11:23:30 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QHf1cNj_oOvJ; Sun, 20 Sep 2020 14:23:30 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Alexey Malahov , Georgy Vlasov , Ramil Zaripov , Pavel Parkhomenko , Peter Ujfalusi , Andy Shevchenko , Andy Shevchenko , Feng Tang , Vinod Koul , , Subject: [PATCH v2 08/11] spi: dw-dma: Detach DMA transfer into a dedicated method Date: Sun, 20 Sep 2020 14:23:19 +0300 Message-ID: <20200920112322.24585-9-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200920112322.24585-1-Sergey.Semin@baikalelectronics.ru> References: <20200920112322.24585-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org In order to add an alternative method of DMA-based SPI transfer first we need to detach the currently available one from the common code. Here we move the normal DMA-based SPI transfer execution functionality into a dedicated method. It will be utilized if either the DMA engine supports an unlimited number SG entries or Tx-only SPI transfer is requested. But currently just use it for any SPI transfer. Signed-off-by: Serge Semin --- drivers/spi/spi-dw-dma.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-dw-dma.c b/drivers/spi/spi-dw-dma.c index 9f70818acce6..f2baefcae9ae 100644 --- a/drivers/spi/spi-dw-dma.c +++ b/drivers/spi/spi-dw-dma.c @@ -441,7 +441,8 @@ static int dw_spi_dma_setup(struct dw_spi *dws, struct spi_transfer *xfer) return 0; } -static int dw_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer) +static int dw_spi_dma_transfer_all(struct dw_spi *dws, + struct spi_transfer *xfer) { int ret; @@ -462,7 +463,14 @@ static int dw_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer) dma_async_issue_pending(dws->txchan); - ret = dw_spi_dma_wait(dws, xfer); + return dw_spi_dma_wait(dws, xfer); +} + +static int dw_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer) +{ + int ret; + + ret = dw_spi_dma_transfer_all(dws, xfer); if (ret) return ret;