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Commit 1d99b259 authored by Chandana Kishori Chiluveru's avatar Chandana Kishori Chiluveru
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USB: ci13xxx_msm_hsic: Resume hardware from system resume path when needed 



If HSIC wakeup interrupt occurs in system suspend then instead of
requesting runtime_pm to resume the device defer it until pm_resume.
This is required due to runtime PM of a device is disabled until pm_resume.

If the bus is instead runtime suspended (and not system suspended) when a
wakeup event occurs, then normal runtime resume will bring the
hardware out of low power mode.

Change-Id: I692c5e46b21f92272f4baf4b9d35ca5b7afa7332
Signed-off-by: default avatarChandana Kishori Chiluveru <cchiluve@codeaurora.org>
parent b2b64139

drivers/usb/gadget/ci13xxx_msm_hsic.c

+37 −3
Original line number Diff line number Diff line
@@ -68,6 +68,9 @@ struct msm_hsic_per { 
	enum usb_vdd_type		vdd_type;

	bool				connected;

	bool				disable_on_boot;

	bool				sm_work_pending;

	atomic_t			pm_suspended;



};



#define NONE 0
@@ -581,22 +584,49 @@ skip_phy_resume: 
static int msm_hsic_pm_suspend(struct device *dev)

{

	struct msm_hsic_per *mhsic = dev_get_drvdata(dev);

	int ret = 0;



	dev_dbg(dev, "MSM HSIC Peripheral PM suspend\n");



	return msm_hsic_suspend(mhsic);

	if (!atomic_read(&mhsic->in_lpm)) {

		dev_err(dev, "Abort PM suspend!! (HSIC-USB is outside LPM)\n");

		return -EBUSY;

	}



	atomic_set(&mhsic->pm_suspended, 1);

	ret = msm_hsic_suspend(mhsic);

	if (ret)

		atomic_set(&mhsic->pm_suspended, 0);



	return ret;

}



#ifdef CONFIG_PM_RUNTIME

static int msm_hsic_pm_resume(struct device *dev)

{

	struct msm_hsic_per *mhsic = dev_get_drvdata(dev);

	int ret = 0;



	dev_dbg(dev, "MSM HSIC Peripheral PM resume\n");



	atomic_set(&mhsic->pm_suspended, 0);

	if (mhsic->sm_work_pending) {

		dev_dbg(dev, "MSM HSIC PM resume by USB\n");

		mhsic->sm_work_pending = false;

		pm_runtime_get_noresume(dev);

		ret = msm_hsic_resume(mhsic);



		/* Update runtime PM status */

		pm_runtime_disable(dev);

		pm_runtime_set_active(dev);

		pm_runtime_enable(dev);

	}



	/*

	 * Do not resume hardware as part of system resume,

	 * rather, wait for the ASYNC INT from the h/w

	 */

	return 0;

	return ret;

}

#else

static int msm_hsic_pm_resume(struct device *dev)
@@ -687,7 +717,11 @@ static irqreturn_t msm_udc_hsic_irq(int irq, void *data) 
		pr_debug("%s(): HSIC IRQ:%d in LPM\n", __func__, irq);

		disable_irq_nosync(irq);

		mhsic->async_int = irq;

		if (atomic_read(&mhsic->pm_suspended))

			mhsic->sm_work_pending = true;

		else

			pm_request_resume(mhsic->dev);



		return IRQ_HANDLED;

	}