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Re: [PATCH 4/5] HSI: nokia-modem: drop support for disabled pm

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Hi,

On Sun, Jan 31, 2016 at 12:24:34PM +0100, Pali Rohár wrote:
> On Sunday 31 January 2016 02:19:46 Sebastian Reichel wrote:
> > Disabled power management means, that the driver can only be
> > used together with further out-of-tree kernel patches. There
> > is no reason to support this in the mainline kernel and not
> > having support for it means, that userspace can automatically
> > detect if we are running kernel based power management.
> 
> I'm against this change. It will break support for (patched) Maemo and 
> proprietary Nokia sscd modem daemon.

Do you have some links for this? So far my assumption was, that sscd
requires /sys/devices/platform/gpio-switch, so you either need to
patch sscd somehow, or patch the kernel to provide gpio-switch, or
provide some kind of userspace wrapper.

> Also you can export GPIOs manually via sysfs and touch that state. Which 
> means that you can do power management with mainline kernel even if you 
> set nokia-modem.pm=0.

Yeah... You export GPIOs manually. Did you actually try this? You
will end up with exactly the same result as nokia-modem.pm=1, just
with a few less symlinks. Also you have to make sure, that you
actually exported the right gpios, since the global gpio number is
dependent on the gpio-controller registration order.

> So please drop this patch.

Please provide facts, that Maemo can use pm=0 without additional
kernel patches and does not work with pm=1.

-- Sebastian

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[PATCH 0/5] nokia-modem: kernel based PM Sebastian Reichel <sre@kernel.org> - 2016-01-31 02:30 +0100
  [PATCH 4/5] HSI: nokia-modem: drop support for disabled pm Sebastian Reichel <sre@kernel.org> - 2016-01-31 02:30 +0100
    Re: [PATCH 4/5] HSI: nokia-modem: drop support for disabled pm Pali Rohár <pali.rohar@gmail.com> - 2016-01-31 12:30 +0100
      Re: [PATCH 4/5] HSI: nokia-modem: drop support for disabled pm Sebastian Reichel <sre@kernel.org> - 2016-01-31 17:20 +0100
        Re: [PATCH 4/5] HSI: nokia-modem: drop support for disabled pm Pali Rohár <pali.rohar@gmail.com> - 2016-02-08 10:00 +0100
  [PATCH 2/5] HSI: nokia-modem: kernel based PM Sebastian Reichel <sre@kernel.org> - 2016-01-31 02:30 +0100
    Re: [PATCH 2/5] HSI: nokia-modem: kernel based PM Pavel Machek <pavel@ucw.cz> - 2016-01-31 18:40 +0100
      Re: [PATCH 2/5] HSI: nokia-modem: kernel based PM Sebastian Reichel <sre@kernel.org> - 2016-01-31 19:10 +0100
        Re: [PATCH 2/5] HSI: nokia-modem: kernel based PM Pavel Machek <pavel@ucw.cz> - 2016-02-07 22:40 +0100

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