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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2014-11-05 18:34:48 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-11-11 23:44:19 +0100
commitbb32baf76e56cdb348633f4d789a93e81b975c47 (patch)
tree130155378cd033a9c1ea1f17578a56af0af23a26 /drivers/dma
parent6c17ee44d5240a247daef3cdc51a0c62d2b77d75 (diff)
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: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Vinod Koul <vinod.koul@intel.com> Tested-by: Scott Ashcroft <scott.ashcroft@talk21.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/dw/core.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index 244722170410..380478562b7d 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -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);