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

From: Takashi Iwai <tiwai@suse.de>
To: Jani Nikula <jani.nikula@linux.intel.com>
Cc: alsa-devel@alsa-project.org, intel-gfx@lists.freedesktop.org,
	Dave Airlie <airlied@redhat.com>,
	daniel.vetter@intel.com, Libin Yang <libin.yang@linux.intel.com>
Subject: Re: [PATCH V4 2/2] drm/i915: start adding dp mst audio
Date: Mon, 14 Dec 2015 11:41:54 +0100	[thread overview]
Message-ID: <s5hy4cxia6l.wl-tiwai@suse.de> (raw)
In-Reply-To: <87egepuxma.fsf@intel.com>

On Mon, 14 Dec 2015 11:34:53 +0100,
Jani Nikula wrote:
> 
> On Mon, 14 Dec 2015, Takashi Iwai <tiwai@suse.de> wrote:
> > On Mon, 14 Dec 2015 10:33:44 +0100,
> > Jani Nikula wrote:
> >> 
> >> On Fri, 11 Dec 2015, Takashi Iwai <tiwai@suse.de> 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.
> >> 
> >> I don't think that's necessary. Only the hsw_* functions need it, the
> >> other platforms (using the other functions) don't support DP MST.
> >
> > Then the patch changes the functions.  And still three places have
> > this check.
> 
> Probably the mistake in the patch was to add the check to
> ilk_audio_codec_enable when it should have been added to
> hsw_audio_codec_enable.

Yeah, I wanted to write "the patch changes the wrong functions", too.

Takashi
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