[PATCH] pwm: sun4i: Avoid waiting until the next period

[Uwe Kleine-König]

Hello Emil,

On Wed, May 12, 2021 at 02:55:26AM +0200, Emil Lenngren wrote:
> Well that's one way of "solving it" ;)
> 
> But on what hardware do you really need to wait until one full pulse
> cycle ends, before a disable command takes effect?
> 
> On the hardware I've tested on (GR8 and V3s), it's enough to wait at
> most two clock cycles in order for it to take effect before we can
> close the gate. And with clock cycle I mean 24 MHz divided by the
> prescaler. With prescaler 1, that's 84 nanoseconds. By closing the
> gate when the pwm should be disabled, I guess we could save some
> nanoampere or microampere (is this important?)

If I understood correctly you really have to wait longer to achieve that
the output is inactive in the disabled state. Do you talk about the same
thing?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |
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