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USB: musb_udc: Make musb_peri_rx_ep check for MUSB_RXCSR_RXPKTRDY

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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@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>
This commit is contained in:
Pankaj Bharadiya 2012-09-13 09:38:16 +00:00 committed by Tom Rini
parent 39826f0997
commit 3f0be8ea92
1 changed files with 10 additions and 1 deletions
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11
drivers/usb/musb/musb_udc.c
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@ -640,8 +640,17 @@ static void musb_peri_ep0(void)
static void musb_peri_rx_ep(unsigned int ep) 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) { if (peri_rxcount) {
struct usb_endpoint_instance *endpoint; struct usb_endpoint_instance *endpoint;
u32 length; u32 length;