usb: dwc2: host: Get aligned DMA in a more supported way

All other host controllers who want aligned buffers for DMA do it a
certain way.  Let's do that too instead of working behind the USB core's
back.  This makes our interrupt handler not take forever and also rips
out a lot of code, simplifying things a bunch.

This also has the side effect of removing the 65535 max transfer size
limit.

NOTE: The actual code to allocate the aligned buffers is ripped almost
completely from the tegra EHCI driver.  At some point in the future we
may want to add this functionality to the USB core to share more code
everywhere.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: John Youn <johnyoun@synopsys.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: John Youn <johnyoun@synopsys.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

1 files changed, 0 insertions, 65 deletions

diff --git a/drivers/usb/dwc2/hcd_intr.c b/drivers/usb/dwc2/hcd_intr.c
index cadba8b13c48..4270f6c719c6 100644
--- a/drivers/usb/dwc2/hcd_intr.c
+++ b/drivers/usb/dwc2/hcd_intr.c
@@ -472,18 +472,6 @@ static int dwc2_update_urb_state(struct dwc2_hsotg *hsotg,
 		xfer_length = urb->length - urb->actual_length;
 	}
 
-	/* Non DWORD-aligned buffer case handling */
-	if (chan->align_buf && xfer_length) {
-		dev_vdbg(hsotg->dev, "%s(): non-aligned buffer\n", __func__);
-		dma_unmap_single(hsotg->dev, chan->qh->dw_align_buf_dma,
-				chan->qh->dw_align_buf_size,
-				chan->ep_is_in ?
-				DMA_FROM_DEVICE : DMA_TO_DEVICE);
-		if (chan->ep_is_in)
-			memcpy(urb->buf + urb->actual_length,
-					chan->qh->dw_align_buf, xfer_length);
-	}
-
 	dev_vdbg(hsotg->dev, "urb->actual_length=%d xfer_length=%d\n",
 		 urb->actual_length, xfer_length);
 	urb->actual_length += xfer_length;
@@ -573,21 +561,6 @@ static enum dwc2_halt_status dwc2_update_isoc_urb_state(
 		frame_desc->status = 0;
 		frame_desc->actual_length = dwc2_get_actual_xfer_length(hsotg,
 					chan, chnum, qtd, halt_status, NULL);
-
-		/* Non DWORD-aligned buffer case handling */
-		if (chan->align_buf && frame_desc->actual_length) {
-			dev_vdbg(hsotg->dev, "%s(): non-aligned buffer\n",
-				 __func__);
-			dma_unmap_single(hsotg->dev, chan->qh->dw_align_buf_dma,
-					chan->qh->dw_align_buf_size,
-					chan->ep_is_in ?
-					DMA_FROM_DEVICE : DMA_TO_DEVICE);
-			if (chan->ep_is_in)
-				memcpy(urb->buf + frame_desc->offset +
-					qtd->isoc_split_offset,
-					chan->qh->dw_align_buf,
-					frame_desc->actual_length);
-		}
 		break;
 	case DWC2_HC_XFER_FRAME_OVERRUN:
 		urb->error_count++;
@@ -608,21 +581,6 @@ static enum dwc2_halt_status dwc2_update_isoc_urb_state(
 		frame_desc->actual_length = dwc2_get_actual_xfer_length(hsotg,
 					chan, chnum, qtd, halt_status, NULL);
 
-		/* Non DWORD-aligned buffer case handling */
-		if (chan->align_buf && frame_desc->actual_length) {
-			dev_vdbg(hsotg->dev, "%s(): non-aligned buffer\n",
-				 __func__);
-			dma_unmap_single(hsotg->dev, chan->qh->dw_align_buf_dma,
-					chan->qh->dw_align_buf_size,
-					chan->ep_is_in ?
-					DMA_FROM_DEVICE : DMA_TO_DEVICE);
-			if (chan->ep_is_in)
-				memcpy(urb->buf + frame_desc->offset +
-					qtd->isoc_split_offset,
-					chan->qh->dw_align_buf,
-					frame_desc->actual_length);
-		}
-
 		/* Skip whole frame */
 		if (chan->qh->do_split &&
 		    chan->ep_type == USB_ENDPOINT_XFER_ISOC && chan->ep_is_in &&
@@ -688,8 +646,6 @@ static void dwc2_deactivate_qh(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
 	}
 
 no_qtd:
-	if (qh->channel)
-		qh->channel->align_buf = 0;
 	qh->channel = NULL;
 	dwc2_hcd_qh_deactivate(hsotg, qh, continue_split);
 }
@@ -954,14 +910,6 @@ static int dwc2_xfercomp_isoc_split_in(struct dwc2_hsotg *hsotg,
 
 	frame_desc->actual_length += len;
 
-	if (chan->align_buf) {
-		dev_vdbg(hsotg->dev, "%s(): non-aligned buffer\n", __func__);
-		dma_unmap_single(hsotg->dev, chan->qh->dw_align_buf_dma,
-				chan->qh->dw_align_buf_size, DMA_FROM_DEVICE);
-		memcpy(qtd->urb->buf + frame_desc->offset +
-		       qtd->isoc_split_offset, chan->qh->dw_align_buf, len);
-	}
-
 	qtd->isoc_split_offset += len;
 
 	if (frame_desc->actual_length >= frame_desc->length) {
@@ -1184,19 +1132,6 @@ static void dwc2_update_urb_state_abn(struct dwc2_hsotg *hsotg,
 		xfer_length = urb->length - urb->actual_length;
 	}
 
-	/* Non DWORD-aligned buffer case handling */
-	if (chan->align_buf && xfer_length && chan->ep_is_in) {
-		dev_vdbg(hsotg->dev, "%s(): non-aligned buffer\n", __func__);
-		dma_unmap_single(hsotg->dev, chan->qh->dw_align_buf_dma,
-				chan->qh->dw_align_buf_size,
-				chan->ep_is_in ?
-				DMA_FROM_DEVICE : DMA_TO_DEVICE);
-		if (chan->ep_is_in)
-			memcpy(urb->buf + urb->actual_length,
-					chan->qh->dw_align_buf,
-					xfer_length);
-	}
-
 	urb->actual_length += xfer_length;
 
 	hctsiz = dwc2_readl(hsotg->regs + HCTSIZ(chnum));