[PATCH v5 3/3] media: stk1160: use usb_alloc_noncoherent/usb_free_noncoherent()

[Xu Yang <xu.yang_2@nxp.com>]

This will use USB noncoherent API to alloc/free urb buffers, then
stk1160 driver needn't to do dma sync operations by itself.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>

---
Changes in v5:
 - no changes
Changes in v4:
 - no changes
Changes in v3:
 - no changes
---
 drivers/media/usb/stk1160/stk1160-v4l.c   |  4 ---
 drivers/media/usb/stk1160/stk1160-video.c | 43 ++++++-----------------
 drivers/media/usb/stk1160/stk1160.h       |  7 ----
 3 files changed, 11 insertions(+), 43 deletions(-)

diff --git a/drivers/media/usb/stk1160/stk1160-v4l.c b/drivers/media/usb/stk1160/stk1160-v4l.c
index 5ba3d9c4b3fb..715ce1dcb304 100644
--- a/drivers/media/usb/stk1160/stk1160-v4l.c
+++ b/drivers/media/usb/stk1160/stk1160-v4l.c
@@ -232,10 +232,6 @@ static int stk1160_start_streaming(struct stk1160 *dev)
 
 	/* submit urbs and enables IRQ */
 	for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
-		struct stk1160_urb *stk_urb = &dev->isoc_ctl.urb_ctl[i];
-
-		dma_sync_sgtable_for_device(stk1160_get_dmadev(dev), stk_urb->sgt,
-					    DMA_FROM_DEVICE);
 		rc = usb_submit_urb(dev->isoc_ctl.urb_ctl[i].urb, GFP_KERNEL);
 		if (rc) {
 			stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
diff --git a/drivers/media/usb/stk1160/stk1160-video.c b/drivers/media/usb/stk1160/stk1160-video.c
index 9cbd957ecc90..416cb74377eb 100644
--- a/drivers/media/usb/stk1160/stk1160-video.c
+++ b/drivers/media/usb/stk1160/stk1160-video.c
@@ -298,9 +298,7 @@ static void stk1160_process_isoc(struct stk1160 *dev, struct urb *urb)
 static void stk1160_isoc_irq(struct urb *urb)
 {
 	int i, rc;
-	struct stk1160_urb *stk_urb = urb->context;
-	struct stk1160 *dev = stk_urb->dev;
-	struct device *dma_dev = stk1160_get_dmadev(dev);
+	struct stk1160 *dev = urb->context;
 
 	switch (urb->status) {
 	case 0:
@@ -315,10 +313,6 @@ static void stk1160_isoc_irq(struct urb *urb)
 		return;
 	}
 
-	invalidate_kernel_vmap_range(stk_urb->transfer_buffer,
-				     urb->transfer_buffer_length);
-	dma_sync_sgtable_for_cpu(dma_dev, stk_urb->sgt, DMA_FROM_DEVICE);
-
 	stk1160_process_isoc(dev, urb);
 
 	/* Reset urb buffers */
@@ -327,7 +321,6 @@ static void stk1160_isoc_irq(struct urb *urb)
 		urb->iso_frame_desc[i].actual_length = 0;
 	}
 
-	dma_sync_sgtable_for_device(dma_dev, stk_urb->sgt, DMA_FROM_DEVICE);
 	rc = usb_submit_urb(urb, GFP_ATOMIC);
 	if (rc)
 		stk1160_err("urb re-submit failed (%d)\n", rc);
@@ -365,11 +358,9 @@ void stk1160_cancel_isoc(struct stk1160 *dev)
 
 static void stk_free_urb(struct stk1160 *dev, struct stk1160_urb *stk_urb)
 {
-	struct device *dma_dev = stk1160_get_dmadev(dev);
-
-	dma_vunmap_noncontiguous(dma_dev, stk_urb->transfer_buffer);
-	dma_free_noncontiguous(dma_dev, stk_urb->urb->transfer_buffer_length,
-			       stk_urb->sgt, DMA_FROM_DEVICE);
+	usb_free_noncoherent(dev->udev, stk_urb->urb->transfer_buffer_length,
+			     stk_urb->transfer_buffer, DMA_FROM_DEVICE,
+			     stk_urb->sgt);
 	usb_free_urb(stk_urb->urb);
 
