Re: [PATCH v5] i2c: imx: mark I2C adapter when hardware is powered down

[Oleksij Rempel]

On Mon, May 25, 2026 at 11:04:00AM +0800, 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: 358025ac091e ("i2c: imx: make controller available until system suspend_noirq() and from resume_noirq()")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Carlos Song <carlos.song@xxxxxxx>

Acked-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>

Thank you!

Best Regards,
Oleksij
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