From patchwork Fri Jul 29 10:49:17 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Viresh KUMAR X-Patchwork-Id: 1019492 Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by demeter1.kernel.org (8.14.4/8.14.4) with ESMTP id p6TApURS003973 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 29 Jul 2011 10:51:51 GMT Received: from canuck.infradead.org ([134.117.69.58]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1Qmkex-0003JI-OO; Fri, 29 Jul 2011 10:51:17 +0000 Received: from localhost ([127.0.0.1] helo=canuck.infradead.org) by canuck.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1Qmkew-0006fO-HS; Fri, 29 Jul 2011 10:51:14 +0000 Received: from eu1sys200aog110.obsmtp.com ([207.126.144.129]) by canuck.infradead.org with smtps (Exim 4.76 #1 (Red Hat Linux)) id 1Qmkdp-0006Qt-Sy for linux-arm-kernel@lists.infradead.org; Fri, 29 Jul 2011 10:50:07 +0000 Received: from beta.dmz-ap.st.com ([138.198.100.35]) (using TLSv1) by eu1sys200aob110.postini.com ([207.126.147.11]) with SMTP ID DSNKTjKQS6GdG4stEuqSIEY+76gi0i5HbU1E@postini.com; Fri, 29 Jul 2011 10:50:05 UTC Received: from zeta.dmz-ap.st.com (ns6.st.com [138.198.234.13]) by beta.dmz-ap.st.com (STMicroelectronics) with ESMTP id 434FD102; Fri, 29 Jul 2011 10:49:45 +0000 (GMT) Received: from Webmail-ap.st.com (eapex1hubcas1.st.com [10.80.176.8]) by zeta.dmz-ap.st.com (STMicroelectronics) with ESMTP id F411CF17; Fri, 29 Jul 2011 10:49:44 +0000 (GMT) Received: from localhost (10.199.88.156) by Webmail-ap.st.com (10.80.176.7) with Microsoft SMTP Server (TLS) id 8.2.234.1; Fri, 29 Jul 2011 18:49:44 +0800 From: Viresh Kumar To: Subject: [PATCH 07/18] dmaengine/amba-pl08x: Enable/Disable amba_pclk with channel requests Date: Fri, 29 Jul 2011 16:19:17 +0530 Message-ID: <96781d46e41fa6ffc04b88527a25d73f5a59eda8.1311936524.git.viresh.kumar@st.com> X-Mailer: git-send-email 1.7.2.2 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20090807-BlameThorstenAndJenny ( TRE 0.7.6 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20110729_065006_250819_98D22AC7 X-CRM114-Status: GOOD ( 16.99 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.3.1 on canuck.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [207.126.144.129 listed in list.dnswl.org] Cc: pratyush.anand@st.com, rajeev-dlh.kumar@st.com, linux@arm.linux.org.uk, bhupesh.sharma@st.com, shiraz.hashim@st.com, vinod.koul@intel.com, linux-kernel@vger.kernel.org, vipin.kumar@st.com, armando.visconti@st.com, amit.virdi@st.com, vipulkumar.samar@st.com, viresh.linux@gmail.com, deepak.sikri@st.com, dan.j.williams@intel.com, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Fri, 29 Jul 2011 10:51:51 +0000 (UTC) Amba devices have interface clocks attached as adev->pclk. This is the only clock associated with DMAC and it can be disabled when DMAC is not in use. This patch adds support to enable/disable this clk as and when channels are requested and freed. Also it disables this clock at the end of probe. Signed-off-by: Viresh Kumar --- drivers/dma/amba-pl08x.c | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-) diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c index 53d722e..f1a25cf 100644 --- a/drivers/dma/amba-pl08x.c +++ b/drivers/dma/amba-pl08x.c @@ -881,11 +881,19 @@ static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x, */ static int pl08x_alloc_chan_resources(struct dma_chan *chan) { + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); + struct pl08x_driver_data *pl08x = plchan->host; + + amba_pclk_enable(pl08x->adev); return 0; } static void pl08x_free_chan_resources(struct dma_chan *chan) { + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); + struct pl08x_driver_data *pl08x = plchan->host; + + amba_pclk_disable(pl08x->adev); } /* @@ -1993,6 +2001,8 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) dev_info(&pl08x->adev->dev, "DMA: PL%03x rev%u at 0x%08llx irq %d\n", amba_part(adev), amba_rev(adev), (unsigned long long)adev->res.start, adev->irq[0]); + + amba_pclk_disable(adev); return 0; out_no_slave_reg: