diff options
| author | Tushar Behera <tushar.behera@linaro.org> | 2013-04-15 15:43:45 +0530 |
|---|---|---|
| committer | Tushar Behera <tushar.behera@linaro.org> | 2013-06-03 15:39:02 +0530 |
| commit | b87ff13c67f9015562cccda83037ba9effdb4e8f (patch) | |
| tree | c172ba131d1f6875252c44df73e4cc98d67a00be | |
| parent | ec130ba4144e93a7bb696a9b621bb69f6e709814 (diff) | |
ARM: EXYNOS: Set arch_sys_counter as default clocksource
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); } |