This integrates the PHY roothub wrapper into the core hcd
infrastructure. Multiple PHYs which are part of the roothub devicetree
node (which is a sub-node of the sysdev's node) are now managed
(= powered on/off when needed), by the new usb_phy_roothub code.
One example where this is required is the Amlogic GXL and GXM SoCs:
They are using a dwc3 USB controller with up to three ports enabled on
the internal roothub. Using only the top-level "phy" properties does not
work here since one can only specify one "usb2-phy" and one "usb3-phy",
while actually at least two "usb2-phy" have to be specified.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
Tested-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/core/hcd.c | 26 ++++++++++++++++++++++++++
include/linux/usb/hcd.h | 1 +
2 files changed, 27 insertions(+)
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 67aa3d039b9b..6ee97222cdad 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -50,6 +50,7 @@
#include <linux/usb/otg.h>
#include "usb.h"
+#include "phy.h"
/*-------------------------------------------------------------------------*/
@@ -2271,6 +2272,8 @@ int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
usb_set_device_state(rhdev, USB_STATE_SUSPENDED);
hcd->state = HC_STATE_SUSPENDED;
+ usb_phy_roothub_power_off(hcd->phy_roothub);
+
/* Did we race with a root-hub wakeup event? */
if (rhdev->do_remote_wakeup) {
char buffer[6];
@@ -2307,6 +2310,11 @@ int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "resume");
return 0;
}
+
+ status = usb_phy_roothub_power_on(hcd->phy_roothub);
+ if (status)
+ return status;
+
if (!hcd->driver->bus_resume)
return -ENOENT;
if (HCD_RH_RUNNING(hcd))
@@ -2344,6 +2352,7 @@ int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
}
} else {
hcd->state = old_state;
+ usb_phy_roothub_power_off(hcd->phy_roothub);
dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
"resume", status);
if (status != -ESHUTDOWN)
@@ -2780,6 +2789,16 @@ int usb_add_hcd(struct usb_hcd *hcd,
}
}
+ hcd->phy_roothub = usb_phy_roothub_init(hcd->self.sysdev);
+ if (IS_ERR(hcd->phy_roothub)) {
+ retval = PTR_ERR(hcd->phy_roothub);
+ goto err_phy_roothub_init;
+ }
+
+ retval = usb_phy_roothub_power_on(hcd->phy_roothub);
+ if (retval)
+ goto err_usb_phy_roothub_power_on;
+
dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
/* Keep old behaviour if authorized_default is not in [0, 1]. */
@@ -2944,6 +2963,10 @@ int usb_add_hcd(struct usb_hcd *hcd,
err_register_bus:
hcd_buffer_destroy(hcd);
err_create_buf:
+ usb_phy_roothub_power_off(hcd->phy_roothub);
+err_usb_phy_roothub_power_on:
+ usb_phy_roothub_exit(hcd->phy_roothub);
+err_phy_roothub_init:
if (IS_ENABLED(CONFIG_GENERIC_PHY) && hcd->remove_phy && hcd->phy) {
phy_power_off(hcd->phy);
phy_exit(hcd->phy);
@@ -3028,6 +3051,9 @@ void usb_remove_hcd(struct usb_hcd *hcd)
usb_deregister_bus(&hcd->self);
hcd_buffer_destroy(hcd);
+ usb_phy_roothub_power_off(hcd->phy_roothub);
+ usb_phy_roothub_exit(hcd->phy_roothub);
+
if (IS_ENABLED(CONFIG_GENERIC_PHY) && hcd->remove_phy && hcd->phy) {
phy_power_off(hcd->phy);
phy_exit(hcd->phy);
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index a1f03ebfde47..6915b2afc209 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -103,6 +103,7 @@ struct usb_hcd {
*/
struct usb_phy *usb_phy;
struct phy *phy;
+ struct usb_phy_roothub *phy_roothub;
/* Flags that need to be manipulated atomically because they can
* change while the host controller is running. Always use
--
2.14.2
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