Enable runtime pm and use pm_runtime_get and pm_runtime_put
for OMAP DMA driver.
Signed-off-by: G, Manjunath Kondaiah <manjugk@xxxxxx>
Cc: Benoit Cousson <b-cousson@xxxxxx>
Cc: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx>
Cc: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
---
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
--
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