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LPC17 USB host: Fix some OHCI done head handling when a tranfer is cancelled

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This commit is contained in:
Gregory Nutt 2015-05-15 08:29:45 -06:00
parent 6591a36950
commit 87b065253d
3 changed files with 86 additions and 60 deletions
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40
arch/arm/src/lpc17xx/lpc17_usbhost.c
View File

@ -1786,19 +1786,38 @@ static int lpc17_usbinterrupt(int irq, void *context)
* cleared in the interrupt status register.
*/
td = (struct lpc17_gtd_s *)HCCA->donehead;
td = (struct lpc17_gtd_s *)(HCCA->donehead & HCCA_DONEHEAD_MASK);
HCCA->donehead = 0;
/* Process each TD in the write done list */
for (; td; td = next)
{
/* REVISIT: I have encountered bad TDs in the done list linked
* after at least one good TD. This is some consequence of how
* transfers are being cancelled. But for now, I have only
* this work-around.
*/
if ((uintptr_t)td < LPC17_TDFREE_BASE ||
(uintptr_t)td >= (LPC17_TDFREE_BASE + LPC17_TD_SIZE*CONFIG_USBHOST_NTDS))
{
break;
}
/* Get the ED in which this TD was enqueued */
ed = td->ed;
DEBUGASSERT(ed != NULL && ed->xfrinfo != NULL);
xfrinfo = ed->xfrinfo;
DEBUGASSERT(ed != NULL);
/* If there is a transfer in progress, then the xfrinfo pointer will be
* non-NULL. But it appears that a NULL pointer may be received with a
* spurious interrupt such as may occur after a transfer is cancelled.
*/
xfrinfo = ed->xfrinfo;
if (xfrinfo)
{
/* Save the condition code from the (single) TD status/control
* word.
*/
@ -1817,8 +1836,8 @@ static int lpc17_usbinterrupt(int irq, void *context)
#endif
/* Determine the number of bytes actually transfer by
* subtracting the buffer start address from the CBP. A value
* of zero means that all bytes were transferred.
* subtracting the buffer start address from the CBP. A
* value of zero means that all bytes were transferred.
*/
tmp = (uintptr_t)td->hw.cbp;
@ -1832,9 +1851,9 @@ static int lpc17_usbinterrupt(int irq, void *context)
{
DEBUGASSERT(tmp >= (uintptr_t)xfrinfo->buffer);
/* Determine the size of the transfer by subtracting the
* current buffer pointer (CBP) from the initial buffer
* pointer (on packet receipt only).
/* Determine the size of the transfer by subtracting
* the current buffer pointer (CBP) from the initial
* buffer pointer (on packet receipt only).
*/
tmp -= (uintptr_t)xfrinfo->buffer;
@ -1857,8 +1876,8 @@ static int lpc17_usbinterrupt(int irq, void *context)
}
#ifdef CONFIG_USBHOST_ASYNCH
/* Perform any pending callbacks for the case of asynchronous
* transfers.
/* Perform any pending callbacks for the case of
* asynchronous transfers.
*/
else if (xfrinfo->callback)
@ -1869,6 +1888,7 @@ static int lpc17_usbinterrupt(int irq, void *context)
#endif
}
}
}
#ifdef CONFIG_DEBUG_USB
if ((pending & LPC17_DEBUG_INTS) != 0)

2
arch/arm/src/sama5/sam_ohci.c
View File

@ -2113,7 +2113,7 @@ static void sam_wdh_bottomhalf(void)
/* Now read the done head. */
td = (struct sam_gtd_s *)sam_virtramaddr(g_hcca.donehead);
td = (struct sam_gtd_s *)sam_virtramaddr(g_hcca.donehead & HCCA_DONEHEAD_MASK);
g_hcca.donehead = 0;
/* Process each TD in the write done list */

6
include/nuttx/usb/ohci.h
View File

@ -367,11 +367,17 @@
/* HccaDoneHead: When the HC reaches the end of a frame and its deferred
* interrupt register is 0, it writes the current value of its HcDoneHead to
* this location and generates an interrupt.
*
* The LSB of HCCADoneHead may be set to 1 to indicate that an unmasked
* HcInterruptStatus was set when HccaDoneHead was written.
*/
#define HCCA_DONEHEAD_OFFSET (0x84)
#define HCCA_DONEHEAD_BSIZE (4)
#define HCCA_DONEHEAD_MASK 0xfffffffe
#define HCCA_DONEHEAD_INTSTA (1 << 0)
/* 0x88: 116 bytes reserved */
#define HCCA_RESERVED_OFFSET (0x88)