In fast switch mode the adv7180 (and similar) can lock onto a new signal
faster when switching between different inputs. As a downside though it is
no longer able to auto-detect the incoming format.
The fast switch mode is exposed as a boolean v4l control that allows
userspace applications to either enable or disable fast switch mode.
Signed-off-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
--
Changes since v1:
* Reserve private control range and use it for the fast switch control
* Changed control name from "Fast switch" to "Fast Switch"
---
drivers/media/i2c/adv7180.c | 29 +++++++++++++++++++++++++++++
include/uapi/linux/v4l2-controls.h | 4 ++++
2 files changed, 33 insertions(+)
diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
index 4d789c7..ee73b29 100644
--- a/drivers/media/i2c/adv7180.c
+++ b/drivers/media/i2c/adv7180.c
@@ -127,6 +127,9 @@
#define ADV7180_REG_VPP_SLAVE_ADDR 0xFD
#define ADV7180_REG_CSI_SLAVE_ADDR 0xFE
+#define ADV7180_REG_FLCONTROL 0x40e0
+#define ADV7180_FLCONTROL_FL_ENABLE 0x1
+
#define ADV7180_CSI_REG_PWRDN 0x00
#define ADV7180_CSI_PWRDN 0x80
@@ -164,6 +167,8 @@
#define ADV7180_DEFAULT_CSI_I2C_ADDR 0x44
#define ADV7180_DEFAULT_VPP_I2C_ADDR 0x42
+#define V4L2_CID_ADV_FAST_SWITCH (V4L2_CID_USER_ADV7180_BASE + 0x00)
+
struct adv7180_state;
#define ADV7180_FLAG_RESET_POWERED BIT(0)
@@ -509,6 +514,18 @@ static int adv7180_s_ctrl(struct v4l2_ctrl *ctrl)
break;
ret = adv7180_write(state, ADV7180_REG_SD_SAT_CR, val);
break;
+ case V4L2_CID_ADV_FAST_SWITCH:
+ if (ctrl->val) {
+ /* ADI required write */
+ adv7180_write(state, 0x80d9, 0x44);
+ adv7180_write(state, ADV7180_REG_FLCONTROL,
+ ADV7180_FLCONTROL_FL_ENABLE);
+ } else {
+ /* ADI required write */
+ adv7180_write(state, 0x80d9, 0xc4);
+ adv7180_write(state, ADV7180_REG_FLCONTROL, 0x00);
+ }
+ break;
default:
ret = -EINVAL;
}
@@ -521,6 +538,16 @@ static const struct v4l2_ctrl_ops adv7180_ctrl_ops = {
.s_ctrl = adv7180_s_ctrl,
};
+static const struct v4l2_ctrl_config adv7180_ctrl_fast_switch = {
+ .ops = &adv7180_ctrl_ops,
+ .id = V4L2_CID_ADV_FAST_SWITCH,
+ .name = "Fast Switching",
+ .type = V4L2_CTRL_TYPE_BOOLEAN,
+ .min = 0,
+ .max = 1,
+ .step = 1,
+};
+
static int adv7180_init_controls(struct adv7180_state *state)
{
v4l2_ctrl_handler_init(&state->ctrl_hdl, 4);
@@ -537,6 +564,8 @@ static int adv7180_init_controls(struct adv7180_state *state)
v4l2_ctrl_new_std(&state->ctrl_hdl, &adv7180_ctrl_ops,
V4L2_CID_HUE, ADV7180_HUE_MIN,
ADV7180_HUE_MAX, 1, ADV7180_HUE_DEF);
+ v4l2_ctrl_new_custom(&state->ctrl_hdl, &adv7180_ctrl_fast_switch, NULL);
+
state->sd.ctrl_handler = &state->ctrl_hdl;
if (state->ctrl_hdl.error) {
int err = state->ctrl_hdl.error;
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 661f119..9f6e108 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -170,6 +170,10 @@ enum v4l2_colorfx {
* We reserve 16 controls for this driver. */
#define V4L2_CID_USER_SAA7134_BASE (V4L2_CID_USER_BASE + 0x1060)
+/* The base for the adv7180 driver controls.
+ * We reserve 16 controls for this driver. */
+#define V4L2_CID_USER_ADV7180_BASE (V4L2_CID_USER_BASE + 0x1070)
+
/* MPEG-class control IDs */
/* The MPEG controls are applicable to all codec controls
* and the 'MPEG' part of the define is historical */
--
1.8.0
--
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