linux-kernel - [PATCH] media: i2c: dw9714: Fix occasional probe errors

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Date: Sat, 17 Feb 2024 19:49:11 +0100
From: Ondřej Jirman <megi@....cz>
To: linux-kernel@...r.kernel.org
Cc: Ondrej Jirman <megi@....cz>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	linux-media@...r.kernel.org (open list:V4L2 LENS DRIVERS)
Subject: [PATCH] media: i2c: dw9714: Fix occasional probe errors

From: Ondrej Jirman <megi@....cz>

The powerup delay was not observed during probe, leading to occasional
I2C communication failures in RPM suspend callback. Power delay is
properly observed in resume callback already.

Signed-off-by: Ondrej Jirman <megi@....cz>
---
 drivers/media/i2c/dw9714.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/i2c/dw9714.c b/drivers/media/i2c/dw9714.c
index cc09b32ede60..84d29bcf0ccd 100644
--- a/drivers/media/i2c/dw9714.c
+++ b/drivers/media/i2c/dw9714.c
@@ -157,6 +157,8 @@ static int dw9714_probe(struct i2c_client *client)
 		return rval;
 	}
 
+	usleep_range(1000, 2000);
+
 	v4l2_i2c_subdev_init(&dw9714_dev->sd, client, &dw9714_ops);
 	dw9714_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
 				V4L2_SUBDEV_FL_HAS_EVENTS;
-- 
2.43.0