Re: [PATCH v5 02/12] gpu: ipu-csi: Swap fields according to input/output field types

From: Steve Longerbeam
Date: Fri Dec 14 2018 - 18:40:15 EST

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In reply to: Philipp Zabel: "Re: [PATCH v5 02/12] gpu: ipu-csi: Swap fields according to input/output field types"
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On 12/13/18 4:59 AM, Philipp Zabel wrote:

Hi Steve,

On Tue, 2018-10-16 at 17:00 -0700, Steve Longerbeam wrote:

The function ipu_csi_init_interface() was inverting the F-bit for
NTSC case, in the CCIR_CODE_1/2 registers. The result being that
for NTSC bottom-top field order, the CSI would swap fields and
capture in top-bottom order.

Instead, base field swap on the field order of the input to the CSI,
and the field order of the requested output. If the input/output
fields are sequential but different, swap fields, otherwise do
not swap. This requires passing both the input and output mbus
frame formats to ipu_csi_init_interface().

Move this code to a new private function ipu_csi_set_bt_interlaced_codes()
that programs the CCIR_CODE_1/2 registers for interlaced BT.656 (and
possibly interlaced BT.1120 in the future).

When detecting input video standard from the input frame width/height,
make sure to double height if input field type is alternate, since
in that case input height only includes lines for one field.

Signed-off-by: Steve Longerbeam <slongerbeam@xxxxxxxxx>
---
Changes since v4:
- Cleaned up some convoluted code in ipu_csi_init_interface(), suggested
by Philipp Zabel.
- Fixed a regression in csi_setup(), caught by Philipp.
---
drivers/gpu/ipu-v3/ipu-csi.c | 119 +++++++++++++++-------
drivers/staging/media/imx/imx-media-csi.c | 17 +---
include/video/imx-ipu-v3.h | 3 +-
3 files changed, 88 insertions(+), 51 deletions(-)

diff --git a/drivers/gpu/ipu-v3/ipu-csi.c b/drivers/gpu/ipu-v3/ipu-csi.c
index aa0e30a2ba18..4a15e513fa05 100644
--- a/drivers/gpu/ipu-v3/ipu-csi.c
+++ b/drivers/gpu/ipu-v3/ipu-csi.c
@@ -325,6 +325,15 @@ static int mbus_code_to_bus_cfg(struct ipu_csi_bus_config *cfg, u32 mbus_code,
return 0;
}
+/* translate alternate field mode based on given standard */
+static inline enum v4l2_field
+ipu_csi_translate_field(enum v4l2_field field, v4l2_std_id std)
+{
+ return (field != V4L2_FIELD_ALTERNATE) ? field :
+ ((std & V4L2_STD_525_60) ?
+ V4L2_FIELD_SEQ_BT : V4L2_FIELD_SEQ_TB);
+}
+
/*
* Fill a CSI bus config struct from mbus_config and mbus_framefmt.
*/
@@ -374,22 +383,75 @@ static int fill_csi_bus_cfg(struct ipu_csi_bus_config *csicfg,
return 0;
}
+static int ipu_csi_set_bt_interlaced_codes(struct ipu_csi *csi,
+ struct v4l2_mbus_framefmt *infmt,
+ struct v4l2_mbus_framefmt *outfmt,

infmt and outfmt parameters could be const.

Agreed, I will convert these pointer args to const. And since we are changing the API to ipu_csi_init_interface() anyway, I went ahead and converted the mbus_cfg, infmt, and outfmt pointer args to const there as well.

