usb: musb: disable double buffering when it's broken

We know that blackfin doesn't support double
buffering feature as of today. So we add a
flag set by musb_platform_init() to forcefully
disable that feature.

Such flag is created and marked as deprecated
to force us to find a solution for the missing
double buffering support on blackfin.

Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index ed58c6c8f15c..23dad4c8785d 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -989,7 +989,11 @@ static int musb_gadget_enable(struct usb_ep *ep,
                 /* Set TXMAXP with the FIFO size of the endpoint
                  * to disable double buffering mode.
                  */
-                musb_writew(regs, MUSB_TXMAXP, musb_ep->packet_sz | (musb_ep->hb_mult << 11));
+                if (musb->double_buffer_not_ok)
+                        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));
 
                 csr = MUSB_TXCSR_MODE | MUSB_TXCSR_CLRDATATOG;
                 if (musb_readw(regs, MUSB_TXCSR)
@@ -1025,7 +1029,11 @@ static int musb_gadget_enable(struct usb_ep *ep,
                 /* Set RXMAXP with the FIFO size of the endpoint
                  * to disable double buffering mode.
                  */
-                musb_writew(regs, MUSB_RXMAXP, musb_ep->packet_sz | (musb_ep->hb_mult << 11));
+                if (musb->double_buffer_not_ok)
+                        musb_writew(regs, MUSB_RXMAXP, hw_ep->max_packet_sz_tx);
+                else
+                        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) {