[PATCH v3 13/13] OMAP: PM: DMA: Enable runtime pm

[G, Manjunath Kondaiah]

Enable runtime pm and use pm_runtime_get and pm_runtime_put
for OMAP DMA driver.

Signed-off-by: G, Manjunath Kondaiah <manjugk at ti.com>
Cc: Benoit Cousson <b-cousson at ti.com>
Cc: Kevin Hilman <khilman at deeprootsystems.com>
Cc: Santosh Shilimkar <santosh.shilimkar at ti.com>
---
 arch/arm/plat-omap/dma.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index 41b14b0..feac7ee 100644
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -35,6 +35,7 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
+#include <linux/pm_runtime.h>
 
 #include <asm/system.h>
 #include <mach/hardware.h>
@@ -367,6 +368,8 @@ int omap_request_dma(int dev_id, const char *dev_name,
 	chan = dma_chan + free_ch;
 	chan->dev_id = dev_id;
 
+	pm_runtime_get(&pd->dev);
+
 	if (d->dev_caps & IS_WORD_16)
 		p->clear_lch_regs(free_ch);
 	else
@@ -452,6 +455,7 @@ void omap_free_dma(int lch)
 		omap_clear_dma(lch);
 		p->clear_dma_sglist_mode(lch);
 	}
+	pm_runtime_put(&pd->dev);
 	spin_lock_irqsave(&dma_chan_lock, flags);
 	dma_chan[lch].dev_id = -1;
 	dma_chan[lch].next_lch = -1;
@@ -819,6 +823,11 @@ static int __devinit omap_system_dma_probe(struct platform_device *pdev)
 	dma_chan_count		= d->chan_count;
 	dma_chan		= d->chan;
 
+	/* Enable run time PM */
+	pm_runtime_enable(&pd->dev);
+
+	/* Accessing hw registers, get clock */
+	pm_runtime_get(&pd->dev);
 	for (ch = 0; ch < dma_chan_count; ch++) {
 		unsigned long flags;
 		omap_clear_dma(ch);
@@ -846,6 +855,10 @@ static int __devinit omap_system_dma_probe(struct platform_device *pdev)
 		dma_chan[0].dev_id = 0;
 		dma_chan[1].dev_id = 1;
 	}
+
+	if (!omap_dma_reserve_channels)
+		pm_runtime_put(&pd->dev);
+
 	return 0;
 
 exit_release_region:
-- 
1.7.1