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Commit 20f2a3b5 authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Paul Mundt
Browse files

dmaengine: shdma: add runtime PM support. 



Provided platforms implement runtime PM, this disables the controller, when not
in use.

Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 8b1935e6

drivers/dma/shdma.c

+20 −0
Original line number Diff line number Diff line
@@ -24,7 +24,10 @@ 
#include <linux/delay.h>

#include <linux/dma-mapping.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>



#include <asm/dmaengine.h>



#include "shdma.h"



/* DMA descriptor control */
@@ -287,6 +290,8 @@ static int sh_dmae_alloc_chan_resources(struct dma_chan *chan) 
	struct sh_desc *desc;

	struct sh_dmae_slave *param = chan->private;



	pm_runtime_get_sync(sh_chan->dev);



	/*

	 * This relies on the guarantee from dmaengine that alloc_chan_resources

	 * never runs concurrently with itself or free_chan_resources.
@@ -328,6 +333,9 @@ static int sh_dmae_alloc_chan_resources(struct dma_chan *chan) 
	}

	spin_unlock_bh(&sh_chan->desc_lock);



	if (!sh_chan->descs_allocated)

		pm_runtime_put(sh_chan->dev);



	return sh_chan->descs_allocated;

}
@@ -339,6 +347,7 @@ static void sh_dmae_free_chan_resources(struct dma_chan *chan) 
	struct sh_dmae_chan *sh_chan = to_sh_chan(chan);

	struct sh_desc *desc, *_desc;

	LIST_HEAD(list);

	int descs = sh_chan->descs_allocated;



	dmae_halt(sh_chan);
@@ -359,6 +368,9 @@ static void sh_dmae_free_chan_resources(struct dma_chan *chan) 


	spin_unlock_bh(&sh_chan->desc_lock);



	if (descs > 0)

		pm_runtime_put(sh_chan->dev);



	list_for_each_entry_safe(desc, _desc, &list, node)

		kfree(desc);

}
@@ -978,6 +990,9 @@ static int __init sh_dmae_probe(struct platform_device *pdev) 
	/* platform data */

	shdev->pdata = pdata;



	pm_runtime_enable(&pdev->dev);

	pm_runtime_get_sync(&pdev->dev);



	/* reset dma controller */

	err = sh_dmae_rst(shdev);

	if (err)
@@ -1066,6 +1081,8 @@ static int __init sh_dmae_probe(struct platform_device *pdev) 
			goto chan_probe_err;

	}



	pm_runtime_put(&pdev->dev);



	platform_set_drvdata(pdev, shdev);

	dma_async_device_register(&shdev->common);
@@ -1079,6 +1096,7 @@ static int __init sh_dmae_probe(struct platform_device *pdev) 
eirq_err:

#endif

rst_err:

	pm_runtime_put(&pdev->dev);

	if (dmars)

		iounmap(shdev->dmars);

emapdmars:
@@ -1108,6 +1126,8 @@ static int __exit sh_dmae_remove(struct platform_device *pdev) 
	/* channel data remove */

	sh_dmae_chan_remove(shdev);



	pm_runtime_disable(&pdev->dev);



	if (shdev->dmars)

		iounmap(shdev->dmars);

	iounmap(shdev->chan_reg);