From patchwork Fri Dec 12 10:36:53 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ludovic Desroches X-Patchwork-Id: 5481681 Return-Path: X-Original-To: patchwork-linux-arm@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 117C7BEEA8 for ; Fri, 12 Dec 2014 10:39:57 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 35F4D201C8 for ; Fri, 12 Dec 2014 10:39:55 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CEDF32017D for ; Fri, 12 Dec 2014 10:39:53 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XzNbX-0001wW-Sj; Fri, 12 Dec 2014 10:37:47 +0000 Received: from eusmtp01.atmel.com ([212.144.249.242]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XzNbR-0001rD-Uq for linux-arm-kernel@lists.infradead.org; Fri, 12 Dec 2014 10:37:42 +0000 Received: from ibiza.corp.atmel.com (10.161.101.13) by eusmtp01.atmel.com (10.161.101.30) with Microsoft SMTP Server id 14.2.347.0; Fri, 12 Dec 2014 11:37:13 +0100 From: Ludovic Desroches To: , Subject: [PATCH v2 2/4] dmaengine: at_xdmac: introduce save_cc field Date: Fri, 12 Dec 2014 11:36:53 +0100 Message-ID: <1418380615-12171-3-git-send-email-ludovic.desroches@atmel.com> X-Mailer: git-send-email 2.0.3 In-Reply-To: <1418380615-12171-1-git-send-email-ludovic.desroches@atmel.com> References: <1418380615-12171-1-git-send-email-ludovic.desroches@atmel.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20141212_023742_202114_91AF647C X-CRM114-Status: UNSURE ( 8.55 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.0 (/) Cc: vinod.koul@intel.com, cyrille.pitchen@atmel.com, Ludovic Desroches , nicolas.ferre@atmel.com X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, 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 When suspending the device, read the channel configuration directly from the register instead of relying on a software snapshot, it will be safer. Signed-off-by: Ludovic Desroches --- drivers/dma/at_xdmac.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index bc4b018..5c4f877 100644 --- a/drivers/dma/at_xdmac.c +++ b/drivers/dma/at_xdmac.c @@ -200,6 +200,7 @@ struct at_xdmac_chan { u8 memif; /* Memory Interface */ u32 per_src_addr; u32 per_dst_addr; + u32 save_cc; u32 save_cim; u32 save_cnda; u32 save_cndc; @@ -1276,6 +1277,7 @@ static int atmel_xdmac_suspend(struct device *dev) list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + atchan->save_cc = at_xdmac_chan_read(atchan, AT_XDMAC_CC); if (at_xdmac_chan_is_cyclic(atchan)) { if (!at_xdmac_chan_is_paused(atchan)) at_xdmac_device_pause(chan); @@ -1298,7 +1300,6 @@ static int atmel_xdmac_resume(struct device *dev) struct at_xdmac_chan *atchan; struct dma_chan *chan, *_chan; int i; - u32 cfg; clk_prepare_enable(atxdmac->clk); @@ -1313,8 +1314,7 @@ static int atmel_xdmac_resume(struct device *dev) at_xdmac_write(atxdmac, AT_XDMAC_GE, atxdmac->save_gs); list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { atchan = to_at_xdmac_chan(chan); - cfg = atchan->cfg[AT_XDMAC_CUR_CFG]; - at_xdmac_chan_write(atchan, AT_XDMAC_CC, cfg); + at_xdmac_chan_write(atchan, AT_XDMAC_CC, atchan->save_cc); if (at_xdmac_chan_is_cyclic(atchan)) { at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, atchan->save_cnda); at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, atchan->save_cndc);