Several functions in the sh_mobile_ceu_camera driver implement generic
algorithms and can be re-used by other V4L2 camera host drivers too. These
functions attempt to optimise scaling and cropping functions of the
subdevice, e.g. a camera sensor. This patch makes those functions generic
for future re-use by other camera host drivers.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
---
.../platform/soc_camera/sh_mobile_ceu_camera.c | 130 +++++++++++---------
1 files changed, 71 insertions(+), 59 deletions(-)
diff --git a/drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c b/drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c
index 99d9029..4de3e7f 100644
--- a/drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c
+++ b/drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c
@@ -1005,7 +1005,7 @@ static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
fmt->packing == SOC_MBUS_PACKING_EXTEND16);
}
-static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
+static int soc_camera_client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
static struct soc_camera_device *ctrl_to_icd(struct v4l2_ctrl *ctrl)
{
@@ -1084,7 +1084,7 @@ static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int
/* FIXME: subwindow is lost between close / open */
/* Cache current client geometry */
- ret = client_g_rect(sd, &rect);
+ ret = soc_camera_client_g_rect(sd, &rect);
if (ret < 0)
return ret;
@@ -1208,18 +1208,23 @@ static bool is_inside(const struct v4l2_rect *r1, const struct v4l2_rect *r2)
r1->top + r1->height < r2->top + r2->height;
}
-static unsigned int scale_down(unsigned int size, unsigned int scale)
+static unsigned int soc_camera_shift_scale(unsigned int size, unsigned int shift,
+ unsigned int scale)
{
- return (size * 4096 + scale / 2) / scale;
+ return ((size << shift) + scale / 2) / scale;
}
-static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
+static unsigned int soc_camera_calc_scale(unsigned int input, unsigned int shift,
+ unsigned int output)
{
- return (input * 4096 + output / 2) / output;
+ return soc_camera_shift_scale(input, shift, output);
}
+#define scale_down(size, scale) soc_camera_shift_scale(size, 12, scale)
+#define calc_generic_scale(in, out) soc_camera_shift_scale(in, 12, out)
+
/* Get and store current client crop */
-static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
+static int soc_camera_client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
{
struct v4l2_crop crop;
struct v4l2_cropcap cap;
@@ -1244,10 +1249,8 @@ static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
}
/* Client crop has changed, update our sub-rectangle to remain within the area */
-static void update_subrect(struct sh_mobile_ceu_cam *cam)
+static void update_subrect(struct v4l2_rect *rect, struct v4l2_rect *subrect)
{
- struct v4l2_rect *rect = &cam->rect, *subrect = &cam->subrect;
-
if (rect->width < subrect->width)
subrect->width = rect->width;
@@ -1275,19 +1278,18 @@ static void update_subrect(struct sh_mobile_ceu_cam *cam)
* 2. if (1) failed, try to double the client image until we get one big enough
* 3. if (2) failed, try to request the maximum image
*/
-static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
- struct v4l2_crop *cam_crop)
+static int soc_camera_client_s_crop(struct v4l2_subdev *sd,
+ struct v4l2_crop *crop, struct v4l2_crop *cam_crop,
+ struct v4l2_rect *target_rect, struct v4l2_rect *subrect)
{
- struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
struct device *dev = sd->v4l2_dev->dev;
- struct sh_mobile_ceu_cam *cam = icd->host_priv;
struct v4l2_cropcap cap;
int ret;
unsigned int width, height;
v4l2_subdev_call(sd, video, s_crop, crop);
- ret = client_g_rect(sd, cam_rect);
+ ret = soc_camera_client_g_rect(sd, cam_rect);
if (ret < 0)
return ret;
@@ -1299,7 +1301,7 @@ static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
/* Even if camera S_CROP failed, but camera rectangle matches */
dev_dbg(dev, "Camera S_CROP successful for %dx%d@%d:%d\n",
rect->width, rect->height, rect->left, rect->top);
- cam->rect = *cam_rect;
+ *target_rect = *cam_rect;
return 0;
}
@@ -1365,7 +1367,7 @@ static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
cam_rect->top;
v4l2_subdev_call(sd, video, s_crop, cam_crop);
- ret = client_g_rect(sd, cam_rect);
+ ret = soc_camera_client_g_rect(sd, cam_rect);
dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret,
cam_rect->width, cam_rect->height,
cam_rect->left, cam_rect->top);
@@ -1379,15 +1381,15 @@ static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
*/
*cam_rect = cap.bounds;
v4l2_subdev_call(sd, video, s_crop, cam_crop);
- ret = client_g_rect(sd, cam_rect);
+ ret = soc_camera_client_g_rect(sd, cam_rect);
dev_geo(dev, "Camera S_CROP %d for max %dx%d@%d:%d\n", ret,
cam_rect->width, cam_rect->height,
cam_rect->left, cam_rect->top);
}
if (!ret) {
- cam->rect = *cam_rect;
- update_subrect(cam);
+ *target_rect = *cam_rect;
+ update_subrect(target_rect, subrect);
}
return ret;
@@ -1395,15 +1397,13 @@ static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
/* Iterative s_mbus_fmt, also updates cached client crop on success */
static int client_s_fmt(struct soc_camera_device *icd,
- struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
+ struct v4l2_rect *rect, struct v4l2_rect *subrect,
+ unsigned int max_width, unsigned int max_height,
+ struct v4l2_mbus_framefmt *mf, bool host_can_scale)
{
- struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
- struct sh_mobile_ceu_dev *pcdev = ici->priv;
- struct sh_mobile_ceu_cam *cam = icd->host_priv;
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
struct device *dev = icd->parent;
unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
- unsigned int max_width, max_height;
struct v4l2_cropcap cap;
bool ceu_1to1;
int ret;
@@ -1423,7 +1423,7 @@ static int client_s_fmt(struct soc_camera_device *icd,
}
ceu_1to1 = false;
- if (!ceu_can_scale)
+ if (!host_can_scale)
goto update_cache;
cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
@@ -1432,8 +1432,10 @@ static int client_s_fmt(struct soc_camera_device *icd,
if (ret < 0)
return ret;
- max_width = min(cap.bounds.width, pcdev->max_width);
- max_height = min(cap.bounds.height, pcdev->max_height);
+ if (max_width > cap.bounds.width)
+ max_width = cap.bounds.width;
+ if (max_height > cap.bounds.height)
+ max_height = cap.bounds.height;
/* Camera set a format, but geometry is not precise, try to improve */
tmp_w = mf->width;
@@ -1460,29 +1462,36 @@ static int client_s_fmt(struct soc_camera_device *icd,
update_cache:
/* Update cache */
- ret = client_g_rect(sd, &cam->rect);
+ ret = soc_camera_client_g_rect(sd, rect);
if (ret < 0)
return ret;
if (ceu_1to1)
- cam->subrect = cam->rect;
+ *subrect = *rect;
else
- update_subrect(cam);
+ update_subrect(rect, subrect);
return 0;
}
/**
- * @width - on output: user width, mapped back to input
- * @height - on output: user height, mapped back to input
+ * @icd - soc-camera device
+ * @rect - camera cropping window
+ * @subrect - part of rect, sent to the user
* @mf - in- / output camera output window
+ * @width - on input: max host input width
+ * on output: user width, mapped back to input
+ * @height - on input: max host input height
+ * on output: user height, mapped back to input
+ * @host_can_scale - host can scale this pixel format
+ * @shift - shift, used for scaling
*/
-static int client_scale(struct soc_camera_device *icd,
+static int soc_camera_client_scale(struct soc_camera_device *icd,
+ struct v4l2_rect *rect, struct v4l2_rect *subrect,
struct v4l2_mbus_framefmt *mf,
unsigned int *width, unsigned int *height,
- bool ceu_can_scale)
+ bool host_can_scale, unsigned int shift)
{
- struct sh_mobile_ceu_cam *cam = icd->host_priv;
struct device *dev = icd->parent;
struct v4l2_mbus_framefmt mf_tmp = *mf;
unsigned int scale_h, scale_v;
@@ -1492,7 +1501,8 @@ static int client_scale(struct soc_camera_device *icd,
* 5. Apply iterative camera S_FMT for camera user window (also updates
* client crop cache and the imaginary sub-rectangle).
*/
- ret = client_s_fmt(icd, &mf_tmp, ceu_can_scale);
+ ret = client_s_fmt(icd, rect, subrect, *width, *height,
+ &mf_tmp, host_can_scale);
if (ret < 0)
return ret;
@@ -1504,8 +1514,8 @@ static int client_scale(struct soc_camera_device *icd,
/* unneeded - it is already in "mf_tmp" */
/* 7. Calculate new client scales. */
- scale_h = calc_generic_scale(cam->rect.width, mf_tmp.width);
- scale_v = calc_generic_scale(cam->rect.height, mf_tmp.height);
+ scale_h = soc_camera_calc_scale(rect->width, shift, mf_tmp.width);
+ scale_v = soc_camera_calc_scale(rect->height, shift, mf_tmp.height);
mf->width = mf_tmp.width;
mf->height = mf_tmp.height;
@@ -1515,8 +1525,8 @@ static int client_scale(struct soc_camera_device *icd,
* 8. Calculate new CEU crop - apply camera scales to previously
* updated "effective" crop.
