Hi Laurent
On Fri, Mar 01, 2024 at 11:32:17PM +0200, Laurent Pinchart wrote:
> Use the newly added internal pad API to expose the internal
> configuration of the sensor to userspace in a standard manner. This also
> paves the way for adding support for embedded data with an additional
> internal pad.
>
> To maintain compatibility with existing userspace that may operate on
> pad 0 unconditionally, keep the source pad numbered 0 and number the
> internal image pad 1.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
> drivers/media/i2c/imx219.c | 169 +++++++++++++++++++++++++++++--------
> 1 file changed, 133 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
> index 3878da50860e..817bf192e4d9 100644
> --- a/drivers/media/i2c/imx219.c
> +++ b/drivers/media/i2c/imx219.c
> @@ -140,6 +140,7 @@
> #define IMX219_DEFAULT_LINK_FREQ_4LANE 363000000
>
> /* IMX219 native and active pixel array size. */
> +#define IMX219_NATIVE_FORMAT MEDIA_BUS_FMT_SRGGB10_1X10
> #define IMX219_NATIVE_WIDTH 3296U
> #define IMX219_NATIVE_HEIGHT 2480U
> #define IMX219_PIXEL_ARRAY_LEFT 8U
> @@ -312,9 +313,15 @@ static const struct imx219_mode supported_modes[] = {
> },
> };
>
> +enum imx219_pad_ids {
> + IMX219_PAD_SOURCE,
> + IMX219_PAD_IMAGE,
Feels a bit weird for the internal source pad to be named "Image" as
it will (if I understand correctly) host both the image and metadata
streams.
However, I have an hard time proposing a different name, but we should
find something that should be used in all drivers ported to this new
API.
Enough with bikeshedding anyway, this is a tiny detail.
> + IMX219_NUM_PADS,
> +};
> +
> struct imx219 {
> struct v4l2_subdev sd;
> - struct media_pad pad;
> + struct media_pad pads[IMX219_NUM_PADS];
>
> struct regmap *regmap;
> struct clk *xclk; /* system clock to IMX219 */
> @@ -374,7 +381,7 @@ static int imx219_set_ctrl(struct v4l2_ctrl *ctrl)
> int ret = 0;
>
> state = v4l2_subdev_get_locked_active_state(&imx219->sd);
> - format = v4l2_subdev_state_get_format(state, 0);
> + format = v4l2_subdev_state_get_format(state, IMX219_PAD_SOURCE);
>
> if (ctrl->id == V4L2_CID_VBLANK) {
> int exposure_max, exposure_def;
> @@ -593,8 +600,8 @@ static int imx219_set_framefmt(struct imx219 *imx219,
> u64 bin_h, bin_v;
> int ret = 0;
>
> - format = v4l2_subdev_state_get_format(state, 0);
> - crop = v4l2_subdev_state_get_crop(state, 0);
> + format = v4l2_subdev_state_get_format(state, IMX219_PAD_SOURCE);
> + crop = v4l2_subdev_state_get_crop(state, IMX219_PAD_IMAGE);
>
> switch (format->code) {
> case MEDIA_BUS_FMT_SRGGB8_1X8:
> @@ -764,10 +771,25 @@ static int imx219_enum_mbus_code(struct v4l2_subdev *sd,
> {
> struct imx219 *imx219 = to_imx219(sd);
>
> - if (code->index >= (ARRAY_SIZE(imx219_mbus_formats) / 4))
> - return -EINVAL;
> + if (code->pad == IMX219_PAD_IMAGE) {
> + /* The internal image pad is hardwired to the native format. */
> + if (code->index)
> + return -EINVAL;
>
> - code->code = imx219_get_format_code(imx219, imx219_mbus_formats[code->index * 4]);
> + code->code = IMX219_NATIVE_FORMAT;
If you return 0 here you can spare the else {} branch. Same in the
function below.
> + } else {
> + /*
> + * On the source pad, the sensor supports multiple raw formats
> + * with different bit depths.
