diff options
| author | Richard Woodruff <r-woodruff2@ti.com> | 2008-07-03 12:24:30 +0300 |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2008-07-03 12:24:30 +0300 |
| commit | 3fddd09e59cf49dc339e2de74d31a76c1f7f172f (patch) | |
| tree | 2c3ebae6e34d0becf0f4e4b9fe11db70c7275a42 /arch/arm/mach-omap2 | |
| parent | 0f0d0807093d2d72ee772a1b4ba1d0b088a79a2b (diff) | |
ARM: OMAP: DMTimer: Optimize by adding load and start
This patch optimizes the timer load and start sequence. By combining the
load and start a needless posted wait can be removed from the system timer
execution path.
* Before patch register writes are taking up .078% @ 500MHz during idle.
Address |total |min |max |avr |count|ratio%
old\process\default_idle|7.369s |0.0us|999.902ms|14.477ms|509. |62.661%
ld\Global\cpu_v7_do_idle|4.265s |0.0us|375.786ms|24.374ms|175. |36.270%
(UNKNOWN)|17.503ms|0.us|531.080us|5.119us|3419. |0.148%
r\omap_dm_timer_set_load|8.135ms|0.0us|79.887us|15.065us|540. |0.069% <--
\vmlinux-old\Global\_end|2.023ms|0.0us|4.000us|0.560us|3613. |0.017%
-old\Global\__raw_readsw|1.962ms|0.0us|108.610us|9.167us|214. |0.016%
old\smc91x\smc_interrupt|1.353ms|0.0us|10.212us|2.348us|576. |0.011%
s/namei\__link_path_walk|1.161ms|0.0us|4.310us|0.762us| 1524. |0.009%
\omap_dm_timer_write_reg|1.085ms|0.0us|126.150us|2.153us|504. |0.009% <--
* After patch timer functions do not show up in top listings for long captures.
Signed-off-by: Richard Woodruff <r-woodruff2@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/mach-omap2')
| -rw-r--r-- | arch/arm/mach-omap2/timer-gp.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/arch/arm/mach-omap2/timer-gp.c b/arch/arm/mach-omap2/timer-gp.c index 78d05f203fff..557603f99313 100644 --- a/arch/arm/mach-omap2/timer-gp.c +++ b/arch/arm/mach-omap2/timer-gp.c @@ -59,8 +59,7 @@ static struct irqaction omap2_gp_timer_irq = { static int omap2_gp_timer_set_next_event(unsigned long cycles, struct clock_event_device *evt) { - omap_dm_timer_set_load(gptimer, 0, 0xffffffff - cycles); - omap_dm_timer_start(gptimer); + omap_dm_timer_set_load_start(gptimer, 0, 0xffffffff - cycles); return 0; } @@ -77,8 +76,7 @@ static void omap2_gp_timer_set_mode(enum clock_event_mode mode, period = clk_get_rate(omap_dm_timer_get_fclk(gptimer)) / HZ; period -= 1; - omap_dm_timer_set_load(gptimer, 1, 0xffffffff - period); - omap_dm_timer_start(gptimer); + omap_dm_timer_set_load_start(gptimer, 1, 0xffffffff - period); break; case CLOCK_EVT_MODE_ONESHOT: break; @@ -172,8 +170,7 @@ static void __init omap2_gp_clocksource_init(void) tick_rate = clk_get_rate(omap_dm_timer_get_fclk(gpt)); tick_period = (tick_rate / HZ) - 1; - omap_dm_timer_set_load(gpt, 1, 0); - omap_dm_timer_start(gpt); + omap_dm_timer_set_load_start(gpt, 1, 0); clocksource_gpt.mult = clocksource_khz2mult(tick_rate/1000, clocksource_gpt.shift); |