[PATCH v2 4/4] media: uvcvideo: eUSB2 double isochronous bandwidth support

[Sakari Ailus <sakari.ailus@linux.intel.com>]

From: Tao Q Tao <tao.q.tao@intel.com>

Use usb_endpoint_max_isoc_bpi() from the USB framework to find the maximum
bytes per interval for the endpoint. Consequently this adds eUSB2
isochronous mode and SuperSpeedPlus Isochronous Endpoint Compaion support
where larger bpi values are possible.

Co-developed-by: Amardeep Rai <amardeep.rai@intel.com>
Signed-off-by: Amardeep Rai <amardeep.rai@intel.com>
Signed-off-by: Tao Q Tao <tao.q.tao@intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Co-developed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
 drivers/media/usb/uvc/uvc_driver.c |  4 ++--
 drivers/media/usb/uvc/uvc_video.c  | 24 +++---------------------
 drivers/media/usb/uvc/uvcvideo.h   |  4 +---
 3 files changed, 6 insertions(+), 26 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index da24a655ab68..fde0bc95622c 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -536,7 +536,7 @@ static int uvc_parse_streaming(struct uvc_device *dev,
 	unsigned int nformats = 0, nframes = 0, nintervals = 0;
 	unsigned int size, i, n, p;
 	u32 *interval;
-	u16 psize;
+	u32 psize;
 	int ret = -EINVAL;
 
 	if (intf->cur_altsetting->desc.bInterfaceSubClass
@@ -772,7 +772,7 @@ static int uvc_parse_streaming(struct uvc_device *dev,
 				streaming->header.bEndpointAddress);
 		if (ep == NULL)
 			continue;
-		psize = uvc_endpoint_max_bpi(dev->udev, ep);
+		psize = usb_endpoint_max_isoc_bpi(dev->udev, ep);
 		if (psize > streaming->maxpsize)
 			streaming->maxpsize = psize;
 	}
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index e3567aeb0007..9f65cdbc1a1c 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -1895,24 +1895,6 @@ static void uvc_video_stop_transfer(struct uvc_streaming *stream,
 		uvc_free_urb_buffers(stream);
 }
 
-/*
- * Compute the maximum number of bytes per interval for an endpoint.
- */
-u16 uvc_endpoint_max_bpi(struct usb_device *dev, struct usb_host_endpoint *ep)
-{
-	u16 psize;
-
-	switch (dev->speed) {
-	case USB_SPEED_SUPER:
-	case USB_SPEED_SUPER_PLUS:
-		return le16_to_cpu(ep->ss_ep_comp.wBytesPerInterval);
-	default:
-		psize = usb_endpoint_maxp(&ep->desc);
-		psize *= usb_endpoint_maxp_mult(&ep->desc);
-		return psize;
-	}
-}
-
 /*
  * Initialize isochronous URBs and allocate transfer buffers. The packet size
  * is given by the endpoint.
@@ -1923,10 +1905,10 @@ static int uvc_init_video_isoc(struct uvc_streaming *stream,
 	struct urb *urb;
 	struct uvc_urb *uvc_urb;
 	unsigned int npackets, i;
-	u16 psize;
+	u32 psize;
 	u32 size;
 
-	psize = uvc_endpoint_max_bpi(stream->dev->udev, ep);
+	psize = usb_endpoint_max_isoc_bpi(stream->dev->udev, ep);
 	size = stream->ctrl.dwMaxVideoFrameSize;
 
 	npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags);
@@ -2067,7 +2049,7 @@ static int uvc_video_start_transfer(struct uvc_streaming *stream,
 				continue;
 
 			/* Check if the bandwidth is high enough. */
-			psize = uvc_endpoint_max_bpi(stream->dev->udev, ep);
+			psize = usb_endpoint_max_isoc_bpi(stream->dev->udev, ep);
 			if (psize >= bandwidth && psize < best_psize) {
 				altsetting = alts->desc.bAlternateSetting;
 				best_psize = psize;
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index b9f8eb62ba1d..a77ba76e033a 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -450,7 +450,7 @@ struct uvc_streaming {
 
 	struct usb_interface *intf;
 	int intfnum;
-	u16 maxpsize;
+	u32 maxpsize;
 
 	struct uvc_streaming_header header;
 	enum v4l2_buf_type type;
@@ -818,8 +818,6 @@ void uvc_ctrl_cleanup_fh(struct uvc_fh *handle);
 /* Utility functions */
 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
 					    u8 epaddr);
-u16 uvc_endpoint_max_bpi(struct usb_device *dev, struct usb_host_endpoint *ep);
-
 /* Quirks support */
 void uvc_video_decode_isight(struct uvc_urb *uvc_urb,
 			     struct uvc_buffer *buf,
-- 
2.39.5