[PATCH v5 11/12] media: imx: Allow interweave with top/bottom lines swapped

Steve Longerbeam
2018-10-17T00:00:59Z

Allow sequential->interlaced interweaving but with top/bottom
lines swapped to the output buffer.

This can be accomplished by adding one line length to IDMAC output
channel address, with a negative line length for the interlace offset.

This is to allow the seq-bt -> interlaced-bt transformation, where
bottom lines are still dominant (older in time) but with top lines
first in the interweaved output buffer.

With this support, the CSI can now allow seq-bt at its source pads,
e.g. the following transformations are allowed in CSI from sink to
source:

seq-tb -> seq-bt
seq-bt -> seq-bt
alternate -> seq-bt

Suggested-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
---
Changes since v4:
- Removed interweave_offset and replace with boolean interweave_swap,
suggested by Philipp Zabel.
---
drivers/staging/media/imx/imx-ic-prpencvf.c | 25 +++++++++----
drivers/staging/media/imx/imx-media-csi.c | 40 ++++++++++++++++++---
2 files changed, 54 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c b/drivers/staging/media/imx/imx-ic-prpencvf.c
index cf76b0432371..33ada6612fee 100644
--- a/drivers/staging/media/imx/imx-ic-prpencvf.c
+++ b/drivers/staging/media/imx/imx-ic-prpencvf.c
@@ -106,6 +106,7 @@ struct prp_priv {
u32 frame_sequence; /* frame sequence counter */
bool last_eof; /* waiting for last EOF at stream off */
bool nfb4eof; /* NFB4EOF encountered during streaming */
+ bool interweave_swap; /* swap top/bottom lines when interweaving */
struct completion last_eof_comp;
};

@@ -235,6 +236,9 @@ static void prp_vb2_buf_done(struct prp_priv *priv, struct ipuv3_channel *ch)
if (ipu_idmac_buffer_is_ready(ch, priv->ipu_buf_num))
ipu_idmac_clear_buffer(ch, priv->ipu_buf_num);

+ if (priv->interweave_swap && ch == priv->out_ch)
+ phys += vdev->fmt.fmt.pix.bytesperline;
+
ipu_cpmem_set_buffer(ch, priv->ipu_buf_num, phys);
}

@@ -376,8 +380,9 @@ static int prp_setup_channel(struct prp_priv *priv,
* the IDMAC output channel.
*/
interweave = V4L2_FIELD_IS_INTERLACED(image.pix.field) &&
- V4L2_FIELD_IS_SEQUENTIAL(outfmt->field) &&
- channel == priv->out_ch;
+ V4L2_FIELD_IS_SEQUENTIAL(outfmt->field);
+ priv->interweave_swap = interweave &&
+ image.pix.field == V4L2_FIELD_INTERLACED_BT;

if (rot_swap_width_height) {
swap(image.pix.width, image.pix.height);
@@ -388,6 +393,11 @@ static int prp_setup_channel(struct prp_priv *priv,
(image.pix.width * outcc->bpp) >> 3;
}

+ if (priv->interweave_swap && channel == priv->out_ch) {
+ /* start interweave scan at 1st top line (2nd line) */
+ image.rect.top = 1;
+ }
+
image.phys0 = addr0;
image.phys1 = addr1;

@@ -396,8 +406,8 @@ static int prp_setup_channel(struct prp_priv *priv,
* channels for planar 4:2:0 (but not when enabling IDMAC
* interweaving, they are incompatible).
*/
- if (!interweave && (channel == priv->out_ch ||
- channel == priv->rot_out_ch)) {
+ if ((channel == priv->out_ch && !interweave) ||
+ channel == priv->rot_out_ch) {
switch (image.pix.pixelformat) {
case V4L2_PIX_FMT_YUV420:
case V4L2_PIX_FMT_YVU420:
@@ -424,8 +434,11 @@ static int prp_setup_channel(struct prp_priv *priv,
if (rot_mode)
ipu_cpmem_set_rotation(channel, rot_mode);

