From patchwork Thu Jun 30 15:15:16 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Niklas_S=C3=B6derlund?= X-Patchwork-Id: 9208427 X-Patchwork-Delegate: geert@linux-m68k.org 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 71A5D6075F for ; Thu, 30 Jun 2016 15:26:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8108128685 for ; Thu, 30 Jun 2016 15:25:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 75E1F28687; Thu, 30 Jun 2016 15:25:54 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI 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 BB68E2868D for ; Thu, 30 Jun 2016 15:25:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932450AbcF3PZi (ORCPT ); Thu, 30 Jun 2016 11:25:38 -0400 Received: from smtp-3.sys.kth.se ([130.237.48.192]:54541 "EHLO smtp-3.sys.kth.se" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932451AbcF3PZJ (ORCPT ); Thu, 30 Jun 2016 11:25:09 -0400 Received: from smtp-3.sys.kth.se (localhost.localdomain [127.0.0.1]) by smtp-3.sys.kth.se (Postfix) with ESMTP id 16E5D2A59; Thu, 30 Jun 2016 17:15:39 +0200 (CEST) X-Virus-Scanned: by amavisd-new at kth.se Received: from smtp-3.sys.kth.se ([127.0.0.1]) by smtp-3.sys.kth.se (smtp-3.sys.kth.se [127.0.0.1]) (amavisd-new, port 10024) with LMTP id GPtpA5zok7IQ; Thu, 30 Jun 2016 17:15:36 +0200 (CEST) X-KTH-Auth: niso [89.233.230.99] X-KTH-mail-from: niklas.soderlund+renesas@ragnatech.se Received: from bismarck.berto.se (unknown [89.233.230.99]) by smtp-3.sys.kth.se (Postfix) with ESMTPSA id 408631022; Thu, 30 Jun 2016 17:15:36 +0200 (CEST) From: =?UTF-8?q?Niklas=20S=C3=B6derlund?= To: dmaengine@vger.kernel.org, linux-renesas-soc@vger.kernel.org Cc: vinod.koul@intel.com, geert+renesas@glider.be, laurent.pinchart+renesas@ideasonboard.com, mfarooq@visteon.com, =?UTF-8?q?Niklas=20S=C3=B6derlund?= Subject: [PATCHv2 2/4] dmaengine: rcar-dmac: warn if transfer cannot start as TE = 1 Date: Thu, 30 Jun 2016 17:15:16 +0200 Message-Id: <20160630151518.32329-3-niklas.soderlund+renesas@ragnatech.se> X-Mailer: git-send-email 2.9.0 In-Reply-To: <20160630151518.32329-1-niklas.soderlund+renesas@ragnatech.se> References: <20160630151518.32329-1-niklas.soderlund+renesas@ragnatech.se> MIME-Version: 1.0 Sender: linux-renesas-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The documentation states one should make sure both DE and TE are cleared before starting a transaction. This patch extends the current warning to look at both DE and TE. Based on previous work from Muhammad Hamza Farooq. Suggested-by: Muhammad Hamza Farooq Signed-off-by: Niklas Söderlund Acked-by: Laurent Pinchart --- drivers/dma/sh/rcar-dmac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c index 791a064..7f26576 100644 --- a/drivers/dma/sh/rcar-dmac.c +++ b/drivers/dma/sh/rcar-dmac.c @@ -311,7 +311,7 @@ static bool rcar_dmac_chan_is_busy(struct rcar_dmac_chan *chan) { u32 chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR); - return (chcr & (RCAR_DMACHCR_DE | RCAR_DMACHCR_TE)) == RCAR_DMACHCR_DE; + return !!(chcr & (RCAR_DMACHCR_DE | RCAR_DMACHCR_TE)); } static void rcar_dmac_chan_start_xfer(struct rcar_dmac_chan *chan)