+ v4l2_std_id std)
+{
+ enum v4l2_field infield, outfield;
+ bool swap_fields;
+
+ /* get translated field type of input and output */
+ infield = ipu_csi_translate_field(infmt->field, std);
+ outfield = ipu_csi_translate_field(outfmt->field, std);
+
+ /*
+ * Write the H-V-F codes the CSI will match against the
+ * incoming data for start/end of active and blanking
+ * field intervals. If input and output field types are
+ * sequential but not the same (one is SEQ_BT and the other
+ * is SEQ_TB), swap the F-bit so that the CSI will capture
+ * field 1 lines before field 0 lines.
+ */
+ swap_fields = (V4L2_FIELD_IS_SEQUENTIAL(infield) &&
+ V4L2_FIELD_IS_SEQUENTIAL(outfield) &&
+ infield != outfield);
+
+ if (!swap_fields) {
+ /*
+ * Field0BlankEnd = 110, Field0BlankStart = 010
+ * Field0ActiveEnd = 100, Field0ActiveStart = 000
+ * Field1BlankEnd = 111, Field1BlankStart = 011
+ * Field1ActiveEnd = 101, Field1ActiveStart = 001
+ */
+ ipu_csi_write(csi, 0x40596 | CSI_CCIR_ERR_DET_EN,
+ CSI_CCIR_CODE_1);
+ ipu_csi_write(csi, 0xD07DF, CSI_CCIR_CODE_2);
+ } else {
+ dev_dbg(csi->ipu->dev, "capture field swap\n");
+
+ /* same as above but with F-bit inverted */
+ ipu_csi_write(csi, 0xD07DF | CSI_CCIR_ERR_DET_EN,
+ CSI_CCIR_CODE_1);
+ ipu_csi_write(csi, 0x40596, CSI_CCIR_CODE_2);
+ }
+
+ ipu_csi_write(csi, 0xFF0000, CSI_CCIR_CODE_3);
+
+ return 0;
+}
+
+
int ipu_csi_init_interface(struct ipu_csi *csi,
struct v4l2_mbus_config *mbus_cfg,
- struct v4l2_mbus_framefmt *mbus_fmt)
+ struct v4l2_mbus_framefmt *infmt,
+ struct v4l2_mbus_framefmt *outfmt)
{
struct ipu_csi_bus_config cfg;
unsigned long flags;
u32 width, height, data = 0;
+ v4l2_std_id std;
int ret;
- ret = fill_csi_bus_cfg(&cfg, mbus_cfg, mbus_fmt);
+ ret = fill_csi_bus_cfg(&cfg, mbus_cfg, infmt);
if (ret < 0)
return ret;
/* set default sensor frame width and height */
- width = mbus_fmt->width;
- height = mbus_fmt->height;
+ width = infmt->width;
+ height = infmt->height;
+ if (infmt->field == V4L2_FIELD_ALTERNATE)
+ height *= 2;
/* Set the CSI_SENS_CONF register remaining fields */
data |= cfg.data_width << CSI_SENS_CONF_DATA_WIDTH_SHIFT |
@@ -416,42 +478,22 @@ int ipu_csi_init_interface(struct ipu_csi *csi,
ipu_csi_write(csi, 0xFF0000, CSI_CCIR_CODE_3);
break;
case IPU_CSI_CLK_MODE_CCIR656_INTERLACED:
- if (mbus_fmt->width == 720 && mbus_fmt->height == 576) {
- /*
- * PAL case
- *
- * Field0BlankEnd = 0x6, Field0BlankStart = 0x2,
- * Field0ActiveEnd = 0x4, Field0ActiveStart = 0
- * Field1BlankEnd = 0x7, Field1BlankStart = 0x3,
- * Field1ActiveEnd = 0x5, Field1ActiveStart = 0x1
- */
- height = 625; /* framelines for PAL */
-
- ipu_csi_write(csi, 0x40596 | CSI_CCIR_ERR_DET_EN,
- CSI_CCIR_CODE_1);
- ipu_csi_write(csi, 0xD07DF, CSI_CCIR_CODE_2);
- ipu_csi_write(csi, 0xFF0000, CSI_CCIR_CODE_3);
- } else if (mbus_fmt->width == 720 && mbus_fmt->height == 480) {
- /*
- * NTSC case
- *
- * Field0BlankEnd = 0x7, Field0BlankStart = 0x3,
- * Field0ActiveEnd = 0x5, Field0ActiveStart = 0x1
- * Field1BlankEnd = 0x6, Field1BlankStart = 0x2,
- * Field1ActiveEnd = 0x4, Field1ActiveStart = 0
- */
- height = 525; /* framelines for NTSC */
-
- ipu_csi_write(csi, 0xD07DF | CSI_CCIR_ERR_DET_EN,
- CSI_CCIR_CODE_1);
- ipu_csi_write(csi, 0x40596, CSI_CCIR_CODE_2);
- ipu_csi_write(csi, 0xFF0000, CSI_CCIR_CODE_3);
+ if (width == 720 && height == 480) {
+ std = V4L2_STD_NTSC;
+ height = 525;
+ } else if (width == 720 && height == 576) {
+ std = V4L2_STD_PAL;
+ height = 625;
} else {
dev_err(csi->ipu->dev,
- "Unsupported CCIR656 interlaced video mode\n");
- spin_unlock_irqrestore(&csi->lock, flags);
- return -EINVAL;
+ "Unsupported interlaced video mode\n");
+ ret = -EINVAL;
+ goto out_unlock;
}
+
+ ret = ipu_csi_set_bt_interlaced_codes(csi, infmt, outfmt, std);
+ if (ret)
+ goto out_unlock;
break;
case IPU_CSI_CLK_MODE_CCIR1120_PROGRESSIVE_DDR:
case IPU_CSI_CLK_MODE_CCIR1120_PROGRESSIVE_SDR:
@@ -476,9 +518,10 @@ int ipu_csi_init_interface(struct ipu_csi *csi,
dev_dbg(csi->ipu->dev, "CSI_ACT_FRM_SIZE = 0x%08X\n",
ipu_csi_read(csi, CSI_ACT_FRM_SIZE));
+out_unlock:
spin_unlock_irqrestore(&csi->lock, flags);
- return 0;
+ return ret;
}
EXPORT_SYMBOL_GPL(ipu_csi_init_interface);
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 4223f8d418ae..7ecbd4d76d09 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -663,15 +663,14 @@ static void csi_idmac_stop(struct csi_priv *priv)
/* Update the CSI whole sensor and active windows */
static int csi_setup(struct csi_priv *priv)
{
- struct v4l2_mbus_framefmt *infmt, *outfmt;
+ struct v4l2_mbus_framefmt infmt, outfmt;
const struct imx_media_pixfmt *incc;
struct v4l2_mbus_config mbus_cfg;
- struct v4l2_mbus_framefmt if_fmt;
struct v4l2_rect crop;
- infmt = &priv->format_mbus[CSI_SINK_PAD];
+ infmt = priv->format_mbus[CSI_SINK_PAD];

