linux-kernel - [PATCH v4 0/2] media: i2c: imx412: power on timing adjust

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Message-Id: <20260121-imx412-v4-0-f6bdf83f116b@oss.qualcomm.com>
Date: Wed, 21 Jan 2026 16:06:26 +0800
From: Wenmeng Liu <wenmeng.liu@....qualcomm.com>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wenmeng Liu <wenmeng.liu@....qualcomm.com>
Subject: [PATCH v4 0/2] media: i2c: imx412: power on timing adjust

This series of patches mainly addresses two issues:
1. Fix potential timing issues that may occur during the first and second power on.
If the reset GPIO happens to default to the deasserted state at the very
first power-up, the previous sequence could let the sensor run before
supplies/clock are fully stable, while subsequent power cycles would
differ because the driver explicitly toggles reset. This results in
inconsistent power on sequences between the first and later power on.

2. The Arducam IMX577 sensor requires a longer reset time.

Changes in v4:
- Add assert reset in probe. -- Sakari
- Link to v3: https://lore.kernel.org/r/20260119-imx412-v3-0-8b46929af773@oss.qualcomm.com
Changes in v3:
- Fix power on timing. -- Bryan.
- Add reset delay time for Arducam Imx577.
- Link to v2: https://lore.kernel.org/all/20260109044913.3310-1-wenmeng.liu@oss.qualcomm.com/

Changes in v2:
- Move the 7.4–8 ms delay before mode-register programming to satisfy T7 (NVM read).
- Link to v1: https://lore.kernel.org/all/20251222-imx412-v1-1-51c7e724b376@oss.qualcomm.com/

---
Wenmeng Liu (2):
      media: i2c: imx412: fix sensor power-on timing
      media: i2c: imx412: Extend the power-on waiting time

 drivers/media/i2c/imx412.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
base-commit: 053966c344dbd346e71305f530e91ea77916189f
change-id: 20260119-imx412-d6710b9fd3c6

Best regards,
-- 
Wenmeng <wenmeng.liu@....qualcomm.com>