I tried to put everyone on CC, interested in the mt9t031 driver, sorry, if
I forgot anyone.
Thanks
Guennadi
diff --git a/Documentation/video4linux/soc-camera.txt b/Documentation/video4linux/soc-camera.txt
index 178ef3c..9b230dd 100644
--- a/Documentation/video4linux/soc-camera.txt
+++ b/Documentation/video4linux/soc-camera.txt
@@ -116,5 +116,40 @@ functionality.
struct soc_camera_device also links to an array of struct soc_camera_data_format,
listing pixel formats, supported by the camera.
+VIDIOC_S_CROP and VIDIOC_S_FMT behaviour
+----------------------------------------
+
+Above user ioctls modify image geometry as follows:
+
+VIDIOC_S_CROP: sets location and sizes of the sensor window. Unit is one sensor
+pixel. Changing sensor window sizes preserves any scaling factors, therefore
+user window sizes change as well.
+
+VIDIOC_S_FMT: sets user window. Should preserve previously set sensor window as
+much as possible by modifying scaling factors. If the sensor window cannot be
+preserved precisely, it may be changed too.
+
+In soc-camera there are two locations, where scaling and cropping can taks
+place: in the camera driver and in the host driver. User ioctls are first passed
+to the host driver, which then generally passes them down to the camera driver.
+It is more efficient to perform scaling and cropping in the camera driver to
+save camera bus bandwidth and maximise the framerate. However, if the camera
+driver failed to set the required parameters with sufficient precision, the host
+driver may decide to also use its own scaling and cropping to fulfill the user's
+request.
+
+Camera drivers are interfaced to the soc-camera core and to host drivers over
+the v4l2-subdev API, which is completely functional, it doesn't pass any data.
+Therefore all camera drivers shall reply to .g_fmt() requests with their current
+output geometry. This is necessary to correctly configure the camera bus.
+.s_fmt() and .try_fmt() have to be implemented too. Sensor window and scaling
+factors have to be maintained by camera drivers internally.
+
+User window geometry is kept in .user_width and .user_height fields in struct
+soc_camera_device and used by the soc-camera core and host drivers. The core
+updates these fields upon successful completion of a .s_fmt() call, but if these
+fields change elsewhere, e.g., during .s_crop() processing, the host driver is
+responsible for updating them.
+
--
Author: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
diff --git a/drivers/media/video/mt9t031.c b/drivers/media/video/mt9t031.c
index 3bfc008..3b72e6e 100644
--- a/drivers/media/video/mt9t031.c
+++ b/drivers/media/video/mt9t031.c
@@ -47,7 +47,7 @@
#define MT9T031_MAX_HEIGHT 1536
#define MT9T031_MAX_WIDTH 2048
#define MT9T031_MIN_HEIGHT 2
-#define MT9T031_MIN_WIDTH 2
+#define MT9T031_MIN_WIDTH 18
#define MT9T031_HORIZONTAL_BLANK 142
#define MT9T031_VERTICAL_BLANK 25
#define MT9T031_COLUMN_SKIP 32
@@ -69,10 +69,11 @@ static const struct soc_camera_data_format mt9t031_colour_formats[] = {
struct mt9t031 {
struct v4l2_subdev subdev;
+ struct v4l2_rect rect; /* Sensor window */
int model; /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
- unsigned char autoexposure;
u16 xskip;
u16 yskip;
+ unsigned char autoexposure;
};
static struct mt9t031 *to_mt9t031(const struct i2c_client *client)
@@ -218,55 +219,62 @@ static unsigned long mt9t031_query_bus_param(struct soc_camera_device *icd)
return soc_camera_apply_sensor_flags(icl, MT9T031_BUS_PARAM);
}
-/* Round up minima and round down maxima */
-static void recalculate_limits(struct soc_camera_device *icd,
- u16 xskip, u16 yskip)
+/* target must be _even_ */
+static u16 mt9t031_skip(s32 *source, s32 target, s32 max)
{
- icd->rect_max.left = (MT9T031_COLUMN_SKIP + xskip - 1) / xskip;
- icd->rect_max.top = (MT9T031_ROW_SKIP + yskip - 1) / yskip;
- icd->width_min = (MT9T031_MIN_WIDTH + xskip - 1) / xskip;
- icd->height_min = (MT9T031_MIN_HEIGHT + yskip - 1) / yskip;
- icd->rect_max.width = MT9T031_MAX_WIDTH / xskip;
- icd->rect_max.height = MT9T031_MAX_HEIGHT / yskip;
+ unsigned int skip;
+
+ if (*source < target + target / 2) {
+ *source = target;
+ return 1;
+ }
+
+ skip = min(max, *source + target / 2) / target;
+ if (skip > 8)
+ skip = 8;
+ *source = target * skip;
+
+ return skip;
}
+/* rect is the sensor rectangle, the caller guarantees parameter validity */
static int mt9t031_set_params(struct soc_camera_device *icd,
struct v4l2_rect *rect, u16 xskip, u16 yskip)
{
struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd));
struct mt9t031 *mt9t031 = to_mt9t031(client);
int ret;
- u16 xbin, ybin, width, height, left, top;
+ u16 xbin, ybin;
const u16 hblank = MT9T031_HORIZONTAL_BLANK,
vblank = MT9T031_VERTICAL_BLANK;
- width = rect->width * xskip;
- height = rect->height * yskip;
- left = rect->left * xskip;
- top = rect->top * yskip;
-
xbin = min(xskip, (u16)3);
ybin = min(yskip, (u16)3);
- dev_dbg(&icd->dev, "xskip %u, width %u/%u, yskip %u, height %u/%u\n",
- xskip, width, rect->width, yskip, height, rect->height);
-
- /* Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper */
+ /*
+ * Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper.
