The crop rectangle takes the preview engine internal cropping
requirements into account. The smallest allowable margins are 14 columns
and 8 rows when reading from memory, and 18 columns and 8 rows when
processing data on the fly from the CCDC.
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/media/video/omap3isp/isppreview.c | 262 +++++++++++++++++++++-------
drivers/media/video/omap3isp/isppreview.h | 2 +
2 files changed, 198 insertions(+), 66 deletions(-)
diff --git a/drivers/media/video/omap3isp/isppreview.c b/drivers/media/video/omap3isp/isppreview.c
index d5cce42..ccb876f 100644
--- a/drivers/media/video/omap3isp/isppreview.c
+++ b/drivers/media/video/omap3isp/isppreview.c
@@ -76,6 +76,42 @@ static struct omap3isp_prev_csc flr_prev_csc = {
#define DEF_DETECT_CORRECT_VAL 0xe
+/*
+ * Margins and image size limits.
+ *
+ * The preview engine crops several rows and columns internally depending on
+ * which filters are enabled. To avoid format changes when the filters are
+ * enabled or disabled (which would prevent them from being turned on or off
+ * during streaming), the driver assumes all the filters are enabled when
+ * computing sink crop and source format limits.
+ *
+ * If a filter is disabled, additional cropping is automatically added at the
+ * preview engine input by the driver to avoid overflow at line and frame end.
+ * This is completely transparent for applications.
+ *
+ * Median filter 4 pixels
+ * Noise filter,
+ * Faulty pixels correction 4 pixels, 4 lines
+ * CFA filter 4 pixels, 4 lines in Bayer mode
+ * 2 lines in other modes
+ * Color suppression 2 pixels
+ * or luma enhancement
+ * -------------------------------------------------------------
+ * Maximum total 14 pixels, 8 lines
+ *
+ * The color suppression and luma enhancement filters are applied after bayer to
+ * YUV conversion. They thus can crop one pixel on the left and one pixel on the
+ * right side of the image without changing the color pattern. When both those
+ * filters are disabled, the driver must crop the two pixels on the same side of
+ * the image to avoid changing the bayer pattern. The left margin is thus set to
+ * 8 pixels and the right margin to 6 pixels.
+ */
+
+#define PREV_MARGIN_LEFT 8
+#define PREV_MARGIN_RIGHT 6
+#define PREV_MARGIN_TOP 4
+#define PREV_MARGIN_BOTTOM 4
+
#define PREV_MIN_IN_WIDTH 64
#define PREV_MIN_IN_HEIGHT 8
#define PREV_MAX_IN_HEIGHT 16384
@@ -985,52 +1021,36 @@ static void preview_config_averager(struct isp_prev_device *prev, u8 average)
* enabled when reporting source pad formats to userspace. If this assumption is
* not true, rows and columns must be manually cropped at the preview engine
* input to avoid overflows at the end of lines and frames.
+ *
+ * See the explanation at the PREV_MARGIN_* definitions for more details.
*/
static void preview_config_input_size(struct isp_prev_device *prev)
{
struct isp_device *isp = to_isp_device(prev);
struct prev_params *params = &prev->params;
- struct v4l2_mbus_framefmt *format = &prev->formats[PREV_PAD_SINK];
- unsigned int sph = 0;
- unsigned int eph = format->width - 1;
- unsigned int slv = 0;
- unsigned int elv = format->height - 1;
-
- if (prev->input == PREVIEW_INPUT_CCDC) {
- sph += 2;
- eph -= 2;
- }
-
- /*
- * Median filter 4 pixels
- * Noise filter 4 pixels, 4 lines
- * or faulty pixels correction
- * CFA filter 4 pixels, 4 lines in Bayer mode
- * 2 lines in other modes
- * Color suppression 2 pixels
- * or luma enhancement
- * -------------------------------------------------------------
- * Maximum total 14 pixels, 8 lines
- */
-
- if (!(params->features & PREV_CFA)) {
- sph += 2;
- eph -= 2;
- slv += 2;
- elv -= 2;
+ unsigned int sph = prev->crop.left;
+ unsigned int eph = prev->crop.left + prev->crop.width - 1;
+ unsigned int slv = prev->crop.top;
+ unsigned int elv = prev->crop.top + prev->crop.height - 1;
+
+ if (params->features & PREV_CFA) {
+ sph -= 2;
+ eph += 2;
+ slv -= 2;
+ elv += 2;
}
- if (!(params->features & (PREV_DEFECT_COR | PREV_NOISE_FILTER))) {
- sph += 2;
- eph -= 2;
- slv += 2;
- elv -= 2;
+ if (params->features & (PREV_DEFECT_COR | PREV_NOISE_FILTER)) {
+ sph -= 2;
+ eph += 2;
+ slv -= 2;
+ elv += 2;
}
- if (!(params->features & PREV_HORZ_MEDIAN_FILTER)) {
- sph += 2;
- eph -= 2;
+ if (params->features & PREV_HORZ_MEDIAN_FILTER) {
+ sph -= 2;
+ eph += 2;
}
- if (!(params->features & (PREV_CHROMA_SUPPRESS | PREV_LUMA_ENHANCE)))
- sph += 2;
+ if (params->features & (PREV_CHROMA_SUPPRESS | PREV_LUMA_ENHANCE))
+ sph -= 2;
isp_reg_writel(isp, (sph << ISPPRV_HORZ_INFO_SPH_SHIFT) | eph,
OMAP3_ISP_IOMEM_PREV, ISPPRV_HORZ_INFO);
@@ -1597,6 +1617,16 @@ __preview_get_format(struct isp_prev_device *prev, struct v4l2_subdev_fh *fh,
return &prev->formats[pad];
}
+static struct v4l2_rect *
+__preview_get_crop(struct isp_prev_device *prev, struct v4l2_subdev_fh *fh,
+ enum v4l2_subdev_format_whence which)
+{
+ if (which == V4L2_SUBDEV_FORMAT_TRY)
+ return v4l2_subdev_get_try_crop(fh, PREV_PAD_SINK);
+ else
+ return &prev->crop;
+}
+
/* previewer format descriptions */
static const unsigned int preview_input_fmts[] = {
V4L2_MBUS_FMT_SGRBG10_1X10,
@@ -1611,19 +1641,23 @@ static const unsigned int preview_output_fmts[] = {
};
/*
- * preview_try_format - Handle try format by pad subdev method
- * @prev: ISP preview device
- * @fh : V4L2 subdev file handle
- * @pad: pad num
- * @fmt: pointer to v4l2 format structure
+ * preview_try_format - Validate a format
+ * @prev: ISP preview engine
+ * @fh: V4L2 subdev file handle
+ * @pad: pad number
+ * @fmt: format to be validated
+ * @which: try/active format selector
+ *
+ * Validate and adjust the given format for the given pad based on the preview
+ * engine limits and the format and crop rectangles on other pads.
*/
static void preview_try_format(struct isp_prev_device *prev,
struct v4l2_subdev_fh *fh, unsigned int pad,
struct v4l2_mbus_framefmt *fmt,
enum v4l2_subdev_format_whence which)
{
- struct v4l2_mbus_framefmt *format;
enum v4l2_mbus_pixelcode pixelcode;
+ struct v4l2_rect *crop;
unsigned int i;
switch (pad) {
@@ -1659,15 +1693,8 @@ static void preview_try_format(struct isp_prev_device *prev,
case PREV_PAD_SOURCE:
pixelcode = fmt->code;
- format = __preview_get_format(prev, fh, PREV_PAD_SINK, which);
- memcpy(fmt, format, sizeof(*fmt));
+ *fmt = *__preview_get_format(prev, fh, PREV_PAD_SINK, which);
- /* The preview module output size is configurable through the
- * input interface (horizontal and vertical cropping) and the
- * averager (horizontal scaling by 1/1, 1/2, 1/4 or 1/8). In
- * spite of this, hardcode the output size to the biggest
- * possible value for simplicity reasons.
- */
switch (pixelcode) {
case V4L2_MBUS_FMT_YUYV8_1X16:
case V4L2_MBUS_FMT_UYVY8_1X16:
@@ -1679,20 +1706,14 @@ static void preview_try_format(struct isp_prev_device *prev,
break;
}
- /* The TRM states (12.1.4.7.1.2) that 2 pixels must be cropped
- * from the left and right sides when the input source is the
- * CCDC. This seems not to be needed in practice, investigation
- * is required.
- */
- if (prev->input == PREVIEW_INPUT_CCDC)
- fmt->width -= 4;
-
- /* Assume that all blocks are enabled and crop pixels and lines
- * accordingly. See preview_config_input_size() for more
- * information.
+ /* The preview module output size is configurable through the
+ * averager (horizontal scaling by 1/1, 1/2, 1/4 or 1/8). This
+ * is not supported yet, hardcode the output size to the crop
+ * rectangle size.
*/
- fmt->width -= 14;
- fmt->height -= 8;
+ crop = __preview_get_crop(prev, fh, which);
+ fmt->width = crop->width;
+ fmt->height = crop->height;
fmt->colorspace = V4L2_COLORSPACE_JPEG;
break;
@@ -1702,6 +1723,49 @@ static void preview_try_format(struct isp_prev_device *prev,
}
/*
+ * preview_try_crop - Validate a crop rectangle
+ * @prev: ISP preview engine
+ * @sink: format on the sink pad
+ * @crop: crop rectangle to be validated
+ *
+ * The preview engine crops lines and columns for its internal operation,
+ * depending on which filters are enabled. Enforce minimum crop margins to
+ * handle that transparently for userspace.
+ *
+ * See the explanation at the PREV_MARGIN_* definitions for more details.
+ */
+static void preview_try_crop(struct isp_prev_device *prev,
+ const struct v4l2_mbus_framefmt *sink,
+ struct v4l2_rect *crop)
+{
+ unsigned int left = PREV_MARGIN_LEFT;
+ unsigned int right = sink->width - PREV_MARGIN_RIGHT;
+ unsigned int top = PREV_MARGIN_TOP;
+ unsigned int bottom = sink->height - PREV_MARGIN_BOTTOM;
+
+ /* When processing data on-the-fly from the CCDC, at least 2 pixels must
+ * be cropped from the left and right sides of the image. As we don't
+ * know which filters will be enabled, increase the left and right
+ * margins by two.
+ */
+ if (prev->input == PREVIEW_INPUT_CCDC) {
+ left += 2;
+ right -= 2;
+ }
+
+ /* Restrict left/top to even values to keep the Bayer pattern. */
+ crop->left &= ~1;
+ crop->top &= ~1;
+
+ crop->left = clamp_t(u32, crop->left, left, right - PREV_MIN_OUT_WIDTH);
+ crop->top = clamp_t(u32, crop->top, top, bottom - PREV_MIN_OUT_HEIGHT);
+ crop->width = clamp_t(u32, crop->width, PREV_MIN_OUT_WIDTH,
+ right - crop->left);
+ crop->height = clamp_t(u32, crop->height, PREV_MIN_OUT_HEIGHT,
+ bottom - crop->top);
+}
+
+/*
* preview_enum_mbus_code - Handle pixel format enumeration
* @sd : pointer to v4l2 subdev structure
* @fh : V4L2 subdev file handle
@@ -1763,6 +1827,60 @@ static int preview_enum_frame_size(struct v4l2_subdev *sd,
}
/*
+ * preview_get_crop - Retrieve the crop rectangle on a pad
+ * @sd: ISP preview V4L2 subdevice
+ * @fh: V4L2 subdev file handle
+ * @crop: crop rectangle
+ *
+ * Return 0 on success or a negative error code otherwise.
