[media] msi2500: 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: NAntti Palosaari <crope@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/msi2500/msi2500.c

@@ -74,6 +74,7 @@ static const struct v4l2_frequency_band bands[] = {
 struct msi3101_format {
 	char	*name;
 	u32	pixelformat;
+	u32	buffersize;
 };
 
 /* format descriptions for capture and preview */
@@ -81,6 +82,7 @@ static struct msi3101_format formats[] = {
 	{
 		.name		= "Complex S8",
 		.pixelformat	= V4L2_SDR_FMT_CS8,
+		.buffersize	= 3 * 1008,
 #if 0
 	}, {
 		.name		= "10+2-bit signed",
@@ -92,12 +94,15 @@ static struct msi3101_format formats[] = {
 	}, {
 		.name		= "Complex S14LE",
 		.pixelformat	= V4L2_SDR_FMT_CS14LE,
+		.buffersize	= 3 * 1008,
 	}, {
 		.name		= "Complex U8 (emulated)",
 		.pixelformat	= V4L2_SDR_FMT_CU8,
+		.buffersize	= 3 * 1008,
 	}, {
 		.name		= "Complex U16LE (emulated)",
 		.pixelformat	=  V4L2_SDR_FMT_CU16LE,
+		.buffersize	= 3 * 1008,
 	},
 };
 
@@ -129,6 +134,7 @@ struct msi3101_state {
 
 	unsigned int f_adc;
 	u32 pixelformat;
+	u32 buffersize;
 	unsigned int num_formats;
 
 	unsigned int isoc_errors; /* number of contiguous ISOC errors */
@@ -836,13 +842,7 @@ static int msi3101_queue_setup(struct vb2_queue *vq,
 	/* Absolute min and max number of buffers available for mmap() */
 	*nbuffers = clamp_t(unsigned int, *nbuffers, 8, 32);
 	*nplanes = 1;
-	/*
-	 *   3, wMaxPacketSize 3x 1024 bytes
-	 * 504, max IQ sample pairs per 1024 frame
-	 *   2, two samples, I and Q
-	 *   2, 16-bit is enough for single sample
-	 */
-	sizes[0] = PAGE_ALIGN(3 * 504 * 2 * 2);
+	sizes[0] = PAGE_ALIGN(s->buffersize);
 	dev_dbg(&s->udev->dev, "%s: nbuffers=%d sizes[0]=%d\n",
 			__func__, *nbuffers, sizes[0]);
 	return 0;
@@ -1134,8 +1134,9 @@ static int msi3101_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;
 }
@@ -1155,13 +1156,17 @@ static int msi3101_s_fmt_sdr_cap(struct file *file, void *priv,
 	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
 	for (i = 0; i < s->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;
 }
@@ -1176,11 +1181,14 @@ static int msi3101_try_fmt_sdr_cap(struct file *file, void *priv,
 
 	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
 	for (i = 0; i < s->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;
 }
@@ -1402,6 +1410,7 @@ static int msi3101_probe(struct usb_interface *intf,
 	s->udev = udev;
 	s->f_adc = bands[0].rangelow;
 	s->pixelformat = formats[0].pixelformat;
+	s->buffersize = formats[0].buffersize;
 	s->num_formats = NUM_FORMATS;
 	if (msi3101_emulated_fmt == false)
 		s->num_formats -= 2;