From: Arnaud Mandy <ext-arnaud.2.mandy@xxxxxxxxx>
It seems like the hardware is generating irq before setting RxPktRdy
in the RxCSR register, so let's wait a little bit until that
gets set.
Signed-off-by: Arnaud Mandy <ext-arnaud.2.mandy@xxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxx>
---
drivers/usb/musb/musb_gadget.c | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 2f09a9e..808a432 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -637,9 +637,21 @@ static void do_pio_rx(struct musb *musb, struct musb_request *req)
void __iomem *epio = musb->endpoints[epnum].regs;
unsigned fifo_count = 0;
u16 count = musb_ep->packet_sz;
+ int retries = 1000;
csr = musb_readw(epio, MUSB_RXCSR);
+ /* RxPktRdy should be the only possibility here.
+ * Sometimes the IRQ is generated before
+ * RxPktRdy gets set, so we'll wait a while. */
+ while (!(csr & MUSB_RXCSR_RXPKTRDY)) {
+ if (retries-- == 0) {
+ DBG(1, "RxPktRdy did not get set (CSR %04x)\n", csr);
+ BUG_ON(!(csr & MUSB_RXCSR_RXPKTRDY));
+ }
+ csr = musb_readw(epio, MUSB_RXCSR);
+ }
+
musb_ep->busy = 1;
count = musb_readw(epio, MUSB_RXCOUNT);
--
1.6.4.2.253.g0b1fac
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