Re: [PATCH v7 0/2] media: i2c: imx412: power on timing adjust

[Wenmeng Liu <wenmeng.liu@oss.qualcomm.com>]

On 1/23/2026 5:19 PM, Wenmeng Liu wrote:
> 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 v7:
> - Add vendor details to the comments. -- Sakari
> - Link to v6: https://lore.kernel.org/r/20260122-imx412-v6-0-2c0b54594c2a@oss.qualcomm.com
> 
> Changes in v6:
> - Added comments for the modifications. -- Sakari
> - Link to v5: https://lore.kernel.org/r/20260121-imx412-v5-0-be67654a4afe@oss.qualcomm.com
> 
> Changes in v5:
> - Assert reset GPIO in imx412_parse_hw_config. -- Tarang
> - Link to v4: https://lore.kernel.org/r/20260121-imx412-v4-0-f6bdf83f116b@oss.qualcomm.com
> 
> 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: Assert reset GPIO during probe
>        media: i2c: imx412: Extend the power-on waiting time
> 
>   drivers/media/i2c/imx412.c | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)
> ---
> base-commit: e3b32dcb9f23e3c3927ef3eec6a5842a988fb574
> change-id: 20260119-imx412-d6710b9fd3c6
> 
> Best regards,

Gentle reminder.

Thanks,
Wenmeng