linux-kernel - Re: [Intel-gfx] [PATCH v2 2/5] drm/i915: hdmi: add CEC notifier to intel_hdmi

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Date:   Wed, 16 May 2018 09:40:17 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:     airlied@...ux.ie, hans.verkuil@...co.com, lee.jones@...aro.org,
        olof@...om.net, seanpaul@...gle.com, sadolfsson@...gle.com,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, fparent@...libre.com,
        felixe@...gle.com, bleung@...gle.com, darekm@...gle.com,
        linux-media@...r.kernel.org
Subject: Re: [Intel-gfx] [PATCH v2 2/5] drm/i915: hdmi: add CEC notifier to
 intel_hdmi

On 16/05/2018 09:31, Neil Armstrong wrote:
> Hi Ville,
> 
> On 15/05/2018 17:35, Ville Syrjälä wrote:
>> On Tue, May 15, 2018 at 04:42:19PM +0200, 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/Kconfig      |  1 +
>>>  drivers/gpu/drm/i915/intel_drv.h  |  2 ++
>>>  drivers/gpu/drm/i915/intel_hdmi.c | 12 ++++++++++++
>>>  3 files changed, 15 insertions(+)
>>>
> 
> [..]
> 
>>>  }
>>>  
>>> @@ -2031,6 +2037,8 @@ static void chv_hdmi_pre_enable(struct intel_encoder *encoder,
>>>  
>>>  static void intel_hdmi_destroy(struct drm_connector *connector)
>>>  {
>>> +	if (intel_attached_hdmi(connector)->notifier)
>>> +		cec_notifier_put(intel_attached_hdmi(connector)->notifier);
>>>  	kfree(to_intel_connector(connector)->detect_edid);
>>>  	drm_connector_cleanup(connector);
>>>  	kfree(connector);
>>> @@ -2358,6 +2366,10 @@ 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);
>>
>> What are we doing with the connector name here? Those are not actually
>> guaranteed to be stable, and any change in the connector probe order
>> may cause the name to change.
> 
> The i915 driver can expose multiple HDMI connectors, but each connected will
> have a different EDID and CEC physical address, so we will need a different notifier
> for each connector.
> 
> The connector name is DRM dependent, but user-space actually uses this name for
> operations, so I supposed it was kind of stable.
> 
> Anyway, is there another stable id/name/whatever that can be used to make a name to
> distinguish the HDMI connectors ?

Would "HDMI %c", port_name(port) be OK to use ?

Neil

> 
> Neil
> 
>>
>>> +	if (!intel_hdmi->notifier)
>>> +		DRM_DEBUG_KMS("CEC notifier get failed\n");
>>>  }
>>>  
>>>  void intel_hdmi_init(struct drm_i915_private *dev_priv,
>>> -- 
>>> 2.7.4
>>>
>>> _______________________________________________
>>> Intel-gfx mailing list
>>> Intel-gfx@...ts.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>>
> 

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