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path: root/drivers/usb/musb/musb_gadget.c
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Diffstat (limited to 'drivers/usb/musb/musb_gadget.c')
-rw-r--r--drivers/usb/musb/musb_gadget.c33
1 files changed, 22 insertions, 11 deletions
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index c7ebd0867fcc..f79440cdfe7e 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -165,9 +165,15 @@ static void nuke(struct musb_ep *ep, const int status)
if (is_dma_capable() && ep->dma) {
struct dma_controller *c = ep->musb->dma_controller;
int value;
+
if (ep->is_in) {
+ /*
+ * The programming guide says that we must not clear
+ * the DMAMODE bit before DMAENAB, so we only
+ * clear it in the second write...
+ */
musb_writew(epio, MUSB_TXCSR,
- 0 | MUSB_TXCSR_FLUSHFIFO);
+ MUSB_TXCSR_DMAMODE | MUSB_TXCSR_FLUSHFIFO);
musb_writew(epio, MUSB_TXCSR,
0 | MUSB_TXCSR_FLUSHFIFO);
} else {
@@ -230,7 +236,7 @@ static inline int max_ep_writesize(struct musb *musb, struct musb_ep *ep)
| IN token(s) are recd from Host.
| -> DMA interrupt on completion
| calls TxAvail.
- | -> stop DMA, ~DmaEenab,
+ | -> stop DMA, ~DMAENAB,
| -> set TxPktRdy for last short pkt or zlp
| -> Complete Request
| -> Continue next request (call txstate)
@@ -315,9 +321,17 @@ static void txstate(struct musb *musb, struct musb_request *req)
request->dma, request_size);
if (use_dma) {
if (musb_ep->dma->desired_mode == 0) {
- /* ASSERT: DMAENAB is clear */
- csr &= ~(MUSB_TXCSR_AUTOSET |
- MUSB_TXCSR_DMAMODE);
+ /*
+ * We must not clear the DMAMODE bit
+ * before the DMAENAB bit -- and the
+ * latter doesn't always get cleared
+ * before we get here...
+ */
+ csr &= ~(MUSB_TXCSR_AUTOSET
+ | MUSB_TXCSR_DMAENAB);
+ musb_writew(epio, MUSB_TXCSR, csr
+ | MUSB_TXCSR_P_WZC_BITS);
+ csr &= ~MUSB_TXCSR_DMAMODE;
csr |= (MUSB_TXCSR_DMAENAB |
MUSB_TXCSR_MODE);
/* against programming guide */
@@ -334,10 +348,7 @@ static void txstate(struct musb *musb, struct musb_request *req)
#elif defined(CONFIG_USB_TI_CPPI_DMA)
/* program endpoint CSR first, then setup DMA */
- csr &= ~(MUSB_TXCSR_AUTOSET
- | MUSB_TXCSR_DMAMODE
- | MUSB_TXCSR_P_UNDERRUN
- | MUSB_TXCSR_TXPKTRDY);
+ csr &= ~(MUSB_TXCSR_P_UNDERRUN | MUSB_TXCSR_TXPKTRDY);
csr |= MUSB_TXCSR_MODE | MUSB_TXCSR_DMAENAB;
musb_writew(epio, MUSB_TXCSR,
(MUSB_TXCSR_P_WZC_BITS & ~MUSB_TXCSR_P_UNDERRUN)
@@ -364,8 +375,8 @@ static void txstate(struct musb *musb, struct musb_request *req)
if (!use_dma) {
c->channel_release(musb_ep->dma);
musb_ep->dma = NULL;
- /* ASSERT: DMAENAB clear */
- csr &= ~(MUSB_TXCSR_DMAMODE | MUSB_TXCSR_MODE);
+ csr &= ~MUSB_TXCSR_DMAENAB;
+ musb_writew(epio, MUSB_TXCSR, csr);
/* invariant: prequest->buf is non-null */
}
#elif defined(CONFIG_USB_TUSB_OMAP_DMA)