From: Amit Daniel Kachhap Date: Fri, 4 Jul 2014 21:40:23 +0000 (+0900) Subject: clocksource: exynos_mct: Register the timer for stable udelay X-Git-Tag: v3.16-rc5~3^2~4^2~1 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=8bf13a4346996b5a53d5f0c64b0914693c818fc2;p=linux.git clocksource: exynos_mct: Register the timer for stable udelay 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 Signed-off-by: Doug Anderson Signed-off-by: Kukjin Kim --- diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c index 5ce99c07ce8c..ab51bf20a3ed 100644 --- a/drivers/clocksource/exynos_mct.c +++ b/drivers/clocksource/exynos_mct.c @@ -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);