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>
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index 2447221..3804785 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 @@
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 @@
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 @@
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 @@
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);