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clocksource: exynos_mct: Register the timer for stable udelay

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This patch registers the exynos mct clocksource as the current timer
as it has constant clock rate. This will generate correct udelay for
the exynos platform and avoid using unnecessary calibrated
jiffies. This change has been tested on exynos5420 based board and
udelay is very close to expected.

Without this patch udelay() on exynos5400 / exynos5800 is wildly
inaccurate due to big.LITTLE not adjusting loops_per_jiffy correctly.
Also without this patch udelay() on exynos5250 can be innacruate
during transitions between frequencies < 800 MHz (you'll go 200 MHz ->
800 MHz -> 300 MHz and will run at 800 MHz for a time with the wrong
loops_per_jiffy).

[dianders: reworked and created version 3]

Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Amit Daniel Kachhap 2014-07-05 06:40:23 +09:00 committed by Kukjin Kim
parent 89e6a13b88
commit 8bf13a4346
1 changed files with 11 additions and 0 deletions
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11
drivers/clocksource/exynos_mct.c
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@ -200,10 +200,21 @@ static u64 notrace exynos4_read_sched_clock(void)
return _exynos4_frc_read();
}
static struct delay_timer exynos4_delay_timer;
static cycles_t exynos4_read_current_timer(void)
{
return _exynos4_frc_read();
}
static void __init exynos4_clocksource_init(void)
{
exynos4_mct_frc_start();
exynos4_delay_timer.read_current_timer = &exynos4_read_current_timer;
exynos4_delay_timer.freq = clk_rate;
register_current_timer_delay(&exynos4_delay_timer);
if (clocksource_register_hz(&mct_frc, clk_rate))
panic("%s: can't register clocksource\n", mct_frc.name);