Hello
I'm working on an Omap target:
CPU: ARM926EJ-S [41069263] revision 3 (ARMv5TEJ), cr=00053177
Machine: TI OMAP1710 HW20acq board
Memory policy: ECC disabled, Data cache writeback
OMAP1710 revision 8 handled as 16xx id: 8b5f702f03330200
I use the usb as cdc_acm and the communication in the both ways is very
stressed.
Some time the device receives a strange IRQ from EP0, which stop all
data reception from USB.
The usb registers during this IRQ are:
IRQ_SRC : 0xB0
EPN_STAT : 0x01
EP_NUM : 0x11
STAT_FLG : 0x00
The TI inc. documentation explains that the IRQ_SRC is TX and RX in the
same time. (the irq callback can manage only one). But EPN_STAT gives
only the EP number of the TX request.
In the same documentation we can read p15-67:
11:8 EPn_RX_IT_SRC The receive endpoint interrupt source (non-ISO) bit
only concerns non-ISO enpoints...
000: No receive endpoint interrupt is pending
I send you my patch. I hope that it will be usefull.
diff --git a/drivers/usb/gadget/omap_udc.c b/drivers/usb/gadget/omap_udc.c
index f81e4f0..863f692 100644
--- a/drivers/usb/gadget/omap_udc.c
+++ b/drivers/usb/gadget/omap_udc.c
@@ -1948,7 +1948,7 @@ static irqreturn_t omap_udc_pio_irq(int irq, void
*_dev)
u16 epn_stat, irq_src;
irqreturn_t status = IRQ_NONE;
struct omap_ep *ep;
- int epnum;
+ int epnum, epnumrx, epnumtx;
struct omap_udc *udc = _dev;
struct omap_req *req;
unsigned long flags;
@@ -1957,9 +1957,11 @@ static irqreturn_t omap_udc_pio_irq(int irq, void
*_dev)
epn_stat = omap_readw(UDC_EPN_STAT);
irq_src = omap_readw(UDC_IRQ_SRC);
+ epnumrx = (epn_stat >> 8) & 0x0f;
+ epnumtx = epn_stat & 0x0f;
/* handle OUT first, to avoid some wasteful NAKs */
- if (irq_src & UDC_EPN_RX) {
- epnum = (epn_stat >> 8) & 0x0f;
+ if ((irq_src & UDC_EPN_RX) && epnumrx) {
+ epnum = epnumrx;
omap_writew(UDC_EPN_RX, UDC_IRQ_SRC);
status = IRQ_HANDLED;
ep = &udc->ep[epnum];
@@ -1994,8 +1996,8 @@ static irqreturn_t omap_udc_pio_irq(int irq, void
*_dev)
}
/* then IN transfers */
- else if (irq_src & UDC_EPN_TX) {
- epnum = epn_stat & 0x0f;
+ else if ((irq_src & UDC_EPN_TX) && epnumtx){
+ epnum = epnumtx;
omap_writew(UDC_EPN_TX, UDC_IRQ_SRC);
status = IRQ_HANDLED;
ep = &udc->ep[16 + epnum];
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