On 05/23/2014 11:15 PM, Sergei Shtylyov wrote: > On 05/23/2014 04:57 PM, Daniel Mack wrote: >> I I'd say it's not supposed to. I just wanted the bit to be 0 when >> writing back the CSR. > > You failed to achieve that since you forgot ~; you're clearing all bits but > this one. Ouch, totally missed that, thanks! >>>> diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c >>>> index f98a7c0..9d3a5b2 100644 >>>> --- a/drivers/usb/musb/musb_host.c >>>> +++ b/drivers/usb/musb/musb_host.c >>>> @@ -120,7 +120,8 @@ static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep) >>>> if (csr != lastcsr) >>>> dev_dbg(musb->controller, "Host TX FIFONOTEMPTY csr: %02x\n", csr); >>>> lastcsr = csr; >>>> - csr |= MUSB_TXCSR_FLUSHFIFO; >>>> + csr &= MUSB_TXCSR_H_RXSTALL; >>>> + csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_CSR0_TXPKTRDY; > > Yes, the manual tells us to set TxPktRdy along with FlushFIFO. This has > been a long standing bug, perhaps because the old versions of the MUSBHDRC > manuals didn't mention that. Ok. I'll drop the RXSTALL thing from the patch. It's also unrelated the issue that I've seen, so let's not touch the bit here at all. >>>> musb_writew(epio, MUSB_TXCSR, csr); >>>> csr = musb_readw(epio, MUSB_TXCSR); > > Another possible bug here is not flushing the second FIFO in the > double-buffered mode... Hmm, ok. I'll not make that part of this patch though, I'd say. Would you like to follow up with a patch for that? Again, thanks for you review! Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
