From 0e6cd6e6da3d0648204526e8ebd79047f48d009a Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Fri, 2 Mar 2012 00:36:50 +0100
Subject: [PATCH 136/140] usb-ehci: Remove dead isoch_pause code

I see no value in keeping this around, so lets delete it.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 hw/usb-ehci.c |   60 +++++++++++++++------------------------------------------
 1 file changed, 15 insertions(+), 45 deletions(-)

diff --git a/hw/usb-ehci.c b/hw/usb-ehci.c
index aa6fae5..72c3f2a 100644
--- a/hw/usb-ehci.c
+++ b/hw/usb-ehci.c
@@ -419,7 +419,6 @@ struct EHCIState {
 
     USBPacket ipacket;
     QEMUSGList isgl;
-    int isoch_pause;
 
     uint64_t last_run_ns;
 };
@@ -886,7 +885,6 @@ static void ehci_reset(void *opaque)
 
     s->astate = EST_INACTIVE;
     s->pstate = EST_INACTIVE;
-    s->isoch_pause = -1;
     s->attach_poll_counter = 0;
 
     for(i = 0; i < NB_PORTS; i++) {
@@ -1468,46 +1466,7 @@ static int ehci_process_itd(EHCIState *ehci,
             usb_packet_unmap(&ehci->ipacket);
             qemu_sglist_destroy(&ehci->isgl);
 
-#if 0
-            /*  In isoch, there is no facility to indicate a NAK so let's
-             *  instead just complete a zero-byte transaction.  Setting
-             *  DBERR seems too draconian.
-             */
-
-            if (ret == USB_RET_NAK) {
-                if (ehci->isoch_pause > 0) {
-                    DPRINTF("ISOCH: received a NAK but paused so returning\n");
-                    ehci->isoch_pause--;
-                    return 0;
-                } else if (ehci->isoch_pause == -1) {
-                    DPRINTF("ISOCH: recv NAK & isoch pause inactive, setting\n");
-                    // Pause frindex for up to 50 msec waiting for data from
-                    // remote
-                    ehci->isoch_pause = 50;
-                    return 0;
-                } else {
-                    DPRINTF("ISOCH: isoch pause timeout! return 0\n");
-                    ret = 0;
-                }
-            } else {
-                DPRINTF("ISOCH: received ACK, clearing pause\n");
-                ehci->isoch_pause = -1;
-            }
-#else
-            if (ret == USB_RET_NAK) {
-                ret = 0;
-            }
-#endif
-
-            if (ret >= 0) {
-                if (!dir) {
-                    /* OUT */
-                    set_field(&itd->transact[i], len - ret, ITD_XACT_LENGTH);
-                } else {
-                    /* IN */
-                    set_field(&itd->transact[i], ret, ITD_XACT_LENGTH);
-                }
-            } else {
+            if (ret < 0) {
                 switch (ret) {
                 default:
                     fprintf(stderr, "Unexpected iso usb result: %d\n", ret);
@@ -1523,6 +1482,19 @@ static int ehci_process_itd(EHCIState *ehci,
                     itd->transact[i] |= ITD_XACT_BABBLE;
                     ehci_record_interrupt(ehci, USBSTS_ERRINT);
                     break;
+                case USB_RET_NAK:
+                    /* no data for us, so do a zero-length transfer */
+                    ret = 0;
+                    break;
+                }
+            }
+            if (ret >= 0) {
+                if (!dir) {
+                    /* OUT */
+                    set_field(&itd->transact[i], len - ret, ITD_XACT_LENGTH);
+                } else {
+                    /* IN */
+                    set_field(&itd->transact[i], ret, ITD_XACT_LENGTH);
                 }
             }
             if (itd->transact[i] & ITD_XACT_IOC) {
@@ -2176,9 +2148,7 @@ static void ehci_frame_timer(void *opaque)
 
     for (i = 0; i < frames; i++) {
         if ( !(ehci->usbsts & USBSTS_HALT)) {
-            if (ehci->isoch_pause <= 0) {
-                ehci->frindex += 8;
-            }
+            ehci->frindex += 8;
 
             if (ehci->frindex > 0x00001fff) {
                 ehci->frindex = 0;
-- 
1.7.9.3