Re: [PATCH v7 5/5] drm/i915: start adding dp mst audio

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

On Tue, 20 Sep 2016, Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> wrote:
> From: Libin Yang <libin.yang@linux.intel.com>
>
> (This patch is developed by Dave Airlie <airlied@redhat.com> originally)
>
> 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.
>
> Another separated patches to support DP MST audio will be implemented
> in audio driver.
>
> v2:
> Rebased.
>
> Signed-off-by: Libin Yang <libin.yang@linux.intel.com>
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> Reviewed-by: Lyude <cpaul@redhat.com>

This patch causes a regression on a DP MST multi-monitor setup:
https://bugs.freedesktop.org/show_bug.cgi?id=97907

BR,
Jani.


> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 19 ++++++++++++++++++-
>  drivers/gpu/drm/i915/intel_ddi.c    | 20 +++++++++++++++-----
>  drivers/gpu/drm/i915/intel_dp_mst.c | 18 ++++++++++++++++++
>  drivers/gpu/drm/i915/intel_drv.h    |  2 ++
>  4 files changed, 53 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 27b0e34..1384da5 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2865,6 +2865,20 @@ static void intel_dp_info(struct seq_file *m,
>  				&intel_dp->aux);
>  }
>  
> +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;
> +	bool has_audio = drm_dp_mst_port_has_audio(&intel_dp->mst_mgr,
> +					intel_connector->port);
> +
> +	seq_printf(m, "\taudio support: %s\n", yesno(has_audio));
> +}
> +
>  static void intel_hdmi_info(struct seq_file *m,
>  			    struct intel_connector *intel_connector)
>  {
> @@ -2907,7 +2921,10 @@ static void intel_connector_info(struct seq_file *m,
>  	switch (connector->connector_type) {
>  	case DRM_MODE_CONNECTOR_DisplayPort:
>  	case DRM_MODE_CONNECTOR_eDP:
> -		intel_dp_info(m, intel_connector);
> +		if (intel_encoder->type == INTEL_OUTPUT_DP_MST)
> +			intel_dp_mst_info(m, intel_connector);
> +		else
> +			intel_dp_info(m, intel_connector);
>  		break;
>  	case DRM_MODE_CONNECTOR_LVDS:
>  		if (intel_encoder->type == INTEL_OUTPUT_LVDS)
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index daf3adb..24275e9 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -2230,6 +2230,19 @@ void intel_ddi_prepare_link_retrain(struct intel_dp *intel_dp)
>  	udelay(600);
>  }
>  
> +bool intel_ddi_is_audio_enabled(struct drm_i915_private *dev_priv,
> +				 struct intel_crtc *intel_crtc)
> +{
> +	u32 temp;
> +
> +	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(intel_crtc->pipe))
> +			return true;
> +	}
> +	return false;
> +}
> +
>  void intel_ddi_get_config(struct intel_encoder *encoder,
>  			  struct intel_crtc_state *pipe_config)
>  {
> @@ -2295,11 +2308,8 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
>  		break;
>  	}
>  
> -	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(intel_crtc->pipe))
> -			pipe_config->has_audio = true;
> -	}
> +	pipe_config->has_audio =
> +		intel_ddi_is_audio_enabled(dev_priv, intel_crtc);
>  
>  	if (encoder->type == INTEL_OUTPUT_EDP && dev_priv->vbt.edp.bpp &&
>  	    pipe_config->pipe_bpp > dev_priv->vbt.edp.bpp) {
> diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> index 3ffbd69..2fc9f81 100644
> --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> @@ -37,6 +37,8 @@ static bool intel_dp_mst_compute_config(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 intel_connector *connector =
> +		to_intel_connector(conn_state->connector);
>  	struct drm_atomic_state *state;
>  	int bpp;
>  	int lane_count, slots;
> @@ -59,6 +61,8 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
>  
>  	state = pipe_config->base.state;
>  
> +	if (drm_dp_mst_port_has_audio(&intel_dp->mst_mgr, connector->port))
> +		pipe_config->has_audio = true;
>  	mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
>  
>  	pipe_config->pbn = mst_pbn;
> @@ -84,6 +88,7 @@ static void intel_mst_disable_dp(struct intel_encoder *encoder,
>  	struct intel_dp *intel_dp = &intel_dig_port->dp;
>  	struct intel_connector *connector =
>  		to_intel_connector(old_conn_state->connector);
> +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>  	int ret;
>  
>  	DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
> @@ -94,6 +99,10 @@ static void intel_mst_disable_dp(struct intel_encoder *encoder,
>  	if (ret) {
>  		DRM_ERROR("failed to update payload %d\n", ret);
>  	}
> +	if (old_crtc_state->has_audio) {
> +		intel_audio_codec_disable(encoder);
> +		intel_display_power_put(dev_priv, POWER_DOMAIN_AUDIO);
> +	}
>  }
>  
>  static void intel_mst_post_disable_dp(struct intel_encoder *encoder,
> @@ -206,6 +215,12 @@ 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 (pipe_config->has_audio) {
> +		DRM_DEBUG_DRIVER("Enabling DP audio on pipe %c\n",
> +				 pipe_name(intel_mst->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,
> @@ -228,6 +243,9 @@ static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
>  	enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
>  	u32 temp, flags = 0;
>  
> +	pipe_config->has_audio =
> +		intel_ddi_is_audio_enabled(dev_priv, crtc);
> +
>  	temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
>  	if (temp & TRANS_DDI_PHSYNC)
>  		flags |= DRM_MODE_FLAG_PHSYNC;
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index cf92bc0..8bb5358 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1155,6 +1155,8 @@ bool intel_ddi_pll_select(struct intel_crtc *crtc,
>  void intel_ddi_set_pipe_settings(struct drm_crtc *crtc);
>  void intel_ddi_prepare_link_retrain(struct intel_dp *intel_dp);
>  bool intel_ddi_connector_get_hw_state(struct intel_connector *intel_connector);
> +bool intel_ddi_is_audio_enabled(struct drm_i915_private *dev_priv,
> +				 struct intel_crtc *intel_crtc);
>  void intel_ddi_get_config(struct intel_encoder *encoder,
>  			  struct intel_crtc_state *pipe_config);
>  struct intel_encoder *

-- 
Jani Nikula, Intel Open Source Technology Center
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