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| author | Cliff Cai <cliff.cai@analog.com> | 2010-01-28 20:44:18 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-03-02 14:54:48 -0800 |
| commit | 9f445cb29918dc488b7a9a92ef018599cce33df7 (patch) | |
| tree | 912365e85cc2b0f75dfc20a011c9d7e2db195362 /drivers/usb/musb/musb_host.c | |
| parent | 0ded2f146acfaf71e5f4c15b80cf89b3af48134c (diff) | |
| download | blackbird-op-linux-9f445cb29918dc488b7a9a92ef018599cce33df7.tar.gz blackbird-op-linux-9f445cb29918dc488b7a9a92ef018599cce33df7.zip | |
USB: musb: disable double buffering for older RTL versions
Trying to use double buffer modes in RTL versions <2.0 may result in
infinite hangs or data corruption. So avoid them with older versions.
Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/musb/musb_host.c')
| -rw-r--r-- | drivers/usb/musb/musb_host.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c index c3fdd6d69f5e..3421cf9858b5 100644 --- a/drivers/usb/musb/musb_host.c +++ b/drivers/usb/musb/musb_host.c @@ -605,8 +605,14 @@ musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep) musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg); musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg); /* NOTE: bulk combining rewrites high bits of maxpacket */ - musb_writew(ep->regs, MUSB_RXMAXP, - qh->maxpacket | ((qh->hb_mult - 1) << 11)); + /* Set RXMAXP with the FIFO size of the endpoint + * to disable double buffer mode. + */ + if (musb->hwvers < MUSB_HWVERS_2000) + musb_writew(ep->regs, MUSB_RXMAXP, ep->max_packet_sz_rx); + else + musb_writew(ep->regs, MUSB_RXMAXP, + qh->maxpacket | ((qh->hb_mult - 1) << 11)); ep->rx_reinit = 0; } |
