[PATCH v2] i2c: imx-lpi2c: change to PIO mode in system-wide suspend/resume progress

[Daniel Baluta]

On Thu, Nov 20, 2025 at 12:31 PM Carlos Song <carlos.song at nxp.com> wrote:
>
> EDMA resume is in early stage and suspend is in late stage, but LPI2C
> resume and suspend are in NOIRQ stage. So LPI2C resource become ready
> earlier than EDMA. When IRQ enabled, immediately slave will trigger LPI2C
> to read data and the length meets the requirements for DMA usage, the DMA
> will be needed at this time. Within a very small time window, EDMA is
> still not resumed.
>
> If a system-wide suspend or resume transition is in progress. LPI2C should
> use PIO to transfer data not DMA to avoid issue caused by not ready DMA HW
> resource.
>
> Fixes: a09c8b3f9047 ("i2c: imx-lpi2c: add eDMA mode support for LPI2C")
> Signed-off-by: Carlos Song <carlos.song at nxp.com>
> ---

For future patches please add here a small description of what changed since v1:
e.g

Changes since v1:
* updated commit message as per discussion with Frank.