diff mbox

[v14,12/33] rcar-vin: fix handling of single field frames (top, bottom and alternate fields)

Message ID 20180414115726.5075-13-niklas.soderlund+renesas@ragnatech.se (mailing list archive)
State Not Applicable
Headers show

Commit Message

Niklas Söderlund April 14, 2018, 11:57 a.m. UTC 
There was never proper support in the VIN driver to deliver ALTERNATING
field format to user-space, remove this field option. The problem is
that ALTERNATING field order requires the sequence numbers of buffers
returned to userspace to reflect if fields were dropped or not,
something which is not possible with the VIN drivers capture logic.

The VIN driver can still capture from a video source which delivers
frames in ALTERNATING field order, but needs to combine them using the
VIN hardware into INTERLACED field order. Before this change if a source
was delivering fields using ALTERNATE the driver would default to
combining them using this hardware feature. Only if the user explicitly
requested ALTERNATE field order would incorrect frames be delivered.

The height should not be cut in half for the format for TOP or BOTTOM
fields settings. This was a mistake and it was made visible by the
scaling refactoring. Correct behavior is that the user should request a
frame size that fits the half height frame reflected in the field
setting. If not the VIN will do its best to scale the top or bottom to
the requested format and cropping and scaling do not work as expected.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

* Changes since v13
- Spelling dose -> does
- Add review tag from Laurent

* Changes since v12
- Spelling where -> were.
- Add review tag from Hans.
---
 drivers/media/platform/rcar-vin/rcar-dma.c  | 15 +----------
 drivers/media/platform/rcar-vin/rcar-v4l2.c | 40 +++++++----------------------
 2 files changed, 10 insertions(+), 45 deletions(-)
diff mbox

Patch

diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
index 4f48575f2008fe34..9233924e5b52de5f 100644
--- a/drivers/media/platform/rcar-vin/rcar-dma.c
+++ b/drivers/media/platform/rcar-vin/rcar-dma.c
@@ -617,7 +617,6 @@  static int rvin_setup(struct rvin_dev *vin)
 	case V4L2_FIELD_INTERLACED_BT:
 		vnmc = VNMC_IM_FULL | VNMC_FOC;
 		break;
-	case V4L2_FIELD_ALTERNATE:
 	case V4L2_FIELD_NONE:
 		vnmc = VNMC_IM_ODD_EVEN;
 		progressive = true;
@@ -745,18 +744,6 @@  static bool rvin_capture_active(struct rvin_dev *vin)
 	return rvin_read(vin, VNMS_REG) & VNMS_CA;
 }
 
-static enum v4l2_field rvin_get_active_field(struct rvin_dev *vin, u32 vnms)
-{
-	if (vin->format.field == V4L2_FIELD_ALTERNATE) {
-		/* If FS is set it's a Even field */
-		if (vnms & VNMS_FS)
-			return V4L2_FIELD_BOTTOM;
-		return V4L2_FIELD_TOP;
-	}
-
-	return vin->format.field;
-}
-
 static void rvin_set_slot_addr(struct rvin_dev *vin, int slot, dma_addr_t addr)
 {
 	const struct rvin_video_format *fmt;
@@ -892,7 +879,7 @@  static irqreturn_t rvin_irq(int irq, void *data)
 
 	/* Capture frame */
 	if (vin->queue_buf[slot]) {
-		vin->queue_buf[slot]->field = rvin_get_active_field(vin, vnms);
+		vin->queue_buf[slot]->field = vin->format.field;
 		vin->queue_buf[slot]->sequence = vin->sequence;
 		vin->queue_buf[slot]->vb2_buf.timestamp = ktime_get_ns();
 		vb2_buffer_done(&vin->queue_buf[slot]->vb2_buf,
diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c b/drivers/media/platform/rcar-vin/rcar-v4l2.c
index 16e895657c3f51c5..81a9aec96e8e664a 100644
--- a/drivers/media/platform/rcar-vin/rcar-v4l2.c
+++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c
@@ -121,33 +121,6 @@  static int rvin_reset_format(struct rvin_dev *vin)
 	vin->format.colorspace	= mf->colorspace;
 	vin->format.field	= mf->field;
 
-	/*
-	 * If the subdevice uses ALTERNATE field mode and G_STD is
-	 * implemented use the VIN HW to combine the two fields to
-	 * one INTERLACED frame. The ALTERNATE field mode can still
-	 * be requested in S_FMT and be respected, this is just the
-	 * default which is applied at probing or when S_STD is called.
-	 */
-	if (vin->format.field == V4L2_FIELD_ALTERNATE &&
-	    v4l2_subdev_has_op(vin_to_source(vin), video, g_std))
-		vin->format.field = V4L2_FIELD_INTERLACED;
-
-	switch (vin->format.field) {
-	case V4L2_FIELD_TOP:
-	case V4L2_FIELD_BOTTOM:
-	case V4L2_FIELD_ALTERNATE:
-		vin->format.height /= 2;
-		break;
-	case V4L2_FIELD_NONE:
-	case V4L2_FIELD_INTERLACED_TB:
-	case V4L2_FIELD_INTERLACED_BT:
-	case V4L2_FIELD_INTERLACED:
-		break;
-	default:
-		vin->format.field = RVIN_DEFAULT_FIELD;
-		break;
-	}
-
 	rvin_reset_crop_compose(vin);
 
 	vin->format.bytesperline = rvin_format_bytesperline(&vin->format);
@@ -235,15 +208,20 @@  static int __rvin_try_format(struct rvin_dev *vin,
 	switch (pix->field) {
 	case V4L2_FIELD_TOP:
 	case V4L2_FIELD_BOTTOM:
-	case V4L2_FIELD_ALTERNATE:
-		pix->height /= 2;
-		source->height /= 2;
-		break;
 	case V4L2_FIELD_NONE:
 	case V4L2_FIELD_INTERLACED_TB:
 	case V4L2_FIELD_INTERLACED_BT:
 	case V4L2_FIELD_INTERLACED:
 		break;
+	case V4L2_FIELD_ALTERNATE:
+		/*
+		 * Driver does not (yet) support outputting ALTERNATE to a
+		 * userspace. It does support outputting INTERLACED so use
+		 * the VIN hardware to combine the two fields.
+		 */
+		pix->field = V4L2_FIELD_INTERLACED;
+		pix->height *= 2;
+		break;
 	default:
 		pix->field = RVIN_DEFAULT_FIELD;
 		break;