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USB: ci13xxx_udc: Skip flushing endpoints upon failure

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Flushing an endpoint involve polling ENDPTFLUSH and ENDPTSTAT
registers.  The worst case timeout is 100 msec for each endpoint.
The reason for failure is unknown.  When flushing an endpoint
fails, successive flushing of remaining endpoints are also failing.
Hence skip flushing remaining endpoints.  Reset this condition
upon USB bus reset.

(cherry picked from commit 2a630fb9b83b31e607ef61f3b61959cc1b095349)

CRs-Fixed: 445916
Change-Id: I54cf860c0d290ffa3fc0d7e41af32b4be48937ef
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
This commit is contained in:
Pavankumar Kondeti
2013-01-28 12:31:15 +05:30
committed by Iliyan Malchev
parent 837790d42e
commit 374c1baf93
2 changed files with 6 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/usb/gadget/ci13xxx_udc.c
View File

@@ -416,7 +416,7 @@ static int hw_ep_flush(int num, int dir)
int n = hw_ep_bit(num, dir);
struct ci13xxx_ep *mEp = &_udc->ci13xxx_ep[n];
if (list_empty(&mEp->qh.queue))
if (_udc->skip_flush || list_empty(&mEp->qh.queue))
return 0;
start = ktime_get();
@@ -432,6 +432,7 @@ static int hw_ep_flush(int num, int dir)
__func__, num,
dir ? "IN" : "OUT");
debug_ept_flush_info(num, dir);
_udc->skip_flush = true;
return 0;
}
}
@@ -2181,6 +2182,7 @@ __acquires(udc->lock)
if (retval)
goto done;
_udc->skip_flush = false;
retval = hw_usb_reset();
if (retval)
goto done;

3
drivers/usb/gadget/ci13xxx_udc.h
View File

@@ -160,6 +160,9 @@ struct ci13xxx {
int softconnect; /* is pull-up enable allowed */
unsigned long dTD_update_fail_count;
struct usb_phy *transceiver; /* Transceiver struct */
bool skip_flush; /* skip flushing remaining EP
upon flush timeout for the
first EP. */
};
struct ci13xxx_platform_data {