On Thu Mar 12 16:16:16 2026 -0700, Faizel K B wrote:
> Use the sensor's pre-calculated jiffies value to add appropriate
> delay between frames according to the configured timing value.
> The actual frame rate will vary depending on processing delays in
> other media pipeline components.
>
> Tested using yavta frame rate display with QCIF resolution:
> yavta <video-node> --capture=<no_of_frames>
>
> Signed-off-by: Faizel K B <[email protected]>
> Signed-off-by: Hans Verkuil <[email protected]>
Patch committed.
Thanks,
Hans Verkuil
drivers/media/test-drivers/vimc/vimc-streamer.c | 33 +++++++++++++++++++++++--
1 file changed, 31 insertions(+), 2 deletions(-)
---
diff --git a/drivers/media/test-drivers/vimc/vimc-streamer.c
b/drivers/media/test-drivers/vimc/vimc-streamer.c
index 15d863f97cbf..3ebf5798fa3d 100644
--- a/drivers/media/test-drivers/vimc/vimc-streamer.c
+++ b/drivers/media/test-drivers/vimc/vimc-streamer.c
@@ -139,6 +139,29 @@ static int vimc_streamer_pipeline_init(struct vimc_stream
*stream,
return -EINVAL;
}
+/**
+ * vimc_streamer_get_sensor() - Get sensor from pipeline
+ * @stream: the pipeline
+ *
+ * Helper function to find the sensor device in the pipeline.
+ * Returns pointer to sensor device or NULL if not found.
+ */
+static struct vimc_sensor_device *vimc_streamer_get_sensor(struct vimc_stream
*stream)
+{
+ int i;
+
+ for (i = 0; i < stream->pipe_size; i++) {
+ struct vimc_ent_device *ved = stream->ved_pipeline[i];
+
+ if (ved && ved->ent &&
+ ved->ent->function == MEDIA_ENT_F_CAM_SENSOR) {
+ return container_of(ved, struct vimc_sensor_device,
ved);
+ }
+ }
+
+ return NULL;
+}
+
/**
* vimc_streamer_thread - Process frames through the pipeline
*
@@ -154,25 +177,31 @@ static int vimc_streamer_pipeline_init(struct vimc_stream
*stream,
static int vimc_streamer_thread(void *data)
{
struct vimc_stream *stream = data;
+ struct vimc_sensor_device *vsensor;
u8 *frame = NULL;
int i;
+ unsigned long fps_jiffies;
+ const unsigned long default_jiffies = HZ / 30;
set_freezable();
+ vsensor = vimc_streamer_get_sensor(stream);
for (;;) {
try_to_freeze();
if (kthread_should_stop())
break;
+ /* Read from hardware configuration */
+ fps_jiffies = vsensor ? vsensor->hw.fps_jiffies :
default_jiffies;
+
for (i = stream->pipe_size - 1; i >= 0; i--) {
frame = stream->ved_pipeline[i]->process_frame(
stream->ved_pipeline[i], frame);
if (!frame || IS_ERR(frame))
break;
}
- //wait for 60hz
set_current_state(TASK_UNINTERRUPTIBLE);
- schedule_timeout(HZ / 60);
+ schedule_timeout(fps_jiffies);
}
return 0;
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