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MLK-23412-5 usb: dwc3: imx8mp: disable u3 wakeup if usb may not wakeup 

As there is an IC issue on rx idle signal isolation value, to avoid
unexpected wakeup event if hsiomix off + u3 wakeup enable, we have
below assumptions:
1. hsiomix power domain will be always on at runtime runtime.
2. if usb is enabled as system wakeup source, hsiomix will be on while
   system sleep.

So we keep u3 wakeup enable at runtime for simple, and disable u3 wakeup
if usb is not the system wakeup source when sleep.

Reviewed-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Li Jun <jun.li@nxp.com>
5.4-rM2-2.2.x-imx-squashed
Li Jun 2020-03-20 15:14:14 +08:00
parent 28adce9c08
commit 039a6e0694
1 changed files with 16 additions and 1 deletions
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17
drivers/usb/dwc3/dwc3-imx8mp.c
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@ -73,6 +73,16 @@ static void dwc_imx8mp_wakeup_disable(struct dwc3_imx8mp *dwc_imx)
writel(val, dwc_imx->glue_base + USB_WAKEUP_CTRL);
}
/* U3 wakeup enable only if hsiomix will not be off */
static void dwc_imx8mp_wakeup_disable_u3(struct dwc3_imx8mp *dwc_imx)
{
u32 val;
val = readl(dwc_imx->glue_base + USB_WAKEUP_CTRL);
val &= ~USB_WAKEUP_U3_EN;
writel(val, dwc_imx->glue_base + USB_WAKEUP_CTRL);
}
static irqreturn_t dwc3_imx8mp_interrupt(int irq, void *_dwc_imx)
{
struct dwc3_imx8mp *dwc_imx = _dwc_imx;
@ -281,11 +291,16 @@ static int dwc3_imx8mp_resume(struct dwc3_imx8mp *dwc, pm_message_t msg)
static int __maybe_unused dwc3_imx8mp_pm_suspend(struct device *dev)
{
struct dwc3_imx8mp *dwc_imx = dev_get_drvdata(dev);
int ret;
ret = dwc3_imx8mp_suspend(dwc_imx, PMSG_SUSPEND);
if (device_may_wakeup(dwc_imx->dev))
enable_irq_wake(dwc_imx->irq);
else
dwc_imx8mp_wakeup_disable_u3(dwc_imx);
return dwc3_imx8mp_suspend(dwc_imx, PMSG_SUSPEND);
return ret;
}
static int __maybe_unused dwc3_imx8mp_pm_resume(struct device *dev)