[U-Boot] [PATCH v2] USB: musb_udc: Make musb_peri_rx_ep check for MUSB_RXCSR_RXPKTRDY
Tom Rini
trini at ti.com
Thu Sep 13 21:38:16 CEST 2012
From: Pankaj Bharadiya <pankaj.bharadiya at ti.com>
The endpoint rx count register value will be zero if it is read before
receive packet ready bit (PERI_RXCSR:RXPKTRDY) is set.
Check for the receive packet ready bit (PERI_RXCSR:RXPKTRDY) before
reading endpoint rx count register. Proceed with rx count read and
FIFO read only if RXPKTRDY bit is set.
Signed-off-by: Pankaj Bharadiya <pankaj.bharadiya at ti.com>
Signed-off-by: Tom Rini <trini at ti.com>
---
drivers/usb/musb/musb_udc.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/musb/musb_udc.c b/drivers/usb/musb/musb_udc.c
index 09cdec3..e0b4217 100644
--- a/drivers/usb/musb/musb_udc.c
+++ b/drivers/usb/musb/musb_udc.c
@@ -640,8 +640,17 @@ static void musb_peri_ep0(void)
static void musb_peri_rx_ep(unsigned int ep)
{
- u16 peri_rxcount = readw(&musbr->ep[ep].epN.rxcount);
+ u16 peri_rxcount;
+ u8 peri_rxcsr = readw(&musbr->ep[ep].epN.rxcsr);
+ if (!(peri_rxcsr & MUSB_RXCSR_RXPKTRDY)) {
+ if (debug_level > 0)
+ serial_printf("ERROR : %s %d without MUSB_RXCSR_RXPKTRDY set\n",
+ __PRETTY_FUNCTION__, ep);
+ return;
+ }
+
+ peri_rxcount = readw(&musbr->ep[ep].epN.rxcount);
if (peri_rxcount) {
struct usb_endpoint_instance *endpoint;
u32 length;
--
1.7.9.5
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