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    Subject[PATCH v2 2/2] ata: ahci_platform: runtime resume the device before use
    Date
    On OMAP platforms the device needs to be runtime resumed before
    it can be accessed. The OMAP HWMOD framework takes care of
    enabling the module and its resources based on the
    device's runtime PM state.

    In this patch we runtime resume during .probe() and runtime suspend
    during .remove() (i.e. ahci_host_stop()).

    We also update the runtime PM state during .resume().

    Signed-off-by: Roger Quadros <rogerq@ti.com>
    Signed-off-by: Balaji T K <balajitk@ti.com>
    ---
    drivers/ata/ahci_platform.c | 12 ++++++++++++
    1 file changed, 12 insertions(+)

    diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
    index 5a0f1418..0da3b95 100644
    --- a/drivers/ata/ahci_platform.c
    +++ b/drivers/ata/ahci_platform.c
    @@ -23,6 +23,7 @@
    #include <linux/platform_device.h>
    #include <linux/libata.h>
    #include <linux/ahci_platform.h>
    +#include <linux/pm_runtime.h>
    #include "ahci.h"

    static void ahci_host_stop(struct ata_host *host);
    @@ -141,6 +142,9 @@ static int ahci_probe(struct platform_device *pdev)
    }
    }

    + pm_runtime_enable(dev);
    + pm_runtime_get_sync(dev);
    +
    hpriv->phy = devm_phy_get(dev, "sata-phy");
    if (IS_ERR(hpriv->phy)) {
    dev_dbg(dev, "can't get sata-phy\n");
    @@ -268,6 +272,9 @@ static void ahci_host_stop(struct ata_host *host)
    clk_disable_unprepare(hpriv->clk);
    clk_put(hpriv->clk);
    }
    +
    + pm_runtime_put_sync(dev);
    + pm_runtime_disable(dev);
    }

    #ifdef CONFIG_PM_SLEEP
    @@ -339,6 +346,11 @@ static int ahci_resume(struct device *dev)

    ata_host_resume(host);

    + /* We resumed so update PM runtime state */
    + pm_runtime_disable(dev);
    + pm_runtime_set_active(dev);
    + pm_runtime_enable(dev);
    +
    return 0;

    disable_unprepare_clk:
    --
    1.7.9.5


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