+ * There is always a valid suitably aligned value. The worst case is
+ * xbin = 3, width = 2048. Then we will start at 36, the last read out
+ * pixel will be 2083, which is < 2085 - first black pixel.
+ *
+ * MT9T031 datasheet imposes window left border alignment, depending on
+ * the selected xskip. Failing to conform to this requirement produces
+ * dark horizontal stripes in the image. However, even obeying to this
+ * requirement doesn't eliminate the stripes in all configurations. They
+ * appear "locally reproducibly," but can differ between tests under
+ * different lighting conditions.
+ */
switch (xbin) {
case 2:
- left = (left + 3) & ~3;
+ rect->left = rect->left & ~3;
break;
case 3:
- left = roundup(left, 6);
+ rect->left = rect->left > roundup(MT9T031_COLUMN_SKIP, 6) ?
+ (rect->left / 6) * 6 : roundup(MT9T031_COLUMN_SKIP, 6);
}
- switch (ybin) {
- case 2:
- top = (top + 3) & ~3;
- break;
- case 3:
- top = roundup(top, 6);
- }
+ dev_dbg(&client->dev, "skip %u:%u, rect %ux%u@%u:%u\n",
+ xskip, yskip, rect->width, rect->height, rect->left, rect->top);
/* Disable register update, reconfigure atomically */
ret = reg_set(client, MT9T031_OUTPUT_CONTROL, 1);
@@ -287,27 +295,29 @@ static int mt9t031_set_params(struct soc_camera_device *icd,
ret = reg_write(client, MT9T031_ROW_ADDRESS_MODE,
((ybin - 1) << 4) | (yskip - 1));
}
- dev_dbg(&icd->dev, "new physical left %u, top %u\n", left, top);
+ dev_dbg(&client->dev, "new physical left %u, top %u\n",
+ rect->left, rect->top);
/* The caller provides a supported format, as guaranteed by
* icd->try_fmt_cap(), soc_camera_s_crop() and soc_camera_cropcap() */
if (ret >= 0)
- ret = reg_write(client, MT9T031_COLUMN_START, left);
+ ret = reg_write(client, MT9T031_COLUMN_START, rect->left);
if (ret >= 0)
- ret = reg_write(client, MT9T031_ROW_START, top);
+ ret = reg_write(client, MT9T031_ROW_START, rect->top);
if (ret >= 0)
- ret = reg_write(client, MT9T031_WINDOW_WIDTH, width - 1);
+ ret = reg_write(client, MT9T031_WINDOW_WIDTH, rect->width - 1);
if (ret >= 0)
ret = reg_write(client, MT9T031_WINDOW_HEIGHT,
- height + icd->y_skip_top - 1);
+ rect->height + icd->y_skip_top - 1);
if (ret >= 0 && mt9t031->autoexposure) {
- ret = set_shutter(client, height + icd->y_skip_top + vblank);
+ ret = set_shutter(client,
+ rect->height + icd->y_skip_top + vblank);
if (ret >= 0) {
const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
const struct v4l2_queryctrl *qctrl =
soc_camera_find_qctrl(icd->ops,
V4L2_CID_EXPOSURE);
- icd->exposure = (shutter_max / 2 + (height +
+ icd->exposure = (shutter_max / 2 + (rect->height +
icd->y_skip_top + vblank - 1) *
(qctrl->maximum - qctrl->minimum)) /
shutter_max + qctrl->minimum;
@@ -318,27 +328,69 @@ static int mt9t031_set_params(struct soc_camera_device *icd,
if (ret >= 0)
ret = reg_clear(client, MT9T031_OUTPUT_CONTROL, 1);
+ if (ret >= 0) {
+ mt9t031->rect = *rect;
+ mt9t031->xskip = xskip;
+ mt9t031->yskip = yskip;
+ }
+
return ret < 0 ? ret : 0;
}
static int mt9t031_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
{
- struct v4l2_rect *rect = &a->c;
+ struct v4l2_rect rect = a->c;
struct i2c_client *client = sd->priv;
struct mt9t031 *mt9t031 = to_mt9t031(client);
struct soc_camera_device *icd = client->dev.platform_data;
- /* Make sure we don't exceed sensor limits */
- if (rect->left + rect->width > icd->rect_max.left + icd->rect_max.width)
