diff options
| author | Sebastien Jan <s-jan@ti.com> | 2012-01-02 18:32:59 +0800 |
|---|---|---|
| committer | Andy Green <andy.green@linaro.org> | 2012-01-02 18:32:59 +0800 |
| commit | ec81d9f0948a12218bbff00a80d117cf86757c4e (patch) | |
| tree | 816289c5b1c31cd4e03bdf97cc88a49689aa4c9c | |
| parent | 488d749ed636b767e95a52e3bd2b2a9c05e1fdd3 (diff) | |
hwspinlocks: disable runtime PM
On 3.1 kernel, rpm_idle takes 2.7ms when usage_count=0 (this function
runs under a spinlock with irqs disabled).
The root cause is not known yet, but this is clearly not expected and
is much shorter on 3.0 based kernel.
This causes x2 cpu-load and performances drop on a video decode
use-case using IVAHD (and syslink) on OMAP4. Disabling rpm brings back
load and performance figures in line with k3.0.
While the root-cause is not identified and fixed, keep runtime-pm
disabled for hwspinlocks.
Signed-off-by: Sebastien Jan <s-jan@ti.com>
| -rw-r--r-- | arch/arm/plat-omap/hwspinlock.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/arm/plat-omap/hwspinlock.c b/arch/arm/plat-omap/hwspinlock.c index 7cfe8774750..a33478f6735 100644 --- a/arch/arm/plat-omap/hwspinlock.c +++ b/arch/arm/plat-omap/hwspinlock.c @@ -288,7 +288,6 @@ static int __devinit hwspinlock_probe(struct platform_device *pdev) hwspinlocks[id].lock_reg = io_base + pdata-> lock_base_offset + sizeof(u32) * id; } - pm_runtime_enable(&pdev->dev); return 0; } |