media: atomisp: report the visible resolution

The atomisp sensors and logic adds an extra pad lines/columns,
called "dvs envelope". It also uses an extra 12 lines/columns
at the sensor for BYT.

As those are not visible to userspace, the V4L2 API should
decrement such values when reporting the current resolution.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/staging/media/atomisp/pci/atomisp_ioctl.c b/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
index 8f0a9a6..d92d41d 100644 (file)
--- a/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
@@ -876,6 +876,20 @@ static int atomisp_g_fmt_cap(struct file *file, void *fh,
                v4l2_fill_pix_format(&f->fmt.pix, &fmt.format);
 
                f->fmt.pix.pixelformat = fmtdesc.pixelformat;
+
+               /*
+                * HACK: The atomisp does something different here, as it
+                * seems to set the sensor to a slightly higher resolution than
+                * the visible ones. That seems to be needed by atomisp's ISP
+                * in order to properly handle the frames. So, s_fmt adds 16
+                * extra columns/lines. See atomisp_subdev_set_selection().
+                *
+                * Yet, the V4L2 userspace API doesn't expect those, so it
+                * needs to be decremented when reporting the visible
+                * resolution to userspace.
+                */
+               f->fmt.pix.width -= pad_w;
+               f->fmt.pix.height -= pad_h;
        }
 
        depth = atomisp_get_pixel_depth(f->fmt.pix.pixelformat);