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media: imx219: Advertise embedded data node on media pad 1
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This commit updates the imx219 driver to adverise support for embedded
data streams.  This can then be used by the bcm2835-unicam driver, which
has recently been updated to expose the embedded data stream to
userland.

The imx219 sensor subdevice overloads the media pad to differentiate
between image stream (pad 0) and embedded data stream (pad 1) when
performing the v4l2_subdev_pad_ops functions.

Signed-off-by: Naushir Patuck <[email protected]>
Signed-off-by: Dave Stevenson <[email protected]>
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@naushir @popcornmix
naushir authored and popcornmix committed Mar 14, 2023
1 parent 7032a77 commit e3376fb
Showing 1 changed file with 161 additions and 82 deletions.
243 changes: 161 additions & 82 deletions drivers/media/i2c/imx219.c
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Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,16 @@
#define IMX219_PIXEL_ARRAY_WIDTH 3280U
#define IMX219_PIXEL_ARRAY_HEIGHT 2464U

/* Embedded metadata stream structure */
#define IMX219_EMBEDDED_LINE_WIDTH 16384
#define IMX219_NUM_EMBEDDED_LINES 1

enum pad_types {
IMAGE_PAD,
METADATA_PAD,
NUM_PADS
};

struct imx219_reg {
u16 address;
u8 val;
Expand Down Expand Up @@ -448,7 +458,7 @@ static const struct imx219_mode supported_modes[] = {

struct imx219 {
struct v4l2_subdev sd;
struct media_pad pad;
struct media_pad pad[NUM_PADS];

struct v4l2_mbus_framefmt fmt;

Expand Down Expand Up @@ -598,18 +608,26 @@ static void imx219_set_default_format(struct imx219 *imx219)
static int imx219_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
struct imx219 *imx219 = to_imx219(sd);
struct v4l2_mbus_framefmt *try_fmt =
v4l2_subdev_get_try_format(sd, fh->state, 0);
struct v4l2_mbus_framefmt *try_fmt_img =
v4l2_subdev_get_try_format(sd, fh->state, IMAGE_PAD);
struct v4l2_mbus_framefmt *try_fmt_meta =
v4l2_subdev_get_try_format(sd, fh->state, METADATA_PAD);
struct v4l2_rect *try_crop;

mutex_lock(&imx219->mutex);

/* Initialize try_fmt */
try_fmt->width = supported_modes[0].width;
try_fmt->height = supported_modes[0].height;
try_fmt->code = imx219_get_format_code(imx219,
MEDIA_BUS_FMT_SRGGB10_1X10);
try_fmt->field = V4L2_FIELD_NONE;
try_fmt_img->width = supported_modes[0].width;
try_fmt_img->height = supported_modes[0].height;
try_fmt_img->code = imx219_get_format_code(imx219,
MEDIA_BUS_FMT_SRGGB10_1X10);
try_fmt_img->field = V4L2_FIELD_NONE;

/* Initialize try_fmt for the embedded metadata pad */
try_fmt_meta->width = IMX219_EMBEDDED_LINE_WIDTH;
try_fmt_meta->height = IMX219_NUM_EMBEDDED_LINES;
try_fmt_meta->code = MEDIA_BUS_FMT_SENSOR_DATA;
try_fmt_meta->field = V4L2_FIELD_NONE;

/* Initialize try_crop rectangle. */
try_crop = v4l2_subdev_get_try_crop(sd, fh->state, 0);
Expand Down Expand Up @@ -723,12 +741,22 @@ static int imx219_enum_mbus_code(struct v4l2_subdev *sd,
{
struct imx219 *imx219 = to_imx219(sd);

if (code->index >= (ARRAY_SIZE(codes) / 4))
if (code->pad >= NUM_PADS)
return -EINVAL;

mutex_lock(&imx219->mutex);
code->code = imx219_get_format_code(imx219, codes[code->index * 4]);
mutex_unlock(&imx219->mutex);
if (code->pad == IMAGE_PAD) {
if (code->index >= (ARRAY_SIZE(codes) / 4))
return -EINVAL;

mutex_lock(&imx219->mutex);
code->code = imx219_get_format_code(imx219, codes[code->index * 4]);
mutex_unlock(&imx219->mutex);
} else {
if (code->index > 0)
return -EINVAL;

code->code = MEDIA_BUS_FMT_SENSOR_DATA;
}

return 0;
}
Expand All @@ -740,19 +768,32 @@ static int imx219_enum_frame_size(struct v4l2_subdev *sd,
struct imx219 *imx219 = to_imx219(sd);
u32 code;

if (fse->index >= ARRAY_SIZE(supported_modes))
if (fse->pad >= NUM_PADS)
return -EINVAL;

