Hi Jacopo
Thanks for the review.
On Thu, 6 Oct 2022 at 10:43, Jacopo Mondi <jacopo@xxxxxxxxxx> wrote:
>
> Hi Dave
>
> On Wed, Oct 05, 2022 at 04:28:06PM +0100, Dave Stevenson wrote:
> > As required by libcamera, add the relevant cropping targets
> > to report which portion of the sensor is being read out in
> > any mode.
> >
> > Signed-off-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
> > ---
> > drivers/media/i2c/ov9282.c | 75 ++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 75 insertions(+)
> >
> > diff --git a/drivers/media/i2c/ov9282.c b/drivers/media/i2c/ov9282.c
> > index 8e86aa7e4b2a..d892f53fb1ea 100644
> > --- a/drivers/media/i2c/ov9282.c
> > +++ b/drivers/media/i2c/ov9282.c
> > @@ -67,6 +67,17 @@
> > #define OV9282_PIXEL_RATE (OV9282_LINK_FREQ * 2 * \
> > OV9282_NUM_DATA_LANES / 10)
> >
> > +/*
> > + * OV9282 native and active pixel array size.
> > + * 8 dummy rows/columns on each edge of a 1280x800 active array
> > + */
> > +#define OV9282_NATIVE_WIDTH 1296U
> > +#define OV9282_NATIVE_HEIGHT 816U
> > +#define OV9282_PIXEL_ARRAY_LEFT 8U
> > +#define OV9282_PIXEL_ARRAY_TOP 8U
> > +#define OV9282_PIXEL_ARRAY_WIDTH 1280U
> > +#define OV9282_PIXEL_ARRAY_HEIGHT 800U
> > +
> > #define OV9282_REG_MIN 0x00
> > #define OV9282_REG_MAX 0xfffff
> >
> > @@ -118,6 +129,7 @@ struct ov9282_mode {
> > u32 vblank_min;
> > u32 vblank_max;
> > u32 link_freq_idx;
> > + struct v4l2_rect crop;
> > struct ov9282_reg_list reg_list;
> > };
> >
> > @@ -280,6 +292,16 @@ static const struct ov9282_mode supported_modes[] = {
> > .vblank_min = 41,
> > .vblank_max = 51540,
> > .link_freq_idx = 0,
> > + .crop = {
> > + /*
> > + * Note that this mode takes the top 720 lines from the
> > + * 800 of the sensor. It does not take a middle crop.
> > + */
> > + .left = OV9282_PIXEL_ARRAY_LEFT,
> > + .top = OV9282_PIXEL_ARRAY_TOP,
> > + .width = 1280,
> > + .height = 720
> > + },
> > .reg_list = {
> > .num_of_regs = ARRAY_SIZE(mode_1280x720_regs),
> > .regs = mode_1280x720_regs,
> > @@ -719,6 +741,58 @@ static int ov9282_init_pad_cfg(struct v4l2_subdev *sd,
> > return ov9282_set_pad_format(sd, sd_state, &fmt);
> > }
> >
> > +static const struct v4l2_rect *
> > +__ov9282_get_pad_crop(struct ov9282 *ov9282,
> > + struct v4l2_subdev_state *sd_state,
> > + unsigned int pad, enum v4l2_subdev_format_whence which)
> > +{
> > + switch (which) {
> > + case V4L2_SUBDEV_FORMAT_TRY:
> > + return v4l2_subdev_get_try_crop(&ov9282->sd, sd_state, pad);
> > + case V4L2_SUBDEV_FORMAT_ACTIVE:
> > + return &ov9282->cur_mode->crop;
> > + }
> > +
> > + return NULL;
> > +}
> > +
> > +static int ov9282_get_selection(struct v4l2_subdev *sd,
> > + struct v4l2_subdev_state *sd_state,
> > + struct v4l2_subdev_selection *sel)
> > +{
> > + switch (sel->target) {
> > + case V4L2_SEL_TGT_CROP: {
> > + struct ov9282 *ov9282 = to_ov9282(sd);
> > +
> > + mutex_lock(&ov9282->mutex);
>
> As there's no set_selection, do we need the mutex here ?
__ov9282_get_pad_crop is looking at the current mode, so the mutex is
against ov9282_set_pad_format changing the mode.
You'll find the same pattern in imx214, imx219, ov5640, ov5647,
ov8865, and hopefully all other sensor drivers implementing
get_selection for V4L2_SEL_TGT_CROP.
Dave
> > + sel->r = *__ov9282_get_pad_crop(ov9282, sd_state, sel->pad,
> > + sel->which);
> > + mutex_unlock(&ov9282->mutex);
> > +
> > + return 0;
> > + }
> > +
> > + case V4L2_SEL_TGT_NATIVE_SIZE:
> > + sel->r.top = 0;
> > + sel->r.left = 0;
> > + sel->r.width = OV9282_NATIVE_WIDTH;
> > + sel->r.height = OV9282_NATIVE_HEIGHT;
> > +
> > + return 0;
> > +
> > + case V4L2_SEL_TGT_CROP_DEFAULT:
> > + case V4L2_SEL_TGT_CROP_BOUNDS:
> > + sel->r.top = OV9282_PIXEL_ARRAY_TOP;
> > + sel->r.left = OV9282_PIXEL_ARRAY_LEFT;
> > + sel->r.width = OV9282_PIXEL_ARRAY_WIDTH;
> > + sel->r.height = OV9282_PIXEL_ARRAY_HEIGHT;
> > +
> > + return 0;
> > + }
> > +
> > + return -EINVAL;
> > +}
> > +
> > /**
> > * ov9282_start_streaming() - Start sensor stream
> > * @ov9282: pointer to ov9282 device
> > @@ -963,6 +1037,7 @@ static const struct v4l2_subdev_pad_ops ov9282_pad_ops = {
> > .enum_frame_size = ov9282_enum_frame_size,
> > .get_fmt = ov9282_get_pad_format,
> > .set_fmt = ov9282_set_pad_format,
> > + .get_selection = ov9282_get_selection,
> > };
> >
> > static const struct v4l2_subdev_ops ov9282_subdev_ops = {
> > --
> > 2.34.1
> >