- rect->left = icd->rect_max.width + icd->rect_max.left -
- rect->width;
+ soc_camera_limit_side(&rect.left, &rect.width,
+ MT9T031_COLUMN_SKIP, MT9T031_MIN_WIDTH, MT9T031_MAX_WIDTH);
+
+ soc_camera_limit_side(&rect.top, &rect.height,
+ MT9T031_ROW_SKIP, MT9T031_MIN_HEIGHT, MT9T031_MAX_HEIGHT);
+
+ return mt9t031_set_params(icd, &rect, mt9t031->xskip, mt9t031->yskip);
+}
+
+static int mt9t031_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
+{
+ struct i2c_client *client = sd->priv;
+ struct mt9t031 *mt9t031 = to_mt9t031(client);
+
+ a->c = mt9t031->rect;
+ a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+
+ return 0;
+}
- if (rect->top + rect->height > icd->rect_max.height + icd->rect_max.top)
- rect->top = icd->rect_max.height + icd->rect_max.top -
- rect->height;
+static int mt9t031_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a)
+{
+ a->bounds.left = MT9T031_COLUMN_SKIP;
+ a->bounds.top = MT9T031_ROW_SKIP;
+ a->bounds.width = MT9T031_MAX_WIDTH;
+ a->bounds.height = MT9T031_MAX_HEIGHT;
+ a->defrect = a->bounds;
+ a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ a->pixelaspect.numerator = 1; /* What are these */
+ a->pixelaspect.denominator = 1; /* good for? */
- /* CROP - no change in scaling, or in limits */
- return mt9t031_set_params(icd, rect, mt9t031->xskip, mt9t031->yskip);
+ return 0;
+}
+
+static int mt9t031_g_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
+{
+ struct i2c_client *client = sd->priv;
+ struct mt9t031 *mt9t031 = to_mt9t031(client);
+ struct v4l2_pix_format *pix = &f->fmt.pix;
+
+ pix->width = mt9t031->rect.width / mt9t031->xskip;
+ pix->height = mt9t031->rect.height / mt9t031->yskip;
+ pix->pixelformat = V4L2_PIX_FMT_SGRBG10;
+ pix->field = V4L2_FIELD_NONE;
+ pix->colorspace = V4L2_COLORSPACE_SRGB;
+
+ return 0;
}
static int mt9t031_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
@@ -346,55 +398,43 @@ static int mt9t031_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
struct i2c_client *client = sd->priv;
struct mt9t031 *mt9t031 = to_mt9t031(client);
struct soc_camera_device *icd = client->dev.platform_data;
- int ret;
+ struct v4l2_pix_format *pix = &f->fmt.pix;
u16 xskip, yskip;
- struct v4l2_rect rect = {
- .left = icd->rect_current.left,
- .top = icd->rect_current.top,
- .width = f->fmt.pix.width,
- .height = f->fmt.pix.height,
- };
+ struct v4l2_rect rect = mt9t031->rect;
/*
- * try_fmt has put rectangle within limits.
- * S_FMT - use binning and skipping for scaling, recalculate
- * limits, used for cropping
+ * try_fmt has put width and height within limits.
+ * S_FMT: use binning and skipping for scaling
*/
- /* Is this more optimal than just a division? */
- for (xskip = 8; xskip > 1; xskip--)
- if (rect.width * xskip <= MT9T031_MAX_WIDTH)
- break;
-
- for (yskip = 8; yskip > 1; yskip--)
- if (rect.height * yskip <= MT9T031_MAX_HEIGHT)
- break;
-
- recalculate_limits(icd, xskip, yskip);
-
- ret = mt9t031_set_params(icd, &rect, xskip, yskip);
- if (!ret) {
- mt9t031->xskip = xskip;
- mt9t031->yskip = yskip;
- }
+ xskip = mt9t031_skip(&rect.width, pix->width, MT9T031_MAX_WIDTH);
+ yskip = mt9t031_skip(&rect.height, pix->height, MT9T031_MAX_HEIGHT);
- return ret;
+ /* mt9t031_set_params() doesn't change width and height */
+ return mt9t031_set_params(icd, &rect, xskip, yskip);
}
+/*
+ * If a user window larger than sensor window is requested, we'll increase the
+ * sensor window.
