From 78322c1a64387673f46afb8b5e31edec94e9603d Mon Sep 17 00:00:00 2001 From: David Brownell Date: Thu, 26 Mar 2009 17:38:30 -0700 Subject: [PATCH] USB: musb_host, fix ep0 fifo flushing The MUSB host side can't share generic TX FIFO flush logic with EP0; the EP0 TX status register bits are different from those for other entpoints. Resolve this issue by providing a new EP0-specific routine to flush and reset the FIFO, which pays careful attention to restrictions listed in the latest programmer's guide. This gets rid of an open issue whereby the usbtest control write test (#14) failed. Signed-off-by: David Brownell Signed-off-by: Greg Kroah-Hartman --- drivers/usb/musb/musb_host.c | 43 ++++++++++++++++++++++++------------ 1 file changed, 29 insertions(+), 14 deletions(-) diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c index ff095956ca96..521fd83f5b9d 100644 --- a/drivers/usb/musb/musb_host.c +++ b/drivers/usb/musb/musb_host.c @@ -125,6 +125,29 @@ static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep) } } +static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep) +{ + void __iomem *epio = ep->regs; + u16 csr; + int retries = 5; + + /* scrub any data left in the fifo */ + do { + csr = musb_readw(epio, MUSB_TXCSR); + if (!(csr & (MUSB_CSR0_TXPKTRDY | MUSB_CSR0_RXPKTRDY))) + break; + musb_writew(epio, MUSB_TXCSR, MUSB_CSR0_FLUSHFIFO); + csr = musb_readw(epio, MUSB_TXCSR); + udelay(10); + } while (--retries); + + WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n", + ep->epnum, csr); + + /* and reset for the next transfer */ + musb_writew(epio, MUSB_TXCSR, 0); +} + /* * Start transmit. Caller is responsible for locking shared resources. * musb must be locked. @@ -694,10 +717,7 @@ static void musb_ep_program(struct musb *musb, u8 epnum, csr = musb_readw(epio, MUSB_TXCSR); } else { /* endpoint 0: just flush */ - musb_writew(epio, MUSB_CSR0, - csr | MUSB_CSR0_FLUSHFIFO); - musb_writew(epio, MUSB_CSR0, - csr | MUSB_CSR0_FLUSHFIFO); + musb_h_ep0_flush_fifo(hw_ep); } /* target addr and (for multipoint) hub addr/port */ @@ -1063,11 +1083,7 @@ irqreturn_t musb_h_ep0_irq(struct musb *musb) csr &= ~MUSB_CSR0_H_NAKTIMEOUT; musb_writew(epio, MUSB_CSR0, csr); } else { - csr |= MUSB_CSR0_FLUSHFIFO; - musb_writew(epio, MUSB_CSR0, csr); - musb_writew(epio, MUSB_CSR0, csr); - csr &= ~MUSB_CSR0_H_NAKTIMEOUT; - musb_writew(epio, MUSB_CSR0, csr); + musb_h_ep0_flush_fifo(hw_ep); } musb_writeb(epio, MUSB_NAKLIMIT0, 0); @@ -1081,10 +1097,7 @@ irqreturn_t musb_h_ep0_irq(struct musb *musb) * SHOULD NEVER HAPPEN! */ ERR("no URB for end 0\n"); - musb_writew(epio, MUSB_CSR0, MUSB_CSR0_FLUSHFIFO); - musb_writew(epio, MUSB_CSR0, MUSB_CSR0_FLUSHFIFO); - musb_writew(epio, MUSB_CSR0, 0); - + musb_h_ep0_flush_fifo(hw_ep); goto done; } @@ -2043,7 +2056,7 @@ static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh, int is_in) * endpoint's irq status here to avoid bogus irqs. * clearing that status is platform-specific... */ - } else { + } else if (ep->epnum) { musb_h_tx_flush_fifo(ep); csr = musb_readw(epio, MUSB_TXCSR); csr &= ~(MUSB_TXCSR_AUTOSET @@ -2057,6 +2070,8 @@ static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh, int is_in) musb_writew(epio, MUSB_TXCSR, csr); /* flush cpu writebuffer */ csr = musb_readw(epio, MUSB_TXCSR); + } else { + musb_h_ep0_flush_fifo(ep); } if (status == 0) musb_advance_schedule(ep->musb, urb, ep, is_in); -- 2.20.1