[PATCH v2] media: i2c: imx219: implement v4l2 selection api
From: Vinay Varma
Date: Mon Jan 08 2024 - 22:51:28 EST
This patch exposes the hw's crop and compose capabilities by implementing
the selection API. Horizontal and vertical binning being separate
registers `imx219_binning_goodness` computes the best possible height
and width of the compose specification using the selection flags. Compose
operation updates the subdev's format object to keep them in sync.
Signed-off-by: Vinay Varma <varmavinaym@xxxxxxxxx>
---
Changes since v1:
- Rebase on media-master; fix conflicts
- Rewrap commit message to 75 chars
- Fix alignment of a constant
- Remove unnecessary braces
- Reverse christmas tree ordering of variables in new functions
---
drivers/media/i2c/imx219.c | 223 +++++++++++++++++++++++++++++++------
1 file changed, 191 insertions(+), 32 deletions(-)
diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
index e17ef2e9d9d0..8a5fee27af45 100644
--- a/drivers/media/i2c/imx219.c
+++ b/drivers/media/i2c/imx219.c
@@ -29,6 +29,7 @@
#include <media/v4l2-event.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-mediabus.h>
+#include <media/v4l2-rect.h>
/* Chip ID */
#define IMX219_REG_CHIP_ID CCI_REG16(0x0000)
@@ -73,6 +74,7 @@
/* V_TIMING internal */
#define IMX219_REG_VTS CCI_REG16(0x0160)
#define IMX219_VTS_MAX 0xffff
+#define IMX219_VTS_DEF 1763
#define IMX219_VBLANK_MIN 4
@@ -146,6 +148,7 @@
#define IMX219_PIXEL_ARRAY_TOP 8U
#define IMX219_PIXEL_ARRAY_WIDTH 3280U
#define IMX219_PIXEL_ARRAY_HEIGHT 2464U
+#define IMX219_MIN_COMPOSE_SIZE 8U
/* Mode : resolution and related config&values */
struct imx219_mode {
@@ -284,6 +287,8 @@ static const u32 imx219_mbus_formats[] = {
#define IMX219_XCLR_MIN_DELAY_US 6200
#define IMX219_XCLR_DELAY_RANGE_US 1000
+static const u32 binning_ratios[] = { 1, 2 };
+
/* Mode configs */
static const struct imx219_mode supported_modes[] = {
{
@@ -296,19 +301,19 @@ static const struct imx219_mode supported_modes[] = {
/* 1080P 30fps cropped */
.width = 1920,
.height = 1080,
- .vts_def = 1763,
+ .vts_def = IMX219_VTS_DEF,
},
{
/* 2x2 binned 30fps mode */
.width = 1640,
.height = 1232,
- .vts_def = 1763,
+ .vts_def = IMX219_VTS_DEF,
},
{
/* 640x480 30fps mode */
.width = 640,
.height = 480,
- .vts_def = 1763,
+ .vts_def = IMX219_VTS_DEF,
},
};
@@ -809,6 +814,38 @@ static int imx219_enum_frame_size(struct v4l2_subdev *sd,
return 0;
}
+static void imx219_refresh_ctrls(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *state,
+ unsigned int vts_def)
+{
+ struct v4l2_mbus_framefmt *fmt = v4l2_subdev_state_get_format(state, 0);
+ struct imx219 *imx219 = to_imx219(sd);
+ int exposure_max;
+ int exposure_def;
+ int hblank;
+
+ /* Update limits and set FPS to default */
+ __v4l2_ctrl_modify_range(imx219->vblank, IMX219_VBLANK_MIN,
+ IMX219_VTS_MAX - fmt->height, 1,
+ vts_def - fmt->height);
+ __v4l2_ctrl_s_ctrl(imx219->vblank, vts_def - fmt->height);
+ /* Update max exposure while meeting expected vblanking */
+ exposure_max = 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);
+ /*
+ * Currently PPL is fixed to IMX219_PPL_DEFAULT, so hblank
+ * depends on mode->width only, and is not changeble in any
+ * way other than changing the mode.