mutex_lock(&imx219->mutex);
code = imx219_get_format_code(imx219, fse->code);
mutex_unlock(&imx219->mutex);
if (fse->code != code)
return -EINVAL;
if (fse->pad == IMAGE_PAD) {
if (fse->index >= ARRAY_SIZE(supported_modes))
return -EINVAL;

mutex_lock(&imx219->mutex);
code = imx219_get_format_code(imx219, fse->code);
mutex_unlock(&imx219->mutex);
if (fse->code != code)
return -EINVAL;

fse->min_width = supported_modes[fse->index].width;
fse->max_width = fse->min_width;
fse->min_height = supported_modes[fse->index].height;
fse->max_height = fse->min_height;
} else {
if (fse->code != MEDIA_BUS_FMT_SENSOR_DATA || fse->index > 0)
return -EINVAL;

fse->min_width = supported_modes[fse->index].width;
fse->max_width = fse->min_width;
fse->min_height = supported_modes[fse->index].height;
fse->max_height = fse->min_height;
fse->min_width = IMX219_EMBEDDED_LINE_WIDTH;
fse->max_width = fse->min_width;
fse->min_height = IMX219_NUM_EMBEDDED_LINES;
fse->max_height = fse->min_height;
}

return 0;
}
Expand All @@ -767,31 +808,49 @@ static void imx219_reset_colorspace(struct v4l2_mbus_framefmt *fmt)
fmt->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(fmt->colorspace);
}

static void imx219_update_pad_format(struct imx219 *imx219,
const struct imx219_mode *mode,
struct v4l2_subdev_format *fmt)
static void imx219_update_image_pad_format(struct imx219 *imx219,
const struct imx219_mode *mode,
struct v4l2_subdev_format *fmt)
{
fmt->format.width = mode->width;
fmt->format.height = mode->height;
fmt->format.field = V4L2_FIELD_NONE;
imx219_reset_colorspace(&fmt->format);
}

static void imx219_update_metadata_pad_format(struct v4l2_subdev_format *fmt)
{
fmt->format.width = IMX219_EMBEDDED_LINE_WIDTH;
fmt->format.height = IMX219_NUM_EMBEDDED_LINES;
fmt->format.code = MEDIA_BUS_FMT_SENSOR_DATA;
fmt->format.field = V4L2_FIELD_NONE;
}

static int __imx219_get_pad_format(struct imx219 *imx219,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *fmt)
{
if (fmt->pad >= NUM_PADS)
return -EINVAL;

if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
struct v4l2_mbus_framefmt *try_fmt =
v4l2_subdev_get_try_format(&imx219->sd, sd_state,
fmt->pad);
/* update the code which could change due to vflip or hflip: */
try_fmt->code = imx219_get_format_code(imx219, try_fmt->code);
try_fmt->code = fmt->pad == IMAGE_PAD ?
imx219_get_format_code(imx219, try_fmt->code) :
MEDIA_BUS_FMT_SENSOR_DATA;
fmt->format = *try_fmt;
} else {
imx219_update_pad_format(imx219, imx219->mode, fmt);
fmt->format.code = imx219_get_format_code(imx219,
imx219->fmt.code);
if (fmt->pad == IMAGE_PAD) {
imx219_update_image_pad_format(imx219, imx219->mode,
fmt);
fmt->format.code = imx219_get_format_code(imx219,
imx219->fmt.code);
} else {
imx219_update_metadata_pad_format(fmt);
}
}

return 0;
Expand Down Expand Up @@ -821,59 +880,78 @@ static int imx219_set_pad_format(struct v4l2_subdev *sd,
int exposure_max, exposure_def, hblank;
unsigned int i;

mutex_lock(&imx219->mutex);

for (i = 0; i < ARRAY_SIZE(codes); i++)
if (codes[i] == fmt->format.code)
break;
if (i >= ARRAY_SIZE(codes))
i = 0;
if (fmt->pad >= NUM_PADS)
return -EINVAL;

