[PATCH v2 3/3] remoteproc: imx_dsp_rproc: Wait for suspend ACK only if WAIT_FW_CONFIRMATION is set

[Daniel Baluta]

On Thu, Dec 4, 2025 at 2:29 PM Iuliana Prodan (OSS)
<iuliana.prodan at oss.nxp.com> wrote:
>
> From: Iuliana Prodan <iuliana.prodan at nxp.com>
>
> The DSP suspend path currently waits unconditionally for a suspend ack
> from the firmware. This breaks firmwares that do not implement the
> mailbox-based CONFIRMATION handshake, as the DSP never responds and
> system suspend fails with -EBUSY.
>
> The driver already uses the WAIT_FW_CONFIRMATION flag to indicate that
> the firmware supports the CONFIRMATION handshake at boot. Apply the same
> logic during suspend: only send the suspend message and wait for the
> suspend ack when the firmware is expected to support it.
>
> Signed-off-by: Iuliana Prodan <iuliana.prodan at nxp.com>

Reviewed-by: Daniel Baluta <daniel.baluta at nxp.com>