Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1238048

Re: [PATCH v8 3/4] PM / sleep: Go direct_complete if driver has no callbacks

Show all headers | View raw

On 2 October 2015 at 10:10, Tomeu Vizoso <tomeu.vizoso@collabora.com> wrote:
> On 2 October 2015 at 09:48, Ulf Hansson <ulf.hansson@linaro.org> wrote:
>> On 2 October 2015 at 09:14, Tomeu Vizoso <tomeu.vizoso@collabora.com> wrote:
>>> If a suitable prepare callback cannot be found for a given device and
>>> its driver has no PM callbacks at all, assume that it can go direct to
>>> complete when the system goes to sleep.
>>>
>>> The reason for this is that there's lots of devices in a system that do
>>> no PM at all and there's no reason for them to prevent their ancestors
>>> to do direct_complete if they can support it.
>>>
>>> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
>>> ---
>>>
>>> Changes in v8:
>>> - Move no_pm_callbacks field into CONFIG_PM_SLEEP
>>> - Call device_check_pm_callbacks only after a device is bound or unbound
>>
>> Devices that don't use a driver, will not get this feature for "free".
>> I expect in those cases, they will have to call
>> device_check_pm_callbacks() themselves, right?
>
> You are right, but wonder if we shouldn't go back to calling
> device_check_pm_callbacks() from device_pm_add() and
> dev_pm_domain_set() so they don't have to.

That seems reasonable to me, and I didn't quite understand why you
decided to remove it. :-)

Kind regards
Uffe

[...]
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH v8 0/4] Allow USB devices to remain runtime-suspended when sleeping Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-02 09:20 +0200
  [PATCH v8 3/4] PM / sleep: Go direct_complete if driver has no callbacks Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-02 09:20 +0200
    Re: [PATCH v8 3/4] PM / sleep: Go direct_complete if driver has no callbacks Ulf Hansson <ulf.hansson@linaro.org> - 2015-10-02 09:50 +0200
      Re: [PATCH v8 3/4] PM / sleep: Go direct_complete if driver has no callbacks Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-02 10:20 +0200
        Re: [PATCH v8 3/4] PM / sleep: Go direct_complete if driver has no callbacks Ulf Hansson <ulf.hansson@linaro.org> - 2015-10-02 10:50 +0200
          Re: [PATCH v8 3/4] PM / sleep: Go direct_complete if driver has no callbacks "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-10-02 15:20 +0200
            Re: [PATCH v8 3/4] PM / sleep: Go direct_complete if driver has no callbacks Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-05 14:30 +0200
  [PATCH v8 2/4] PM / Domains: add setter for dev.pm_domain Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-02 09:20 +0200
  [PATCH v8 4/4] USB / PM: Allow USB devices to remain runtime-suspended when sleeping Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-02 09:20 +0200

csiph-web