Re: [Intel-gfx] [PATCH 06/11] drm/i915: Split g4x+ DP audio presence detect from port enable

[Jani Nikula <jani.nikula@linux.intel.com>]

On Mon, 06 Nov 2023, Ville Syrjala <ville.syrjala@linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> Follow the hsw+ approach toggle the audio presence detect
> when we set up the ELD, instead of doing it when turning the
> port on/off.
>
> This will facilitate audio enable/disable to happen during
> fastsets instead of requiring a full modeset.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Reviewed-by: Jani Nikula <jani.nikula@intel.com>

> ---
>  drivers/gpu/drm/i915/display/g4x_dp.c | 18 +++++++++++++++---
>  1 file changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/g4x_dp.c b/drivers/gpu/drm/i915/display/g4x_dp.c
> index ecc2ec866424..266cb594d793 100644
> --- a/drivers/gpu/drm/i915/display/g4x_dp.c
> +++ b/drivers/gpu/drm/i915/display/g4x_dp.c
> @@ -432,7 +432,7 @@ intel_dp_link_down(struct intel_encoder *encoder,
>  	intel_de_write(dev_priv, intel_dp->output_reg, intel_dp->DP);
>  	intel_de_posting_read(dev_priv, intel_dp->output_reg);
>  
> -	intel_dp->DP &= ~(DP_PORT_EN | DP_AUDIO_OUTPUT_ENABLE);
> +	intel_dp->DP &= ~DP_PORT_EN;
>  	intel_de_write(dev_priv, intel_dp->output_reg, intel_dp->DP);
>  	intel_de_posting_read(dev_priv, intel_dp->output_reg);
>  
> @@ -479,9 +479,16 @@ static void g4x_dp_audio_enable(struct intel_encoder *encoder,
>  				const struct intel_crtc_state *crtc_state,
>  				const struct drm_connector_state *conn_state)
>  {
> +	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> +
>  	if (!crtc_state->has_audio)
>  		return;
>  
> +	/* Enable audio presence detect */
> +	intel_dp->DP |= DP_AUDIO_OUTPUT_ENABLE;
> +	intel_de_write(i915, intel_dp->output_reg, intel_dp->DP);
> +
>  	intel_audio_codec_enable(encoder, crtc_state, conn_state);
>  }
>  
> @@ -489,10 +496,17 @@ static void g4x_dp_audio_disable(struct intel_encoder *encoder,
>  				 const struct intel_crtc_state *old_crtc_state,
>  				 const struct drm_connector_state *old_conn_state)
>  {
> +	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> +
>  	if (!old_crtc_state->has_audio)
>  		return;
>  
>  	intel_audio_codec_disable(encoder, old_crtc_state, old_conn_state);
> +
> +	/* Disable audio presence detect */
> +	intel_dp->DP &= ~DP_AUDIO_OUTPUT_ENABLE;
> +	intel_de_write(i915, intel_dp->output_reg, intel_dp->DP);
>  }
>  
>  static void intel_disable_dp(struct intel_atomic_state *state,
> @@ -651,8 +665,6 @@ static void intel_dp_enable_port(struct intel_dp *intel_dp,
>  	 * fail when the power sequencer is freshly used for this port.
>  	 */
>  	intel_dp->DP |= DP_PORT_EN;
> -	if (crtc_state->has_audio)
> -		intel_dp->DP |= DP_AUDIO_OUTPUT_ENABLE;
>  
>  	intel_de_write(dev_priv, intel_dp->output_reg, intel_dp->DP);
>  	intel_de_posting_read(dev_priv, intel_dp->output_reg);

-- 
Jani Nikula, Intel