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
--- 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 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 @@
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_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 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 @@
}
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) {