[Intel-gfx] [PATCH] drm/i915: Fix bogus dig_port_map[] assignment for pre-HSW

[Martin Kepplinger]

Am 2016-03-03 um 16:05 schrieb Takashi Iwai:
> On Mon, 29 Feb 2016 15:39:53 +0100,
> Jani Nikula wrote:
>>
>> On Mon, 29 Feb 2016, Martin Kepplinger <martink at posteo.de> wrote:
>>> Am 2016-02-26 um 20:59 schrieb Takashi Iwai:
>>>> Sorry, Cc to Jani was missing mistakenly.
>>>>
>>>> Please check this.  It's a regression in 4.5-rc.
>>>>
>>>>
>>>> thanks,
>>>>
>>>> Takashi
>>>>
>>>
>>> I can confirm that with -rc6 nothing changed and this fixes audio over
>>> HDMI for me. I added David Airlie and dri-devel to CC aswell and hope
>>> that this can go in for 4.5 in the last minute.
>>
>> I'll pick this up when we get the CI results. (This had fallen between
>> the cracks...)
> 
> As far as looking at linux-next, this one still seems remaining in the
> crevasse...
> 

This still isn't merged but still fixes a serious regression in v4.5.
What's going on?

thanks
                            martin

> 
> thanks,
> 
> Takashi
> 
>>
>> BR,
>> Jani.
>>
>>
>>
>>>
>>> thanks
>>>                             martin
>>>
>>>
>>>> On Wed, 24 Feb 2016 15:35:22 +0100,
>>>> Takashi Iwai wrote:
>>>>>
>>>>> The recent commit [0bdf5a05647a: drm/i915: Add reverse mapping between
>>>>> port and intel_encoder] introduced a reverse mapping to retrieve
>>>>> intel_dig_port object from the port number.  The code assumed that the
>>>>> port vs intel_dig_port are 1:1 mapping.  But in reality, this was a
>>>>> too naive assumption.
>>>>>
>>>>> As Martin reported about the missing HDMI audio on his SNB machine,
>>>>> pre-HSW chips may have multiple intel_dig_port objects corresponding
>>>>> to the same port.  Since we assign the mapping statically at the init
>>>>> time and the multiple objects override the map, it may not match with
>>>>> the actually enabled output.
>>>>>
>>>>> This patch tries to address the regression above.  The reverse mapping
>>>>> is provided basically only for the audio callbacks, so now we set /
>>>>> clear the mapping dynamically at enabling and disabling HDMI/DP audio,
>>>>> so that we can always track the latest and correct object
>>>>> corresponding to the given port.
>>>>>
>>>>> Fixes: 0bdf5a05647a ('drm/i915: Add reverse mapping between port and intel_encoder')
>>>>> Reported-and-tested-by: Martin Kepplinger <martink at posteo.de>
>>>>> Signed-off-by: Takashi Iwai <tiwai at suse.de>
>>>>> ---
>>>>>  drivers/gpu/drm/i915/intel_audio.c | 3 +++
>>>>>  drivers/gpu/drm/i915/intel_ddi.c   | 1 -
>>>>>  drivers/gpu/drm/i915/intel_dp.c    | 1 -
>>>>>  drivers/gpu/drm/i915/intel_hdmi.c  | 2 --
>>>>>  4 files changed, 3 insertions(+), 4 deletions(-)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
>>>>> index 31f6d212fb1b..30f921421b0c 100644
>>>>> --- a/drivers/gpu/drm/i915/intel_audio.c
>>>>> +++ b/drivers/gpu/drm/i915/intel_audio.c
>>>>> @@ -527,6 +527,8 @@ void intel_audio_codec_enable(struct intel_encoder *intel_encoder)
>>>>>  
>>>>>  	mutex_lock(&dev_priv->av_mutex);
>>>>>  	intel_dig_port->audio_connector = connector;
>>>>> +	/* referred in audio callbacks */
>>>>> +	dev_priv->dig_port_map[port] = intel_encoder;
>>>>>  	mutex_unlock(&dev_priv->av_mutex);
>>>>>  
>>>>>  	if (acomp && acomp->audio_ops && acomp->audio_ops->pin_eld_notify)
>>>>> @@ -554,6 +556,7 @@ void intel_audio_codec_disable(struct intel_encoder *intel_encoder)
>>>>>  
>>>>>  	mutex_lock(&dev_priv->av_mutex);
>>>>>  	intel_dig_port->audio_connector = NULL;
>>>>> +	dev_priv->dig_port_map[port] = NULL;
>>>>>  	mutex_unlock(&dev_priv->av_mutex);
>>>>>  
>>>>>  	if (acomp && acomp->audio_ops && acomp->audio_ops->pin_eld_notify)
>>>>> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
>>>>> index 54a165b9c92d..a50fc452d5f1 100644
>>>>> --- a/drivers/gpu/drm/i915/intel_ddi.c
>>>>> +++ b/drivers/gpu/drm/i915/intel_ddi.c
>>>>> @@ -3312,7 +3312,6 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
>>>>>  	intel_encoder->get_config = intel_ddi_get_config;
>>>>>  
>>>>>  	intel_dig_port->port = port;
>>>>> -	dev_priv->dig_port_map[port] = intel_encoder;
>>>>>  	intel_dig_port->saved_port_bits = I915_READ(DDI_BUF_CTL(port)) &
>>>>>  					  (DDI_BUF_PORT_REVERSAL |
>>>>>  					   DDI_A_4_LANES);
>>>>> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
>>>>> index 1bbd67b046da..acf918728492 100644
>>>>> --- a/drivers/gpu/drm/i915/intel_dp.c
>>>>> +++ b/drivers/gpu/drm/i915/intel_dp.c
>>>>> @@ -6035,7 +6035,6 @@ intel_dp_init(struct drm_device *dev,
>>>>>  	}
>>>>>  
>>>>>  	intel_dig_port->port = port;
>>>>> -	dev_priv->dig_port_map[port] = intel_encoder;
>>>>>  	intel_dig_port->dp.output_reg = output_reg;
>>>>>  
>>>>>  	intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
>>>>> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
>>>>> index 4a77639a489d..23ee48dc765f 100644
>>>>> --- a/drivers/gpu/drm/i915/intel_hdmi.c
>>>>> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
>>>>> @@ -2146,7 +2146,6 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
>>>>>  void intel_hdmi_init(struct drm_device *dev,
>>>>>  		     i915_reg_t hdmi_reg, enum port port)
>>>>>  {
>>>>> -	struct drm_i915_private *dev_priv = dev->dev_private;
>>>>>  	struct intel_digital_port *intel_dig_port;
>>>>>  	struct intel_encoder *intel_encoder;
>>>>>  	struct intel_connector *intel_connector;
>>>>> @@ -2215,7 +2214,6 @@ void intel_hdmi_init(struct drm_device *dev,
>>>>>  		intel_encoder->cloneable |= 1 << INTEL_OUTPUT_HDMI;
>>>>>  
>>>>>  	intel_dig_port->port = port;
>>>>> -	dev_priv->dig_port_map[port] = intel_encoder;
>>>>>  	intel_dig_port->hdmi.hdmi_reg = hdmi_reg;
>>>>>  	intel_dig_port->dp.output_reg = INVALID_MMIO_REG;
>>>>>  
>>>>> -- 
>>>>> 2.7.2
>>>>>
>>>>> _______________________________________________
>>>>> Intel-gfx mailing list
>>>>> Intel-gfx at lists.freedesktop.org
>>>>> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>>>
>>
>> -- 
>> Jani Nikula, Intel Open Source Technology Center
>>