[media] airspy: fill FMT buffer size

Fill FMT buffer size field in order to inform app which will be
used streaming buffer size. Currently driver doesn't allow buffer
size value proposed by application.

Cc: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/airspy/airspy.c

@@ -81,6 +81,7 @@ static const struct v4l2_frequency_band bands_rf[] = {
 struct airspy_format {
 	char	*name;
 	u32	pixelformat;
+	u32	buffersize;
 };
 
 /* format descriptions for capture and preview */
@@ -88,6 +89,7 @@ static struct airspy_format formats[] = {
 	{
 		.name		= "Real U12LE",
 		.pixelformat	= V4L2_SDR_FMT_RU12LE,
+		.buffersize	= BULK_BUFFER_SIZE,
 	},
 };
 
@@ -136,6 +138,7 @@ struct airspy {
 	unsigned int f_adc;
 	unsigned int f_rf;
 	u32 pixelformat;
+	u32 buffersize;
 
 	/* Controls */
 	struct v4l2_ctrl_handler hdl;
@@ -500,7 +503,7 @@ static int airspy_queue_setup(struct vb2_queue *vq,
 	if (vq->num_buffers + *nbuffers < 8)
 		*nbuffers = 8 - vq->num_buffers;
 	*nplanes = 1;
-	sizes[0] = PAGE_ALIGN(BULK_BUFFER_SIZE);
+	sizes[0] = PAGE_ALIGN(s->buffersize);
 
 	dev_dbg(&s->udev->dev, "%s: nbuffers=%d sizes[0]=%d\n",
 			__func__, *nbuffers, sizes[0]);
@@ -635,8 +638,9 @@ static int airspy_g_fmt_sdr_cap(struct file *file, void *priv,
 	dev_dbg(&s->udev->dev, "%s: pixelformat fourcc %4.4s\n", __func__,
 			(char *)&s->pixelformat);
 
-	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
 	f->fmt.sdr.pixelformat = s->pixelformat;
+	f->fmt.sdr.buffersize = s->buffersize;
+	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
 
 	return 0;
 }
@@ -657,13 +661,17 @@ static int airspy_s_fmt_sdr_cap(struct file *file, void *priv,
 	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
 	for (i = 0; i < NUM_FORMATS; i++) {
 		if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
-			s->pixelformat = f->fmt.sdr.pixelformat;
+			s->pixelformat = formats[i].pixelformat;
+			s->buffersize = formats[i].buffersize;
+			f->fmt.sdr.buffersize = formats[i].buffersize;
 			return 0;
 		}
 	}
 
-	f->fmt.sdr.pixelformat = formats[0].pixelformat;
 	s->pixelformat = formats[0].pixelformat;
+	s->buffersize = formats[0].buffersize;
+	f->fmt.sdr.pixelformat = formats[0].pixelformat;
+	f->fmt.sdr.buffersize = formats[0].buffersize;
 
 	return 0;
 }
@@ -679,11 +687,14 @@ static int airspy_try_fmt_sdr_cap(struct file *file, void *priv,
 
 	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
 	for (i = 0; i < NUM_FORMATS; i++) {
-		if (formats[i].pixelformat == f->fmt.sdr.pixelformat)
+		if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
+			f->fmt.sdr.buffersize = formats[i].buffersize;
 			return 0;
 		}
+	}
 
 	f->fmt.sdr.pixelformat = formats[0].pixelformat;
+	f->fmt.sdr.buffersize = formats[0].buffersize;
 
 	return 0;
 }
@@ -1003,7 +1014,8 @@ static int airspy_probe(struct usb_interface *intf,
 	s->udev = udev;
 	s->f_adc = bands[0].rangelow;
 	s->f_rf = bands_rf[0].rangelow;
-	s->pixelformat = V4L2_SDR_FMT_RU12LE;
+	s->pixelformat = formats[0].pixelformat;
+	s->buffersize = formats[0].buffersize;
 
 	/* Detect device */
 	ret = airspy_ctrl_msg(s, CMD_BOARD_ID_READ, 0, 0, &u8tmp, 1);