+ */
static int mt9t031_try_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
{
struct v4l2_pix_format *pix = &f->fmt.pix;
- if (pix->height < MT9T031_MIN_HEIGHT)
- pix->height = MT9T031_MIN_HEIGHT;
- if (pix->height > MT9T031_MAX_HEIGHT)
- pix->height = MT9T031_MAX_HEIGHT;
+ /* This implicitly uses the fact, that our maxima and minima are even */
if (pix->width < MT9T031_MIN_WIDTH)
pix->width = MT9T031_MIN_WIDTH;
- if (pix->width > MT9T031_MAX_WIDTH)
+ else if (pix->width > MT9T031_MAX_WIDTH)
pix->width = MT9T031_MAX_WIDTH;
+ else
+ pix->width &= ~0x01; /* has to be even */
- pix->width &= ~0x01; /* has to be even */
- pix->height &= ~0x01; /* has to be even */
+ if (pix->height < MT9T031_MIN_HEIGHT)
+ pix->height = MT9T031_MIN_HEIGHT;
+ else if (pix->height > MT9T031_MAX_HEIGHT)
+ pix->height = MT9T031_MAX_HEIGHT;
+ else
+ pix->height &= ~0x01; /* has to be even */
return 0;
}
@@ -575,7 +615,7 @@ static int mt9t031_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
unsigned long range = qctrl->default_value - qctrl->minimum;
data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
- dev_dbg(&icd->dev, "Setting gain %d\n", data);
+ dev_dbg(&client->dev, "Setting gain %d\n", data);
data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
if (data < 0)
return -EIO;
@@ -595,7 +635,7 @@ static int mt9t031_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
/* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;
- dev_dbg(&icd->dev, "Setting gain from 0x%x to 0x%x\n",
+ dev_dbg(&client->dev, "Setting gain from 0x%x to 0x%x\n",
reg_read(client, MT9T031_GLOBAL_GAIN), data);
data = reg_write(client, MT9T031_GLOBAL_GAIN, data);
if (data < 0)
@@ -616,7 +656,7 @@ static int mt9t031_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
u32 old;
get_shutter(client, &old);
- dev_dbg(&icd->dev, "Setting shutter width from %u to %u\n",
+ dev_dbg(&client->dev, "Setting shutter width from %u to %u\n",
old, shutter);
if (set_shutter(client, shutter) < 0)
return -EIO;
@@ -628,12 +668,12 @@ static int mt9t031_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
if (ctrl->value) {
const u16 vblank = MT9T031_VERTICAL_BLANK;
const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
- if (set_shutter(client, icd->rect_current.height +
+ if (set_shutter(client, mt9t031->rect.height +
icd->y_skip_top + vblank) < 0)
return -EIO;
qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
icd->exposure = (shutter_max / 2 +
- (icd->rect_current.height +
+ (mt9t031->rect.height +
icd->y_skip_top + vblank - 1) *
(qctrl->maximum - qctrl->minimum)) /
shutter_max + qctrl->minimum;
@@ -653,15 +693,9 @@ static int mt9t031_video_probe(struct i2c_client *client)
struct mt9t031 *mt9t031 = to_mt9t031(client);
s32 data;
- /* We must have a parent by now. And it cannot be a wrong one.
- * So this entire test is completely redundant. */
- if (!icd->dev.parent ||
- to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
- return -ENODEV;
-
/* Enable the chip */
data = reg_write(client, MT9T031_CHIP_ENABLE, 1);
- dev_dbg(&icd->dev, "write: %d\n", data);
+ dev_dbg(&client->dev, "write: %d\n", data);
/* Read out the chip version register */
data = reg_read(client, MT9T031_CHIP_VERSION);
@@ -673,12 +707,12 @@ static int mt9t031_video_probe(struct i2c_client *client)
icd->num_formats = ARRAY_SIZE(mt9t031_colour_formats);
break;
default:
- dev_err(&icd->dev,
+ dev_err(&client->dev,
"No MT9T031 chip detected, register read %x\n", data);
return -ENODEV;
}
- dev_info(&icd->dev, "Detected a MT9T031 chip ID %x\n", data);
+ dev_info(&client->dev, "Detected a MT9T031 chip ID %x\n", data);
return 0;
}
@@ -696,8 +730,11 @@ static struct v4l2_subdev_core_ops mt9t031_subdev_core_ops = {
static struct v4l2_subdev_video_ops mt9t031_subdev_video_ops = {
.s_stream = mt9t031_s_stream,
.s_fmt = mt9t031_s_fmt,
+ .g_fmt = mt9t031_g_fmt,
.try_fmt = mt9t031_try_fmt,
.s_crop = mt9t031_s_crop,
+ .g_crop = mt9t031_g_crop,
+ .cropcap = mt9t031_cropcap,
};
static struct v4l2_subdev_ops mt9t031_subdev_ops = {
@@ -739,15 +776,13 @@ static int mt9t031_probe(struct i2c_client *client,
/* Second stage probe - when a capture adapter is there */
icd->ops = &mt9t031_ops;
- icd->rect_max.left = MT9T031_COLUMN_SKIP;
- icd->rect_max.top = MT9T031_ROW_SKIP;
- icd->rect_current.left = icd->rect_max.left;
- icd->rect_current.top = icd->rect_max.top;
- icd->width_min = MT9T031_MIN_WIDTH;
- icd->rect_max.width = MT9T031_MAX_WIDTH;
