Re: [V2 PATCH 2/2] drm/i915: start adding dp mst audio

[Ander Conselvan De Oliveira <conselvan2@gmail.com>]

(Cc'ing Paulo for the audio power domain question)

On Wed, 2015-11-11 at 13:33 +0800, libin.yang@linux.intel.com wrote:
> From: Libin Yang <libin.yang@linux.intel.com>
> 
> This patch adds support for DP MST audio in i915.
> 
> Enable audio codec when DP MST is enabled if has_audio flag is set.
> Disable audio codec when DP MST is disabled if has_audio flag is set.
> 
> Signed-off-by: Libin Yang <libin.yang@linux.intel.com>
> Signed-off-by: Dave Airlie <airlied@redhat.com>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 14 ++++++++++++++
>  drivers/gpu/drm/i915/intel_audio.c  |  9 ++++++---
>  drivers/gpu/drm/i915/intel_dp_mst.c | 25 +++++++++++++++++++++++++
>  3 files changed, 45 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> b/drivers/gpu/drm/i915/i915_debugfs.c
> index 5659d4c..38c7a5d 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2873,6 +2873,18 @@ static void intel_dp_info(struct seq_file *m,
>  		intel_panel_info(m, &intel_connector->panel);
>  }
>  
> +static void intel_dp_mst_info(struct seq_file *m,
> +			  struct intel_connector *intel_connector)
> +{
> +	struct intel_encoder *intel_encoder = intel_connector->encoder;
> +	struct intel_dp_mst_encoder *intel_mst =
> +		enc_to_mst(&intel_encoder->base);
> +	struct intel_digital_port *intel_dig_port = intel_mst->primary;
> +	struct intel_dp *intel_dp = &intel_dig_port->dp;
> +
> +	seq_printf(m, "\taudio support: %s\n",
> drm_dp_mst_port_has_audio(&intel_dp->mst_mgr, intel_connector->port) ? "yes" :
> "no");

Too much going on in just one line. You can replace the ternary operator with
yesno(). You could also add a has_audio bool:

bool has_audio = drm_dp_mst_port_has_audio(...);
seq_printf(..., yesno(has_audio));


> +}
> +
>  static void intel_hdmi_info(struct seq_file *m,
>  			    struct intel_connector *intel_connector)
>  {
> @@ -2916,6 +2928,8 @@ static void intel_connector_info(struct seq_file *m,
>  			intel_hdmi_info(m, intel_connector);
>  		else if (intel_encoder->type == INTEL_OUTPUT_LVDS)
>  			intel_lvds_info(m, intel_connector);
> +		else if (intel_encoder->type == INTEL_OUTPUT_DP_MST)
> +			intel_dp_mst_info(m, intel_connector);
>  	}
>  
>  	seq_printf(m, "\tmodes:\n");
> diff --git a/drivers/gpu/drm/i915/intel_audio.c
> b/drivers/gpu/drm/i915/intel_audio.c
> index 63d4706..07b2aa6 100644
> --- a/drivers/gpu/drm/i915/intel_audio.c
> +++ b/drivers/gpu/drm/i915/intel_audio.c
> @@ -262,7 +262,8 @@ static void hsw_audio_codec_disable(struct intel_encoder
> *encoder)
>  	tmp |= AUD_CONFIG_N_PROG_ENABLE;
>  	tmp &= ~AUD_CONFIG_UPPER_N_MASK;
>  	tmp &= ~AUD_CONFIG_LOWER_N_MASK;
> -	if (intel_pipe_has_type(intel_crtc, INTEL_OUTPUT_DISPLAYPORT))
> +	if (intel_pipe_has_type(intel_crtc, INTEL_OUTPUT_DISPLAYPORT) ||
> +		intel_pipe_has_type(intel_crtc, INTEL_OUTPUT_DP_MST))

The second line should be aligned with '('.

>  		tmp |= AUD_CONFIG_N_VALUE_INDEX;
>  	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
>  
> @@ -478,7 +479,8 @@ static void ilk_audio_codec_enable(struct drm_connector
> *connector,
>  	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
>  	tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
>  	tmp &= ~AUD_CONFIG_PIXEL_CLOCK_HDMI_MASK;
> -	if (intel_pipe_has_type(intel_crtc, INTEL_OUTPUT_DISPLAYPORT))
> +	if (intel_pipe_has_type(intel_crtc, INTEL_OUTPUT_DISPLAYPORT) ||
> +		intel_pipe_has_type(intel_crtc, INTEL_OUTPUT_DP_MST))

Same here.

