From patchwork Thu Mar 13 09:18:29 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Ujfalusi X-Patchwork-Id: 3823581 X-Patchwork-Delegate: vinod.koul@intel.com Return-Path: X-Original-To: patchwork-dmaengine@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 3FD04BF540 for ; Thu, 13 Mar 2014 09:23:50 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 6F63B2020A for ; Thu, 13 Mar 2014 09:23:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 85218201BB for ; Thu, 13 Mar 2014 09:23:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753722AbaCMJTw (ORCPT ); Thu, 13 Mar 2014 05:19:52 -0400 Received: from devils.ext.ti.com ([198.47.26.153]:33046 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753713AbaCMJTs (ORCPT ); Thu, 13 Mar 2014 05:19:48 -0400 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id s2D9JC6L004935; Thu, 13 Mar 2014 04:19:12 -0500 Received: from DLEE70.ent.ti.com (dlemailx.itg.ti.com [157.170.170.113]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id s2D9JC9U031479; Thu, 13 Mar 2014 04:19:12 -0500 Received: from dflp32.itg.ti.com (10.64.6.15) by DLEE70.ent.ti.com (157.170.170.113) with Microsoft SMTP Server id 14.3.174.1; Thu, 13 Mar 2014 04:19:12 -0500 Received: from dflp32.itg.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id s2D9Ifhc005531; Thu, 13 Mar 2014 04:19:09 -0500 From: Peter Ujfalusi To: , , , , CC: , , Mark Brown , Liam Girdwood , Tony Lindgren , , Jyri Sarha , , , Subject: [PATCH 07/18] DMA: edma: Use different eventq for cyclic channels Date: Thu, 13 Mar 2014 11:18:29 +0200 Message-ID: <1394702320-21743-8-git-send-email-peter.ujfalusi@ti.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1394702320-21743-1-git-send-email-peter.ujfalusi@ti.com> References: <1394702320-21743-1-git-send-email-peter.ujfalusi@ti.com> MIME-Version: 1.0 Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP To improve latency with cyclic DMA operation it is preferred to use different eventq/tc than the default which is used by all other drivers (mmc, spi, i2c, etc). When preparing the cyclic dma ask for non default queue for the channel which is going to be used with cyclic mode. Signed-off-by: Peter Ujfalusi --- drivers/dma/edma.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c index 86d6a3fb0d92..604c7c94c731 100644 --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -624,6 +624,9 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic( edesc->pset[i].opt |= TCINTEN; } + /* Use different eventq/tc for cyclic DMA to reduce latency */ + edma_request_non_default_queue(echan->ch_num); + return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags); }