From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756217Ab1G2KxT (ORCPT ); Fri, 29 Jul 2011 06:53:19 -0400 Received: from eu1sys200aog110.obsmtp.com ([207.126.144.129]:41234 "EHLO eu1sys200aog110.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755946Ab1G2KuG (ORCPT ); Fri, 29 Jul 2011 06:50:06 -0400 From: Viresh Kumar To: Cc: , , , , , , , , , , , , , , , 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 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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: -- 1.7.2.2