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usb: core: phy: add support for PHY calibration 

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 36914111e6 ("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.szyprowski@samsung.com>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Tested-by: Jochen Sprickerhof <jochen@sprickerhof.de>
Link: https://lore.kernel.org/r/20190829053028.32438-2-m.szyprowski@samsung.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marek Szyprowski 2019-08-29 07:30:27 +02:00 committed by Greg Kroah-Hartman
parent d7290cd04b
commit 34c7ed72f4
3 changed files with 29 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/usb/core/hcd.c
View File

@ -2188,6 +2188,9 @@ 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;
@ -2760,6 +2763,10 @@ 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))

21
drivers/usb/core/phy.c
View File

@ -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;

1
drivers/usb/core/phy.h
View File

@ -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);