16.12.2020 11:51, Sergei Shtylyov пишет: > Hello! > > On 15.12.2020 23:21, Dmitry Osipenko wrote: > >> The PHY hardware needs the delay of 2ms after power up, otherwise initial >> interrupt may be lost if USB controller is accessed before PHY is settled >> down. Previously this issue was masked by implicit delays, but now it >> pops >> up after squashing the older ehci-tegra driver into the ChipIdea driver. >> >> Tested-by: Matt Merhar <mattmerhar@xxxxxxxxxxxxxx> >> Tested-by: Nicolas Chauvet <kwizart@xxxxxxxxx> >> Tested-by: Peter Geis <pgwipeout@xxxxxxxxx> >> Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx> >> --- >> drivers/usb/phy/phy-tegra-usb.c | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/drivers/usb/phy/phy-tegra-usb.c >> b/drivers/usb/phy/phy-tegra-usb.c >> index 03a333797382..cee9c9dbb775 100644 >> --- a/drivers/usb/phy/phy-tegra-usb.c >> +++ b/drivers/usb/phy/phy-tegra-usb.c >> @@ -784,6 +784,9 @@ static int tegra_usb_phy_power_on(struct >> tegra_usb_phy *phy) >> phy->powered_on = true; >> + /* let PHY to settle down */ > > Let the PHY settle down. Hi, I'll improve the comments in v2, thanks.
