From patchwork Fri Jun 19 14:33:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 223638 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=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 5DC8DC433DF for ; Fri, 19 Jun 2020 16:51:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3C659206E2 for ; Fri, 19 Jun 2020 16:51:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592585484; bh=pSRDgmG0ba2RA1IwIzE5zt3UdeXFTHQ9NQCrRLyhAHY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=O1JRA5Y/rUyqAh+YINjlLPfDFYla8/zlx/Gryn8fZ1cTkCGwq15DomvkbqO9aCFD1 h6xeWwgf/dOKM8N6RgerbcwYallxWurZ4E/SM7Naig57z7cR6IyMJV7I+S2wXkQa0b I3GaAMw/VDGAzyMXtjX/u1JmJfgZ9sNsAMEemzxo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403965AbgFSQvO (ORCPT ); Fri, 19 Jun 2020 12:51:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:55302 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387843AbgFSOiR (ORCPT ); Fri, 19 Jun 2020 10:38:17 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9EAC4208B8; Fri, 19 Jun 2020 14:38:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592577496; bh=pSRDgmG0ba2RA1IwIzE5zt3UdeXFTHQ9NQCrRLyhAHY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yyIkv19H5VjrEtr6J40xThYVy4bZAE1HbJy5wgkCyPkpoiFKGkFDN4ILWm2n4sJnY SGUskCVDXibsEve7jbiKx+Rkg9f9Whl8UJl0NLnJ/z/fIXigTOZB4w3u79x7WdomCN D5twW40d0DgpTlQ39s6f08NFyy+MLm9vHtsP07X0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Serge Semin , Georgy Vlasov , Ramil Zaripov , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Andy Shevchenko , Feng Tang , Rob Herring , linux-mips@vger.kernel.org, devicetree@vger.kernel.org, Mark Brown , Sasha Levin Subject: [PATCH 4.4 074/101] spi: dw: Return any value retrieved from the dma_transfer callback Date: Fri, 19 Jun 2020 16:33:03 +0200 Message-Id: <20200619141617.896153836@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200619141614.001544111@linuxfoundation.org> References: <20200619141614.001544111@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Serge Semin [ Upstream commit f0410bbf7d0fb80149e3b17d11d31f5b5197873e ] DW APB SSI DMA-part of the driver may need to perform the requested SPI-transfer synchronously. In that case the dma_transfer() callback will return 0 as a marker of the SPI transfer being finished so the SPI core doesn't need to wait and may proceed with the SPI message trasnfers pumping procedure. This will be needed to fix the problem when DMA transactions are finished, but there is still data left in the SPI Tx/Rx FIFOs being sent/received. But for now make dma_transfer to return 1 as the normal dw_spi_transfer_one() method. Signed-off-by: Serge Semin Cc: Georgy Vlasov Cc: Ramil Zaripov Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Andy Shevchenko Cc: Feng Tang Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org Link: https://lore.kernel.org/r/20200529131205.31838-3-Sergey.Semin@baikalelectronics.ru Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-dw-mid.c | 2 +- drivers/spi/spi-dw.c | 7 ++----- 2 files changed, 3 insertions(+), 6 deletions(-) diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index bd116f117b02..14902efae621 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -274,7 +274,7 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer) dma_async_issue_pending(dws->txchan); } - return 0; + return 1; } static void mid_spi_dma_stop(struct dw_spi *dws) diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index 295249843e7c..8076fa708b24 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -385,11 +385,8 @@ static int dw_spi_transfer_one(struct spi_master *master, spi_enable_chip(dws, 1); - if (dws->dma_mapped) { - ret = dws->dma_ops->dma_transfer(dws, transfer); - if (ret < 0) - return ret; - } + if (dws->dma_mapped) + return dws->dma_ops->dma_transfer(dws, transfer); if (chip->poll_mode) return poll_transfer(dws);