- icd->height_min = MT9T031_MIN_HEIGHT;
- icd->rect_max.height = MT9T031_MAX_HEIGHT;
icd->y_skip_top = 0;
+
+ mt9t031->rect.left = MT9T031_COLUMN_SKIP;
+ mt9t031->rect.top = MT9T031_ROW_SKIP;
+ mt9t031->rect.width = MT9T031_MAX_WIDTH;
+ mt9t031->rect.height = MT9T031_MAX_HEIGHT;
+
/* Simulated autoexposure. If enabled, we calculate shutter width
* ourselves in the driver based on vertical blanking and frame width */
mt9t031->autoexposure = 1;
diff --git a/drivers/media/video/mx3_camera.c b/drivers/media/video/mx3_camera.c
index 157aed9..c8cac3a 100644
--- a/drivers/media/video/mx3_camera.c
+++ b/drivers/media/video/mx3_camera.c
@@ -59,6 +59,9 @@
#define MAX_VIDEO_MEM 16
+#define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
+ ((x) >> 24) & 0xff
+
struct mx3_camera_buffer {
/* common v4l buffer stuff -- must be first */
struct videobuf_buffer vb;
@@ -220,7 +223,7 @@ static int mx3_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
if (!mx3_cam->idmac_channel[0])
return -EINVAL;
- *size = icd->rect_current.width * icd->rect_current.height * bpp;
+ *size = icd->user_width * icd->user_height * bpp;
if (!*count)
*count = 32;
@@ -241,7 +244,7 @@ static int mx3_videobuf_prepare(struct videobuf_queue *vq,
struct mx3_camera_buffer *buf =
container_of(vb, struct mx3_camera_buffer, vb);
/* current_fmt _must_ always be set */
- size_t new_size = icd->rect_current.width * icd->rect_current.height *
+ size_t new_size = icd->user_width * icd->user_height *
((icd->current_fmt->depth + 7) >> 3);
int ret;
@@ -251,12 +254,12 @@ static int mx3_videobuf_prepare(struct videobuf_queue *vq,
*/
if (buf->fmt != icd->current_fmt ||
- vb->width != icd->rect_current.width ||
- vb->height != icd->rect_current.height ||
+ vb->width != icd->user_width ||
+ vb->height != icd->user_height ||
vb->field != field) {
buf->fmt = icd->current_fmt;
- vb->width = icd->rect_current.width;
- vb->height = icd->rect_current.height;
+ vb->width = icd->user_width;
+ vb->height = icd->user_height;
vb->field = field;
if (vb->state != VIDEOBUF_NEEDS_INIT)
free_buffer(vq, buf);
@@ -350,9 +353,9 @@ static void mx3_videobuf_queue(struct videobuf_queue *vq,
/* This is the configuration of one sg-element */
video->out_pixel_fmt = fourcc_to_ipu_pix(data_fmt->fourcc);
- video->out_width = icd->rect_current.width;
- video->out_height = icd->rect_current.height;
- video->out_stride = icd->rect_current.width;
+ video->out_width = icd->user_width;
+ video->out_height = icd->user_height;
+ video->out_stride = icd->user_width;
#ifdef DEBUG
/* helps to see what DMA actually has written */
@@ -538,7 +541,7 @@ static bool channel_change_requested(struct soc_camera_device *icd,
/* Do buffers have to be re-allocated or channel re-configured? */
return ichan && rect->width * rect->height >
- icd->rect_current.width * icd->rect_current.height;
+ icd->user_width * icd->user_height;
}
static int test_platform_param(struct mx3_camera_dev *mx3_cam,
@@ -586,7 +589,7 @@ static int test_platform_param(struct mx3_camera_dev *mx3_cam,
*flags |= SOCAM_DATAWIDTH_4;
break;
default:
- dev_info(mx3_cam->soc_host.v4l2_dev.dev, "Unsupported bus width %d\n",
+ dev_warn(mx3_cam->soc_host.v4l2_dev.dev, "Unsupported bus width %d\n",
buswidth);
return -EINVAL;
}
@@ -720,13 +723,13 @@ passthrough:
}
static void configure_geometry(struct mx3_camera_dev *mx3_cam,
- struct v4l2_rect *rect)
+ unsigned int width, unsigned int height)
{
u32 ctrl, width_field, height_field;
/* Setup frame size - this cannot be changed on-the-fly... */
- width_field = rect->width - 1;
- height_field = rect->height - 1;
+ width_field = width - 1;
+ height_field = height - 1;
csi_reg_write(mx3_cam, width_field | (height_field << 16), CSI_SENS_FRM_SIZE);
csi_reg_write(mx3_cam, width_field << 16, CSI_FLASH_STROBE_1);
@@ -738,11 +741,6 @@ static void configure_geometry(struct mx3_camera_dev *mx3_cam,
ctrl = csi_reg_read(mx3_cam, CSI_OUT_FRM_CTRL) & 0xffff0000;
/* Sensor does the cropping */
csi_reg_write(mx3_cam, ctrl | 0 | (0 << 8), CSI_OUT_FRM_CTRL);
-
- /*
- * No need to free resources here if we fail, we'll see if we need to
- * do this next time we are called
- */
}
static int acquire_dma_channel(struct mx3_camera_dev *mx3_cam)
@@ -779,6 +777,22 @@ static int acquire_dma_channel(struct mx3_camera_dev *mx3_cam)
return 0;
}
+/*
+ * FIXME: learn to use stride != width, then we can keep stride properly aligned
+ * and support arbitrary (even) widths.
