From 31c9909b512aa4c97cffc40627c255070fe0bc78 Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Tue, 19 Oct 2010 19:08:25 -0500 Subject: [PATCH] USB: musb: gadget: fix MUSB_TXMAXP and MUSB_RXMAXP configuration Commit 9f445cb29918dc488b7a9a92ef018599cce33df7[USB: musb: disable double buffering for older RTL versions] tries to disable double buffer mode by writing endpoint hw max packet size to TXMAP/RXMAP. First the approach can break full speed and cause overflow problems. We should always set those registers with the actual max packet size from endpoint descriptor. Second, the problem describe by commit 9f445cb29918dc488b7a9a92ef018599cce33df7 was caused by musb gadget driver; nothing to do with RTL revision as originaly suspected. The real fix to the problem is to always use actual max packet size from endpoint descriptor to config TXMAP/RXMAP registers. Cc: Cliff Cai Cc: David Brownell Cc: Anand Gadiyar Cc: Mike Frysinger Cc: Sergei Shtylyov Cc: stable@kernel.org Signed-off-by: Ming Lei Signed-off-by: Felipe Balbi --- drivers/usb/musb/musb_gadget.c | 13 +++---------- 1 file changed, 3 insertions(+), 10 deletions(-) diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c index ba22e4a..f37b859 100644 --- a/drivers/usb/musb/musb_gadget.c +++ b/drivers/usb/musb/musb_gadget.c @@ -926,13 +926,9 @@ static int musb_gadget_enable(struct usb_ep *ep, * likewise high bandwidth periodic tx */ /* Set TXMAXP with the FIFO size of the endpoint - * to disable double buffering mode. Currently, It seems that double - * buffering has problem if musb RTL revision number < 2.0. + * to disable double buffering mode. */ - if (musb->hwvers < MUSB_HWVERS_2000) - musb_writew(regs, MUSB_TXMAXP, hw_ep->max_packet_sz_tx); - else - musb_writew(regs, MUSB_TXMAXP, musb_ep->packet_sz | (musb_ep->hb_mult << 11)); + musb_writew(regs, MUSB_TXMAXP, musb_ep->packet_sz | (musb_ep->hb_mult << 11)); csr = MUSB_TXCSR_MODE | MUSB_TXCSR_CLRDATATOG; if (musb_readw(regs, MUSB_TXCSR) @@ -968,10 +964,7 @@ static int musb_gadget_enable(struct usb_ep *ep, /* Set RXMAXP with the FIFO size of the endpoint * to disable double buffering mode. */ - if (musb->hwvers < MUSB_HWVERS_2000) - musb_writew(regs, MUSB_RXMAXP, hw_ep->max_packet_sz_rx); - else - musb_writew(regs, MUSB_RXMAXP, musb_ep->packet_sz | (musb_ep->hb_mult << 11)); + musb_writew(regs, MUSB_RXMAXP, musb_ep->packet_sz | (musb_ep->hb_mult << 11)); /* force shared fifo to OUT-only mode */ if (hw_ep->is_shared_fifo) { -- 2.7.4