Hi Greg On 2019-08-08 11:41, Marek Szyprowski wrote: > Some PHYs (for example Exynos5 USB3.0 DRD PHY) require calibration to be > done after every USB HCD reset. Generic PHY framework has been already > extended with phy_calibrate() function in commit 36914111e682 ("drivers: > phy: add calibrate method"). This patch adds support for it to generic > PHY handling code in USB HCD core. > > Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com> > Tested-by: Anand Moon <linux.am...@gmail.com> > Tested-by: Jochen Sprickerhof <joc...@sprickerhof.de>
Greg: any chance to give it this a try in -next? If not, maybe You can point someone whose review will help? > --- > drivers/usb/core/hcd.c | 7 +++++++ > drivers/usb/core/phy.c | 21 +++++++++++++++++++++ > drivers/usb/core/phy.h | 1 + > 3 files changed, 29 insertions(+) > > diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c > index 88533938ce19..b89936c1df23 100644 > --- a/drivers/usb/core/hcd.c > +++ b/drivers/usb/core/hcd.c > @@ -2291,6 +2291,9 @@ int hcd_bus_resume(struct usb_device *rhdev, > pm_message_t msg) > hcd->state = HC_STATE_RESUMING; > status = hcd->driver->bus_resume(hcd); > clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags); > + if (status == 0) > + status = usb_phy_roothub_calibrate(hcd->phy_roothub); > + > if (status == 0) { > struct usb_device *udev; > int port1; > @@ -2864,6 +2867,10 @@ int usb_add_hcd(struct usb_hcd *hcd, > } > hcd->rh_pollable = 1; > > + retval = usb_phy_roothub_calibrate(hcd->phy_roothub); > + if (retval) > + goto err_hcd_driver_setup; > + > /* NOTE: root hub and controller capabilities may not be the same */ > if (device_can_wakeup(hcd->self.controller) > && device_can_wakeup(&hcd->self.root_hub->dev)) > diff --git a/drivers/usb/core/phy.c b/drivers/usb/core/phy.c > index 7580493b867a..fb1588e7c282 100644 > --- a/drivers/usb/core/phy.c > +++ b/drivers/usb/core/phy.c > @@ -151,6 +151,27 @@ int usb_phy_roothub_set_mode(struct usb_phy_roothub > *phy_roothub, > } > EXPORT_SYMBOL_GPL(usb_phy_roothub_set_mode); > > +int usb_phy_roothub_calibrate(struct usb_phy_roothub *phy_roothub) > +{ > + struct usb_phy_roothub *roothub_entry; > + struct list_head *head; > + int err; > + > + if (!phy_roothub) > + return 0; > + > + head = &phy_roothub->list; > + > + list_for_each_entry(roothub_entry, head, list) { > + err = phy_calibrate(roothub_entry->phy); > + if (err) > + return err; > + } > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(usb_phy_roothub_calibrate); > + > int usb_phy_roothub_power_on(struct usb_phy_roothub *phy_roothub) > { > struct usb_phy_roothub *roothub_entry; > diff --git a/drivers/usb/core/phy.h b/drivers/usb/core/phy.h > index dad564e2d2d4..20a267cd986b 100644 > --- a/drivers/usb/core/phy.h > +++ b/drivers/usb/core/phy.h > @@ -18,6 +18,7 @@ int usb_phy_roothub_exit(struct usb_phy_roothub > *phy_roothub); > > int usb_phy_roothub_set_mode(struct usb_phy_roothub *phy_roothub, > enum phy_mode mode); > +int usb_phy_roothub_calibrate(struct usb_phy_roothub *phy_roothub); > int usb_phy_roothub_power_on(struct usb_phy_roothub *phy_roothub); > void usb_phy_roothub_power_off(struct usb_phy_roothub *phy_roothub); > Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland