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| 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 /include | |
| parent | ARM: OMAP: DMTimer: Use posted mode (diff) | |
| download | linux-dev-3fddd09e59cf49dc339e2de74d31a76c1f7f172f.tar.xz linux-dev-3fddd09e59cf49dc339e2de74d31a76c1f7f172f.zip | |
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 'include')
| -rw-r--r-- | include/asm-arm/arch-omap/dmtimer.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-arm/arch-omap/dmtimer.h b/include/asm-arm/arch-omap/dmtimer.h index fefb276ed402..02b29e8437ae 100644 --- a/include/asm-arm/arch-omap/dmtimer.h +++ b/include/asm-arm/arch-omap/dmtimer.h @@ -66,6 +66,7 @@ void omap_dm_timer_stop(struct omap_dm_timer *timer); void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source); void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, unsigned int value); +void omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload, unsigned int value); void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, unsigned int match); void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, int toggle, int trigger); void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler); |