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authorMarek Szyprowski <m.szyprowski@samsung.com>2019-08-29 08:30:27 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-09-03 16:54:55 +0300
commit34c7ed72f4f04e73901ca6ec2e1db6c040495935 (patch)
tree58bbc9540d05a5a23144196c1717bbb63ad6e0fb /drivers/usb
parentd7290cd04b4ede9cccc0cf1b72ee856fdf46cf8b (diff)
downloadlinux-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')
-rw-r--r--drivers/usb/core/hcd.c7
-rw-r--r--drivers/usb/core/phy.c21
-rw-r--r--drivers/usb/core/phy.h1
3 files changed, 29 insertions, 0 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 4ccfc8e59604..f225eaa98ff8 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -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))
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;
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);