> + */
> + u32 format;
> +
> + if (code->index >= (ARRAY_SIZE(imx219_mbus_formats) / 4))
> + return -EINVAL;
> +
> + format = imx219_mbus_formats[code->index * 4];
> + code->code = imx219_get_format_code(imx219, format);
> + }
>
> return 0;
> }
> @@ -777,19 +799,25 @@ static int imx219_enum_frame_size(struct v4l2_subdev *sd,
> struct v4l2_subdev_frame_size_enum *fse)
> {
> struct imx219 *imx219 = to_imx219(sd);
> - u32 code;
>
> - if (fse->index >= ARRAY_SIZE(supported_modes))
> - return -EINVAL;
> + if (fse->pad == IMX219_PAD_IMAGE) {
> + if (fse->code != IMX219_NATIVE_FORMAT || fse->index > 0)
> + return -EINVAL;
>
> - code = imx219_get_format_code(imx219, fse->code);
> - if (fse->code != code)
> - return -EINVAL;
> + fse->min_width = IMX219_NATIVE_WIDTH;
> + fse->max_width = IMX219_NATIVE_WIDTH;
> + fse->min_height = IMX219_NATIVE_HEIGHT;
> + fse->max_height = IMX219_NATIVE_HEIGHT;
> + } else {
> + if (fse->code != imx219_get_format_code(imx219, fse->code) ||
> + fse->index >= ARRAY_SIZE(supported_modes))
> + 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 = 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;
> + }
>
> return 0;
> }
> @@ -801,9 +829,17 @@ static int imx219_set_pad_format(struct v4l2_subdev *sd,
> struct imx219 *imx219 = to_imx219(sd);
> const struct imx219_mode *mode;
> struct v4l2_mbus_framefmt *format;
> + struct v4l2_rect *compose;
> struct v4l2_rect *crop;
> unsigned int bin_h, bin_v;
>
> + /*
> + * The driver is mode-based, the format can be set on the source pad
> + * only.
> + */
> + if (fmt->pad != IMX219_PAD_SOURCE)
> + return v4l2_subdev_get_fmt(sd, state, fmt);
> +
> /*
> * Adjust the requested format to match the closest mode. The Bayer
> * order varies with flips.
> @@ -822,22 +858,51 @@ static int imx219_set_pad_format(struct v4l2_subdev *sd,
> fmt->format.quantization = V4L2_QUANTIZATION_FULL_RANGE;
> fmt->format.xfer_func = V4L2_XFER_FUNC_NONE;
>
> - format = v4l2_subdev_state_get_format(state, 0);
> + /* Propagate the format through the sensor. */
> +
> + /* The image pad models the pixel array, and thus has a fixed size. */
> + format = v4l2_subdev_state_get_format(state, IMX219_PAD_IMAGE);
> *format = fmt->format;
Is this assignment needed ?
Isn't 'fmt' meant to be applied at pad #0 ? Also, you overwrite the
code and size below, do the rest of the 'struct v4l2_mbus_framefmt'
fields apply to pad #1 (field, colorspace, quantization etc ? If pad
#1 represents the pixel array, I don't think they do).
Also, can't the pad #1 format be initialized by .init_state() and never
touched again ?
> + format->code = IMX219_NATIVE_FORMAT;
> + format->width = IMX219_NATIVE_WIDTH;
> + format->height = IMX219_NATIVE_HEIGHT;
>
> /*
> * Use binning to maximize the crop rectangle size, and centre it in the
> * sensor.
> */
> - bin_h = min(IMX219_PIXEL_ARRAY_WIDTH / format->width, 2U);
> - bin_v = min(IMX219_PIXEL_ARRAY_HEIGHT / format->height, 2U);
> + bin_h = min(IMX219_PIXEL_ARRAY_WIDTH / fmt->format.width, 2U);
> + bin_v = min(IMX219_PIXEL_ARRAY_HEIGHT / fmt->format.height, 2U);
>
> - crop = v4l2_subdev_state_get_crop(state, 0);
> - crop->width = format->width * bin_h;
> - crop->height = format->height * bin_v;
> + crop = v4l2_subdev_state_get_crop(state, IMX219_PAD_IMAGE);
> + crop->width = fmt->format.width * bin_h;
> + crop->height = fmt->format.height * bin_v;
> crop->left = (IMX219_NATIVE_WIDTH - crop->width) / 2;
> crop->top = (IMX219_NATIVE_HEIGHT - crop->height) / 2;
This is no different than before, but I now wonder if VGA is actually
obtained by cropping down to 1280x960 and then by a 2x2 binning, or is
there a 4x4 binning mode. I presume this is correct though, as this has been
validated by many people.
>
> + /*
> + * The compose rectangle models binning, its size is the sensor output
> + * size.
> + */
> + compose = v4l2_subdev_state_get_compose(state, IMX219_PAD_IMAGE);
> + compose->left = 0;
> + compose->top = 0;
> + compose->width = fmt->format.width;
> + compose->height = fmt->format.height;
> +
> + /*
> + * No mode use digital crop, the source pad crop rectangle size and
> + * format are thus identical to the image pad compose rectangle.
