crypto: omap-des - use runtime_pm autosuspend for clock handling

Convert the driver to use autosuspend for runtime_pm. This boosts the
performance, and optimizes the power consumption for the driver. By
default, the timeout value for autosuspend is set to one second.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/omap-des.c

@@ -78,6 +78,8 @@
 #define FLAGS_INIT		BIT(4)
 #define FLAGS_BUSY		BIT(6)
 
+#define DEFAULT_AUTOSUSPEND_DELAY	1000
+
 struct omap_des_ctx {
 	struct omap_des_dev *dd;
 
@@ -506,8 +508,10 @@ static void omap_des_finish_req(struct omap_des_dev *dd, int err)
 
 	pr_debug("err: %d\n", err);
 
-	pm_runtime_put(dd->dev);
 	crypto_finalize_cipher_request(dd->engine, req, err);
+
+	pm_runtime_mark_last_busy(dd->dev);
+	pm_runtime_put_autosuspend(dd->dev);
 }
 
 static int omap_des_crypt_dma_stop(struct omap_des_dev *dd)
@@ -1044,8 +1048,10 @@ static int omap_des_probe(struct platform_device *pdev)
 	}
 	dd->phys_base = res->start;
 
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
+
 	pm_runtime_enable(dev);
-	pm_runtime_irq_safe(dev);
 	err = pm_runtime_get_sync(dev);
 	if (err < 0) {
 		pm_runtime_put_noidle(dev);