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[ Upstream commit35c3f72a2d] Prior to commitd935187cfb("remoteproc: mediatek: Break lock dependency to prepare_lock"), `scp->clk` was prepared and enabled only when it needs to communicate with the SCP. The commitd935187cfbmoved the prepare operation to remoteproc's prepare(), keeping the clock prepared as long as the SCP is running. The power consumption due to the prolonged clock preparation can be negligible when the system is running, as SCP is designed to be a very power efficient processor. However, the clock remains prepared even when the system enters system suspend. This prevents the underlying clock controller (and potentially the parent PLLs) from shutting down, which increases power consumption and may block the system from entering deep sleep states. Add suspend and resume callbacks. Unprepare the clock in suspend() if it was active and re-prepare it in resume() to ensure the clock is properly disabled during system suspend, while maintaining the "always prepared" semantics while the system is active. The driver doesn't implement .attach() callback, hence it only checks for RPROC_RUNNING. Fixes:d935187cfb("remoteproc: mediatek: Break lock dependency to prepare_lock") Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org> Link: https://lore.kernel.org/r/20260206033034.3031781-1-tzungbi@kernel.org Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>