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
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -1120,6 +1120,7 @@
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 @@
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 @@
if (!done) {
offset = qh->offset;
length = urb->transfer_buffer_length - offset;
+ transfer_pending = true;
}
}
}
@@ -1312,7 +1314,7 @@
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())