>  		tmp |= AUD_CONFIG_N_VALUE_INDEX;
>  	else
>  		tmp |= audio_config_hdmi_pixel_clock(adjusted_mode);
> @@ -516,7 +518,8 @@ void intel_audio_codec_enable(struct intel_encoder
> *intel_encoder)
>  
>  	/* ELD Conn_Type */
>  	connector->eld[5] &= ~(3 << 2);
> -	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT))
> +	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT) ||
> +		intel_pipe_has_type(crtc, INTEL_OUTPUT_DP_MST))
>  		connector->eld[5] |= (1 << 2);

And here.

>  
>  	connector->eld[6] = drm_av_sync_delay(connector, adjusted_mode) / 2;
> diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c
> b/drivers/gpu/drm/i915/intel_dp_mst.c
> index 0639275..4ded0fb 100644
> --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> @@ -78,6 +78,8 @@ static bool intel_dp_mst_compute_config(struct intel_encoder
> *encoder,
>  		return false;
>  	}
>  
> +	if (drm_dp_mst_port_has_audio(&intel_dp->mst_mgr, found->port))
> +		pipe_config->has_audio = true;
>  	mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
>  
>  	pipe_config->pbn = mst_pbn;
> @@ -102,6 +104,11 @@ static void intel_mst_disable_dp(struct intel_encoder
> *encoder)
>  	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
>  	struct intel_digital_port *intel_dig_port = intel_mst->primary;
>  	struct intel_dp *intel_dp = &intel_dig_port->dp;
> +	struct drm_device *dev = encoder->base.dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct drm_crtc *crtc = encoder->base.crtc;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +
>  	int ret;
>  
>  	DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
> @@ -112,6 +119,10 @@ static void intel_mst_disable_dp(struct intel_encoder
> *encoder)
>  	if (ret) {
>  		DRM_ERROR("failed to update payload %d\n", ret);
>  	}
> +	if (intel_crtc->config->has_audio) {
> +		intel_audio_codec_disable(encoder);
> +		intel_display_power_put(dev_priv, POWER_DOMAIN_AUDIO);
> +	}

It seems the power domain is only need for DDI platforms. Perhaps it would make
sense to move that into hsw_audio_codec_{en,dis}able. Paulo?

>  }
>  
>  static void intel_mst_post_disable_dp(struct intel_encoder *encoder)
> @@ -214,6 +225,7 @@ static void intel_mst_enable_dp(struct intel_encoder
> *encoder)
>  	struct intel_dp *intel_dp = &intel_dig_port->dp;
>  	struct drm_device *dev = intel_dig_port->base.base.dev;
>  	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
>  	enum port port = intel_dig_port->port;
>  	int ret;
>  
> @@ -226,6 +238,13 @@ static void intel_mst_enable_dp(struct intel_encoder
> *encoder)
>  	ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
>  
>  	ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
> +
> +	if (crtc->config->has_audio) {
> +		DRM_DEBUG_DRIVER("Enabling DP audio on pipe %c\n",
> +				 pipe_name(crtc->pipe));
> +		intel_display_power_get(dev_priv, POWER_DOMAIN_AUDIO);
> +		intel_audio_codec_enable(encoder);
> +	}
>  }
>  
>  static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
> @@ -251,6 +270,12 @@ static void intel_dp_mst_enc_get_config(struct
> intel_encoder *encoder,
>  
>  	pipe_config->has_dp_encoder = true;
>  
> +	if (intel_display_power_is_enabled(dev_priv, POWER_DOMAIN_AUDIO)) {
> +		temp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
> +		if (temp & AUDIO_OUTPUT_ENABLE(crtc->pipe))
> +			pipe_config->has_audio = true;
> +	}
> +

This code is DDI specific. That shouldn't be a problem since we only support DP
MST on DDI platforms, but we shouldn't duplicate that logic here. So I think
this should be added to a function that can be called both from here and
intel_ddi.c.

Ander
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