[PATCH 18/22] [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>
---
 drivers/media/platform/imx/imx-ipuv3-csi.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/media/platform/imx/imx-ipuv3-csi.c 
b/drivers/media/platform/imx/imx-ipuv3-csi.c
index 699460e6..e8a6a7b 100644
--- a/drivers/media/platform/imx/imx-ipuv3-csi.c
+++ b/drivers/media/platform/imx/imx-ipuv3-csi.c
@@ -167,8 +167,16 @@ static int ipucsi_subdev_set_format(struct v4l2_subdev *sd,
                width = clamp_t(unsigned int, sdformat->format.width, 16, 8192);
                height = clamp_t(unsigned int, sdformat->format.height, 16, 
4096);
        } else {
-               width = ipucsi->format_mbus[0].width;
-               height = ipucsi->format_mbus[0].height;
+               if (sdformat->format.width <
+                   (ipucsi->format_mbus[0].width * 3 / 4))
+                       width = ipucsi->format_mbus[0].width / 2;
+               else
+                       width = ipucsi->format_mbus[0].width;
+               if (sdformat->format.height <
+                   (ipucsi->format_mbus[0].height * 3 / 4))
+                       height = ipucsi->format_mbus[0].height / 2;
+               else
+                       height = ipucsi->format_mbus[0].height;
        }
 
        mbusformat = __ipucsi_get_pad_format(sd, cfg, sdformat->pad,
@@ -212,14 +220,14 @@ 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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