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path: root/drivers/usb/gadget
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-rw-r--r--drivers/usb/gadget/at91_udc.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index df1bae9b048..eaa79c8a9b8 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -366,6 +366,13 @@ rescan:
if (is_done)
done(ep, req, 0);
else if (ep->is_pingpong) {
+ /*
+ * One dummy read to delay the code because of a HW glitch:
+ * CSR returns bad RXCOUNT when read too soon after updating
+ * RX_DATA_BK flags.
+ */
+ csr = __raw_readl(creg);
+
bufferspace -= count;
buf += count;
goto rescan;