+ */
+static inline void stride_align(__s32 *width)
+{
+ if (((*width + 7) & ~7) < 4096)
+ *width = (*width + 7) & ~7;
+ else
+ *width = *width & ~7;
+}
+
+/*
+ * As long as we don't implement host-side cropping and scaling, we can use
+ * default g_crop and cropcap from soc_camera.c
+ */
static int mx3_camera_set_crop(struct soc_camera_device *icd,
struct v4l2_crop *a)
{
@@ -786,20 +800,51 @@ static int mx3_camera_set_crop(struct soc_camera_device *icd,
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct mx3_camera_dev *mx3_cam = ici->priv;
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+ struct v4l2_format f = {.type = V4L2_BUF_TYPE_VIDEO_CAPTURE};
+ struct v4l2_pix_format *pix = &f.fmt.pix;
+ int ret;
- /*
- * We now know pixel formats and can decide upon DMA-channel(s)
- * So far only direct camera-to-memory is supported
- */
- if (channel_change_requested(icd, rect)) {
- int ret = acquire_dma_channel(mx3_cam);
+ soc_camera_limit_side(&rect->left, &rect->width, 0, 2, 4096);
+ soc_camera_limit_side(&rect->top, &rect->height, 0, 2, 4096);
+
+ ret = v4l2_subdev_call(sd, video, s_crop, a);
+ if (ret < 0)
+ return ret;
+
+ /* The capture device might have changed its output */
+ ret = v4l2_subdev_call(sd, video, g_fmt, &f);
+ if (ret < 0)
+ return ret;
+
+ if (pix->width & 7) {
+ /* Ouch! We can only handle 8-byte aligned width... */
+ stride_align(&pix->width);
+ ret = v4l2_subdev_call(sd, video, s_fmt, &f);
if (ret < 0)
return ret;
}
- configure_geometry(mx3_cam, rect);
+ if (pix->width != icd->user_width || pix->height != icd->user_height) {
+ /*
+ * We now know pixel formats and can decide upon DMA-channel(s)
+ * So far only direct camera-to-memory is supported
+ */
+ if (channel_change_requested(icd, rect)) {
+ int ret = acquire_dma_channel(mx3_cam);
+ if (ret < 0)
+ return ret;
+ }
+
+ configure_geometry(mx3_cam, pix->width, pix->height);
+ }
+
+ dev_dbg(&icd->dev, "Sensor cropped for %c%c%c%c %dx%d\n",
+ pixfmtstr(pix->pixelformat), pix->width, pix->height);
- return v4l2_subdev_call(sd, video, s_crop, a);
+ icd->user_width = pix->width;
+ icd->user_height = pix->height;
+
+ return ret;
}
static int mx3_camera_set_fmt(struct soc_camera_device *icd,
@@ -810,12 +855,6 @@ static int mx3_camera_set_fmt(struct soc_camera_device *icd,
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
const struct soc_camera_format_xlate *xlate;
struct v4l2_pix_format *pix = &f->fmt.pix;
- struct v4l2_rect rect = {
- .left = icd->rect_current.left,
- .top = icd->rect_current.top,
- .width = pix->width,
- .height = pix->height,
- };
int ret;
xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
@@ -824,6 +863,10 @@ static int mx3_camera_set_fmt(struct soc_camera_device *icd,
return -EINVAL;
}
+ stride_align(&pix->width);
+ dev_dbg(&icd->dev, "Configure for %c%c%c%c %dx%d\n",
+ pixfmtstr(xlate->host_fmt->fourcc), pix->width, pix->height);
+
ret = acquire_dma_channel(mx3_cam);
if (ret < 0)
return ret;
@@ -834,7 +877,7 @@ static int mx3_camera_set_fmt(struct soc_camera_device *icd,
* mxc_v4l2_s_fmt()
*/
- configure_geometry(mx3_cam, &rect);
+ configure_geometry(mx3_cam, pix->width, pix->height);
ret = v4l2_subdev_call(sd, video, s_fmt, f);
if (!ret) {
@@ -842,6 +885,9 @@ static int mx3_camera_set_fmt(struct soc_camera_device *icd,
icd->current_fmt = xlate->host_fmt;
}
+ dev_dbg(&icd->dev, "Sensor configured for %c%c%c%c %dx%d\n",
+ pixfmtstr(pix->pixelformat), pix->width, pix->height);
+
return ret;
}
diff --git a/drivers/media/video/soc_camera.c b/drivers/media/video/soc_camera.c
index 37e5a10..8bddd34 100644
--- a/drivers/media/video/soc_camera.c
+++ b/drivers/media/video/soc_camera.c
@@ -302,17 +302,17 @@ static int soc_camera_set_fmt(struct soc_camera_file *icf,
return -EINVAL;
}
- icd->rect_current.width = pix->width;
- icd->rect_current.height = pix->height;
- icf->vb_vidq.field =
- icd->field = pix->field;
+ icd->user_width = pix->width;
+ icd->user_height = pix->height;
+ icf->vb_vidq.field =
+ icd->field = pix->field;
if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
f->type);
dev_dbg(&icd->dev, "set width: %d height: %d\n",
