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    Subject[PATCH V3 08/20] dmaengine/amba-pl08x: support runtime PM
    Date
    Insert notifiers for the runtime PM API. With this the runtime PM layer kicks in
    to action where used. This will also handle enabling/disabling of interface
    clock (Code will be added in amba/bus.c by Russell King).

    Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
    ---
    drivers/dma/amba-pl08x.c | 17 +++++++++++++++++
    1 files changed, 17 insertions(+), 0 deletions(-)

    diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
    index 3fbaf0e..a829f0e 100644
    --- 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>
    @@ -879,11 +880,19 @@ static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x,
    */
    static int pl08x_alloc_chan_resources(struct dma_chan *chan)
    {
    + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
    + struct pl08x_driver_data *pl08x = plchan->host;
    +
    + pm_runtime_get_sync(&pl08x->adev->dev);
    return 0;
    }

    static void pl08x_free_chan_resources(struct dma_chan *chan)
    {
    + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
    + struct pl08x_driver_data *pl08x = plchan->host;
    +
    + pm_runtime_put_sync(&pl08x->adev->dev);
    }

    /*
    @@ -1855,6 +1864,9 @@ 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;
    @@ -1993,6 +2005,8 @@ 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_sync(&adev->dev);
    return 0;

    out_no_slave_reg:
    @@ -2011,6 +2025,9 @@ out_no_ioremap:
    dma_pool_destroy(pl08x->pool);
    out_no_lli_pool:
    out_no_platdata:
    + pm_runtime_put_sync(&adev->dev);
    + pm_runtime_disable(&adev->dev);
    +
    kfree(pl08x);
    out_no_pl08x:
    amba_release_regions(adev);
    --
    1.7.2.2


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