diff options
| author | Tero Kristo <t-kristo@ti.com> | 2016-06-22 16:23:34 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2016-06-24 16:24:57 +0300 |
| commit | e93f767bec1c4b58ac24bd59143c0030b9555426 (patch) | |
| tree | 14a837de9cbcd2d2665dfa34f21126bcfb4d7f6f /drivers/crypto/omap-sham.c | |
| parent | 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 (diff) | |
| download | linux-e93f767bec1c4b58ac24bd59143c0030b9555426.tar.xz | |
crypto: omap-sham - use runtime_pm autosuspend for clock handling
Calling runtime PM API for every block causes serious performance hit to
crypto operations that are done on a long buffer. As crypto is performed
on a page boundary, encrypting large buffers can cause a series of crypto
operations divided by page. The runtime PM API is also called those many
times.
Convert the driver to use runtime_pm autosuspend instead, with a default
timeout value of 1 second. This results in upto ~50% speedup.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/omap-sham.c')
| -rw-r--r-- | drivers/crypto/omap-sham.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c index 63464e86f2b1..887bc32b7993 100644 --- a/drivers/crypto/omap-sham.c +++ b/drivers/crypto/omap-sham.c @@ -100,6 +100,8 @@ #define DEFAULT_TIMEOUT_INTERVAL HZ +#define DEFAULT_AUTOSUSPEND_DELAY 1000 + /* mostly device flags */ #define FLAGS_BUSY 0 #define FLAGS_FINAL 1 @@ -999,7 +1001,8 @@ static void omap_sham_finish_req(struct ahash_request *req, int err) dd->flags &= ~(BIT(FLAGS_BUSY) | BIT(FLAGS_FINAL) | BIT(FLAGS_CPU) | BIT(FLAGS_DMA_READY) | BIT(FLAGS_OUTPUT_READY)); - pm_runtime_put(dd->dev); + pm_runtime_mark_last_busy(dd->dev); + pm_runtime_put_autosuspend(dd->dev); if (req->base.complete) req->base.complete(&req->base, err); @@ -1946,6 +1949,9 @@ static int omap_sham_probe(struct platform_device *pdev) dd->flags |= dd->pdata->flags; + pm_runtime_use_autosuspend(dev); + pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY); + pm_runtime_enable(dev); pm_runtime_irq_safe(dev); |