On Mon, Mar 20, 2023 at 10:24:17AM +0200, Roger Quadros wrote:
> Hi,
>
> On 16/03/2023 15:12, Roger Quadros wrote:
> > Explicitly set and clear wakeup config so we don't leave anything
> > to chance.
> >
> > Clear wakeup status on suspend so we know what caused wake up.
> >
> > The LINESTATE wake up should not be enabled in device mode
> > if we are not connected to a USB host else it will cause spurious
> > wake up.
> >
> > Signed-off-by: Roger Quadros <rogerq@xxxxxxxxxx>
> > ---
> > drivers/usb/dwc3/dwc3-am62.c | 32 ++++++++++++++++++++++----------
> > 1 file changed, 22 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/usb/dwc3/dwc3-am62.c b/drivers/usb/dwc3/dwc3-am62.c
> > index 859b48279658..af0524e2f1e1 100644
> > --- a/drivers/usb/dwc3/dwc3-am62.c
> > +++ b/drivers/usb/dwc3/dwc3-am62.c
> > @@ -60,6 +60,13 @@
> > #define USBSS_WAKEUP_CFG_SESSVALID_EN BIT(1)
> > #define USBSS_WAKEUP_CFG_VBUSVALID_EN BIT(0)
> >
> > +#define USBSS_WAKEUP_CFG_ALL (USBSS_WAKEUP_CFG_VBUSVALID_EN | \
> > + USBSS_WAKEUP_CFG_SESSVALID_EN | \
> > + USBSS_WAKEUP_CFG_LINESTATE_EN | \
> > + USBSS_WAKEUP_CFG_OVERCURRENT_EN)
> > +
> > +#define USBSS_WAKEUP_CFG_NONE 0
> > +
> > /* WAKEUP STAT register bits */
> > #define USBSS_WAKEUP_STAT_OVERCURRENT BIT(4)
> > #define USBSS_WAKEUP_STAT_LINESTATE BIT(3)
> > @@ -103,6 +110,7 @@ struct dwc3_data {
> > struct regmap *syscon;
> > unsigned int offset;
> > unsigned int vbus_divider;
> > + u32 wakeup_stat;
> > };
> >
> > static const int dwc3_ti_rate_table[] = { /* in KHZ */
> > @@ -294,6 +302,7 @@ static int dwc3_ti_suspend_common(struct device *dev)
> > {
> > struct dwc3_data *data = dev_get_drvdata(dev);
> > u32 reg, current_prtcap_dir;
> > + u32 vbus_stat;
> >
> > if (device_may_wakeup(dev)) {
> > reg = dwc3_ti_readl(data, USBSS_CORE_STAT);
> > @@ -302,12 +311,20 @@ static int dwc3_ti_suspend_common(struct device *dev)
> > /* Set wakeup config enable bits */
> > reg = dwc3_ti_readl(data, USBSS_WAKEUP_CONFIG);
> > if (current_prtcap_dir == DWC3_GCTL_PRTCAP_HOST) {
> > - reg |= USBSS_WAKEUP_CFG_LINESTATE_EN | USBSS_WAKEUP_CFG_OVERCURRENT_EN;
> > + reg = USBSS_WAKEUP_CFG_LINESTATE_EN | USBSS_WAKEUP_CFG_OVERCURRENT_EN;
> > } else {
> > - reg |= USBSS_WAKEUP_CFG_OVERCURRENT_EN | USBSS_WAKEUP_CFG_LINESTATE_EN |
> > - USBSS_WAKEUP_CFG_VBUSVALID_EN;
> > + reg = USBSS_WAKEUP_CFG_VBUSVALID_EN | USBSS_WAKEUP_CFG_SESSVALID_EN;
> > + /*
> > + * Enable LINESTATE wake up only if connected to bus else
> > + * it causes spurious wake-up.
> > + */
> > + vbus_stat = dwc3_ti_readl(data, USBSS_VBUS_STAT);
> > + if (vbus_stat & (USBSS_VBUS_STAT_SESSVALID | USBSS_VBUS_STAT_VBUSVALID))
> > + reg |= USBSS_WAKEUP_CFG_LINESTATE_EN;
>
> There is one corner case where a spurious wake-up still happens.
> i.e. If we are not in USB_SUSPEND state while entering SoC sleep.
>
> So looks like we need to check if we are in USB SUSPEND before enabling
> LINESTATE wakeup enable.
Ok, I'll not apply this one, only the first 2 now.
thanks,
greg k-h
