HSI: omap_ssi_core: remove pm_runtime_get_sync call from tasklet

We may not call pm_runtime_get_sync() from tasklet, since
it can block once pm_runtime_irq_safe is removed for omap-ssi.

Since irq can should only be created for a running device,
we assume, that the device is already running and use non-
synchronous API instead.
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Tested-by: Pavel Machek <pavel@ucw.cz>

drivers/hsi/controllers/omap_ssi_core.c

@@ -255,7 +255,13 @@ static void ssi_gdd_tasklet(unsigned long dev)
 	unsigned int lch;
 	u32 status_reg;
 
-	pm_runtime_get_sync(ssi->device.parent);
+	pm_runtime_get(ssi->device.parent);
+
+	if (!pm_runtime_active(ssi->device.parent)) {
+		dev_warn(ssi->device.parent, "ssi_gdd_tasklet called without runtime PM!\n");
+		pm_runtime_put(ssi->device.parent);
+		return;
+	}
 
 	status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);
 	for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) {