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Commit f8afbf7f authored by T. S., Anil Kumar's avatar T. S., Anil Kumar Committed by Greg Kroah-Hartman
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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: default avatarAnil Shetty <anil@ti.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent ae9b2ad2

drivers/usb/musb/musb_host.c

+4 −2
Original line number Diff line number Diff line
@@ -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())