/* Bayer order varies with flips */
fmt->format.code = imx219_get_format_code(imx219, codes[i]);
mutex_lock(&imx219->mutex);

mode = v4l2_find_nearest_size(supported_modes,
ARRAY_SIZE(supported_modes),
width, height,
fmt->format.width, fmt->format.height);
imx219_update_pad_format(imx219, mode, fmt);
if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
framefmt = v4l2_subdev_get_try_format(sd, sd_state, fmt->pad);
*framefmt = fmt->format;
} else if (imx219->mode != mode ||
imx219->fmt.code != fmt->format.code) {
u32 prev_hts = imx219->mode->width + imx219->hblank->val;

imx219->fmt = fmt->format;
imx219->mode = mode;
/* Update limits and set FPS to default */
__v4l2_ctrl_modify_range(imx219->vblank, IMX219_VBLANK_MIN,
IMX219_VTS_MAX - mode->height, 1,
mode->vts_def - mode->height);
__v4l2_ctrl_s_ctrl(imx219->vblank,
mode->vts_def - mode->height);
/* Update max exposure while meeting expected vblanking */
exposure_max = mode->vts_def - 4;
exposure_def = (exposure_max < IMX219_EXPOSURE_DEFAULT) ?
exposure_max : IMX219_EXPOSURE_DEFAULT;
__v4l2_ctrl_modify_range(imx219->exposure,
imx219->exposure->minimum,
exposure_max, imx219->exposure->step,
exposure_def);
/*
* Retain PPL setting from previous mode so that the
* line time does not change on a mode change.
* Limits have to be recomputed as the controls define
* the blanking only, so PPL values need to have the
* mode width subtracted.
*/
hblank = prev_hts - mode->width;
__v4l2_ctrl_modify_range(imx219->hblank,
IMX219_PPL_MIN - mode->width,
IMX219_PPL_MAX - mode->width,
1,
IMX219_PPL_MIN - mode->width);
__v4l2_ctrl_s_ctrl(imx219->hblank, hblank);
if (fmt->pad == IMAGE_PAD) {
for (i = 0; i < ARRAY_SIZE(codes); i++)
if (codes[i] == fmt->format.code)
break;
if (i >= ARRAY_SIZE(codes))
i = 0;

/* Bayer order varies with flips */
fmt->format.code = imx219_get_format_code(imx219, codes[i]);

mode = v4l2_find_nearest_size(supported_modes,
ARRAY_SIZE(supported_modes),
width, height,
fmt->format.width,
fmt->format.height);
imx219_update_image_pad_format(imx219, mode, fmt);
if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
framefmt = v4l2_subdev_get_try_format(sd, sd_state,
fmt->pad);
*framefmt = fmt->format;
} else if (imx219->mode != mode ||
imx219->fmt.code != fmt->format.code) {
u32 prev_hts = imx219->mode->width + imx219->hblank->val;

imx219->fmt = fmt->format;
imx219->mode = mode;
/* Update limits and set FPS to default */
__v4l2_ctrl_modify_range(imx219->vblank,
IMX219_VBLANK_MIN,
IMX219_VTS_MAX - mode->height,
1,
mode->vts_def - mode->height);
__v4l2_ctrl_s_ctrl(imx219->vblank,
mode->vts_def - mode->height);
/* Update max exposure while meeting expected vblanking */
exposure_max = mode->vts_def - 4;
exposure_def = (exposure_max < IMX219_EXPOSURE_DEFAULT) ?
exposure_max : IMX219_EXPOSURE_DEFAULT;
__v4l2_ctrl_modify_range(imx219->exposure,
imx219->exposure->minimum,
exposure_max,
imx219->exposure->step,
exposure_def);
/*
* Retain PPL setting from previous mode so that the
* line time does not change on a mode change.
* Limits have to be recomputed as the controls define
* the blanking only, so PPL values need to have the
* mode width subtracted.
*/
hblank = prev_hts - mode->width;
__v4l2_ctrl_modify_range(imx219->hblank,
IMX219_PPL_MIN - mode->width,
IMX219_PPL_MAX - mode->width,
1,
IMX219_PPL_MIN - mode->width);
__v4l2_ctrl_s_ctrl(imx219->hblank, hblank);
}
} else {
if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
framefmt = v4l2_subdev_get_try_format(sd, sd_state,
fmt->pad);
*framefmt = fmt->format;
} else {
/* Only one embedded data mode is supported */
imx219_update_metadata_pad_format(fmt);
}
}

mutex_unlock(&imx219->mutex);
Expand Down Expand Up @@ -1490,12 +1568,13 @@ static int imx219_probe(struct i2c_client *client)
imx219->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;

/* Initialize source pad */
imx219->pad.flags = MEDIA_PAD_FL_SOURCE;
imx219->pad[IMAGE_PAD].flags = MEDIA_PAD_FL_SOURCE;
imx219->pad[METADATA_PAD].flags = MEDIA_PAD_FL_SOURCE;

/* Initialize default format */
imx219_set_default_format(imx219);

ret = media_entity_pads_init(&imx219->sd.entity, 1, &imx219->pad);
ret = media_entity_pads_init(&imx219->sd.entity, NUM_PADS, imx219->pad);
if (ret) {
dev_err(dev, "failed to init entity pads: %d\n", ret);
goto error_handler_free;
Expand Down

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