From: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
The current EHCI implementation is prepared to toggle the
PORT_POWER bit to enable or disable a USB-Port. In some
cases this port power can not be just toggled by the PORT_POWER
bit, and the gpio-regulator is needed to be toggled too.
This patch defines a port power control interface ehci_port_power for
ehci core use, it toggles PORT_POWER bit as well as calls platform
defined .port_power if it is defined.
Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
---
drivers/usb/host/ehci-hcd.c | 9 ++++++++-
drivers/usb/host/ehci-hub.c | 45 ++++++++++++++++++++++++++++++-------------
drivers/usb/host/ehci.h | 2 ++
include/linux/usb/hcd.h | 3 +++
4 files changed, 45 insertions(+), 14 deletions(-)
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 15feaf9..df75b8e 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -311,6 +311,7 @@ static void unlink_empty_async_suspended(struct ehci_hcd *ehci);
static void ehci_work(struct ehci_hcd *ehci);
static void start_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
static void end_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
+static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable);
#include "ehci-timer.c"
#include "ehci-hub.c"
@@ -329,9 +330,13 @@ static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
{
int port = HCS_N_PORTS(ehci->hcs_params);
- while (port--)
+ while (port--) {
ehci_writel(ehci, PORT_RWC_BITS,
&ehci->regs->port_status[port]);
+ spin_unlock_irq(&ehci->lock);
+ ehci_port_power(ehci, port, false);
+ spin_lock_irq(&ehci->lock);
+ }
}
/*
@@ -1233,6 +1238,8 @@ void ehci_init_driver(struct hc_driver *drv,
drv->hcd_priv_size += over->extra_priv_size;
if (over->reset)
drv->reset = over->reset;
+ if (over->port_power)
+ drv->port_power = over->port_power;
}
}
EXPORT_SYMBOL_GPL(ehci_init_driver);
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 5728829..118edb7 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -69,10 +69,8 @@ static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
if (test_bit(port, &ehci->owned_ports)) {
reg = &ehci->regs->port_status[port];
status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
- if (!(status & PORT_POWER)) {
- status |= PORT_POWER;
- ehci_writel(ehci, status, reg);
- }
+ if (!(status & PORT_POWER))
+ ehci_port_power(ehci, port, true);
}
}
@@ -952,9 +950,11 @@ int ehci_hub_control(
clear_bit(wIndex, &ehci->port_c_suspend);
break;
case USB_PORT_FEAT_POWER:
- if (HCS_PPC (ehci->hcs_params))
- ehci_writel(ehci, temp & ~PORT_POWER,
- status_reg);
+ if (HCS_PPC(ehci->hcs_params)) {
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ ehci_port_power(ehci, wIndex, false);
+ spin_lock_irqsave(&ehci->lock, flags);
+ }
break;
case USB_PORT_FEAT_C_CONNECTION:
ehci_writel(ehci, temp | PORT_CSC, status_reg);
@@ -1004,9 +1004,9 @@ int ehci_hub_control(
*/
if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
&& HCS_PPC(ehci->hcs_params)) {
- ehci_writel(ehci,
- temp & ~(PORT_RWC_BITS | PORT_POWER),
- status_reg);
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ ehci_port_power(ehci, wIndex, false);
+ spin_lock_irqsave(&ehci->lock, flags);
temp = ehci_readl(ehci, status_reg);
}
}
@@ -1187,9 +1187,11 @@ int ehci_hub_control(
set_bit(wIndex, &ehci->suspended_ports);
break;
case USB_PORT_FEAT_POWER:
- if (HCS_PPC (ehci->hcs_params))
- ehci_writel(ehci, temp | PORT_POWER,
- status_reg);
+ if (HCS_PPC(ehci->hcs_params)) {
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ ehci_port_power(ehci, wIndex, true);
+ spin_lock_irqsave(&ehci->lock, flags);
+ }
break;
case USB_PORT_FEAT_RESET:
if (temp & (PORT_SUSPEND|PORT_RESUME))
@@ -1297,3 +1299,20 @@ static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
reg = &ehci->regs->port_status[portnum - 1];
return ehci_readl(ehci, reg) & PORT_OWNER;
}
+
+static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
+{
+ struct usb_hcd *hcd = ehci_to_hcd(ehci);
+ u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
+ u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
+
+ if (enable)
+ ehci_writel(ehci, temp | PORT_POWER, status_reg);
+ else
+ ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
+
+ if (hcd->driver->port_power)
+ hcd->driver->port_power(hcd, portnum, enable);
+
+ return 0;
+}
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index eee228a..6f0577b 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -859,6 +859,8 @@ static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x)
struct ehci_driver_overrides {
size_t extra_priv_size;
int (*reset)(struct usb_hcd *hcd);
+ int (*port_power)(struct usb_hcd *hcd,
+ int portnum, bool enable);
};
extern void ehci_init_driver(struct hc_driver *drv,
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index cd96a2b..9cf7e35 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -379,6 +379,9 @@ struct hc_driver {
int (*disable_usb3_lpm_timeout)(struct usb_hcd *,
struct usb_device *, enum usb3_link_state state);
int (*find_raw_port_number)(struct usb_hcd *, int);
+ /* Call for power on/off the port if necessary */
+ int (*port_power)(struct usb_hcd *hcd, int portnum, bool enable);
+
};
static inline int hcd_giveback_urb_in_bh(struct usb_hcd *hcd)
--
1.7.9.5
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