- icd->rect_current.width, icd->rect_current.height);
+ icd->user_width, icd->user_height);
/* set physical bus parameters */
return ici->ops->set_bus_param(icd, pix->pixelformat);
@@ -355,8 +355,8 @@ static int soc_camera_open(struct file *file)
struct v4l2_format f = {
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
.fmt.pix = {
- .width = icd->rect_current.width,
- .height = icd->rect_current.height,
+ .width = icd->user_width,
+ .height = icd->user_height,
.field = icd->field,
.pixelformat = icd->current_fmt->fourcc,
.colorspace = icd->current_fmt->colorspace,
@@ -559,8 +559,8 @@ static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
WARN_ON(priv != file->private_data);
- pix->width = icd->rect_current.width;
- pix->height = icd->rect_current.height;
+ pix->width = icd->user_width;
+ pix->height = icd->user_height;
pix->field = icf->vb_vidq.field;
pix->pixelformat = icd->current_fmt->fourcc;
pix->bytesperline = pix->width *
@@ -724,17 +724,9 @@ static int soc_camera_cropcap(struct file *file, void *fh,
{
struct soc_camera_file *icf = file->private_data;
struct soc_camera_device *icd = icf->icd;
+ struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
- a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- a->bounds = icd->rect_max;
- a->defrect.left = icd->rect_max.left;
- a->defrect.top = icd->rect_max.top;
- a->defrect.width = DEFAULT_WIDTH;
- a->defrect.height = DEFAULT_HEIGHT;
- a->pixelaspect.numerator = 1;
- a->pixelaspect.denominator = 1;
-
- return 0;
+ return ici->ops->cropcap(icd, a);
}
static int soc_camera_g_crop(struct file *file, void *fh,
@@ -742,11 +734,14 @@ static int soc_camera_g_crop(struct file *file, void *fh,
{
struct soc_camera_file *icf = file->private_data;
struct soc_camera_device *icd = icf->icd;
+ struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+ int ret;
- a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- a->c = icd->rect_current;
+ mutex_lock(&icf->vb_vidq.vb_lock);
+ ret = ici->ops->get_crop(icd, a);
+ mutex_unlock(&icf->vb_vidq.vb_lock);
- return 0;
+ return ret;
}
/*
@@ -761,7 +756,7 @@ static int soc_camera_s_crop(struct file *file, void *fh,
struct soc_camera_file *icf = file->private_data;
struct soc_camera_device *icd = icf->icd;
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
- struct v4l2_rect rect = a->c;
+ struct v4l2_crop current_crop;
int ret;
if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
@@ -770,38 +765,20 @@ static int soc_camera_s_crop(struct file *file, void *fh,
/* Cropping is allowed during a running capture, guard consistency */
mutex_lock(&icf->vb_vidq.vb_lock);
+ /* If get_crop fails, we'll let host and / or client drivers decide */
+ ret = ici->ops->get_crop(icd, ¤t_crop);
+
/* Prohibit window size change with initialised buffers */
- if (icf->vb_vidq.bufs[0] && (rect.width != icd->rect_current.width ||
- rect.height != icd->rect_current.height)) {
+ if (icf->vb_vidq.bufs[0] && !ret &&
+ (a->c.width != current_crop.c.width ||
+ a->c.height != current_crop.c.height)) {
dev_err(&icd->dev,
"S_CROP denied: queue initialised and sizes differ\n");
ret = -EBUSY;
goto unlock;
}
- if (rect.width > icd->rect_max.width)
- rect.width = icd->rect_max.width;
-
- if (rect.width < icd->width_min)
- rect.width = icd->width_min;
-
- if (rect.height > icd->rect_max.height)
- rect.height = icd->rect_max.height;
-
- if (rect.height < icd->height_min)
- rect.height = icd->height_min;
-
- if (rect.width + rect.left > icd->rect_max.width + icd->rect_max.left)
- rect.left = icd->rect_max.width + icd->rect_max.left -
- rect.width;
-
- if (rect.height + rect.top > icd->rect_max.height + icd->rect_max.top)
- rect.top = icd->rect_max.height + icd->rect_max.top -
- rect.height;
-
ret = ici->ops->set_crop(icd, a);
- if (!ret)
- icd->rect_current = rect;
unlock:
mutex_unlock(&icf->vb_vidq.vb_lock);
@@ -928,6 +905,8 @@ static int soc_camera_probe(struct device *dev)
struct soc_camera_host *ici = to_soc_camera_host(dev->parent);
struct soc_camera_link *icl = to_soc_camera_link(icd);
struct device *control = NULL;
+ struct v4l2_subdev *sd;
+ struct v4l2_format f = {.type = V4L2_BUF_TYPE_VIDEO_CAPTURE};
