From: Jani Nikula <jani.nikula@linux.intel.com>
To: Daniel Vetter <daniel@ffwll.ch>, Siva Chandra <sivachandra@google.com>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH] drm/i915: Add a DRM property "psr"
Date: Wed, 19 Mar 2014 17:32:34 +0200 [thread overview]
Message-ID: <877g7qxkz1.fsf@intel.com> (raw)
In-Reply-To: <20140319084438.GM30571@phenom.ffwll.local>
On Wed, 19 Mar 2014, Daniel Vetter <daniel@ffwll.ch> wrote:
> On Tue, Mar 18, 2014 at 01:53:56PM -0700, Siva Chandra wrote:
>> On Tue, Mar 18, 2014 at 1:06 PM, Jesse Barnes <jbarnes@virtuousgeek.org> wrote:
>> > On Tue, 18 Mar 2014 12:51:07 -0700
>> > Siva Chandra <sivachandra@chromium.org> wrote:
>> >
>> >> This property helps one turn PSR "on" and "off" via xrandr.
>> >> The default value is same as that of the module param i915.enable_psr.
>> >>
>> >> Signed-off-by: Siva Chandra <sivachandra@google.com>
>> >> ---
>> >
>> > So are you using this in Chromium for disabling PSR in cases where it
>> > doesn't work? Or to optimize power consumption when the kernel driver
>> > gets it wrong? Or just for debug?
>>
>> We are testing a few PSR panels; Having a knob to turn PSR on and off
>> would be of great convenience for manual testing and for test scripts.
>
> Is the module param not good enough for that? Iirc we recheck that every
> time ...
The only thing missing is that changing the module parameter does not
actually change the psr state. So you need to change the parameter and
then cause intel_edp_psr_update to happen.
Jani.
> -Daniel
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Jani Nikula, Intel Open Source Technology Center
next prev parent reply other threads:[~2014-03-19 15:36 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-18 19:51 [PATCH] drm/i915: Add a DRM property "psr" Siva Chandra
2014-03-18 20:06 ` Jesse Barnes
2014-03-18 20:53 ` Siva Chandra
2014-03-19 8:44 ` Daniel Vetter
2014-03-19 15:03 ` Damien Lespiau
2014-03-19 17:04 ` Siva Chandra
2014-03-20 10:52 ` Jani Nikula
2014-03-20 13:17 ` Siva Chandra
2014-03-20 13:25 ` Jani Nikula
2014-03-20 13:31 ` Siva Chandra
2014-03-20 14:49 ` Jani Nikula
2014-03-20 15:16 ` Ville Syrjälä
2014-03-21 21:10 ` Siva Chandra
2014-03-19 15:32 ` Jani Nikula [this message]
2014-03-19 16:59 ` Siva Chandra
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