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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>
This commit is contained in:
Cliff Cai 2010-01-28 20:44:18 -05:00 committed by Greg Kroah-Hartman
parent 0ded2f146a
commit 9f445cb299
2 changed files with 23 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/usb/musb/musb_gadget.c
View File

@ -895,7 +895,14 @@ static int musb_gadget_enable(struct usb_ep *ep,
/* REVISIT if can_bulk_split(), use by updating "tmp";
* likewise high bandwidth periodic tx
*/
musb_writew(regs, MUSB_TXMAXP, tmp);
/* 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.
*/
if (musb->hwvers < MUSB_HWVERS_2000)
musb_writew(regs, MUSB_TXMAXP, hw_ep->max_packet_sz_tx);
else
musb_writew(regs, MUSB_TXMAXP, tmp);
csr = MUSB_TXCSR_MODE | MUSB_TXCSR_CLRDATATOG;
if (musb_readw(regs, MUSB_TXCSR)
@ -925,7 +932,13 @@ static int musb_gadget_enable(struct usb_ep *ep,
/* REVISIT if can_bulk_combine() use by updating "tmp"
* likewise high bandwidth periodic rx
*/
musb_writew(regs, MUSB_RXMAXP, tmp);
/* 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, tmp);
/* force shared fifo to OUT-only mode */
if (hw_ep->is_shared_fifo) {

10
drivers/usb/musb/musb_host.c
View File

@ -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;
}