Re: [PATCH v3] drm/i915: Do not enable DRRS when PSR is enabled

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On Mon, Sep 18, 2017 at 12:35 PM, Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> wrote:
> On Thu, Sep 14, 2017 at 06:16:41PM +0000, Radhakrishna Sripada wrote:
>> Some platforms do not support PSR and DRRS simultaneously.
>> Visual artifacts and flickering were reported on BDW HP Spectre
>> x360 Convertible. Deferring to PSR when both PSR and DRRS are
>> supported by the panel.
>>
>> V2: Minor code-style changes suggested by Rodrigo
>> V3: Add a WARN_ON during PSR init suggested by Dhinakaran
>>     Correct debug message,title suggested by Jani
>>
>> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101111
>> Cc: Nicholas Stommel <nicholas.stommel@xxxxxxxxx>
>> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
>> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
>> Cc: Clinton Taylor <clinton.a.taylor@xxxxxxxxx>
>> Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
>> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
>
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>

merged to dinq. thanks for the patch.

>
>> ---
>>  drivers/gpu/drm/i915/intel_dp.c  | 10 +++++-----
>>  drivers/gpu/drm/i915/intel_psr.c |  1 +
>>  2 files changed, 6 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
>> index 887953c0f495..8db6b11f103f 100644
>> --- a/drivers/gpu/drm/i915/intel_dp.c
>> +++ b/drivers/gpu/drm/i915/intel_dp.c
>> @@ -5467,11 +5467,6 @@ static void intel_dp_set_drrs_state(struct drm_i915_private *dev_priv,
>>               return;
>>       }
>>
>> -     /*
>> -      * FIXME: This needs proper synchronization with psr state for some
>> -      * platforms that cannot have PSR and DRRS enabled at the same time.
>> -      */
>> -
>>       dig_port = dp_to_dig_port(intel_dp);
>>       encoder = &dig_port->base;
>>       intel_crtc = to_intel_crtc(encoder->base.crtc);
>> @@ -5555,6 +5550,11 @@ void intel_edp_drrs_enable(struct intel_dp *intel_dp,
>>               return;
>>       }
>>
>> +     if (dev_priv->psr.enabled) {
>> +             DRM_DEBUG_KMS("PSR enabled. Not enabling DRRS.\n");
>> +             return;
>> +     }
>> +
>>       mutex_lock(&dev_priv->drrs.mutex);
>>       if (WARN_ON(dev_priv->drrs.dp)) {
>>               DRM_ERROR("DRRS already enabled\n");
>> diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
>> index 55b4002bbe53..acb50945bfa8 100644
>> --- a/drivers/gpu/drm/i915/intel_psr.c
>> +++ b/drivers/gpu/drm/i915/intel_psr.c
>> @@ -530,6 +530,7 @@ void intel_psr_enable(struct intel_dp *intel_dp,
>>               return;
>>       }
>>
>> +     WARN_ON(dev_priv->drrs.dp);
>>       mutex_lock(&dev_priv->psr.lock);
>>       if (dev_priv->psr.enabled) {
>>               DRM_DEBUG_KMS("PSR already in use\n");
>> --
>> 2.9.3
>>
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-- 
Rodrigo Vivi
Blog: http://blog.vivi.eng.br
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