diff options
Diffstat (limited to 'meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0009-usb-musb_host-fix-ep0-fifo-flushing.patch')
| -rw-r--r-- | meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0009-usb-musb_host-fix-ep0-fifo-flushing.patch | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0009-usb-musb_host-fix-ep0-fifo-flushing.patch b/meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0009-usb-musb_host-fix-ep0-fifo-flushing.patch new file mode 100644 index 0000000000..09fc0a17d0 --- /dev/null +++ b/meta/recipes-kernel/linux/linux-omap-2.6.29/musb/0009-usb-musb_host-fix-ep0-fifo-flushing.patch @@ -0,0 +1,93 @@ +From 48ce47b15bfd420982ee275c595a9139eb6fabf7 Mon Sep 17 00:00:00 2001 +From: David Brownell <dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org> +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 <dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org> +--- + drivers/usb/musb/musb_host.c | 38 +++++++++++++++++++++++++------------- + 1 files changed, 25 insertions(+), 13 deletions(-) + +diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c +index ff09595..a5d75aa 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. +@@ -693,11 +716,7 @@ static void musb_ep_program(struct musb *musb, u8 epnum, + musb_writew(epio, MUSB_TXCSR, csr); + 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 +1082,7 @@ 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); +@@ -1081,9 +1096,6 @@ 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); + + goto done; + } +-- +1.6.0.4 + |