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

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

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.

BR,
Jani.



>
>
> thanks,
>
> Takashi

-- 
Jani Nikula, Intel Open Source Technology Center
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