[PATCH 21/21] media: ipu6: Support upstream sub-devices without get_frame_desc()

[Sakari Ailus <sakari.ailus@linux.intel.com>]

Provide compatibility support for upstream sub-device drivers that do not
implement get_frame_desc() pad op.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/media/pci/intel/ipu6/ipu6-isys-csi2.c | 30 ++++++++++++++++---
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/drivers/media/pci/intel/ipu6/ipu6-isys-csi2.c b/drivers/media/pci/intel/ipu6/ipu6-isys-csi2.c
index 780ac3c4d4e4..bf70482029dd 100644
--- a/drivers/media/pci/intel/ipu6/ipu6-isys-csi2.c
+++ b/drivers/media/pci/intel/ipu6/ipu6-isys-csi2.c
@@ -16,6 +16,7 @@
 #include <linux/string_choices.h>
 
 #include <media/media-entity.h>
+#include <media/mipi-csi2.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-event.h>
@@ -589,6 +590,29 @@ static bool ipu6_isys_csi2_streaming_change(struct ipu6_isys_subdev *asd,
 	return false;
 }
 
+static int ipu6_isys_get_frame_desc(struct v4l2_subdev *remote_sd,
+				    unsigned int pad,
+				    struct v4l2_mbus_frame_desc *desc)
+{
+	struct v4l2_subdev_format fmt = { .which = V4L2_SUBDEV_FORMAT_ACTIVE };
+	int ret;
+
+	ret = v4l2_subdev_call(remote_sd, pad, get_frame_desc, pad, desc);
+	if (!ret || ret != -ENOIOCTLCMD)
+		return ret;
+
+	ret = v4l2_subdev_call_state_active(remote_sd, pad, get_fmt, &fmt);
+	if (ret)
+		return ret;
+
+	desc->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
+	desc->num_entries = 1;
+	desc->entry[0].pixelcode = fmt.format.code;
+	desc->entry[0].bus.csi2.dt = ipu6_isys_mbus_code_to_mipi(fmt.format.code);
+
+	return 0;
+}
+
 static int ipu6_isys_csi2_enable_streams(struct v4l2_subdev *sd,
 					 struct v4l2_subdev_state *state,
 					 u32 pad, u64 streams_mask)
@@ -612,8 +636,7 @@ static int ipu6_isys_csi2_enable_streams(struct v4l2_subdev *sd,
 
 	lockdep_assert_held(&csi2->isys->stream_mutex);
 
-	ret = v4l2_subdev_call(remote_sd, pad, get_frame_desc,
-			       remote_pad->index, &desc);
+	ret = ipu6_isys_get_frame_desc(remote_sd, remote_pad->index, &desc);
 	if (ret)
 		return ret;
 
@@ -715,8 +738,7 @@ static int ipu6_isys_csi2_disable_streams(struct v4l2_subdev *sd,
 
 	lockdep_assert_held(&csi2->isys->stream_mutex);
 
-	ret = v4l2_subdev_call(remote_sd, pad, get_frame_desc,
-			       remote_pad->index, &desc);
+	ret = ipu6_isys_get_frame_desc(remote_sd, remote_pad->index, &desc);
 	if (ret)
 		return ret;
 
-- 
2.47.3