+ */
+ hblank = IMX219_PPL_DEFAULT - fmt->width;
+ __v4l2_ctrl_modify_range(imx219->hblank, hblank, hblank, 1, hblank);
+}
+
static int imx219_set_pad_format(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_format *fmt)
@@ -816,7 +853,7 @@ 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 *crop;
+ struct v4l2_rect *crop, *compose;
unsigned int bin_h, bin_v;
mode = v4l2_find_nearest_size(supported_modes,
@@ -842,34 +879,14 @@ static int imx219_set_pad_format(struct v4l2_subdev *sd,
crop->left = (IMX219_NATIVE_WIDTH - crop->width) / 2;
crop->top = (IMX219_NATIVE_HEIGHT - crop->height) / 2;
- if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
- int exposure_max;
- int exposure_def;
- int hblank;
-
- /* 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);
- /*
- * Currently PPL is fixed to IMX219_PPL_DEFAULT, so hblank
- * depends on mode->width only, and is not changeble in any
- * way other than changing the mode.
- */
- hblank = IMX219_PPL_DEFAULT - mode->width;
- __v4l2_ctrl_modify_range(imx219->hblank, hblank, hblank, 1,
- hblank);
- }
+ compose = v4l2_subdev_state_get_compose(state, 0);
+ compose->width = format->width;
+ compose->height = format->height;
+ compose->left = 0;
+ compose->top = 0;
+
+ if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+ imx219_refresh_ctrls(sd, state, mode->vts_def);
return 0;
}
@@ -884,6 +901,10 @@ static int imx219_get_selection(struct v4l2_subdev *sd,
return 0;
}
+ case V4L2_SEL_TGT_COMPOSE:
+ sel->r = *v4l2_subdev_state_get_compose(state, 0);
+ return 0;
+
case V4L2_SEL_TGT_NATIVE_SIZE:
sel->r.top = 0;
sel->r.left = 0;
@@ -900,11 +921,148 @@ static int imx219_get_selection(struct v4l2_subdev *sd,
sel->r.height = IMX219_PIXEL_ARRAY_HEIGHT;
return 0;
+
+ case V4L2_SEL_TGT_COMPOSE_DEFAULT:
+ case V4L2_SEL_TGT_COMPOSE_BOUNDS:
+ case V4L2_SEL_TGT_COMPOSE_PADDED:
+ sel->r.top = 0;
+ sel->r.left = 0;
+ sel->r.width = IMX219_PIXEL_ARRAY_WIDTH;
+ sel->r.height = IMX219_PIXEL_ARRAY_HEIGHT;
+ return 0;
}
return -EINVAL;
}
+#define IMX219_ROUND(dim, step, flags) \
+ ((flags) & V4L2_SEL_FLAG_GE ? \
+ round_up((dim), (step)) : \
+ ((flags) & V4L2_SEL_FLAG_LE ? \
+ round_down((dim), (step)) : \
+ round_down((dim) + (step) / 2, (step))))
+
+static bool imx219_set_selection_crop(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_selection *sel)
+{
+ struct v4l2_rect *compose, *crop;
+ struct v4l2_mbus_framefmt *fmt;
+ u32 max_binning;
+
+ crop = v4l2_subdev_state_get_crop(sd_state, 0);
+ if (v4l2_rect_equal(&sel->r, crop))
+ return false;
+ max_binning = binning_ratios[ARRAY_SIZE(binning_ratios) - 1];
+ sel->r.width =
+ clamp(IMX219_ROUND(sel->r.width, max_binning, sel->flags),
+ max_binning * IMX219_MIN_COMPOSE_SIZE,
+ IMX219_PIXEL_ARRAY_WIDTH);
+ sel->r.height =
+ clamp(IMX219_ROUND(sel->r.width, max_binning, sel->flags),
+ max_binning * IMX219_MIN_COMPOSE_SIZE,
