diff options
| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2019-08-29 08:30:27 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-03 16:54:55 +0300 |
| commit | 34c7ed72f4f04e73901ca6ec2e1db6c040495935 (patch) | |
| tree | 58bbc9540d05a5a23144196c1717bbb63ad6e0fb /drivers/usb/core/phy.c | |
| parent | d7290cd04b4ede9cccc0cf1b72ee856fdf46cf8b (diff) | |
| download | linux-34c7ed72f4f04e73901ca6ec2e1db6c040495935.tar.xz | |
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 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.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>
Diffstat (limited to 'drivers/usb/core/phy.c')
| -rw-r--r-- | drivers/usb/core/phy.c | 21 |
1 files changed, 21 insertions, 0 deletions
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 @@ err_out: } 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; |