Re: [Intel-gfx] [PATCH v2 1/8] drm/i915/display: Move out code to return the digital_port of the aux ch

[Imre Deak <imre.deak@intel.com>]

On Mon, Apr 06, 2020 at 06:11:50PM -0700, José Roberto de Souza wrote:
> Moving the code to return the digital port of the aux channel also
> removing the intel_phy_is_tc() to make it generic.
> digital_port will be needed in icl_tc_phy_aux_power_well_enable()
> so adding it as a parameter to icl_tc_port_assert_ref_held().
> 
> While at at removing the duplicated call to icl_tc_phy_aux_ch() in
> icl_tc_port_assert_ref_held().
> 
> v2:
> - fixed build when DRM_I915_DEBUG_RUNTIME_PM is not set
> - moved to before hsw_wait_for_power_well_enable() as it will be
> needed by hsw_wait_for_power_well_enable() in a future patch
> 
> Cc: You-Sheng Yang <vicamo@gmail.com>
> Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
> ---
>  .../drm/i915/display/intel_display_power.c    | 69 ++++++++++---------
>  1 file changed, 37 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
> index 433e5a81dd4d..f2f42b5960df 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_power.c
> @@ -282,6 +282,33 @@ static void hsw_power_well_pre_disable(struct drm_i915_private *dev_priv,
>  		gen8_irq_power_well_pre_disable(dev_priv, irq_pipe_mask);
>  }
>  
> +static struct intel_digital_port *
> +aux_ch_to_digital_port(struct drm_i915_private *dev_priv,
> +		       enum aux_ch aux_ch)
> +{
> +	struct intel_digital_port *dig_port = NULL;
> +	struct intel_encoder *encoder;
> +
> +	for_each_intel_encoder(&dev_priv->drm, encoder) {
> +		/* We'll check the MST primary port */
> +		if (encoder->type == INTEL_OUTPUT_DP_MST)
> +			continue;
> +
> +		dig_port = enc_to_dig_port(encoder);
> +		if (drm_WARN_ON(&dev_priv->drm, !dig_port))

This would not work on non-digital port encoders (DSI), so just
		if (!dig_port)

With that fixed:
Reviewed-by: Imre Deak <imre.deak@intel.com>

> +			continue;
> +
> +		if (dig_port->aux_ch != aux_ch) {
> +			dig_port = NULL;
> +			continue;
> +		}
> +
> +		break;
> +	}
> +
> +	return dig_port;
> +}
> +
>  static void hsw_wait_for_power_well_enable(struct drm_i915_private *dev_priv,
>  					   struct i915_power_well *power_well)
>  {
> @@ -501,41 +528,14 @@ static int power_well_async_ref_count(struct drm_i915_private *dev_priv,
>  }
>  
>  static void icl_tc_port_assert_ref_held(struct drm_i915_private *dev_priv,
> -					struct i915_power_well *power_well)
> +					struct i915_power_well *power_well,
> +					struct intel_digital_port *dig_port)
>  {
> -	enum aux_ch aux_ch = icl_tc_phy_aux_ch(dev_priv, power_well);
> -	struct intel_digital_port *dig_port = NULL;
> -	struct intel_encoder *encoder;
> -
>  	/* Bypass the check if all references are released asynchronously */
>  	if (power_well_async_ref_count(dev_priv, power_well) ==
>  	    power_well->count)
>  		return;
>  
> -	aux_ch = icl_tc_phy_aux_ch(dev_priv, power_well);
> -
> -	for_each_intel_encoder(&dev_priv->drm, encoder) {
> -		enum phy phy = intel_port_to_phy(dev_priv, encoder->port);
> -
> -		if (!intel_phy_is_tc(dev_priv, phy))
> -			continue;
> -
> -		/* We'll check the MST primary port */
> -		if (encoder->type == INTEL_OUTPUT_DP_MST)
> -			continue;
> -
> -		dig_port = enc_to_dig_port(encoder);
> -		if (drm_WARN_ON(&dev_priv->drm, !dig_port))
> -			continue;
> -
> -		if (dig_port->aux_ch != aux_ch) {
> -			dig_port = NULL;
> -			continue;
> -		}
> -
> -		break;
> -	}
> -
>  	if (drm_WARN_ON(&dev_priv->drm, !dig_port))
>  		return;
>  
> @@ -545,7 +545,8 @@ static void icl_tc_port_assert_ref_held(struct drm_i915_private *dev_priv,
>  #else
>  
>  static void icl_tc_port_assert_ref_held(struct drm_i915_private *dev_priv,
> -					struct i915_power_well *power_well)
> +					struct i915_power_well *power_well,
> +					struct intel_digital_port *dig_port)
>  {
>  }
>  
> @@ -558,9 +559,10 @@ icl_tc_phy_aux_power_well_enable(struct drm_i915_private *dev_priv,
>  				 struct i915_power_well *power_well)
>  {
>  	enum aux_ch aux_ch = icl_tc_phy_aux_ch(dev_priv, power_well);
> +	struct intel_digital_port *dig_port = aux_ch_to_digital_port(dev_priv, aux_ch);
>  	u32 val;
>  
> -	icl_tc_port_assert_ref_held(dev_priv, power_well);
> +	icl_tc_port_assert_ref_held(dev_priv, power_well, dig_port);
>  
>  	val = intel_de_read(dev_priv, DP_AUX_CH_CTL(aux_ch));
>  	val &= ~DP_AUX_CH_CTL_TBT_IO;
> @@ -588,7 +590,10 @@ static void
>  icl_tc_phy_aux_power_well_disable(struct drm_i915_private *dev_priv,
>  				  struct i915_power_well *power_well)
>  {
> -	icl_tc_port_assert_ref_held(dev_priv, power_well);
> +	enum aux_ch aux_ch = icl_tc_phy_aux_ch(dev_priv, power_well);
> +	struct intel_digital_port *dig_port = aux_ch_to_digital_port(dev_priv, aux_ch);
> +
> +	icl_tc_port_assert_ref_held(dev_priv, power_well, dig_port);
>  
>  	hsw_power_well_disable(dev_priv, power_well);
>  }
> -- 
> 2.26.0
> 
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