Re: [PATCH V4 2/2] drm/i915: start adding dp mst audio

[Takashi Iwai <tiwai@suse.de>]

On Fri, 11 Dec 2015 11:43:51 +0100,
Takashi Iwai wrote:
> 
> On Fri, 11 Dec 2015 07:07:53 +0100,
> Libin Yang wrote:
> > 
> > >>> diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
> > >>> index 9aa83e7..5ad2e66 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))
> > >>>   		tmp |= AUD_CONFIG_N_VALUE_INDEX;
> 
> The same check is missing in hsw_audio_codec_enable()?
> 
> > >>>   	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> > >>>
> > >>> @@ -474,7 +475,8 @@ 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))
> > >>>   		tmp |= AUD_CONFIG_N_VALUE_INDEX;
> 
> ... and missing for ilk_audio_codec_disable()?
> 
> 
> > >>>   	else
> > >>>   		tmp |= audio_config_hdmi_pixel_clock(adjusted_mode);
> > >>> @@ -512,7 +514,8 @@ 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))
> 
> IMO, it's better to have a macro to cover this two-line check instead
> of open-coding at each place.  We'll have 5 places in the end.

Also, this patch still has an issue about the encoder type, namely, it
passes intel_encoder from MST, where you can't apply
enc_to_dig_port().  We need another help to get the digital port
depending on the encoder type, e.g.

static struct intel_digital_port *
intel_encoder_to_dig_port(struct intel_encoder *intel_encoder)
{
	struct drm_encoder *encoder = &intel_encoder->base;

	if (intel_encoder->type == INTEL_OUTPUT_DP_MST)
		return enc_to_mst(encoder)->primary;
	return enc_to_dig_port(encoder);
}


Takashi
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