[Qemu-devel] [PATCH] ehci: fix Interrupt Threshold Control implementation

[Gerd Hoffmann]

First, not all interrupts are subject to Interrupt Threshold Control,
some of them must be delivered without delay.

Second, Interrupt Threshold Control state must be part of vmstate,
otherwise we might loose IRQs on migration.

Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
 hw/usb/hcd-ehci.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 2eeef29..b78bf44 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -576,7 +576,12 @@ static inline void ehci_update_irq(EHCIState *s)
 /* flag interrupt condition */
 static inline void ehci_raise_irq(EHCIState *s, int intr)
 {
-    s->usbsts_pending |= intr;
+    if (intr & (USBSTS_PCD | USBSTS_FLR | USBSTS_HSE)) {
+        s->usbsts |= intr;
+        ehci_update_irq(s);
+    } else {
+        s->usbsts_pending |= intr;
+    }
 }
 
 /*
@@ -2480,7 +2485,8 @@ static int usb_ehci_post_load(void *opaque, int 
version_id)
 
 static const VMStateDescription vmstate_ehci = {
     .name        = "ehci",
-    .version_id  = 1,
+    .version_id  = 2,
+    .minimum_version_id  = 1,
     .pre_save    = usb_ehci_pre_save,
     .post_load   = usb_ehci_post_load,
     .fields      = (VMStateField[]) {
@@ -2488,6 +2494,8 @@ static const VMStateDescription vmstate_ehci = {
         /* mmio registers */
         VMSTATE_UINT32(usbcmd, EHCIState),
         VMSTATE_UINT32(usbsts, EHCIState),
+        VMSTATE_UINT32_V(usbsts_pending, EHCIState, 2),
+        VMSTATE_UINT32_V(usbsts_frindex, EHCIState, 2),
         VMSTATE_UINT32(usbintr, EHCIState),
         VMSTATE_UINT32(frindex, EHCIState),
         VMSTATE_UINT32(ctrldssegment, EHCIState),
-- 
1.7.1