[PATCH v2 18/21] staging: media: tegra-video: add hooks for planar YUV and H/V flip

Luca Ceresoli
2022-11-28T15:28:31Z

Tegra20 supports planar YUV422 capture, which can be implemented by writing
U and V base address registers in addition to the "main" base buffer
address register.

It also supports H and V flip, which among others requires to write the
start address (i.e. the 1st offset to write, at the end of the buffer or
line) in more registers for Y and, for planar formats, U and V.

Add minimal hooks in VI to allow per-SoC optional support to those
features:

- variables in struct tegra_vi for the U and V buffer base offsets
- variables in struct tegra_vi for the Y, U and V buffer start offsets
- an optional per-soc VI operation to compute those values on queue setup

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

---

No changes in v2
---
drivers/staging/media/tegra-video/vi.c | 4 ++++
drivers/staging/media/tegra-video/vi.h | 14 ++++++++++++++
2 files changed, 18 insertions(+)

diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c
index 854ffb4b5617..ebb502a45e96 100644
--- a/drivers/staging/media/tegra-video/vi.c
+++ b/drivers/staging/media/tegra-video/vi.c
@@ -92,6 +92,7 @@ tegra_get_format_by_fourcc(struct tegra_vi *vi, u32 fourcc)
/*
* videobuf2 queue operations
*/
+
static int tegra_channel_queue_setup(struct vb2_queue *vq,
unsigned int *nbuffers,
unsigned int *nplanes,
@@ -107,6 +108,9 @@ static int tegra_channel_queue_setup(struct vb2_queue *vq,
sizes[0] = chan->format.sizeimage;
alloc_devs[0] = chan->vi->dev;

+ if (chan->vi->ops->channel_queue_setup)
+ chan->vi->ops->channel_queue_setup(chan);
+
return 0;
}

diff --git a/drivers/staging/media/tegra-video/vi.h b/drivers/staging/media/tegra-video/vi.h
index ba563cd17296..a23ee8800d33 100644
--- a/drivers/staging/media/tegra-video/vi.h
+++ b/drivers/staging/media/tegra-video/vi.h
@@ -47,6 +47,7 @@ struct tegra_vi_channel;
* @channel_host1x_syncpt_free: free all synchronization points
* @vi_fmt_align: modify `pix` to fit the hardware alignment
* requirements and fill image geometry
+ * @channel_queue_setup: additional operations at the end of vb2_ops::queue_setup
* @vi_start_streaming: starts media pipeline, subdevice streaming, sets up
* VI for capture and runs capture start and capture finish
* kthreads for capturing frames to buffer and returns them back.
@@ -58,6 +59,7 @@ struct tegra_vi_ops {
int (*channel_host1x_syncpt_init)(struct tegra_vi_channel *chan);
void (*channel_host1x_syncpt_free)(struct tegra_vi_channel *chan);
void (*vi_fmt_align)(struct v4l2_pix_format *pix, unsigned int bpp);
+ void (*channel_queue_setup)(struct tegra_vi_channel *chan);
int (*vi_start_streaming)(struct vb2_queue *vq, u32 count);
void (*vi_stop_streaming)(struct vb2_queue *vq);
};
@@ -148,6 +150,12 @@ struct tegra_vi {
* @queue: vb2 buffers queue
* @sequence: V4L2 buffers sequence number
*
+ * @addr_offset_u: U plane base address, relative to buffer base address (only for planar)
+ * @addr_offset_v: V plane base address, relative to buffer base address (only for planar)
+ * @start_offset: 1st Y byte to write, relative to buffer base address (for H/V flip)
+ * @start_offset_u: 1st U byte to write, relative to buffer base address (for H/V flip)
+ * @start_offset_v: 1st V byte to write, relative to buffer base address (for H/V flip)
+ *
* @capture: list of queued buffers for capture
* @start_lock: protects the capture queued list
* @done: list of capture done queued buffers
@@ -188,6 +196,12 @@ struct tegra_vi_channel {
struct vb2_queue queue;
u32 sequence;

+ unsigned int addr_offset_u;
+ unsigned int addr_offset_v;
+ unsigned int start_offset;
+ unsigned int start_offset_u;
+ unsigned int start_offset_v;
+
struct list_head capture;
/* protects the capture queued list */
spinlock_t start_lock;
--
2.34.1