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clocksource/drivers/timer-ti-dm: Do not update counter on updating the period

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Write to trigger register(OMAP_TIMER_TRIGGER_REG) will load the value
in Load register(OMAP_TIMER_LOAD_REG) into Counter register
(OMAP_TIMER_COUNTER_REG).

omap_dm_timer_set_load() writes into trigger register every time load
register is updated. When timer is configured in pwm mode, this causes
disruption in current pwm cycle, which is not expected especially when
pwm is used as PPS signal for synchronized PTP clocks. So do not write
into trigger register on updating the period.

Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200305082715.15861-5-lokeshvutla@ti.com
This commit is contained in:
Lokesh Vutla 2020-03-05 13:57:13 +05:30 committed by Daniel Lezcano
parent b34677b099
commit aff7665dc6
1 changed files with 0 additions and 1 deletions
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drivers/clocksource/timer-ti-dm.c
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@ -579,7 +579,6 @@ static int omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
omap_dm_timer_disable(timer);
return 0;
}