---

yaml
---
r: 137931
b: refs/heads/master
c: 50144ae
h: refs/heads/master
i:
  137929: 49cba2b
  137927: 6fadeae
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c90e777976f6237a0cdb644c6a9406907939b174
+refs/heads/master: 50144aeeb702ea105697ae5249f059ea3990b838

trunk/drivers/media/video/uvc/uvc_driver.c

@@ -1861,6 +1861,15 @@ static struct usb_device_id uvc_ids[] = {
 	  .bInterfaceSubClass	= 1,
 	  .bInterfaceProtocol	= 0,
 	  .driver_info		= UVC_QUIRK_STREAM_NO_FID },
+	/* ViMicro */
+	{ .match_flags		= USB_DEVICE_ID_MATCH_VENDOR
+				| USB_DEVICE_ID_MATCH_INT_INFO,
+	  .idVendor		= 0x0ac8,
+	  .idProduct		= 0x0000,
+	  .bInterfaceClass	= USB_CLASS_VIDEO,
+	  .bInterfaceSubClass	= 1,
+	  .bInterfaceProtocol	= 0,
+	  .driver_info		= UVC_QUIRK_FIX_BANDWIDTH },
 	/* MT6227 */
 	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
 				| USB_DEVICE_ID_MATCH_INT_INFO,

trunk/drivers/media/video/uvc/uvc_video.c

@@ -61,7 +61,7 @@ int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
 	return 0;
 }
 
-static void uvc_fixup_buffer_size(struct uvc_video_device *video,
+static void uvc_fixup_video_ctrl(struct uvc_video_device *video,
 	struct uvc_streaming_control *ctrl)
 {
 	struct uvc_format *format;
@@ -84,6 +84,31 @@ static void uvc_fixup_buffer_size(struct uvc_video_device *video,
 	      video->dev->uvc_version < 0x0110))
 		ctrl->dwMaxVideoFrameSize =
 			frame->dwMaxVideoFrameBufferSize;
+
+	if (video->dev->quirks & UVC_QUIRK_FIX_BANDWIDTH &&
+	    video->streaming->intf->num_altsetting > 1) {
+		u32 interval;
+		u32 bandwidth;
+
+		interval = (ctrl->dwFrameInterval > 100000)
+			 ? ctrl->dwFrameInterval
+			 : frame->dwFrameInterval[0];
+
+		/* Compute a bandwidth estimation by multiplying the frame
+		 * size by the number of video frames per second, divide the
+		 * result by the number of USB frames (or micro-frames for
+		 * high-speed devices) per second and add the UVC header size
+		 * (assumed to be 12 bytes long).
+		 */
+		bandwidth = frame->wWidth * frame->wHeight / 8 * format->bpp;
+		bandwidth *= 10000000 / interval + 1;
+		bandwidth /= 1000;
+		if (video->dev->udev->speed == USB_SPEED_HIGH)
+			bandwidth /= 8;
+		bandwidth += 12;
+
+		ctrl->dwMaxPayloadTransferSize = bandwidth;
+	}
 }
 
 static int uvc_get_video_ctrl(struct uvc_video_device *video,
@@ -158,10 +183,11 @@ static int uvc_get_video_ctrl(struct uvc_video_device *video,
 		ctrl->bMaxVersion = 0;
 	}
 
-	/* Some broken devices return a null or wrong dwMaxVideoFrameSize.
-	 * Try to get the value from the format and frame descriptors.
+	/* Some broken devices return null or wrong dwMaxVideoFrameSize and
+	 * dwMaxPayloadTransferSize fields. Try to get the value from the
+	 * format and frame descriptors.
 	 */
-	uvc_fixup_buffer_size(video, ctrl);
+	uvc_fixup_video_ctrl(video, ctrl);
 	ret = 0;
 
 out:

trunk/drivers/media/video/uvc/uvcvideo.h

@@ -314,6 +314,7 @@ struct uvc_xu_control {
 #define UVC_QUIRK_STREAM_NO_FID		0x00000010
 #define UVC_QUIRK_IGNORE_SELECTOR_UNIT	0x00000020
 #define UVC_QUIRK_PRUNE_CONTROLS	0x00000040
+#define UVC_QUIRK_FIX_BANDWIDTH		0x00000080
 
 /* Format flags */
 #define UVC_FMT_FLAG_COMPRESSED		0x00000001