Re: [PATCH 2/4] i915: add support for GPU side of MST audio

[Daniel Vetter <daniel@ffwll.ch>]

On Wed, Jun 17, 2015 at 02:01:57PM +1000, Dave Airlie wrote:
> From: Dave Airlie <airlied@redhat.com>
> 
> This just adds enables for the codecs and debugfs
> support for mst connectors to print the audio info.
> 
> This relies on patches to the audio code to do anything
> more useful.
> 
> Signed-off-by: Dave Airlie <airlied@redhat.com>

Might be time to refactor all the ddi code a bit since this duplicates a
lot. Otoh the code in intel_ddi.c is full of presonality confusion
if-ladders which ain't pretty either.

Anyway this duplicates what we do for sst audio, and I guess that makes
sense. Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> since I lack clue
for a real r-b.

Feel free to merge through whatever tree you want if the audio folks keep
on being offline. But perhaps first resend again with alsa-devel on cc.
-Daniel

> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 13 +++++++++++++
>  drivers/gpu/drm/i915/intel_audio.c  |  7 ++++---
>  drivers/gpu/drm/i915/intel_dp_mst.c | 25 +++++++++++++++++++++++++
>  3 files changed, 42 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index dc55c51..a109a21 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2577,6 +2577,17 @@ 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");
> +}
> +
>  static void intel_hdmi_info(struct seq_file *m,
>  			    struct intel_connector *intel_connector)
>  {
> @@ -2621,6 +2632,8 @@ 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 2396cc7..77d2a01 100644
> --- a/drivers/gpu/drm/i915/intel_audio.c
> +++ b/drivers/gpu/drm/i915/intel_audio.c
> @@ -190,7 +190,7 @@ 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))
>  		tmp |= AUD_CONFIG_N_VALUE_INDEX;
>  	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
>  
> @@ -231,6 +231,7 @@ static void hsw_audio_codec_enable(struct drm_connector *connector,
>  	/* Reset ELD write address */
>  	tmp = I915_READ(HSW_AUD_DIP_ELD_CTRL(pipe));
>  	tmp &= ~IBX_ELD_ADDRESS_MASK;
> +	tmp |= ((pipe + 1) << 29);
>  	I915_WRITE(HSW_AUD_DIP_ELD_CTRL(pipe), tmp);
>  
>  	/* Up to 84 bytes of hw ELD buffer */
> @@ -248,7 +249,7 @@ static void hsw_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))
>  		tmp |= AUD_CONFIG_N_VALUE_INDEX;
>  	else
>  		tmp |= audio_config_hdmi_pixel_clock(mode);
> @@ -417,7 +418,7 @@ 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);
>  
>  	connector->eld[6] = drm_av_sync_delay(connector, mode) / 2;
> diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> index 5cb4748..8a39e99 100644
> --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> @@ -85,6 +85,8 @@ 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->clock, bpp);
>  
>  	pipe_config->pbn = mst_pbn;
> @@ -105,6 +107,11 @@ 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);
> @@ -115,6 +122,10 @@ 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);
> +	}
>  }
>  
>  static void intel_mst_post_disable_dp(struct intel_encoder *encoder)
> @@ -209,6 +220,7 @@ 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;
>  
> @@ -221,6 +233,13 @@ 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,
> @@ -246,6 +265,12 @@ 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;
> +        }
> +
>  	temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
>  	if (temp & TRANS_DDI_PHSYNC)
>  		flags |= DRM_MODE_FLAG_PHSYNC;
> -- 
> 2.4.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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