[Intel-gfx] [PATCH v2 2/5] drm/i915: Only populate aux_ch is really needed

[Jani Nikula]

On Wed, 21 Jun 2023, Jani Nikula <jani.nikula at linux.intel.com> wrote:
> On Tue, 20 Jun 2023, Ville Syrjala <ville.syrjala at linux.intel.com> wrote:
>> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>>
>> Mixing VBT based AUX CH with platform defaults seems like
>> a recipe for conflicts. Let's only populate AUX CH if we
>> absolutely need it, that is only if we are dealing with
>> a DP output or a TC port (which need it due to some power
>> well shenanigans).
>>
>> TODO: double check that real VBTs do in fact populate
>>       the AUX CH for HDMI TC legacy ports...
>>
>> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Reviewed-by: Jani Nikula <jani.nikula at intel.com>

Typo in subject s/is/if/ ?

>
>> ---
>>  drivers/gpu/drm/i915/display/g4x_hdmi.c  |  1 -
>>  drivers/gpu/drm/i915/display/intel_ddi.c | 12 +++++++++++-
>>  2 files changed, 11 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/display/g4x_hdmi.c b/drivers/gpu/drm/i915/display/g4x_hdmi.c
>> index c1fd13bdc9d2..634b14116d9d 100644
>> --- a/drivers/gpu/drm/i915/display/g4x_hdmi.c
>> +++ b/drivers/gpu/drm/i915/display/g4x_hdmi.c
>> @@ -775,6 +775,5 @@ void g4x_hdmi_init(struct drm_i915_private *dev_priv,
>>  
>>  	intel_infoframe_init(dig_port);
>>  
>> -	dig_port->aux_ch = intel_dp_aux_ch(intel_encoder);
>>  	intel_hdmi_init_connector(dig_port, intel_connector);
>>  }
>> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
>> index 6cb24a472a9b..662b5ceef3c8 100644
>> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
>> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
>> @@ -4676,6 +4676,14 @@ static bool port_strap_detected(struct drm_i915_private *i915, enum port port)
>>  	}
>>  }
>>  
>> +static bool need_aux_ch(struct intel_encoder *encoder, bool init_dp)
>> +{
>> +	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
>> +	enum phy phy = intel_port_to_phy(i915, encoder->port);
>> +
>> +	return init_dp || intel_phy_is_tc(i915, phy);
>> +}
>> +
>>  void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
>>  {
>>  	struct intel_digital_port *dig_port;
>> @@ -4929,7 +4937,9 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
>>  
>>  	dig_port->dp.output_reg = INVALID_MMIO_REG;
>>  	dig_port->max_lanes = intel_ddi_max_lanes(dig_port);
>> -	dig_port->aux_ch = intel_dp_aux_ch(encoder);
>> +
>> +	if (need_aux_ch(encoder, init_dp))
>> +		dig_port->aux_ch = intel_dp_aux_ch(encoder);
>>  
>>  	if (intel_phy_is_tc(dev_priv, phy)) {
>>  		bool is_legacy =

-- 
Jani Nikula, Intel Open Source Graphics Center