From mboxrd@z Thu Jan 1 00:00:00 1970 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=-6.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham 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 3CF24C31E40 for ; Sat, 3 Aug 2019 10:38:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1853A2166E for ; Sat, 3 Aug 2019 10:38:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388325AbfHCKih (ORCPT ); Sat, 3 Aug 2019 06:38:37 -0400 Received: from mailout2.hostsharing.net ([83.223.78.233]:49753 "EHLO mailout2.hostsharing.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727123AbfHCKih (ORCPT ); Sat, 3 Aug 2019 06:38:37 -0400 X-Greylist: delayed 593 seconds by postgrey-1.27 at vger.kernel.org; Sat, 03 Aug 2019 06:38:36 EDT Received: from h08.hostsharing.net (h08.hostsharing.net [83.223.95.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "*.hostsharing.net", Issuer "COMODO RSA Domain Validation Secure Server CA" (not verified)) by mailout2.hostsharing.net (Postfix) with ESMTPS id B366510189B93; Sat, 3 Aug 2019 12:28:41 +0200 (CEST) Received: from localhost (unknown [89.246.108.87]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by h08.hostsharing.net (Postfix) with ESMTPSA id 707BC618EDF5; Sat, 3 Aug 2019 12:28:41 +0200 (CEST) X-Mailbox-Line: From 7b67f8d95154d25b3a360f580f1ca61f83f79a6f Mon Sep 17 00:00:00 2001 Message-Id: <7b67f8d95154d25b3a360f580f1ca61f83f79a6f.1564825752.git.lukas@wunner.de> In-Reply-To: References: From: Lukas Wunner Date: Sat, 3 Aug 2019 12:10:00 +0200 Subject: [PATCH 01/10] dmaengine: bcm2835: Allow reusable descriptors MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit To: Mark Brown , Vinod Koul , Stefan Wahren , linux-spi@vger.kernel.org, dmaengine@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, bcm-kernel-feedback-list@broadcom.com Cc: Eric Anholt , Nuno Sa , Martin Sperl , Noralf Tronnes , Robert Jarzmik , Florian Kauer , Florian Fainelli , Ray Jui , Scott Branden Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org The DMA engine API requires DMA drivers to explicitly allow that descriptors are prepared once and reused multiple times. Only a single driver makes use of this functionality so far (pxa_dma.c, to speed up pxa_camera.c). We're about to add another use case for reusable descriptors in the BCM2835 SPI driver, so allow that in the BCM2835 DMA driver. Tested-by: Nuno Sá Signed-off-by: Lukas Wunner Cc: Martin Sperl Cc: Florian Kauer Cc: Robert Jarzmik --- drivers/dma/bcm2835-dma.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c index 8101ff2f05c1..523c507ad69e 100644 --- a/drivers/dma/bcm2835-dma.c +++ b/drivers/dma/bcm2835-dma.c @@ -907,6 +907,7 @@ static int bcm2835_dma_probe(struct platform_device *pdev) od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) | BIT(DMA_MEM_TO_MEM); od->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + od->ddev.descriptor_reuse = true; od->ddev.dev = &pdev->dev; INIT_LIST_HEAD(&od->ddev.channels); -- 2.20.1