The adv7180 produces 1 to 2 frames of garbage before proper sync is
established. This allows V4L2 drivers and apps to skip those.
Signed-off-by: Tim Harvey <tharvey@xxxxxxxxxxxxx>
---
drivers/media/i2c/adv7180.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
index 99697ba..6f3dc88 100644
--- a/drivers/media/i2c/adv7180.c
+++ b/drivers/media/i2c/adv7180.c
@@ -180,6 +180,9 @@
#define V4L2_CID_ADV_FAST_SWITCH (V4L2_CID_USER_ADV7180_BASE + 0x00)
+/* Initial number of frames to skip to avoid possible garbage */
+#define ADV7180_NUM_OF_SKIP_FRAMES 2
+
struct adv7180_state;
#define ADV7180_FLAG_RESET_POWERED BIT(0)
@@ -769,6 +772,13 @@ static int adv7180_g_mbus_config(struct v4l2_subdev *sd,
return 0;
}
+static int adv7180_get_skip_frames(struct v4l2_subdev *sd, u32 *frames)
+{
+ *frames = ADV7180_NUM_OF_SKIP_FRAMES;
+
+ return 0;
+}
+
static int adv7180_g_pixelaspect(struct v4l2_subdev *sd, struct v4l2_fract *aspect)
{
struct adv7180_state *state = to_state(sd);
@@ -849,10 +859,15 @@ static const struct v4l2_subdev_pad_ops adv7180_pad_ops = {
.get_fmt = adv7180_get_pad_format,
};
+static const struct v4l2_subdev_sensor_ops adv7180_sensor_ops = {
+ .g_skip_frames = adv7180_get_skip_frames,
+};
+
static const struct v4l2_subdev_ops adv7180_ops = {
.core = &adv7180_core_ops,
.video = &adv7180_video_ops,
.pad = &adv7180_pad_ops,
+ .sensor = &adv7180_sensor_ops,
};
static irqreturn_t adv7180_irq(int irq, void *devid)
--
2.7.4
