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

Calling runtime PM API at the cra_init/exit is bad for power management
purposes, as the lifetime for a CRA can be very long. Instead, use
pm_runtime autosuspend approach for handling the device clocks. Clocks
are enabled when they are actually required, and autosuspend disables
these if they have not been used for a sufficiently long time period.
By default, the timeout value is 1 second.

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

diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
index 3483ab6..f2aae4a 100644 (file)
--- a/drivers/crypto/omap-aes.c
+++ b/drivers/crypto/omap-aes.c
@@ -86,6 +86,8 @@
 #define AES_REG_IRQ_DATA_OUT           BIT(2)
 #define DEFAULT_TIMEOUT                (5*HZ)
 
+#define DEFAULT_AUTOSUSPEND_DELAY      1000
+
 #define FLAGS_MODE_MASK                0x000f
 #define FLAGS_ENCRYPT          BIT(0)
 #define FLAGS_CBC              BIT(1)
@@ -239,11 +241,19 @@ static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset,
 
 static int omap_aes_hw_init(struct omap_aes_dev *dd)
 {
+       int err;
+
        if (!(dd->flags & FLAGS_INIT)) {
                dd->flags |= FLAGS_INIT;
                dd->err = 0;
        }
 
+       err = pm_runtime_get_sync(dd->dev);
+       if (err < 0) {
+               dev_err(dd->dev, "failed to get sync: %d\n", err);
+               return err;
+       }
+
        return 0;
 }
 
@@ -521,6 +531,9 @@ static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
        pr_debug("err: %d\n", err);
 
        crypto_finalize_cipher_request(dd->engine, req, err);
+
+       pm_runtime_mark_last_busy(dd->dev);
+       pm_runtime_put_autosuspend(dd->dev);
 }
 
 static int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
@@ -762,23 +775,6 @@ static int omap_aes_ctr_decrypt(struct ablkcipher_request *req)
 
 static int omap_aes_cra_init(struct crypto_tfm *tfm)
 {
-       struct omap_aes_dev *dd = NULL;
-       int err;
-
-       /* Find AES device, currently picks the first device */
-       spin_lock_bh(&list_lock);
-       list_for_each_entry(dd, &dev_list, list) {
-               break;
-       }
-       spin_unlock_bh(&list_lock);
-
-       err = pm_runtime_get_sync(dd->dev);
-       if (err < 0) {
-               dev_err(dd->dev, "%s: failed to get_sync(%d)\n",
-                       __func__, err);
-               return err;
-       }
-
        tfm->crt_ablkcipher.reqsize = sizeof(struct omap_aes_reqctx);
 
        return 0;
@@ -786,16 +782,6 @@ static int omap_aes_cra_init(struct crypto_tfm *tfm)
 
 static void omap_aes_cra_exit(struct crypto_tfm *tfm)
 {
-       struct omap_aes_dev *dd = NULL;
-
-       /* Find AES device, currently picks the first device */
-       spin_lock_bh(&list_lock);
-       list_for_each_entry(dd, &dev_list, list) {
-               break;
-       }
-       spin_unlock_bh(&list_lock);
-
-       pm_runtime_put_sync(dd->dev);
 }
 
 /* ********************** ALGS ************************************ */
@@ -1141,6 +1127,9 @@ static int omap_aes_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);
        err = pm_runtime_get_sync(dev);
        if (err < 0) {