ehci: implement port wakeup

Update portsc register and raise irq in case a suspended
port is woken up, so remote wakeup works on our ehci ports.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

hw/usb/hcd-ehci.c

@@ -826,9 +826,9 @@ static void ehci_child_detach(USBPort *port, USBDevice *child)
 static void ehci_wakeup(USBPort *port)
 {
     EHCIState *s = port->opaque;
-    uint32_t portsc = s->portsc[port->index];
+    uint32_t *portsc = &s->portsc[port->index];
 
-    if (portsc & PORTSC_POWNER) {
+    if (*portsc & PORTSC_POWNER) {
         USBPort *companion = s->companion_ports[port->index];
         if (companion->ops->wakeup) {
             companion->ops->wakeup(companion);
@@ -836,6 +836,12 @@ static void ehci_wakeup(USBPort *port)
         return;
     }
 
+    if (*portsc & PORTSC_SUSPEND) {
+        trace_usb_ehci_port_wakeup(port->index);
+        *portsc |= PORTSC_FPRES;
+        ehci_raise_irq(s, USBSTS_PCD);
+    }
+
     qemu_bh_schedule(s->async_bh);
 }
 
@@ -1067,6 +1073,14 @@ static void ehci_port_write(void *ptr, hwaddr addr,
         }
     }
 
+    if ((val & PORTSC_SUSPEND) && !(*portsc & PORTSC_SUSPEND)) {
+        trace_usb_ehci_port_suspend(port);
+    }
+    if (!(val & PORTSC_FPRES) && (*portsc & PORTSC_FPRES)) {
+        trace_usb_ehci_port_resume(port);
+        val &= ~PORTSC_SUSPEND;
+    }
+
     *portsc &= ~PORTSC_RO_MASK;
     *portsc |= val;
     trace_usb_ehci_portsc_change(addr + s->portscbase, addr >> 2, *portsc, old);

trace-events

@@ -309,6 +309,9 @@ usb_ehci_sitd(uint32_t addr, uint32_t nxt, uint32_t active) "ITD @ %08x: next %0
 usb_ehci_port_attach(uint32_t port, const char *owner, const char *device) "attach port #%d, owner %s, device %s"
 usb_ehci_port_detach(uint32_t port, const char *owner) "detach port #%d, owner %s"
 usb_ehci_port_reset(uint32_t port, int enable) "reset port #%d - %d"
+usb_ehci_port_suspend(uint32_t port) "port #%d"
+usb_ehci_port_wakeup(uint32_t port) "port #%d"
+usb_ehci_port_resume(uint32_t port) "port #%d"
 usb_ehci_queue_action(void *q, const char *action) "q %p: %s"
 usb_ehci_packet_action(void *q, void *p, const char *action) "q %p p %p: %s"
 usb_ehci_irq(uint32_t level, uint32_t frindex, uint32_t sts, uint32_t mask) "level %d, frindex 0x%04x, sts 0x%x, mask 0x%x"