From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Rini Date: Thu, 13 Sep 2012 12:38:16 -0700 Subject: [U-Boot] [PATCH v2] USB: musb_udc: Make musb_peri_rx_ep check for MUSB_RXCSR_RXPKTRDY Message-ID: <1347565096-8880-1-git-send-email-trini@ti.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de From: Pankaj Bharadiya 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 Signed-off-by: Tom Rini --- 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