 	stk_urb->transfer_buffer = NULL;
@@ -410,32 +401,19 @@ void stk1160_uninit_isoc(struct stk1160 *dev)
 static int stk1160_fill_urb(struct stk1160 *dev, struct stk1160_urb *stk_urb,
 			    int sb_size, int max_packets)
 {
-	struct device *dma_dev = stk1160_get_dmadev(dev);
-
 	stk_urb->urb = usb_alloc_urb(max_packets, GFP_KERNEL);
 	if (!stk_urb->urb)
 		return -ENOMEM;
-	stk_urb->sgt = dma_alloc_noncontiguous(dma_dev, sb_size,
-					       DMA_FROM_DEVICE, GFP_KERNEL, 0);
-
-	/*
-	 * If the buffer allocation failed, we exit but return 0 since
-	 * we allow the driver working with less buffers
-	 */
-	if (!stk_urb->sgt)
-		goto free_urb;
 
-	stk_urb->transfer_buffer = dma_vmap_noncontiguous(dma_dev, sb_size,
-							  stk_urb->sgt);
+	stk_urb->transfer_buffer = usb_alloc_noncoherent(dev->udev, sb_size,
+							 GFP_KERNEL, &stk_urb->dma,
+							 DMA_FROM_DEVICE, &stk_urb->sgt);
 	if (!stk_urb->transfer_buffer)
-		goto free_sgt;
+		goto free_urb;
 
-	stk_urb->dma = stk_urb->sgt->sgl->dma_address;
 	stk_urb->dev = dev;
 	return 0;
-free_sgt:
-	dma_free_noncontiguous(dma_dev, sb_size, stk_urb->sgt, DMA_FROM_DEVICE);
-	stk_urb->sgt = NULL;
+
 free_urb:
 	usb_free_urb(stk_urb->urb);
 	stk_urb->urb = NULL;
@@ -494,12 +472,13 @@ int stk1160_alloc_isoc(struct stk1160 *dev)
 		urb->transfer_buffer = dev->isoc_ctl.urb_ctl[i].transfer_buffer;
 		urb->transfer_buffer_length = sb_size;
 		urb->complete = stk1160_isoc_irq;
-		urb->context = &dev->isoc_ctl.urb_ctl[i];
+		urb->context = dev;
 		urb->interval = 1;
 		urb->start_frame = 0;
 		urb->number_of_packets = max_packets;
 		urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
 		urb->transfer_dma = dev->isoc_ctl.urb_ctl[i].dma;
+		urb->sgt = dev->isoc_ctl.urb_ctl[i].sgt;
 
 		k = 0;
 		for (j = 0; j < max_packets; j++) {
diff --git a/drivers/media/usb/stk1160/stk1160.h b/drivers/media/usb/stk1160/stk1160.h
index 7b498d14ed7a..4cbcb0a03bab 100644
--- a/drivers/media/usb/stk1160/stk1160.h
+++ b/drivers/media/usb/stk1160/stk1160.h
@@ -16,8 +16,6 @@
 #include <media/videobuf2-v4l2.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-ctrls.h>
-#include <linux/usb.h>
-#include <linux/usb/hcd.h>
 
 #define STK1160_VERSION		"0.9.5"
 #define STK1160_VERSION_NUM	0x000905
@@ -195,8 +193,3 @@ void stk1160_select_input(struct stk1160 *dev);
 
 /* Provided by stk1160-ac97.c */
 void stk1160_ac97_setup(struct stk1160 *dev);
-
-static inline struct device *stk1160_get_dmadev(struct stk1160 *dev)
-{
-	return bus_to_hcd(dev->udev->bus)->self.sysdev;
-}
-- 
2.34.1