When the port goes to suspend or finishes resme, it needs to
notify PHY, it is not a standard EHCI operation, so we add a
quirk for it.
Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
---
drivers/usb/chipidea/host.c | 129 ++++++++++++++++++++++++++++++++++++++++++
include/linux/usb/chipidea.h | 1 +
2 files changed, 130 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
index 283b385..c1d05c4 100644
--- a/drivers/usb/chipidea/host.c
+++ b/drivers/usb/chipidea/host.c
@@ -34,6 +34,10 @@
static struct hc_driver __read_mostly ci_ehci_hc_driver;
static int (*orig_bus_suspend)(struct usb_hcd *hcd);
+static int (*orig_bus_resume)(struct usb_hcd *hcd);
+static int (*orig_hub_control)(struct usb_hcd *hcd,
+ u16 typeReq, u16 wValue, u16 wIndex,
+ char *buf, u16 wLength);
static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
{
@@ -75,12 +79,131 @@ static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
*/
udelay(125);
}
+ if (hcd->phy && test_bit(port, &ehci->bus_suspended)
+ && (ehci_port_speed(ehci, portsc) ==
+ USB_PORT_STAT_HIGH_SPEED))
+ /*
+ * notify the USB PHY, it is for global
+ * suspend case.
+ */
+ usb_phy_notify_suspend(hcd->phy,
+ USB_SPEED_HIGH);
}
}
return 0;
}
+static int ci_imx_ehci_bus_resume(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ int port;
+
+ int ret = orig_bus_resume(hcd);
+
+ if (ret)
+ return ret;
+
+ port = HCS_N_PORTS(ehci->hcs_params);
+ while (port--) {
+ u32 __iomem *reg = &ehci->regs->port_status[port];
+ u32 portsc = ehci_readl(ehci, reg);
+ /*
+ * Notify PHY after resume signal has finished, it is
+ * for global suspend case.
+ */
+ if (hcd->phy
+ && test_bit(port, &ehci->bus_suspended)
+ && (portsc & PORT_CONNECT)
+ && (ehci_port_speed(ehci, portsc) ==
+ USB_PORT_STAT_HIGH_SPEED))
+ /* notify the USB PHY */
+ usb_phy_notify_resume(hcd->phy, USB_SPEED_HIGH);
+ }
+
+ return 0;
+}
+
+/* The below code is based on tegra ehci driver */
+static int ci_imx_ehci_hub_control(
+ struct usb_hcd *hcd,
+ u16 typeReq,
+ u16 wValue,
+ u16 wIndex,
+ char *buf,
+ u16 wLength
+)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ u32 __iomem *status_reg;
+ u32 temp;
+ unsigned long flags;
+ int retval = 0;
+
+ status_reg = &ehci->regs->port_status[(wIndex & 0xff) - 1];
+
+ spin_lock_irqsave(&ehci->lock, flags);
+
+ if (typeReq == SetPortFeature && wValue == USB_PORT_FEAT_SUSPEND) {
+ temp = ehci_readl(ehci, status_reg);
+ if ((temp & PORT_PE) == 0 || (temp & PORT_RESET) != 0) {
+ retval = -EPIPE;
+ goto done;
+ }
+
+ temp &= ~(PORT_RWC_BITS | PORT_WKCONN_E);
+ temp |= PORT_WKDISC_E | PORT_WKOC_E;
+ ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
+
+ /*
+ * If a transaction is in progress, there may be a delay in
+ * suspending the port. Poll until the port is suspended.
+ */
+ if (ehci_handshake(ehci, status_reg, PORT_SUSPEND,
+ PORT_SUSPEND, 5000))
+ ehci_err(ehci, "timeout waiting for SUSPEND\n");
+
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ if (ehci_port_speed(ehci, temp) ==
+ USB_PORT_STAT_HIGH_SPEED && hcd->phy) {
+ /* notify the USB PHY */
+ usb_phy_notify_suspend(hcd->phy, USB_SPEED_HIGH);
+ }
+ spin_lock_irqsave(&ehci->lock, flags);
+
+ set_bit((wIndex & 0xff) - 1, &ehci->suspended_ports);
+ goto done;
+ }
+
+ /*
+ * After resume has finished, it needs do some post resume
+ * operation for some SoCs.
+ */
+ else if (typeReq == ClearPortFeature &&
+ wValue == USB_PORT_FEAT_C_SUSPEND) {
+
+ /* Make sure the resume has finished, it should be finished */
+ if (ehci_handshake(ehci, status_reg, PORT_RESUME, 0, 25000))
+ ehci_err(ehci, "timeout waiting for resume\n");
+
+ temp = ehci_readl(ehci, status_reg);
+
+ if (ehci_port_speed(ehci, temp) ==
+ USB_PORT_STAT_HIGH_SPEED && hcd->phy) {
+ /* notify the USB PHY */
+ usb_phy_notify_resume(hcd->phy, USB_SPEED_HIGH);
+ }
+ }
+
+ spin_unlock_irqrestore(&ehci->lock, flags);
+
+ /* Handle the hub control events here */
+ return orig_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
+done:
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ return retval;
+}
+
static irqreturn_t host_irq(struct ci_hdrc *ci)
{
return usb_hcd_irq(ci->irq, ci->hcd);
@@ -182,8 +305,14 @@ int ci_hdrc_host_init(struct ci_hdrc *ci)
ehci_init_driver(&ci_ehci_hc_driver, NULL);
orig_bus_suspend = ci_ehci_hc_driver.bus_suspend;
+ orig_bus_resume = ci_ehci_hc_driver.bus_resume;
+ orig_hub_control = ci_ehci_hc_driver.hub_control;
ci_ehci_hc_driver.bus_suspend = ci_ehci_bus_suspend;
+ if (ci->platdata->flags & CI_HDRC_IMX_EHCI_QUIRK) {
+ ci_ehci_hc_driver.bus_resume = ci_imx_ehci_bus_resume;
+ ci_ehci_hc_driver.hub_control = ci_imx_ehci_hub_control;
+ }
return 0;
}
diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index 667b46c..8ce3daf 100644
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -25,6 +25,7 @@ struct ci_hdrc_platform_data {
* but otg is not supported (no register otgsc).
*/
#define CI_HDRC_DUAL_ROLE_NOT_OTG BIT(4)
+#define CI_HDRC_IMX_EHCI_QUIRK BIT(5)
enum usb_dr_mode dr_mode;
#define CI_HDRC_CONTROLLER_RESET_EVENT 0
#define CI_HDRC_CONTROLLER_STOPPED_EVENT 1
--
1.7.1
--
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