[PATCH v2 17/21] [media] imx-ipuv3-csi: support downsizing

[Philipp Zabel]

Add support for the CSI internal horizontal and vertical downsizing.

Signed-off-by: Philipp Zabel <p.za...@pengutronix.de>
---
Changes since v1:
 - Rebased onto CSI changes.
---
 drivers/media/platform/imx/imx-ipuv3-csi.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/media/platform/imx/imx-ipuv3-csi.c 
b/drivers/media/platform/imx/imx-ipuv3-csi.c
index 7837978..c65f02c 100644
--- a/drivers/media/platform/imx/imx-ipuv3-csi.c
+++ b/drivers/media/platform/imx/imx-ipuv3-csi.c
@@ -175,8 +175,14 @@ static int ipucsi_subdev_set_format(struct v4l2_subdev *sd,
        } else {
                struct v4l2_mbus_framefmt *infmt = &ipucsi->format_mbus[0];
 
-               width = infmt->width;
-               height = infmt->height;
+               if (sdformat->format.width < (infmt->width * 3 / 4))
+                       width = infmt->width / 2;
+               else
+                       width = infmt->width;
+               if (sdformat->format.height < (infmt->height * 3 / 4))
+                       height = infmt->height / 2;
+               else
+                       height = infmt->height;
                mbusformat->field = infmt->field;
                mbusformat->colorspace = infmt->colorspace;
        }
@@ -237,14 +243,14 @@ static int ipucsi_subdev_s_stream(struct v4l2_subdev *sd, 
int enable)
                window.width = fmt[0].width;
                window.height = fmt[0].height;
                ipu_csi_set_window(ipucsi->csi, &window);
+               ipu_csi_set_downsize(ipucsi->csi,
+                                    fmt[0].width == 2 * fmt[1].width,
+                                    fmt[0].height == 2 * fmt[1].height);
 
                /* Is CSI data source MCT (MIPI)? */
                mux_mct = (mbus_config.type == V4L2_MBUS_CSI2);
-
                ipu_set_csi_src_mux(ipucsi->ipu, ipucsi->id, mux_mct);
-               if (mux_mct)
-                       ipu_csi_set_mipi_datatype(ipucsi->csi, /*VC*/ 0,
-                                                 &fmt[0]);
+               ipu_csi_set_mipi_datatype(ipucsi->csi, /*VC*/ 0, &fmt[0]);
 
                ret = ipu_csi_init_interface(ipucsi->csi, &mbus_config,
                                             &fmt[0]);
-- 
2.9.3

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