dmaengine/amba-pl08x: support runtime PM

Insert notifiers for the runtime PM API. With this the runtime PM layer kicks in
to action where used.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index ead88c9a5e93139a498b9b56a1bdcf43318f1d31..5dd97f45092596ed4dc050bac477c46e745fc7ae 100644 (file)
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -84,6 +84,7 @@
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/pm_runtime.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <asm/hardware/pl080.h>
@@ -405,6 +406,7 @@ pl08x_get_phy_channel(struct pl08x_driver_data *pl08x,
                return NULL;
        }
 
+       pm_runtime_get_sync(&pl08x->adev->dev);
        return ch;
 }
 
@@ -418,6 +420,8 @@ static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x,
        /* Stop the channel and clear its interrupts */
        pl08x_terminate_phy_chan(pl08x, ch);
 
+       pm_runtime_put(&pl08x->adev->dev);
+
        /* Mark it as free */
        ch->serving = NULL;
        spin_unlock_irqrestore(&ch->lock, flags);
@@ -1855,6 +1859,9 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id)
                goto out_no_pl08x;
        }
 
+       pm_runtime_set_active(&adev->dev);
+       pm_runtime_enable(&adev->dev);
+
        /* Initialize memcpy engine */
        dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask);
        pl08x->memcpy.dev = &adev->dev;
@@ -1992,6 +1999,8 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id)
        dev_info(&pl08x->adev->dev, "DMA: PL%03x rev%u at 0x%08llx irq %d\n",
                 amba_part(adev), amba_rev(adev),
                 (unsigned long long)adev->res.start, adev->irq[0]);
+
+       pm_runtime_put(&adev->dev);
        return 0;
 
 out_no_slave_reg:
@@ -2010,6 +2019,9 @@ out_no_ioremap:
        dma_pool_destroy(pl08x->pool);
 out_no_lli_pool:
 out_no_platdata:
+       pm_runtime_put(&adev->dev);
+       pm_runtime_disable(&adev->dev);
+
        kfree(pl08x);
 out_no_pl08x:
        amba_release_regions(adev);