linux-kernel - Re: [RFC PATCH 3/5] drm/i915: hdmi: add CEC notifier to intel

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Message-ID: <85da38a7-f396-882a-723e-437cc53d9c63@baylibre.com>
Date:   Tue, 15 May 2018 09:30:32 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Hans Verkuil <hverkuil@...all.nl>, airlied@...ux.ie,
        hans.verkuil@...co.com, lee.jones@...aro.org, olof@...om.net,
        seanpaul@...gle.com
Cc:     sadolfsson@...gle.com, felixe@...gle.com, bleung@...gle.com,
        darekm@...gle.com, marcheu@...omium.org, fparent@...libre.com,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/5] drm/i915: hdmi: add CEC notifier to intel_hdmi

On 15/05/2018 08:29, Hans Verkuil wrote:
> On 05/15/2018 12:40 AM, Neil Armstrong wrote:
>> This patchs adds the cec_notifier feature to the intel_hdmi part
>> of the i915 DRM driver. It uses the HDMI DRM connector name to differentiate
>> between each HDMI ports.
>> The changes will allow the i915 HDMI code to notify EDID and HPD changes
>> to an eventual CEC adapter.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>>  drivers/gpu/drm/i915/intel_drv.h  |  2 ++
>>  drivers/gpu/drm/i915/intel_hdmi.c | 10 ++++++++++
>>  2 files changed, 12 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
>> index d436858..b50e51b 100644
>> --- a/drivers/gpu/drm/i915/intel_drv.h
>> +++ b/drivers/gpu/drm/i915/intel_drv.h
>> @@ -39,6 +39,7 @@
>>  #include <drm/drm_dp_mst_helper.h>
>>  #include <drm/drm_rect.h>
>>  #include <drm/drm_atomic.h>
>> +#include <media/cec-notifier.h>
>>  
>>  /**
>>   * __wait_for - magic wait macro
>> @@ -1001,6 +1002,7 @@ struct intel_hdmi {
>>  	bool has_audio;
>>  	bool rgb_quant_range_selectable;
>>  	struct intel_connector *attached_connector;
>> +	struct cec_notifier *notifier;
>>  };
>>  
>>  struct intel_dp_mst_encoder;
>> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
>> index 1baef4a..9b94d72 100644
>> --- a/drivers/gpu/drm/i915/intel_hdmi.c
>> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
>> @@ -1868,6 +1868,8 @@ intel_hdmi_set_edid(struct drm_connector *connector)
>>  		connected = true;
>>  	}
>>  
>> +	cec_notifier_set_phys_addr_from_edid(intel_hdmi->notifier, edid);
>> +
>>  	return connected;
>>  }
>>  
>> @@ -1876,6 +1878,7 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
>>  {
>>  	enum drm_connector_status status;
>>  	struct drm_i915_private *dev_priv = to_i915(connector->dev);
>> +	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
>>  
>>  	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
>>  		      connector->base.id, connector->name);
>> @@ -1891,6 +1894,9 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
>>  
>>  	intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);
>>  
>> +	if (status != connector_status_connected)
>> +		cec_notifier_phys_addr_invalidate(intel_hdmi->notifier);
>> +
>>  	return status;
>>  }
>>  
>> @@ -2358,6 +2364,10 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
>>  		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
>>  		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
>>  	}
>> +
>> +	intel_hdmi->notifier = cec_notifier_get_conn(dev->dev, connector->name);
>> +	if (!intel_hdmi->notifier)
>> +		DRM_DEBUG_KMS("CEC notifier get failed\n");
> 
> You 'get' the notifier here, but where is the cec_notifier_put when the connector is deleted?

Because I failed to find a safe place for this !

I will have a second look...

> 
> Regards,
> 
> 	Hans
> 
>>  }
>>  
>>  void intel_hdmi_init(struct drm_i915_private *dev_priv,
>>
>