From: Sven Van Asbroeck <thesven73@gmail.com>
To: Clemens Gruber <clemens.gruber@pqgruber.com>
Cc: "Matthias Schiffer" <matthias.schiffer@ew.tq-group.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Thierry Reding" <thierry.reding@gmail.com>,
linux-pwm@vger.kernel.org,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"Andy Shevchenko" <andy.shevchenko@gmail.com>
Subject: Re: (EXT) Re: [PATCH 1/4] pwm: pca9685: remove unused duty_cycle struct element
Date: Fri, 3 Apr 2020 19:50:07 -0400 [thread overview]
Message-ID: <CAGngYiUe-tihBJUcXQ738_5aA9pzgp_-NSs4iCrz3eWO6rMukA@mail.gmail.com> (raw)
In-Reply-To: <20200330151231.GA1650@workstation.tuxnet>
On Mon, Mar 30, 2020 at 11:12 AM Clemens Gruber
<clemens.gruber@pqgruber.com> wrote:
>
> On Wed, Feb 26, 2020 at 06:03:02PM +0100, Matthias Schiffer wrote:
> > As it turns out, this driver is broken in yet another way I didn't find
> > before: For changing the global prescaler the chip needs to be put into
> > sleep mode, but the driver doesn't follow the restart sequence
> > described in the datasheet when waking it back up. In consequence,
> > changing the period of one PWM does not only modify the period of all
> > PWMs (which is bad enough, but can't be avoided with this hardware),
> > but it also leaves all PWMs disabled...
>
> I am unable to reproduce this: If I set a specific duty cycle on a
> channel and then change the period, the channel stays active.
> I can see the brightness of an LED decrease if I increase the period.
What happens when pwm channels 0 and 1 are both enabled, and
you change the pwm period of channel 0. Does channel 1 remain
on?
next prev parent reply other threads:[~2020-04-03 23:50 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-26 13:52 [PATCH 1/4] pwm: pca9685: remove unused duty_cycle struct element Matthias Schiffer
2020-02-26 13:52 ` [PATCH 2/4] pwm: pca9685: remove ALL_LED PWM channel Matthias Schiffer
2020-03-30 13:07 ` Thierry Reding
2020-03-30 13:15 ` Thierry Reding
2020-03-30 13:19 ` Andy Shevchenko
2020-03-30 15:38 ` Thierry Reding
2020-03-30 13:34 ` Clemens Gruber
2020-03-30 15:40 ` Thierry Reding
2020-03-30 15:43 ` Thierry Reding
2020-03-30 16:07 ` Clemens Gruber
2020-03-31 12:09 ` (EXT) " Matthias Schiffer
2020-03-31 13:14 ` Clemens Gruber
2020-02-26 13:52 ` [PATCH 3/4] pwm: pca9685: initialize all LED registers during probe Matthias Schiffer
2020-02-26 15:00 ` Uwe Kleine-König
2020-02-26 16:13 ` (EXT) " Matthias Schiffer
2020-03-30 13:07 ` Thierry Reding
2020-02-26 13:52 ` [PATCH 4/4] pwm: pca9685: migrate config/enable/disable to apply Matthias Schiffer
2020-02-26 15:05 ` Uwe Kleine-König
2020-02-26 15:10 ` [PATCH 1/4] pwm: pca9685: remove unused duty_cycle struct element Uwe Kleine-König
2020-02-26 17:03 ` (EXT) " Matthias Schiffer
2020-02-26 19:21 ` Uwe Kleine-König
2020-02-28 13:26 ` (EXT) " Matthias Schiffer
2020-03-30 15:12 ` Clemens Gruber
2020-04-03 23:50 ` Sven Van Asbroeck [this message]
2020-04-04 17:35 ` Clemens Gruber
2020-04-04 20:17 ` Sven Van Asbroeck
2020-04-06 9:51 ` Thierry Reding
2020-04-07 13:00 ` (EXT) " Matthias Schiffer
2020-04-09 11:42 ` Sven Van Asbroeck
2020-04-03 23:47 ` Sven Van Asbroeck
2020-04-07 14:46 ` (EXT) " Matthias Schiffer
2020-04-08 8:00 ` Matthias Schiffer
2020-03-30 13:07 ` Thierry Reding
2020-03-30 13:18 ` Andy Shevchenko
2020-03-30 16:02 ` Thierry Reding
2020-03-30 16:10 ` Clemens Gruber
2020-04-01 16:36 ` Clemens Gruber
2020-04-01 17:45 ` Thierry Reding
2020-04-02 7:10 ` (EXT) " Matthias Schiffer
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