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media: ti: cal: use CSI-2 frame number for seq number

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The userspace needs a way to match received metadata buffers to pixel
data buffers. The obvious way to do this is to use the CSI-2 frame
number, as both the metadata and the pixel data have the same frame
number as they come from the same frame.

However, we don't have means to convey the frame number to userspace. We
do have the 'sequence' field, which with a few tricks can be used for
this purpose.

To achieve this, track the frame number for each virtual channel and
increase the sequence for each virtual channel by frame-number -
previous-frame-number, also taking into account the eventual wrap of the
CSI-2 frame number. If the CSI-2 peripheral does not support frame
numbers, CAL increases the frame number register by one each frame.

This way we get a monotonically increasing sequence number which is
common to all streams using the same virtual channel.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Tomi Valkeinen 2022-04-26 09:06:16 +02:00 committed by Mauro Carvalho Chehab
parent b1b93d36c3
commit ebdb28a55d
3 changed files with 62 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/media/platform/ti/cal/cal-camerarx.c
View File

@ -871,6 +871,7 @@ struct cal_camerarx *cal_camerarx_create(struct cal_dev *cal,
phy->cal = cal;
phy->instance = instance;
spin_lock_init(&phy->vc_lock);
mutex_init(&phy->mutex);
phy->res = platform_get_resource_byname(pdev, IORESOURCE_MEM,

57
drivers/media/platform/ti/cal/cal.c
View File

@ -543,7 +543,22 @@ void cal_ctx_unprepare(struct cal_ctx *ctx)
void cal_ctx_start(struct cal_ctx *ctx)
{
ctx->sequence = 0;
struct cal_camerarx *phy = ctx->phy;
/*
* Reset the frame number & sequence number, but only if the
* virtual channel is not already in use.
*/
spin_lock(&phy->vc_lock);
if (phy->vc_enable_count[ctx->vc]++ == 0) {
phy->vc_frame_number[ctx->vc] = 0;
phy->vc_sequence[ctx->vc] = 0;
}
spin_unlock(&phy->vc_lock);
ctx->dma.state = CAL_DMA_RUNNING;
/* Configure the CSI-2, pixel processing and write DMA contexts. */
@ -563,8 +578,15 @@ void cal_ctx_start(struct cal_ctx *ctx)
void cal_ctx_stop(struct cal_ctx *ctx)
{
struct cal_camerarx *phy = ctx->phy;
long timeout;
WARN_ON(phy->vc_enable_count[ctx->vc] == 0);
spin_lock(&phy->vc_lock);
phy->vc_enable_count[ctx->vc]--;
spin_unlock(&phy->vc_lock);
/*
* Request DMA stop and wait until it completes. If completion times
* out, forcefully disable the DMA.
@ -601,6 +623,34 @@ void cal_ctx_stop(struct cal_ctx *ctx)
* ------------------------------------------------------------------
*/
/*
* Track a sequence number for each virtual channel, which is shared by
* all contexts using the same virtual channel. This is done using the
* CSI-2 frame number as a base.
*/
static void cal_update_seq_number(struct cal_ctx *ctx)
{
struct cal_dev *cal = ctx->cal;
struct cal_camerarx *phy = ctx->phy;
u16 prev_frame_num, frame_num;
u8 vc = ctx->vc;
frame_num =
cal_read(cal, CAL_CSI2_STATUS(phy->instance, ctx->csi2_ctx)) &
0xffff;
if (phy->vc_frame_number[vc] != frame_num) {
prev_frame_num = phy->vc_frame_number[vc];
if (prev_frame_num >= frame_num)
phy->vc_sequence[vc] += 1;
else
phy->vc_sequence[vc] += frame_num - prev_frame_num;
phy->vc_frame_number[vc] = frame_num;
}
}
static inline void cal_irq_wdma_start(struct cal_ctx *ctx)
{
spin_lock(&ctx->dma.lock);
@ -631,6 +681,8 @@ static inline void cal_irq_wdma_start(struct cal_ctx *ctx)
}
spin_unlock(&ctx->dma.lock);
cal_update_seq_number(ctx);
}
static inline void cal_irq_wdma_end(struct cal_ctx *ctx)
@ -657,7 +709,8 @@ static inline void cal_irq_wdma_end(struct cal_ctx *ctx)
if (buf) {
buf->vb.vb2_buf.timestamp = ktime_get_ns();
buf->vb.field = ctx->v_fmt.fmt.pix.field;
buf->vb.sequence = ctx->sequence++;
buf->vb.sequence = ctx->phy->vc_sequence[ctx->vc];
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
}
}

7
drivers/media/platform/ti/cal/cal.h
View File

@ -180,6 +180,12 @@ struct cal_camerarx {
struct media_pad pads[CAL_CAMERARX_NUM_PADS];
struct v4l2_mbus_framefmt formats[CAL_CAMERARX_NUM_PADS];
/* protects the vc_* fields below */
spinlock_t vc_lock;
u8 vc_enable_count[4];
u16 vc_frame_number[4];
u32 vc_sequence[4];
/*
* Lock for camerarx ops. Protects:
* - formats
@ -242,7 +248,6 @@ struct cal_ctx {
const struct cal_format_info **active_fmt;
unsigned int num_active_fmt;
unsigned int sequence;
struct vb2_queue vb_vidq;
u8 dma_ctx;
u8 cport;