From f303b455bb95233297c179b525a851a792e469b2 Mon Sep 17 00:00:00 2001 From: Tero Kristo Date: Thu, 4 Aug 2016 13:28:42 +0300 Subject: 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 Signed-off-by: Herbert Xu --- drivers/crypto/omap-aes.c | 43 ++++++++++++++++--------------------------- 1 file changed, 16 insertions(+), 27 deletions(-) (limited to 'drivers/crypto/omap-aes.c') diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c index 3483ab66b1ca..f2aae4a3cbcc 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 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) { -- cgit v1.2.1