usb: musb: set TXMAXP and AUTOSET for full speed bulk in device mode

The TXMAXP register is not set correctly for full speed bulk case
when the can_bulk_split() is used. Without this PIO transfers will
not take place correctly

The "mult" factor needs to be updated correctly for the
can_bulk_split() case

The AUTOSET bit in the TXCSR is not being set if the "mult"
factor is greater than 0 for the High Bandwidth ISO case.
But the "mult" factor is also greater than 0 in case of Full speed
bulk transfers with the packet splitting in TXMAXP register

Without the AUTOSET the DMA transfers will not progress in mode1

[ balbi@ti.com : add braces to both branches ]

Signed-off-by: supriya karanth <supriya.karanth@stericsson.com>
Signed-off-by: Praveena NADAHALLY <praveen.nadahally@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 19 insertions, 3 deletions

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 876787438c2f..be18537c5f14 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -408,7 +408,19 @@ static void txstate(struct musb *musb, struct musb_request *req)
                                         csr |= (MUSB_TXCSR_DMAENAB
                                                         | MUSB_TXCSR_DMAMODE
                                                         | MUSB_TXCSR_MODE);
-                                        if (!musb_ep->hb_mult)
+                                        /*
+                                         * Enable Autoset according to table
+                                         * below
+                                         * bulk_split hb_mult   Autoset_Enable
+                                         *      0       0       Yes(Normal)
+                                         *      0       >0      No(High BW ISO)
+                                         *      1       0       Yes(HS bulk)
+                                         *      1       >0      Yes(FS bulk)
+                                         */
+                                        if (!musb_ep->hb_mult ||
+                                                (musb_ep->hb_mult &&
+                                                 can_bulk_split(musb,
+                                                    musb_ep->type)))
                                                 csr |= MUSB_TXCSR_AUTOSET;
                                 }
                                 csr &= ~MUSB_TXCSR_P_UNDERRUN;
@@ -1110,11 +1122,15 @@ static int musb_gadget_enable(struct usb_ep *ep,
                 /* Set TXMAXP with the FIFO size of the endpoint
                  * to disable double buffering mode.
                  */
-                if (musb->double_buffer_not_ok)
+                if (musb->double_buffer_not_ok) {
                         musb_writew(regs, MUSB_TXMAXP, hw_ep->max_packet_sz_tx);
-                else
+                } else {
+                        if (can_bulk_split(musb, musb_ep->type))
+                                musb_ep->hb_mult = (hw_ep->max_packet_sz_tx /
+                                                        musb_ep->packet_sz) - 1;
                         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)