usb: musb: host: support DMA transfers greater than max channel length

Add support for MUSB Host DMA transfers greater than max
channel length, so that such transfers won't be truncated.

Signed-off-by: Anil Shetty <anil@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 62e39fc..4d5bcb4 100644 (file)
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -1120,6 +1120,7 @@ void musb_host_tx(struct musb *musb, u8 epnum)
        u32                     status = 0;
        void __iomem            *mbase = musb->mregs;
        struct dma_channel      *dma;
+       bool                    transfer_pending = false;
 
        musb_ep_select(mbase, epnum);
        tx_csr = musb_readw(epio, MUSB_TXCSR);
@@ -1280,7 +1281,7 @@ void musb_host_tx(struct musb *musb, u8 epnum)
                                offset = d->offset;
                                length = d->length;
                        }
-               } else if (dma) {
+               } else if (dma && urb->transfer_buffer_length == qh->offset) {
                        done = true;
                } else {
                        /* see if we need to send more data, or ZLP */
@@ -1293,6 +1294,7 @@ void musb_host_tx(struct musb *musb, u8 epnum)
                        if (!done) {
                                offset = qh->offset;
                                length = urb->transfer_buffer_length - offset;
+                               transfer_pending = true;
                        }
                }
        }
@@ -1312,7 +1314,7 @@ void musb_host_tx(struct musb *musb, u8 epnum)
                urb->actual_length = qh->offset;
                musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT);
                return;
-       } else  if (usb_pipeisoc(pipe) && dma) {
+       } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) {
                if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb,
                                offset, length)) {
                        if (is_cppi_enabled() || tusb_dma_omap())