[media] V4L: mx2_camera: .try_fmt shouldn't fail

If the user is requesting too large a frame, instead of failing
select an acceptable geometry, preserving the requested aspect ratio.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/mx2_camera.c b/drivers/media/video/mx2_camera.c
index e05e800..55d4844 100644 (file)
--- a/drivers/media/video/mx2_camera.c
+++ b/drivers/media/video/mx2_camera.c
@@ -973,11 +973,16 @@ static int mx2_camera_try_fmt(struct soc_camera_device *icd,
                if (pix->bytesperline < 0)
                        return pix->bytesperline;
                pix->sizeimage = pix->height * pix->bytesperline;
-               if (pix->sizeimage > (4 * 0x3ffff)) { /* CSIRXCNT limit */
-                       dev_warn(icd->dev.parent,
-                                       "Image size (%u) above limit\n",
-                                       pix->sizeimage);
-                       return -EINVAL;
+               /* Check against the CSIRXCNT limit */
+               if (pix->sizeimage > 4 * 0x3ffff) {
+                       /* Adjust geometry, preserve aspect ratio */
+                       unsigned int new_height = int_sqrt(4 * 0x3ffff *
+                                       pix->height / pix->bytesperline);
+                       pix->width = new_height * pix->width / pix->height;
+                       pix->height = new_height;
+                       pix->bytesperline = soc_mbus_bytes_per_line(pix->width,
+                                                       xlate->host_fmt);
+                       BUG_ON(pix->bytesperline < 0);
                }
        }