From 9ed9132402b92d1957927c8719f37d8b95bb00ff Mon Sep 17 00:00:00 2001
From: neocortex-vision <oss@neocortexvision.com>
Date: Thu, 28 Oct 2021 17:37:36 +0100
Subject: [PATCH] media: i2c: imx477: Add vsync trigger_mode parameter

trigger_mode == 0 (default) => no effect / no registers written
trigger_mode == 1           => source
trigger_mode == 2           => sink

This can be set e.g. in /boot/cmdline.txt as imx477.trigger_mode=N

Signed-off-by: Jonas Jacob <jonas.jacob@neocortexvision.com>
---
 drivers/media/i2c/imx477.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

--- a/drivers/media/i2c/imx477.c
+++ b/drivers/media/i2c/imx477.c
@@ -25,6 +25,10 @@ static int dpc_enable = 1;
 module_param(dpc_enable, int, 0644);
 MODULE_PARM_DESC(dpc_enable, "Enable on-sensor DPC");
 
+static int trigger_mode;
+module_param(trigger_mode, int, 0644);
+MODULE_PARM_DESC(trigger_mode, "Set vsync trigger mode: 1=source, 2=sink");
+
 #define IMX477_REG_VALUE_08BIT		1
 #define IMX477_REG_VALUE_16BIT		2
 
@@ -98,6 +102,12 @@ MODULE_PARM_DESC(dpc_enable, "Enable on-
 #define IMX477_TEST_PATTERN_B_DEFAULT	0
 #define IMX477_TEST_PATTERN_GB_DEFAULT	0
 
+/* Trigger mode */
+#define IMX477_REG_MC_MODE		0x3f0b
+#define IMX477_REG_MS_SEL		0x3041
+#define IMX477_REG_XVS_IO_CTRL		0x3040
+#define IMX477_REG_EXTOUT_EN		0x4b81
+
 /* Embedded metadata stream structure */
 #define IMX477_EMBEDDED_LINE_WIDTH 16384
 #define IMX477_NUM_EMBEDDED_LINES 1
@@ -1721,6 +1731,21 @@ static int imx477_start_streaming(struct
 	imx477_write_reg(imx477, 0x0b05, IMX477_REG_VALUE_08BIT, !!dpc_enable);
 	imx477_write_reg(imx477, 0x0b06, IMX477_REG_VALUE_08BIT, !!dpc_enable);
 
+	/* Set vsync trigger mode */
+	if (trigger_mode != 0) {
+		/* trigger_mode == 1 for source, 2 for sink */
+		const u32 val = (trigger_mode == 1) ? 1 : 0;
+
+		imx477_write_reg(imx477, IMX477_REG_MC_MODE,
+				 IMX477_REG_VALUE_08BIT, 1);
+		imx477_write_reg(imx477, IMX477_REG_MS_SEL,
+				 IMX477_REG_VALUE_08BIT, val);
+		imx477_write_reg(imx477, IMX477_REG_XVS_IO_CTRL,
+				 IMX477_REG_VALUE_08BIT, val);
+		imx477_write_reg(imx477, IMX477_REG_EXTOUT_EN,
+				 IMX477_REG_VALUE_08BIT, val);
+	}
+
 	/* Apply customized values from user */
 	ret =  __v4l2_ctrl_handler_setup(imx477->sd.ctrl_handler);
 	if (ret)