[media] V4L: pxa-camera: try to force progressive video format

The pxa-camera driver only supports progressive video so far. Passing
down to the client the same format, as what the user has requested can
result in interlaced video, even if the client supports both. This
patch avoids such cases.
Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/pxa_camera.c

@@ -1501,7 +1501,8 @@ static int pxa_camera_try_fmt(struct soc_camera_device *icd,
 	/* limit to sensor capabilities */
 	mf.width	= pix->width;
 	mf.height	= pix->height;
-	mf.field	= pix->field;
+	/* Only progressive video supported so far */
+	mf.field	= V4L2_FIELD_NONE;
 	mf.colorspace	= pix->colorspace;
 	mf.code		= xlate->code;