trigger_mode == -1 (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

Tested on HQ cameras (XVS <-> XVS, GND <-> GND) with libcamera.

Signed-off-by: Jonas Jacob <jonas.jacob@neocortexvision.com>

drivers/media/i2c/imx477.c

@@ -25,7 +25,7 @@ static int dpc_enable = 1;
 module_param(dpc_enable, int, 0644);
 MODULE_PARM_DESC(dpc_enable, "Enable on-sensor DPC");
 
-static int trigger_mode = 0;
+static int trigger_mode = -1;
 module_param(trigger_mode, int, 0644);
 MODULE_PARM_DESC(trigger_mode, "Set vsync trigger mode: 1=source, 2=sink");
 
@@ -1730,18 +1730,18 @@ static int imx477_start_streaming(struct imx477 *imx477)
 	imx477_write_reg(imx477, 0x0b06, IMX477_REG_VALUE_08BIT, !!dpc_enable);
 
 	/* Set vsync trigger mode */
-	if (trigger_mode != 0) {
+	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_REG_VALUE_08BIT, 1);
 		imx477_write_reg(imx477, IMX477_REG_MS_SEL,
-			IMX477_REG_VALUE_08BIT, val);
+				 IMX477_REG_VALUE_08BIT, val);
 		imx477_write_reg(imx477, IMX477_REG_XVS_IO_CTRL,
-			IMX477_REG_VALUE_08BIT, val);
+				 IMX477_REG_VALUE_08BIT, val);
 		imx477_write_reg(imx477, IMX477_REG_EXTOUT_EN,
-			IMX477_REG_VALUE_08BIT, val);
+				 IMX477_REG_VALUE_08BIT, val);
 	}
 
 	/* Apply customized values from user */