Re: [PATCH v2 07/18] drm/i915/ddi: write ELD where it's supposed to be done

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

On Mon, 27 Oct 2014, Rodrigo Vivi <rodrigo.vivi@gmail.com> wrote:
> On Mon, Oct 27, 2014 at 7:26 AM, Jani Nikula <jani.nikula@intel.com> wrote:
>> The audio programming sequence states that the ELD must be written and
>> enabled after the pipe is ready. Indeed, this should clarify the
>> situation with
>
> Where/what doc can I confirm this?

Bspec -> Display -> North Display Engine Registers -> North Display
Engine Audio -> Audio Programming Sequence etc.

Jani.


>
>>
>> commit c79057922ed6c2c6df1214e6ab4414fea1b23db2
>> Author: Daniel Vetter <daniel.vetter@ffwll.ch>
>> Date:   Wed Apr 16 16:56:09 2014 +0200
>>
>>     drm/i915: Remove vblank wait from haswell_write_eld
>>
>> and Ville's review of it [1].
>>
>> Moreover, we should not touch the relevant registers before we get the
>> audio power domain.
>>
>> [1] http://mid.gmane.org/20140416155309.GK18465@intel.com
>>
>> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
>> ---
>>  drivers/gpu/drm/i915/intel_audio.c |  2 --
>>  drivers/gpu/drm/i915/intel_ddi.c   | 11 ++---------
>>  2 files changed, 2 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
>> index 4d644efde608..b9d3a143dd8c 100644
>> --- a/drivers/gpu/drm/i915/intel_audio.c
>> +++ b/drivers/gpu/drm/i915/intel_audio.c
>> @@ -160,8 +160,6 @@ static void haswell_write_eld(struct drm_connector *connector,
>>         I915_WRITE(aud_cntrl_st2, tmp);
>>         POSTING_READ(aud_cntrl_st2);
>>
>> -       assert_pipe_disabled(dev_priv, pipe);
>> -
>>         /* Set ELD valid state */
>>         tmp = I915_READ(aud_cntrl_st2);
>>         DRM_DEBUG_DRIVER("HDMI audio: pin eld vld status=0x%08x\n", tmp);
>> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
>> index 2688bc940879..56e7cb1ddc75 100644
>> --- a/drivers/gpu/drm/i915/intel_ddi.c
>> +++ b/drivers/gpu/drm/i915/intel_ddi.c
>> @@ -1120,15 +1120,6 @@ static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder)
>>         enum port port = intel_ddi_get_encoder_port(intel_encoder);
>>         int type = intel_encoder->type;
>>
>> -       if (crtc->config.has_audio) {
>> -               DRM_DEBUG_DRIVER("Audio on pipe %c on DDI\n",
>> -                                pipe_name(crtc->pipe));
>> -
>> -               /* write eld */
>> -               DRM_DEBUG_DRIVER("DDI audio: write eld information\n");
>> -               intel_write_eld(intel_encoder);
>> -       }
>> -
>>         if (type == INTEL_OUTPUT_EDP) {
>>                 struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
>>                 intel_edp_panel_on(intel_dp);
>> @@ -1225,6 +1216,8 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder)
>>
>>         if (intel_crtc->config.has_audio) {
>>                 intel_display_power_get(dev_priv, POWER_DOMAIN_AUDIO);
>> +               intel_write_eld(intel_encoder);
>> +
>>                 tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
>>                 tmp |= ((AUDIO_OUTPUT_ENABLE_A | AUDIO_ELD_VALID_A) << (pipe * 4));
>>                 I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);
>> --
>> 2.1.1
>>
>> _______________________________________________
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>
>
>
> -- 
> Rodrigo Vivi
> Blog: http://blog.vivi.eng.br

-- 
Jani Nikula, Intel Open Source Technology Center
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