*/
- *width = scale_down(cam->subrect.width, scale_h);
- *height = scale_down(cam->subrect.height, scale_v);
+ *width = soc_camera_shift_scale(subrect->width, shift, scale_h);
+ *height = soc_camera_shift_scale(subrect->height, shift, scale_v);
dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height);
@@ -1559,7 +1569,8 @@ static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
* 1. - 2. Apply iterative camera S_CROP for new input window, read back
* actual camera rectangle.
*/
- ret = client_s_crop(icd, &a_writable, &cam_crop);
+ ret = soc_camera_client_s_crop(sd, &a_writable, &cam_crop,
+ &cam->rect, &cam->subrect);
if (ret < 0)
return ret;
@@ -1683,16 +1694,16 @@ static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
* client crop. New scales are calculated from the requested output format and
* CEU crop, mapped backed onto the client input (subrect).
*/
-static void calculate_client_output(struct soc_camera_device *icd,
- const struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf)
+static void soc_camera_calc_client_output(struct soc_camera_device *icd,
+ struct v4l2_rect *rect, struct v4l2_rect *subrect,
+ const struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf,
+ unsigned int shift)
{
- struct sh_mobile_ceu_cam *cam = icd->host_priv;
struct device *dev = icd->parent;
- struct v4l2_rect *cam_subrect = &cam->subrect;
unsigned int scale_v, scale_h;
- if (cam_subrect->width == cam->rect.width &&
- cam_subrect->height == cam->rect.height) {
+ if (subrect->width == rect->width &&
+ subrect->height == rect->height) {
/* No sub-cropping */
mf->width = pix->width;
mf->height = pix->height;
@@ -1702,8 +1713,8 @@ static void calculate_client_output(struct soc_camera_device *icd,
/* 1.-2. Current camera scales and subwin - cached. */
dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
- cam_subrect->width, cam_subrect->height,
- cam_subrect->left, cam_subrect->top);
+ subrect->width, subrect->height,
+ subrect->left, subrect->top);
/*
* 3. Calculate new combined scales from input sub-window to requested
@@ -1714,8 +1725,8 @@ static void calculate_client_output(struct soc_camera_device *icd,
* TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF
* (128x96) or larger than VGA
*/
- scale_h = calc_generic_scale(cam_subrect->width, pix->width);
- scale_v = calc_generic_scale(cam_subrect->height, pix->height);
+ scale_h = soc_camera_calc_scale(subrect->width, shift, pix->width);
+ scale_v = soc_camera_calc_scale(subrect->height, shift, pix->height);
dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
@@ -1723,8 +1734,8 @@ static void calculate_client_output(struct soc_camera_device *icd,
* 4. Calculate desired client output window by applying combined scales
* to client (real) input window.
*/
- mf->width = scale_down(cam->rect.width, scale_h);
- mf->height = scale_down(cam->rect.height, scale_v);
+ mf->width = soc_camera_shift_scale(rect->width, shift, scale_h);
+ mf->height = soc_camera_shift_scale(rect->height, shift, scale_v);
}
/* Similar to set_crop multistage iterative algorithm */
@@ -1739,8 +1750,8 @@ static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
struct v4l2_mbus_framefmt mf;
__u32 pixfmt = pix->pixelformat;
const struct soc_camera_format_xlate *xlate;
- /* Keep Compiler Happy */
- unsigned int ceu_sub_width = 0, ceu_sub_height = 0;
+ unsigned int ceu_sub_width = pcdev->max_width,
+ ceu_sub_height = pcdev->max_height;
u16 scale_v, scale_h;
int ret;
bool image_mode;
@@ -1767,7 +1778,7 @@ static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
}
/* 1.-4. Calculate desired client output geometry */
- calculate_client_output(icd, pix, &mf);
+ soc_camera_calc_client_output(icd, &cam->rect, &cam->subrect, pix, &mf, 12);
mf.field = pix->field;
mf.colorspace = pix->colorspace;
mf.code = xlate->code;
@@ -1789,8 +1800,9 @@ static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
/* 5. - 9. */
- ret = client_scale(icd, &mf, &ceu_sub_width, &ceu_sub_height,
- image_mode && V4L2_FIELD_NONE == field);
+ ret = soc_camera_client_scale(icd, &cam->rect, &cam->subrect,
+ &mf, &ceu_sub_width, &ceu_sub_height,
+ image_mode && V4L2_FIELD_NONE == field, 12);
dev_geo(dev, "5-9: client scale return %d\n", ret);
--
1.7.2.5
--
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