From eddaa8394bbacd0d2d4ec3a45488c3ae8b28cbbf Mon Sep 17 00:00:00 2001
From: hathach <thachha@live.com>
Date: Sat, 23 Mar 2013 02:51:41 +0700
Subject: [PATCH] fix issue with Interrupt Async Advance - only acknowledge
 interrupt that we check

---
 tinyusb/host/ehci/ehci.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/tinyusb/host/ehci/ehci.c b/tinyusb/host/ehci/ehci.c
index 734251d7f..d2b96d869 100644
--- a/tinyusb/host/ehci/ehci.c
+++ b/tinyusb/host/ehci/ehci.c
@@ -273,7 +273,8 @@ void hcd_isr(uint8_t hostid)
   ehci_registers_t* const regs = get_operational_register(hostid);
 
   uint32_t int_status = regs->usb_sts & regs->usb_int_enable;
-
+  regs->usb_sts |= int_status; // Acknowledge handled interrupt
+  
   if (int_status == 0)
     return;
 
@@ -309,8 +310,6 @@ void hcd_isr(uint8_t hostid)
   {
     async_advance_isr( get_async_head(hostid) );
   }
-
-  regs->usb_sts |= regs->usb_sts; // Acknowledge interrupt & clear it
 }
 
 //--------------------------------------------------------------------+
@@ -455,6 +454,18 @@ static inline void list_insert(ehci_link_t *current, ehci_link_t *new, uint8_t n
   current->type = new_type;
 }
 
+//static inline void qtd_remove_1st_from_qhd(ehci_qhd_t *p_qhd) ATTR_ALWAYS_INLINE;
+//static inline void qtd_remove_1st_from_qhd(ehci_qhd_t *p_qhd)
+//{
+//  if (p_qhd->p_qtd_list_head == p_qhd->p_qtd_list_tail) // last TD --> make it NULL
+//  {
+//    p_qhd->p_qtd_list_head = p_qhd->p_qtd_list_tail = NULL;
+//  }else
+//  {
+//    p_qhd->p_qtd_list_head = (ehci_qtd_t*) align32(p_qhd->p_qtd_list_head->next.address);
+//  }
+//}
+
 static inline void insert_qtd_to_qhd(ehci_qhd_t *p_qhd, ehci_qtd_t *p_qtd_new) ATTR_ALWAYS_INLINE;
 static inline void insert_qtd_to_qhd(ehci_qhd_t *p_qhd, ehci_qtd_t *p_qtd_new)
 {