- if (interweave)
- ipu_cpmem_interlaced_scan(channel, image.pix.bytesperline,
+ if (interweave && channel == priv->out_ch)
+ ipu_cpmem_interlaced_scan(channel,
+ priv->interweave_swap ?
+ -image.pix.bytesperline :
+ image.pix.bytesperline,
image.pix.pixelformat);

ret = ipu_ic_task_idma_init(priv->ic, channel,
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 0d494a7db211..73c9f3ae4221 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -114,6 +114,7 @@ struct csi_priv {
u32 frame_sequence; /* frame sequence counter */
bool last_eof; /* waiting for last EOF at stream off */
bool nfb4eof; /* NFB4EOF encountered during streaming */
+ bool interweave_swap; /* swap top/bottom lines when interweaving */
struct completion last_eof_comp;
};

@@ -286,6 +287,9 @@ static void csi_vb2_buf_done(struct csi_priv *priv)
if (ipu_idmac_buffer_is_ready(priv->idmac_ch, priv->ipu_buf_num))
ipu_idmac_clear_buffer(priv->idmac_ch, priv->ipu_buf_num);

+ if (priv->interweave_swap)
+ phys += vdev->fmt.fmt.pix.bytesperline;
+
ipu_cpmem_set_buffer(priv->idmac_ch, priv->ipu_buf_num, phys);
}

@@ -433,6 +437,8 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
*/
interweave = V4L2_FIELD_IS_INTERLACED(image.pix.field) &&
V4L2_FIELD_IS_SEQUENTIAL(outfmt->field);
+ priv->interweave_swap = interweave &&
+ image.pix.field == V4L2_FIELD_INTERLACED_BT;

switch (image.pix.pixelformat) {
case V4L2_PIX_FMT_SBGGR8:
@@ -486,6 +492,12 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
}

if (passthrough) {
+ if (priv->interweave_swap) {
+ /* start interweave scan at 1st top line (2nd line) */
+ image.phys0 += image.pix.bytesperline;
+ image.phys1 += image.pix.bytesperline;
+ }
+
ipu_cpmem_set_resolution(priv->idmac_ch,
image.rect.width * passthrough_cycles,
image.rect.height);
@@ -495,6 +507,11 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
ipu_cpmem_set_format_passthrough(priv->idmac_ch,
passthrough_bits);
} else {
+ if (priv->interweave_swap) {
+ /* start interweave scan at 1st top line (2nd line) */
+ image.rect.top = 1;
+ }
+
ret = ipu_cpmem_set_image(priv->idmac_ch, &image);
if (ret)
goto unsetup_vb2;
@@ -526,6 +543,8 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)

if (interweave)
ipu_cpmem_interlaced_scan(priv->idmac_ch,
+ priv->interweave_swap ?
+ -image.pix.bytesperline :
image.pix.bytesperline,
image.pix.pixelformat);

@@ -1336,16 +1355,27 @@ static void csi_try_field(struct csi_priv *priv,
switch (infmt->field) {
case V4L2_FIELD_SEQ_TB:
case V4L2_FIELD_SEQ_BT:
+ /*
+ * If the user requests sequential at the source pad,
+ * allow it (along with possibly inverting field order).
+ * Otherwise passthrough the field type.
+ */
+ if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
+ sdformat->format.field = infmt->field;
+ break;
case V4L2_FIELD_ALTERNATE:
/*
- * If the sink is sequential or alternating fields,
- * allow only SEQ_TB at the source.
- *
* This driver does not support alternate field mode, and
* the CSI captures a whole frame, so the CSI never presents
- * alternate mode at its source pads.
+ * alternate mode at its source pads. If user has not
+ * already requested sequential, translate ALTERNATE at
+ * sink pad to SEQ_TB or SEQ_BT at the source pad depending
+ * on input height (assume NTSC BT order if 480 total active
+ * frame lines, otherwise PAL TB order).
*/
- sdformat->format.field = V4L2_FIELD_SEQ_TB;
+ if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
+ sdformat->format.field = (infmt->height == 480 / 2) ?
+ V4L2_FIELD_SEQ_BT : V4L2_FIELD_SEQ_TB;
break;
default:
/* Passthrough for all other input field types */
--
2.17.1