dmaengine: rcar-dmac: Make DMAC reinit during system resume explicit

The current (empty) system sleep callbacks rely on the PM core to force
a runtime resume to reinitialize the DMAC registers during system
resume.  Without a reinitialization, e.g. SCIF DMA will hang silently
after a system resume on R-Car Gen3.

Make this explicit by using pm_runtime_force_{suspend,resume}() as the
system sleep callbacks instead.  Use SET_LATE_SYSTEM_SLEEP_PM_OPS() as
DMA engines must be initialized before all DMA slave devices.

Fixes: 17218e0092f8 "PM / genpd: Stop/start devices without pm_runtime_force_suspend/resume()"
Suggested-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 7 insertions, 17 deletions

diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
index 2b2c7db3e480..35c3936edc45 100644
--- a/drivers/dma/sh/rcar-dmac.c
+++ b/drivers/dma/sh/rcar-dmac.c
@@ -1615,22 +1615,6 @@ static struct dma_chan *rcar_dmac_of_xlate(struct of_phandle_args *dma_spec,
  * Power management
  */
 
-#ifdef CONFIG_PM_SLEEP
-static int rcar_dmac_sleep_suspend(struct device *dev)
-{
-        /*
-         * TODO: Wait for the current transfer to complete and stop the device.
-         */
-        return 0;
-}
-
-static int rcar_dmac_sleep_resume(struct device *dev)
-{
-        /* TODO: Resume transfers, if any. */
-        return 0;
-}
-#endif
-
 #ifdef CONFIG_PM
 static int rcar_dmac_runtime_suspend(struct device *dev)
 {
@@ -1646,7 +1630,13 @@ static int rcar_dmac_runtime_resume(struct device *dev)
 #endif
 
 static const struct dev_pm_ops rcar_dmac_pm = {
-        SET_SYSTEM_SLEEP_PM_OPS(rcar_dmac_sleep_suspend, rcar_dmac_sleep_resume)
+        /*
+         * TODO for system sleep/resume:
+         *   - Wait for the current transfer to complete and stop the device,
+         *   - Resume transfers, if any.
+         */
+        SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+                                     pm_runtime_force_resume)
         SET_RUNTIME_PM_OPS(rcar_dmac_runtime_suspend, rcar_dmac_runtime_resume,
                            NULL)
 };