diff options
| author | Tushar Behera <tushar.behera@linaro.org> | 2013-04-15 15:43:45 +0530 |
|---|---|---|
| committer | Andrey Konovalov <andrey.konovalov@linaro.org> | 2013-06-18 01:24:44 +0400 |
| commit | 86c08fa921a5839399bd13d23c535fde2e086c5a (patch) | |
| tree | a1e30c0f6304881beccbcfd6049ccfc2c58b58e2 | |
| parent | 32a0a54987cb4ada1715eba62a4c8f15a08db224 (diff) | |
ARM: EXYNOS: Set arch_sys_counter as default clocksourcetracking-arndale-rt-linaro-preempt-rt-20130618.0tracking-arndale-rt-linaro-no-preempt-rt-20130625.0
The Exynos 5250 includes an architected timer which is on core and
very cheap to read.
Enabling the architected timer can lead to a significant performance
improvement for timer sensitive workloads such as TCP/IP.
It turns out that both arch_sys_counter and mct-frc have a rating of
400. On bootup, arch_sys_counter is initialized first then the
clocksource changes to mct-frc when that initialises later on.
If the rating of mct-frc is reduced below 400, then arch_sys_counter
becomes the default.
Suggested-by: Steve Capper <steve.capper@linaro.org>
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
| -rw-r--r-- | arch/arm/mach-exynos/mct.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/mach-exynos/mct.c b/arch/arm/mach-exynos/mct.c index 6cb48f5d67c2..c957b4fd01b0 100644 --- a/arch/arm/mach-exynos/mct.c +++ b/arch/arm/mach-exynos/mct.c @@ -161,6 +161,10 @@ static void __init exynos4_clocksource_init(void) { exynos4_mct_frc_start(0, 0); + if (soc_is_exynos5250()) { + mct_frc.rating = 399; + } + if (clocksource_register_hz(&mct_frc, clk_rate)) panic("%s: can't register clocksource\n", mct_frc.name); } |