Commit bb32baf7 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Rafael J. Wysocki
Browse files

dmaengine: dw: enable runtime PM 



On runtime PM aware platforms the DMA have to manage its own power state. This
patch enables runtime PM support and applies necessary calls wherever it's
needed.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: default avatarVinod Koul <vinod.koul@intel.com>
Tested-by: default avatarScott Ashcroft <scott.ashcroft@talk21.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 6c17ee44

drivers/dma/dw/core.c

+11 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <linux/mm.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/pm_runtime.h>



#include "../dmaengine.h"

#include "internal.h"
@@ -1504,6 +1505,9 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata) 
	dw->regs = chip->regs;

	chip->dw = dw;



	pm_runtime_enable(chip->dev);

	pm_runtime_get_sync(chip->dev);



	dw_params = dma_read_byaddr(chip->regs, DW_PARAMS);

	autocfg = dw_params >> DW_PARAMS_EN & 0x1;
@@ -1667,11 +1671,14 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata) 
	dev_info(chip->dev, "DesignWare DMA Controller, %d channels\n",

		 nr_channels);



	pm_runtime_put_sync_suspend(chip->dev);



	return 0;



err_dma_register:

	free_irq(chip->irq, dw);

err_pdata:

	pm_runtime_put_sync_suspend(chip->dev);

	return err;

}

EXPORT_SYMBOL_GPL(dw_dma_probe);
@@ -1681,6 +1688,8 @@ int dw_dma_remove(struct dw_dma_chip *chip) 
	struct dw_dma		*dw = chip->dw;

	struct dw_dma_chan	*dwc, *_dwc;



	pm_runtime_get_sync(chip->dev);



	dw_dma_off(dw);

	dma_async_device_unregister(&dw->dma);
@@ -1693,6 +1702,8 @@ int dw_dma_remove(struct dw_dma_chip *chip) 
		channel_clear_bit(dw, CH_EN, dwc->mask);

	}



	pm_runtime_put_sync_suspend(chip->dev);

	pm_runtime_disable(chip->dev);

	return 0;

}

EXPORT_SYMBOL_GPL(dw_dma_remove);