linux-kernel - [PATCH 3/5] media: i2c: alvium: enable acquisition frame rate

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Date: Tue, 16 Apr 2024 16:19:03 +0200
From: Tommaso Merciai <tomm.merciai@...il.com>
To: 
Cc: martin.hecht@...et.eu,
	michael.roeder@...et.eu,
	tomm.merciai@...il.com,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] media: i2c: alvium: enable acquisition frame rate

Alvium camera by default is in free running mode. Datasheet say that
acquisition frame rate reg can only be used if frame start trigger
mode is set to off.
Enable r/w aquisition frame rate and turn off trigger mode.

Signed-off-by: Tommaso Merciai <tomm.merciai@...il.com>
---
 drivers/media/i2c/alvium-csi2.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/media/i2c/alvium-csi2.c b/drivers/media/i2c/alvium-csi2.c
index 991b3bcc8b80..2ab4c7e563d2 100644
--- a/drivers/media/i2c/alvium-csi2.c
+++ b/drivers/media/i2c/alvium-csi2.c
@@ -1184,6 +1184,20 @@ static int alvium_set_frame_rate(struct alvium_dev *alvium, u64 fr)
 	struct device *dev = &alvium->i2c_client->dev;
 	int ret;
 
+	ret = alvium_write_hshake(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_EN_RW,
+				  1);
+	if (ret) {
+		dev_err(dev, "Fail to set acquisition frame rate enable reg\n");
+		return ret;
+	}
+
+	ret = alvium_write_hshake(alvium, REG_BCRM_FRAME_START_TRIGGER_MODE_RW,
+				  0);
+	if (ret) {
+		dev_err(dev, "Fail to set frame start trigger mode reg\n");
+		return ret;
+	}
+
 	ret = alvium_write_hshake(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_RW,
 				  fr);
 	if (ret) {
-- 
2.34.1