media: rcar-vin: Add support for V4L2_FIELD_SEQ_{TB,BT}

The hardware does not support capturing the field types
V4L2_FIELD_SEQ_TB and V4L2_FIELD_SEQ_BT. To capture in these formats the
driver needs to adjust the offset of the capture buffer and capture
twice to each vb2 buffer.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h b/drivers/media/platform/rcar-vin/rcar-vin.h
index 0aa904a4af5b..c19d077ce1cb 100644
--- a/drivers/media/platform/rcar-vin/rcar-vin.h
+++ b/drivers/media/platform/rcar-vin/rcar-vin.h
@@ -61,6 +61,23 @@ enum rvin_dma_state {
 };
 
 /**
+ * enum rvin_buffer_type
+ *
+ * Describes how a buffer is given to the hardware. To be able
+ * to capture SEQ_TB/BT it's needed to capture to the same vb2
+ * buffer twice so the type of buffer needs to be kept.
+ *
+ * FULL - One capture fills the whole vb2 buffer
+ * HALF_TOP - One capture fills the top half of the vb2 buffer
+ * HALF_BOTTOM - One capture fills the bottom half of the vb2 buffer
+ */
+enum rvin_buffer_type {
+	FULL,
+	HALF_TOP,
+	HALF_BOTTOM,
+};
+
+/**
  * struct rvin_video_format - Data format stored in memory
  * @fourcc:	Pixelformat
  * @bpp:	Bytes per pixel
@@ -206,6 +223,8 @@ struct rvin_dev {
 	spinlock_t qlock;
 	struct {
 		struct vb2_v4l2_buffer *buffer;
+		enum rvin_buffer_type type;
+		dma_addr_t phys;
 	} buf_hw[HW_BUFFER_NUM];
 	struct list_head buf_list;
 	unsigned int sequence;