int ret;
dev_info(dev, "Probing %s\n", dev_name(dev));
@@ -984,7 +963,6 @@ static int soc_camera_probe(struct device *dev)
if (ret < 0)
goto eiufmt;
- icd->rect_current = icd->rect_max;
icd->field = V4L2_FIELD_ANY;
/* ..._video_start() will create a device node, so we have to protect */
@@ -994,9 +972,15 @@ static int soc_camera_probe(struct device *dev)
if (ret < 0)
goto evidstart;
+ /* Try to improve our guess of a reasonable window format */
+ sd = soc_camera_to_subdev(icd);
+ if (!v4l2_subdev_call(sd, video, g_fmt, &f)) {
+ icd->user_width = f.fmt.pix.width;
+ icd->user_height = f.fmt.pix.height;
+ }
+
/* Do we have to sysfs_remove_link() before device_unregister()? */
- if (to_soc_camera_control(icd) &&
- sysfs_create_link(&icd->dev.kobj, &to_soc_camera_control(icd)->kobj,
+ if (sysfs_create_link(&icd->dev.kobj, &to_soc_camera_control(icd)->kobj,
"control"))
dev_warn(&icd->dev, "Failed creating the control symlink\n");
@@ -1105,6 +1089,24 @@ static void dummy_release(struct device *dev)
{
}
+static int default_cropcap(struct soc_camera_device *icd, struct v4l2_cropcap *a)
+{
+ struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+ return v4l2_subdev_call(sd, video, cropcap, a);
+}
+
+static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
+{
+ struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+ return v4l2_subdev_call(sd, video, g_crop, a);
+}
+
+static int default_s_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
+{
+ struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+ return v4l2_subdev_call(sd, video, s_crop, a);
+}
+
int soc_camera_host_register(struct soc_camera_host *ici)
{
struct soc_camera_host *ix;
@@ -1113,7 +1115,6 @@ int soc_camera_host_register(struct soc_camera_host *ici)
if (!ici || !ici->ops ||
!ici->ops->try_fmt ||
!ici->ops->set_fmt ||
- !ici->ops->set_crop ||
!ici->ops->set_bus_param ||
!ici->ops->querycap ||
!ici->ops->init_videobuf ||
@@ -1124,6 +1125,13 @@ int soc_camera_host_register(struct soc_camera_host *ici)
!ici->v4l2_dev.dev)
return -EINVAL;
+ if (!ici->ops->set_crop)
+ ici->ops->set_crop = default_s_crop;
+ if (!ici->ops->get_crop)
+ ici->ops->get_crop = default_g_crop;
+ if (!ici->ops->cropcap)
+ ici->ops->cropcap = default_cropcap;
+
mutex_lock(&list_lock);
list_for_each_entry(ix, &hosts, list) {
if (ix->nr == ici->nr) {
@@ -1323,6 +1331,9 @@ static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
if (ret < 0)
goto escdevreg;
+ icd->user_width = DEFAULT_WIDTH;
+ icd->user_height = DEFAULT_HEIGHT;
+
return 0;
escdevreg:
diff --git a/include/media/soc_camera.h b/include/media/soc_camera.h
index 344d899..cbd6654 100644
--- a/include/media/soc_camera.h
+++ b/include/media/soc_camera.h
@@ -22,8 +22,8 @@ struct soc_camera_device {
struct list_head list;
struct device dev;
struct device *pdev; /* Platform device */
- struct v4l2_rect rect_current; /* Current window */
- struct v4l2_rect rect_max; /* Maximum window */
+ s32 user_width;
+ s32 user_height;
unsigned short width_min;
unsigned short height_min;
unsigned short y_skip_top; /* Lines to skip at the top */
@@ -76,6 +76,8 @@ struct soc_camera_host_ops {
int (*get_formats)(struct soc_camera_device *, int,
struct soc_camera_format_xlate *);
void (*put_formats)(struct soc_camera_device *);
+ int (*cropcap)(struct soc_camera_device *, struct v4l2_cropcap *);
+ int (*get_crop)(struct soc_camera_device *, struct v4l2_crop *);
int (*set_crop)(struct soc_camera_device *, struct v4l2_crop *);
int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
@@ -277,6 +279,21 @@ static inline unsigned long soc_camera_bus_param_compatible(
common_flags;
}
+static inline void soc_camera_limit_side(unsigned int *start,
+ unsigned int *length, unsigned int start_min,
+ unsigned int length_min, unsigned int length_max)
+{
+ if (*length < length_min)
+ *length = length_min;
+ else if (*length > length_max)
+ *length = length_max;
+
+ if (*start < start_min)
+ *start = start_min;
+ else if (*start + *length > start_min + length_max)
+ *start = start_min + length_max - *length;
+}
+
extern unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
unsigned long flags);
