From e4f97762829cc7152056e3f147e1114b2b57dfad Mon Sep 17 00:00:00 2001
From: Ben Benson <ben.benson@raspberrypi.com>
Date: Fri, 21 Jul 2023 15:59:51 +0100
Subject: [PATCH] drivers: media: imx296: Updated imx296 driver for external
 trigger

Updated imx296 driver to support external trigger mode via XTR pin.
Added module parameter to control this mode.

Signed-off-by: Ben Benson <ben.benson@raspberrypi.com>
---
 drivers/media/i2c/imx296.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/media/i2c/imx296.c b/drivers/media/i2c/imx296.c
index 467332d12400c0..85bd035ba9538a 100644
--- a/drivers/media/i2c/imx296.c
+++ b/drivers/media/i2c/imx296.c
@@ -20,6 +20,10 @@
 #include <media/v4l2-fwnode.h>
 #include <media/v4l2-subdev.h>
 
+static int trigger_mode;
+module_param(trigger_mode, int, 0644);
+MODULE_PARM_DESC(trigger_mode, "Set trigger mode: 0=default, 1=XTRIG");
+
 #define IMX296_PIXEL_ARRAY_WIDTH			1456
 #define IMX296_PIXEL_ARRAY_HEIGHT			1088
 
@@ -578,6 +582,12 @@ static int imx296_stream_on(struct imx296 *sensor)
 
 	imx296_write(sensor, IMX296_CTRL00, 0, &ret);
 	usleep_range(2000, 5000);
+
+	if (trigger_mode == 1) {
+		imx296_write(sensor, IMX296_CTRL0B, IMX296_CTRL0B_TRIGEN, &ret);
+		imx296_write(sensor, IMX296_LOWLAGTRG,  IMX296_LOWLAGTRG_FAST, &ret);
+	}
+
 	imx296_write(sensor, IMX296_CTRL0A, 0, &ret);
 
 	return ret;