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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>
This commit is contained in:
Tero Kristo 2016-06-22 16:23:34 +03:00 committed by Herbert Xu
parent 3c4b23901a
commit e93f767bec
1 changed files with 7 additions and 1 deletions
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8
drivers/crypto/omap-sham.c
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@ -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);