Maybe still call this if_fmt, or maybe csi_fmt, to indicate this is not
just the userspace visible input format as determined by the pad, but
the modified format we set the interface to? Not a strong preference,
though.

Ok, I brought back if_fmt.

incc = priv->cc[CSI_SINK_PAD];
- outfmt = &priv->format_mbus[priv->active_output_pad];
+ outfmt = priv->format_mbus[priv->active_output_pad];

Copying the output format onto the stack seems unnecessary to me.

Yes, I did this for consistency with on-stack infmt, but it's not necessary, I restored outfmt to a pointer.

/* compose mbus_config from the upstream endpoint */
mbus_cfg.type = priv->upstream_ep.bus_type;
@@ -679,12 +678,6 @@ static int csi_setup(struct csi_priv *priv)
priv->upstream_ep.bus.parallel.flags :
priv->upstream_ep.bus.mipi_csi2.flags;
- /*
- * we need to pass input frame to CSI interface, but
- * with translated field type from output format
- */
- if_fmt = *infmt;
- if_fmt.field = outfmt->field;
crop = priv->crop;
/*
@@ -692,7 +685,7 @@ static int csi_setup(struct csi_priv *priv)
* generic/bayer data
*/
if (is_parallel_bus(&priv->upstream_ep) && incc->cycles) {
- if_fmt.width *= incc->cycles;
+ infmt.width *= incc->cycles;
crop.width *= incc->cycles;
}
@@ -702,7 +695,7 @@ static int csi_setup(struct csi_priv *priv)
priv->crop.width == 2 * priv->compose.width,
priv->crop.height == 2 * priv->compose.height);
- ipu_csi_init_interface(priv->csi, &mbus_cfg, &if_fmt);
+ ipu_csi_init_interface(priv->csi, &mbus_cfg, &infmt, &outfmt);

We can just pass the &priv->format_mbus[priv->active_output_pad] here,
or keep using struct v4l2_mbus_framefmt *outfmt as a shorthand.

I just kept it as a short-hand.

Steve

ipu_csi_set_dest(priv->csi, priv->dest);
diff --git a/include/video/imx-ipu-v3.h b/include/video/imx-ipu-v3.h
index abbad94e14a1..f44a35192313 100644
--- a/include/video/imx-ipu-v3.h
+++ b/include/video/imx-ipu-v3.h
@@ -352,7 +352,8 @@ int ipu_prg_channel_configure(struct ipuv3_channel *ipu_chan,
struct ipu_csi;
int ipu_csi_init_interface(struct ipu_csi *csi,
struct v4l2_mbus_config *mbus_cfg,
- struct v4l2_mbus_framefmt *mbus_fmt);
+ struct v4l2_mbus_framefmt *infmt,
+ struct v4l2_mbus_framefmt *outfmt);
bool ipu_csi_is_interlaced(struct ipu_csi *csi);
void ipu_csi_get_window(struct ipu_csi *csi, struct v4l2_rect *w);
void ipu_csi_set_window(struct ipu_csi *csi, struct v4l2_rect *w);

Either way,
Reviewed-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>

regards
Philipp

Next message: Steve Longerbeam: "[PATCH v6] gpu: ipu-csi: Swap fields according to input/output field types"
Previous message: David Miller: "Re: [PATCH] ip6mr: Fix potential Spectre v1 vulnerability"
In reply to: Philipp Zabel: "Re: [PATCH v5 02/12] gpu: ipu-csi: Swap fields according to input/output field types"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]