[media] media: rcar-vin: make V4L2_FIELD_INTERLACED standard dependent

The field V4L2_FIELD_INTERLACED is standard dependent and should not
unconditionally be equivalent to V4L2_FIELD_INTERLACED_TB.

This patch adds a check to see if the video standard can be obtained and
if it's a 60 Hz format. If the condition is met V4L2_FIELD_INTERLACED
is treated as V4L2_FIELD_INTERLACED_BT if not as
V4L2_FIELD_INTERLACED_TB.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/rcar-vin/rcar-dma.c

@@ -131,6 +131,7 @@ static u32 rvin_read(struct rvin_dev *vin, u32 offset)
 static int rvin_setup(struct rvin_dev *vin)
 {
 	u32 vnmc, dmr, dmr2, interrupts;
+	v4l2_std_id std;
 	bool progressive = false, output_is_yuv = false, input_is_yuv = false;
 
 	switch (vin->format.field) {
@@ -141,6 +142,14 @@ static int rvin_setup(struct rvin_dev *vin)
 		vnmc = VNMC_IM_EVEN;
 		break;
 	case V4L2_FIELD_INTERLACED:
+		/* Default to TB */
+		vnmc = VNMC_IM_FULL;
+		/* Use BT if video standard can be read and is 60 Hz format */
+		if (!v4l2_subdev_call(vin_to_source(vin), video, g_std, &std)) {
+			if (std & V4L2_STD_525_60)
+				vnmc = VNMC_IM_FULL | VNMC_FOC;
+		}
+		break;
 	case V4L2_FIELD_INTERLACED_TB:
 		vnmc = VNMC_IM_FULL;
 		break;