+ */
+static int preview_get_crop(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
+ struct v4l2_subdev_crop *crop)
+{
+ struct isp_prev_device *prev = v4l2_get_subdevdata(sd);
+
+ /* Cropping is only supported on the sink pad. */
+ if (crop->pad != PREV_PAD_SINK)
+ return -EINVAL;
+
+ crop->rect = *__preview_get_crop(prev, fh, crop->which);
+ return 0;
+}
+
+/*
+ * preview_set_crop - Retrieve the crop rectangle on a pad
+ * @sd: ISP preview V4L2 subdevice
+ * @fh: V4L2 subdev file handle
+ * @crop: crop rectangle
+ *
+ * Return 0 on success or a negative error code otherwise.
+ */
+static int preview_set_crop(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
+ struct v4l2_subdev_crop *crop)
+{
+ struct isp_prev_device *prev = v4l2_get_subdevdata(sd);
+ struct v4l2_mbus_framefmt *format;
+
+ /* Cropping is only supported on the sink pad. */
+ if (crop->pad != PREV_PAD_SINK)
+ return -EINVAL;
+
+ /* The crop rectangle can't be changed while streaming. */
+ if (prev->state != ISP_PIPELINE_STREAM_STOPPED)
+ return -EBUSY;
+
+ format = __preview_get_format(prev, fh, PREV_PAD_SINK, crop->which);
+ preview_try_crop(prev, format, &crop->rect);
+ *__preview_get_crop(prev, fh, crop->which) = crop->rect;
+
+ /* Update the source format. */
+ format = __preview_get_format(prev, fh, PREV_PAD_SOURCE, crop->which);
+ preview_try_format(prev, fh, PREV_PAD_SOURCE, format, crop->which);
+
+ return 0;
+}
+
+/*
* preview_get_format - Handle get format by pads subdev method
* @sd : pointer to v4l2 subdev structure
* @fh : V4L2 subdev file handle
@@ -1795,6 +1913,7 @@ static int preview_set_format(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
{
struct isp_prev_device *prev = v4l2_get_subdevdata(sd);
struct v4l2_mbus_framefmt *format;
+ struct v4l2_rect *crop;
format = __preview_get_format(prev, fh, fmt->pad, fmt->which);
if (format == NULL)
@@ -1805,9 +1924,18 @@ static int preview_set_format(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
/* Propagate the format from sink to source */
if (fmt->pad == PREV_PAD_SINK) {
+ /* Reset the crop rectangle. */
+ crop = __preview_get_crop(prev, fh, fmt->which);
+ crop->left = 0;
+ crop->top = 0;
+ crop->width = fmt->format.width;
+ crop->height = fmt->format.height;
+
+ preview_try_crop(prev, &fmt->format, crop);
+
+ /* Update the source format. */
format = __preview_get_format(prev, fh, PREV_PAD_SOURCE,
fmt->which);
- *format = fmt->format;
preview_try_format(prev, fh, PREV_PAD_SOURCE, format,
fmt->which);
}
@@ -1856,6 +1984,8 @@ static const struct v4l2_subdev_pad_ops preview_v4l2_pad_ops = {
.enum_frame_size = preview_enum_frame_size,
.get_fmt = preview_get_format,
.set_fmt = preview_set_format,
+ .get_crop = preview_get_crop,
+ .set_crop = preview_set_crop,
};
/* subdev operations */
diff --git a/drivers/media/video/omap3isp/isppreview.h b/drivers/media/video/omap3isp/isppreview.h
index 272a44a..f54e775 100644
--- a/drivers/media/video/omap3isp/isppreview.h
+++ b/drivers/media/video/omap3isp/isppreview.h
@@ -152,6 +152,7 @@ struct isptables_update {
* @subdev: V4L2 subdevice
* @pads: Media entity pads
* @formats: Active formats at the subdev pad
+ * @crop: Active crop rectangle
* @input: Module currently connected to the input pad
* @output: Bitmask of the active output
* @video_in: Input video entity
@@ -170,6 +171,7 @@ struct isp_prev_device {
struct v4l2_subdev subdev;
struct media_pad pads[PREV_PADS_NUM];
struct v4l2_mbus_framefmt formats[PREV_PADS_NUM];
+ struct v4l2_rect crop;
struct v4l2_ctrl_handler ctrls;
--
1.7.3.4
--
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