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Commit fed57cd3 authored by Laxman Dewangan's avatar Laxman Dewangan Committed by Vinod Koul
Browse files

dma: tegra: enable/disable dma clock 



Enable the DMA clock when allocating channel and
disable clock when freeing channels.

Signed-off-by: default avatarLaxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@linux.intel.com>
parent dbde5c29

drivers/dma/tegra20-apb-dma.c

+17 −1
Original line number Diff line number Diff line
@@ -1119,15 +1119,21 @@ struct dma_async_tx_descriptor *tegra_dma_prep_dma_cyclic( 
static int tegra_dma_alloc_chan_resources(struct dma_chan *dc)

{

	struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);

	struct tegra_dma *tdma = tdc->tdma;

	int ret;



	dma_cookie_init(&tdc->dma_chan);

	tdc->config_init = false;

	return 0;

	ret = clk_prepare_enable(tdma->dma_clk);

	if (ret < 0)

		dev_err(tdc2dev(tdc), "clk_prepare_enable failed: %d\n", ret);

	return ret;

}



static void tegra_dma_free_chan_resources(struct dma_chan *dc)

{

	struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);

	struct tegra_dma *tdma = tdc->tdma;



	struct tegra_dma_desc *dma_desc;

	struct tegra_dma_sg_req *sg_req;
@@ -1163,6 +1169,7 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc) 
		list_del(&sg_req->node);

		kfree(sg_req);

	}

	clk_disable_unprepare(tdma->dma_clk);

}



/* Tegra20 specific DMA controller information */
@@ -1255,6 +1262,13 @@ static int __devinit tegra_dma_probe(struct platform_device *pdev) 
		}

	}



	/* Enable clock before accessing registers */

	ret = clk_prepare_enable(tdma->dma_clk);

	if (ret < 0) {

		dev_err(&pdev->dev, "clk_prepare_enable failed: %d\n", ret);

		goto err_pm_disable;

	}



	/* Reset DMA controller */

	tegra_periph_reset_assert(tdma->dma_clk);

	udelay(2);
@@ -1265,6 +1279,8 @@ static int __devinit tegra_dma_probe(struct platform_device *pdev) 
	tdma_write(tdma, TEGRA_APBDMA_CONTROL, 0);

	tdma_write(tdma, TEGRA_APBDMA_IRQ_MASK_SET, 0xFFFFFFFFul);



	clk_disable_unprepare(tdma->dma_clk);



	INIT_LIST_HEAD(&tdma->dma_dev.channels);

	for (i = 0; i < cdata->nr_channels; i++) {

		struct tegra_dma_channel *tdc = &tdma->channels[i];