Re: stable: 2124b72e6283c4e84a55e71077fee91793f4c801 need backport

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On Tue, Oct 29, 2013 at 1:52 AM, Kamal Mostafa <kamal@xxxxxxxxxxxxx> wrote:
>> > On Wed, 2013-10-16 at 14:15 +0800, Shuduo Sang wrote:
>> >> I hope at least 3.8 stable tree would like to backport this patch
>> >> since the patch be merged into v3.9-rc5 and v3.8 is used widely. Loop
>> >> kernel-team@xxxxxxxxxxxxxxxx.
>
>> On Thu, Oct 17, 2013 at 11:58 PM, Kamal Mostafa <kamal@xxxxxxxxxxxxx>
>> wrote:
>> >
>> >  but that commit says:
>> >
>> >     This fixes problems caused by the following commit:
>> >       commit d6dd9eb1d96d2b7345fe4664066c2b7ed86da898
>> >       Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
>> >       Date:   Tue Jan 29 16:35:20 2013 -0200
>> >            drm/i915: dynamic Haswell display power well support
>> >
>> > But 3.8-stable doesn't include d6dd9eb.   Is 2124b72 actually necessary
>> > in 3.8?  (Or at least, would it actually be useful?)
>
> On Mon, 2013-10-21 at 20:05 +0800, Shuduo Sang wrote:
>> I think so. Thanks.
>
> After looking at it more closely, I'm pretty sure that this commit
> (2124b72) just isn't relevant for 3.8-stable ...
>
> In 3.8, the i915 power wells simply all get enabled by
> intel_init_power_wells() and nothing ever tries to disable them.  This
> commit commit tries to modify the routine intel_set_power_well() which
> takes a boolean 'enable' param to enable or disable a power well -- but
> that routine doesn't exist in 3.8 (it was added to i915 later).
>
> So, if I understand the commit description and the code correctly, 3.8
> doesn't doesn't need and couldn't make use of a "disable_power_well"
> override boot parameter.
>
> If you still think it would be useful for 3.8-stable, please explain why
> and supply a backport of the patch.
>

Thanks for your explaining. I will try to port it.

> Thanks,
>
>  -Kamal
>
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