On Tue, Jan 24, 2023 at 09:44:34PM +0100, Michael Grzeschik wrote: > An mdelay of 1 seems to be necessary on some machines, since > the monsel status does not seem to be accurate. On rare occasions just > working with the phy after this pll check lead to no functional usb. > With this short mdelay this issue was not reported again. > > Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx> > --- > v1 -> v2: - reworded the comment > And updated to this one. Sascha > drivers/phy/phy-stm32-usbphyc.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/phy/phy-stm32-usbphyc.c b/drivers/phy/phy-stm32-usbphyc.c > index 657824405f..db4ccef920 100644 > --- a/drivers/phy/phy-stm32-usbphyc.c > +++ b/drivers/phy/phy-stm32-usbphyc.c > @@ -271,6 +271,15 @@ static int stm32_usbphyc_phy_init(struct phy *phy) > goto pll_disable; > } > > + /* This mdelay seems to be necessary on some machines, since the > + * monsel status does not seem to be accurate. On rare occasions > + * just working with the phy after this pll check the usb > + * peripheral (e.g. on the dwc2) run into timeout issues and > + * leading to no functional usb. With this short mdelay this > + * issue was not reported again. > + */ > + mdelay(1); > + > usbphyc_phy->active = true; > > return 0; > -- > 2.30.2 > > > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