> + */
> + crop = v4l2_subdev_state_get_crop(state, IMX219_PAD_SOURCE);
> + crop->left = 0;
> + crop->top = 0;
> + crop->width = fmt->format.width;
> + crop->height = fmt->format.height;
> +
> + format = v4l2_subdev_state_get_format(state, IMX219_PAD_SOURCE);
> + *format = fmt->format;
> +
> if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
> int exposure_max;
> int exposure_def;
> @@ -874,13 +939,13 @@ static int imx219_get_selection(struct v4l2_subdev *sd,
> struct v4l2_subdev_state *state,
> struct v4l2_subdev_selection *sel)
> {
> - switch (sel->target) {
> - case V4L2_SEL_TGT_CROP: {
> - sel->r = *v4l2_subdev_state_get_crop(state, 0);
> - return 0;
> - }
> + struct v4l2_rect *compose;
>
> + switch (sel->target) {
> case V4L2_SEL_TGT_NATIVE_SIZE:
> + if (sel->pad != IMX219_PAD_IMAGE)
> + return -EINVAL;
> +
> sel->r.top = 0;
> sel->r.left = 0;
> sel->r.width = IMX219_NATIVE_WIDTH;
> @@ -890,11 +955,35 @@ static int imx219_get_selection(struct v4l2_subdev *sd,
>
> case V4L2_SEL_TGT_CROP_DEFAULT:
> case V4L2_SEL_TGT_CROP_BOUNDS:
> - sel->r.top = IMX219_PIXEL_ARRAY_TOP;
> - sel->r.left = IMX219_PIXEL_ARRAY_LEFT;
> - sel->r.width = IMX219_PIXEL_ARRAY_WIDTH;
> - sel->r.height = IMX219_PIXEL_ARRAY_HEIGHT;
> + switch (sel->pad) {
> + case IMX219_PAD_IMAGE:
> + sel->r.top = IMX219_PIXEL_ARRAY_TOP;
> + sel->r.left = IMX219_PIXEL_ARRAY_LEFT;
> + sel->r.width = IMX219_PIXEL_ARRAY_WIDTH;
> + sel->r.height = IMX219_PIXEL_ARRAY_HEIGHT;
> + return 0;
>
> + case IMX219_PAD_SOURCE:
> + compose = v4l2_subdev_state_get_compose(state,
> + IMX219_PAD_IMAGE);
> + sel->r.top = 0;
> + sel->r.left = 0;
> + sel->r.width = compose->width;
> + sel->r.height = compose->height;
> + return 0;
> + }
> +
> + break;
> +
> + case V4L2_SEL_TGT_CROP:
> + sel->r = *v4l2_subdev_state_get_crop(state, sel->pad);
> + return 0;
> +
> + case V4L2_SEL_TGT_COMPOSE:
> + if (sel->pad != IMX219_PAD_IMAGE)
> + return -EINVAL;
> +
> + sel->r = *v4l2_subdev_state_get_compose(state, sel->pad);
> return 0;
Do we need to support TGT_COMPOSE_BOUNDS for PAD_IMAGE ? I would have
suggested V4L2_SEL_TGT_COMPOSE_DEFAULT too, but according to the spec
it does not apply to subdevices.
> }
>
> @@ -906,7 +995,7 @@ static int imx219_init_state(struct v4l2_subdev *sd,
> {
> struct v4l2_subdev_format fmt = {
> .which = V4L2_SUBDEV_FORMAT_TRY,
> - .pad = 0,
> + .pad = IMX219_PAD_SOURCE,
> .format = {
> .code = MEDIA_BUS_FMT_SRGGB10_1X10,
> .width = supported_modes[0].width,
Why not intialize pad#1 format here an never touch it again ? Should
also the pad#1 crop and compose rectangles and pad#0 crop be
initialized here ?
> @@ -1174,10 +1263,18 @@ static int imx219_probe(struct i2c_client *client)
> V4L2_SUBDEV_FL_HAS_EVENTS;
> imx219->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
>
> - /* Initialize source pad */
> - imx219->pad.flags = MEDIA_PAD_FL_SOURCE;
> + /*
> + * Initialize the pads. To preserve backward compatibility with
> + * userspace that used the sensor before the introduction of the
> + * internal image pad, the external source pad is numbered 0 and the
> + * internal image pad numbered 1.
> + */
> + imx219->pads[IMX219_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
> + imx219->pads[IMX219_PAD_IMAGE].flags = MEDIA_PAD_FL_SINK
> + | MEDIA_PAD_FL_INTERNAL;
>
> - ret = media_entity_pads_init(&imx219->sd.entity, 1, &imx219->pad);
> + ret = media_entity_pads_init(&imx219->sd.entity,
> + ARRAY_SIZE(imx219->pads), imx219->pads);
> if (ret) {
> dev_err(dev, "failed to init entity pads: %d\n", ret);
> goto error_handler_free;
> --
> Regards,
>
> Laurent Pinchart
>
>
