Re: [PATCH v3] i2c: imx-lpi2c: mark I2C adapter when hardware is powered down

[Mukesh Savaliya]

On 5/25/2026 8:44 AM, Carlos Song (OSS) wrote:
> From: Carlos Song <carlos.song@xxxxxxx>
>
> On some i.MX platforms, certain I2C client drivers keep a periodic
> workqueue which continues to trigger I2C transfers.
>
> During system suspend/resume, there exists a time window between:
>    - suspend_noirq and the system entering suspend
>    - the system starting to resume and resume_noirq
>
> In this window, the I2C controller resources such as clock and pinctrl
> may already be disabled or not yet restored.
>
> If a workqueue triggers an I2C transfer in this period, the driver
> attempts to access I2C registers while the hardware resources are
> unavailable, which may lead to system hang.
>
> Mark the I2C adapter as suspended during noirq suspend and block new
> transfers until resume, ensuring that I2C transfers are only issued
> when hardware resources are available.
>
> Fixes: 1ee867e465c1 ("i2c: imx-lpi2c: add target mode support")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Carlos Song <carlos.song@xxxxxxx>
> ---

Acked-by: Mukesh Savaliya <mukesh.savaliya@xxxxxxxxxxxxxxxx>