linux-kernel - [PATCH 3/4] media: i2c: vd55g1: Setup sensor external clock before patching

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Message-ID: <20250609-fix_vd55g1-v1-3-594f1134e3fb@foss.st.com>
Date: Mon, 9 Jun 2025 15:46:23 +0200
From: Benjamin Mugnier <benjamin.mugnier@...s.st.com>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Sylvain Petinot
	<sylvain.petinot@...s.st.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
CC: <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Benjamin
 Mugnier <benjamin.mugnier@...s.st.com>
Subject: [PATCH 3/4] media: i2c: vd55g1: Setup sensor external clock before
 patching

Proper clock configuration is required to advance through FSM states.
Prior than this having a different clock value than default sensor's
value was used (12 MHz) could prevent the sensor from booting.

Signed-off-by: Benjamin Mugnier <benjamin.mugnier@...s.st.com>
---
 drivers/media/i2c/vd55g1.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/vd55g1.c b/drivers/media/i2c/vd55g1.c
index 336dc3c85ac9e695f22aa524e0df6138dc76e45c..dec6e3e231d54a742bdd08ff2a506c152bb89429 100644
--- a/drivers/media/i2c/vd55g1.c
+++ b/drivers/media/i2c/vd55g1.c
@@ -1038,8 +1038,6 @@ static int vd55g1_enable_streams(struct v4l2_subdev *sd,
 	if (ret < 0)
 		return ret;
 
-	vd55g1_write(sensor, VD55G1_REG_EXT_CLOCK, sensor->xclk_freq, &ret);
-
 	/* Configure output */
 	vd55g1_write(sensor, VD55G1_REG_MIPI_DATA_RATE,
 		     sensor->mipi_rate, &ret);
@@ -1613,6 +1611,9 @@ static int vd55g1_power_on(struct device *dev)
 		goto disable_clock;
 	}
 
+	/* Setup clock now to advance through system FSM states */
+	vd55g1_write(sensor, VD55G1_REG_EXT_CLOCK, sensor->xclk_freq, &ret);
+
 	ret = vd55g1_patch(sensor);
 	if (ret) {
 		dev_err(dev, "Sensor patch failed %d\n", ret);

-- 
2.25.1