From: Li Yang <leoli@xxxxxxxxxxxxx>
The original implementation of dequeuing a request in progress
is not correct. Change to use a correct process and also clean
up the related functions a little bit.
Signed-off-by: Li Yang <leoli@xxxxxxxxxxxxx>
Acked-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/usb/gadget/fsl_udc_core.c | 68 +++++++++++++++++-------------------
drivers/usb/gadget/fsl_usb2_udc.h | 10 +++++
2 files changed, 42 insertions(+), 36 deletions(-)
diff --git a/drivers/usb/gadget/fsl_udc_core.c b/drivers/usb/gadget/fsl_udc_core.c
index bf1cd6e..dd28ef3 100644
--- a/drivers/usb/gadget/fsl_udc_core.c
+++ b/drivers/usb/gadget/fsl_udc_core.c
@@ -696,12 +696,31 @@ static void fsl_free_request(struct usb_ep *_ep, struct usb_request *_req)
kfree(req);
}
-/*-------------------------------------------------------------------------*/
+/* Actually add a dTD chain to an empty dQH and let go */
+static void fsl_prime_ep(struct fsl_ep *ep, struct ep_td_struct *td)
+{
+ struct ep_queue_head *qh = get_qh_by_ep(ep);
+
+ /* Write dQH next pointer and terminate bit to 0 */
+ qh->next_dtd_ptr = cpu_to_hc32(td->td_dma
+ & EP_QUEUE_HEAD_NEXT_POINTER_MASK);
+
+ /* Clear active and halt bit */
+ qh->size_ioc_int_sts &= cpu_to_hc32(~(EP_QUEUE_HEAD_STATUS_ACTIVE
+ | EP_QUEUE_HEAD_STATUS_HALT));
+
+ /* Ensure that updates to the QH will occur before priming. */
+ wmb();
+
+ /* Prime endpoint by writing correct bit to ENDPTPRIME */
+ fsl_writel(ep_is_in(ep) ? (1 << (ep_index(ep) + 16))
+ : (1 << (ep_index(ep))), &dr_regs->endpointprime);
+}
+
+/* Add dTD chain to the dQH of an EP */
static void fsl_queue_td(struct fsl_ep *ep, struct fsl_req *req)
{
- int i = ep_index(ep) * 2 + ep_is_in(ep);
u32 temp, bitmask, tmp_stat;
- struct ep_queue_head *dQH = &ep->udc->ep_qh[i];
/* VDBG("QH addr Register 0x%8x", dr_regs->endpointlistaddr);
VDBG("ep_qh[%d] addr is 0x%8x", i, (u32)&(ep->udc->ep_qh[i])); */
@@ -719,7 +738,7 @@ static void fsl_queue_td(struct fsl_ep *ep, struct fsl_req *req)
cpu_to_hc32(req->head->td_dma & DTD_ADDR_MASK);
/* Read prime bit, if 1 goto done */
if (fsl_readl(&dr_regs->endpointprime) & bitmask)
- goto out;
+ return;
do {
/* Set ATDTW bit in USBCMD */
@@ -736,28 +755,10 @@ static void fsl_queue_td(struct fsl_ep *ep, struct fsl_req *req)
fsl_writel(temp & ~USB_CMD_ATDTW, &dr_regs->usbcmd);
if (tmp_stat)
- goto out;
+ return;
}
- /* Write dQH next pointer and terminate bit to 0 */
- temp = req->head->td_dma & EP_QUEUE_HEAD_NEXT_POINTER_MASK;
- dQH->next_dtd_ptr = cpu_to_hc32(temp);
-
- /* Clear active and halt bit */
- temp = cpu_to_hc32(~(EP_QUEUE_HEAD_STATUS_ACTIVE
- | EP_QUEUE_HEAD_STATUS_HALT));
- dQH->size_ioc_int_sts &= temp;
-
- /* Ensure that updates to the QH will occur before priming. */
- wmb();
-
- /* Prime endpoint by writing 1 to ENDPTPRIME */
- temp = ep_is_in(ep)
- ? (1 << (ep_index(ep) + 16))
- : (1 << (ep_index(ep)));
- fsl_writel(temp, &dr_regs->endpointprime);
-out:
- return;
+ fsl_prime_ep(ep, req->head);
}
/* Fill in the dTD structure
@@ -973,25 +974,20 @@ static int fsl_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
/* The request isn't the last request in this ep queue */
if (req->queue.next != &ep->queue) {
- struct ep_queue_head *qh;
struct fsl_req *next_req;
- qh = ep->qh;
next_req = list_entry(req->queue.next, struct fsl_req,
queue);
- /* Point the QH to the first TD of next request */
- fsl_writel((u32) next_req->head, &qh->curr_dtd_ptr);
+ /* prime with dTD of next request */
+ fsl_prime_ep(ep, next_req->head);
}
-
- /* The request hasn't been processed, patch up the TD chain */
+ /* The request hasn't been processed, patch up the TD chain */
} else {
struct fsl_req *prev_req;
prev_req = list_entry(req->queue.prev, struct fsl_req, queue);
- fsl_writel(fsl_readl(&req->tail->next_td_ptr),
- &prev_req->tail->next_td_ptr);
-
+ prev_req->tail->next_td_ptr = req->tail->next_td_ptr;
}
done(ep, req, -ECONNRESET);
@@ -1068,7 +1064,7 @@ static int fsl_ep_fifo_status(struct usb_ep *_ep)
struct fsl_udc *udc;
int size = 0;
u32 bitmask;
- struct ep_queue_head *d_qh;
+ struct ep_queue_head *qh;
ep = container_of(_ep, struct fsl_ep, ep);
if (!_ep || (!ep->desc && ep_index(ep) != 0))
@@ -1079,13 +1075,13 @@ static int fsl_ep_fifo_status(struct usb_ep *_ep)
if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN)
return -ESHUTDOWN;
- d_qh = &ep->udc->ep_qh[ep_index(ep) * 2 + ep_is_in(ep)];
+ qh = get_qh_by_ep(ep);
bitmask = (ep_is_in(ep)) ? (1 << (ep_index(ep) + 16)) :
(1 << (ep_index(ep)));
if (fsl_readl(&dr_regs->endptstatus) & bitmask)
- size = (d_qh->size_ioc_int_sts & DTD_PACKET_SIZE)
+ size = (qh->size_ioc_int_sts & DTD_PACKET_SIZE)
>> DTD_LENGTH_BIT_POS;
pr_debug("%s %u\n", __func__, size);
diff --git a/drivers/usb/gadget/fsl_usb2_udc.h b/drivers/usb/gadget/fsl_usb2_udc.h
index 1d51be8..f781f5d 100644
--- a/drivers/usb/gadget/fsl_usb2_udc.h
+++ b/drivers/usb/gadget/fsl_usb2_udc.h
@@ -569,6 +569,16 @@ static void dump_msg(const char *label, const u8 * buf, unsigned int length)
* 2 + ((windex & USB_DIR_IN) ? 1 : 0))
#define get_pipe_by_ep(EP) (ep_index(EP) * 2 + ep_is_in(EP))
+static inline struct ep_queue_head *get_qh_by_ep(struct fsl_ep *ep)
+{
+ /* we only have one ep0 structure but two queue heads */
+ if (ep_index(ep) != 0)
+ return ep->qh;
+ else
+ return &ep->udc->ep_qh[(ep->udc->ep0_dir ==
+ USB_DIR_IN) ? 1 : 0];
+}
+
struct platform_device;
#ifdef CONFIG_ARCH_MXC
int fsl_udc_clk_init(struct platform_device *pdev);
--
1.7.7.3
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