+ IMX219_PIXEL_ARRAY_WIDTH);
+ sel->r.left =
+ min_t(u32, sel->r.left, IMX219_PIXEL_ARRAY_LEFT - sel->r.width);
+ sel->r.top =
+ min_t(u32, sel->r.top, IMX219_PIXEL_ARRAY_TOP - sel->r.top);
+
+ compose = v4l2_subdev_state_get_compose(sd_state, 0);
+ fmt = v4l2_subdev_state_get_format(sd_state, 0);
+ *crop = sel->r;
+ compose->height = crop->height;
+ compose->width = crop->width;
+ return true;
+}
+
+static int imx219_binning_goodness(u32 act, u32 ask, u32 flags)
+{
+ const int goodness = 100000;
+ int val = 0;
+
+ if (flags & V4L2_SEL_FLAG_GE)
+ if (act < ask)
+ val -= goodness;
+
+ if (flags & V4L2_SEL_FLAG_LE)
+ if (act > ask)
+ val -= goodness;
+
+ val -= abs(act - ask);
+
+ return val;
+}
+
+static bool imx219_set_selection_compose(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *state,
+ struct v4l2_subdev_selection *sel)
+{
+ struct v4l2_rect *compose, *crop;
+ int best_goodness;
+
+ compose = v4l2_subdev_state_get_compose(state, 0);
+ if (v4l2_rect_equal(compose, &sel->r))
+ return false;
+
+ crop = v4l2_subdev_state_get_crop(state, 0);
+ best_goodness = INT_MIN;
+ for (int i = 0; i < ARRAY_SIZE(binning_ratios); ++i) {
+ u32 width = crop->width / binning_ratios[i];
+ int goodness = imx219_binning_goodness(width, sel->r.width,
+ sel->flags);
+
+ if (goodness > best_goodness) {
+ best_goodness = goodness;
+ compose->width = width;
+ }
+ }
+ best_goodness = INT_MIN;
+ for (int i = 0; i < ARRAY_SIZE(binning_ratios); ++i) {
+ u32 height = crop->height / binning_ratios[i];
+ int goodness = imx219_binning_goodness(height, sel->r.height,
+ sel->flags);
+
+ if (goodness > best_goodness) {
+ best_goodness = goodness;
+ compose->height = height;
+ }
+ }
+ sel->r = *compose;
+ return true;
+}
+
+static int imx219_set_selection(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_selection *sel)
+{
+ bool compose_updated = false;
+
+ switch (sel->target) {
+ case V4L2_SEL_TGT_CROP:
+ compose_updated = imx219_set_selection_crop(sd, sd_state, sel);
+ break;
+ case V4L2_SEL_TGT_COMPOSE:
+ compose_updated =
+ imx219_set_selection_compose(sd, sd_state, sel);
+ break;
+ default:
+ return -EINVAL;
+ }
+ if (compose_updated) {
+ struct v4l2_rect *compose =
+ v4l2_subdev_state_get_compose(sd_state, 0);
+ struct v4l2_mbus_framefmt *fmt =
+ v4l2_subdev_state_get_format(sd_state, 0);
+
+ fmt->height = compose->height;
+ fmt->width = compose->width;
+ if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+ imx219_refresh_ctrls(sd, sd_state, IMX219_VTS_DEF);
+ }
+
+ return 0;
+}
+
static int imx219_init_state(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state)
{
@@ -937,6 +1095,7 @@ static const struct v4l2_subdev_pad_ops imx219_pad_ops = {
.get_fmt = v4l2_subdev_get_fmt,
.set_fmt = imx219_set_pad_format,
.get_selection = imx219_get_selection,
+ .set_selection = imx219_set_selection,
.enum_frame_size = imx219_enum_frame_size,
};
--
2.43.0