diff options
Diffstat (limited to 'drivers/usb/musb/musb_gadget.c')
| -rw-r--r-- | drivers/usb/musb/musb_gadget.c | 33 |
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) |
