[U-Boot] [PATCH 1/2] usb: ehci: Properly deal with data toggle for interrupt endpoints

[Hans de Goede]

Without this we loose every other interrupt packet. We never noticed this
because with keyboards the packets which we were loosing would normally
be key release packets.

But now that we do keyrepeat in software instead of relying on the hid
idle functionality, missing a release will result in key repeat triggering.

This commit fixes this.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 drivers/usb/host/ehci-hcd.c | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 1e5a6e2..bf02221 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1214,6 +1214,7 @@ static int _ehci_submit_control_msg(struct usb_device *dev, unsigned long pipe,
 
 struct int_queue {
 	int elementsize;
+	unsigned long pipe;
 	struct QH *first;
 	struct QH *current;
 	struct QH *last;
@@ -1269,7 +1270,7 @@ static struct int_queue *_ehci_create_int_queue(struct usb_device *dev,
 {
 	struct ehci_ctrl *ctrl = ehci_get_ctrl(dev);
 	struct int_queue *result = NULL;
-	int i;
+	uint32_t i, toggle;
 
 	/*
 	 * Interrupt transfers requiring several transactions are not supported
@@ -1309,6 +1310,7 @@ static struct int_queue *_ehci_create_int_queue(struct usb_device *dev,
 		goto fail1;
 	}
 	result->elementsize = elementsize;
+	result->pipe = pipe;
 	result->first = memalign(USB_DMA_MINALIGN,
 				 sizeof(struct QH) * queuesize);
 	if (!result->first) {
@@ -1326,6 +1328,8 @@ static struct int_queue *_ehci_create_int_queue(struct usb_device *dev,
 	memset(result->first, 0, sizeof(struct QH) * queuesize);
 	memset(result->tds, 0, sizeof(struct qTD) * queuesize);
 
+	toggle = usb_gettoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));
+
 	for (i = 0; i < queuesize; i++) {
 		struct QH *qh = result->first + i;
 		struct qTD *td = result->tds + i;
@@ -1357,7 +1361,9 @@ static struct int_queue *_ehci_create_int_queue(struct usb_device *dev,
 		td->qt_altnext = cpu_to_hc32(QT_NEXT_TERMINATE);
 		debug("communication direction is '%s'\n",
 		      usb_pipein(pipe) ? "in" : "out");
-		td->qt_token = cpu_to_hc32((elementsize << 16) |
+		td->qt_token = cpu_to_hc32(
+			QT_TOKEN_DT(toggle) |
+			(elementsize << 16) |
 			((usb_pipein(pipe) ? 1 : 0) << 8) | /* IN/OUT token */
 			0x80); /* active */
 		td->qt_buffer[0] =
@@ -1372,6 +1378,7 @@ static struct int_queue *_ehci_create_int_queue(struct usb_device *dev,
 		    cpu_to_hc32((td->qt_buffer[0] + 0x4000) & ~0xfff);
 
 		*buf = buffer + i * elementsize;
+		toggle ^= 1;
 	}
 
 	flush_dcache_range((unsigned long)buffer,
@@ -1426,6 +1433,8 @@ static void *_ehci_poll_int_queue(struct usb_device *dev,
 {
 	struct QH *cur = queue->current;
 	struct qTD *cur_td;
+	uint32_t token, toggle;
+	unsigned long pipe = queue->pipe;
 
 	/* depleted queue */
 	if (cur == NULL) {
@@ -1436,12 +1445,15 @@ static void *_ehci_poll_int_queue(struct usb_device *dev,
 	cur_td = &queue->tds[queue->current - queue->first];
 	invalidate_dcache_range((unsigned long)cur_td,
 				ALIGN_END_ADDR(struct qTD, cur_td, 1));
-	if (QT_TOKEN_GET_STATUS(hc32_to_cpu(cur_td->qt_token)) &
-			QT_TOKEN_STATUS_ACTIVE) {
-		debug("Exit poll_int_queue with no completed intr transfer. token is %x\n",
-		      hc32_to_cpu(cur_td->qt_token));
+	token = hc32_to_cpu(cur_td->qt_token);
+	if (QT_TOKEN_GET_STATUS(token) & QT_TOKEN_STATUS_ACTIVE) {
+		debug("Exit poll_int_queue with no completed intr transfer. token is %x\n", token);
 		return NULL;
 	}
+
+	toggle = QT_TOKEN_GET_DT(token);
+	usb_settoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe), toggle);
+
 	if (!(cur->qh_link & QH_LINK_TERMINATE))
 		queue->current++;
 	else
@@ -1452,7 +1464,7 @@ static void *_ehci_poll_int_queue(struct usb_device *dev,
 					       queue->elementsize));
 
 	debug("Exit poll_int_queue with completed intr transfer. token is %x at %p (first at %p)\n",
-	      hc32_to_cpu(cur_td->qt_token), cur, queue->first);
+	      token, cur, queue->first);
 	return cur->buffer;
 }
 
-- 
2.4.3