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From: Eric Anholt <eric@anholt.net>
To: Stefan Wahren <stefan.wahren@i2se.com>,
	Maxime Ripard <maxime.ripard@bootlin.com>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Sean Paul <seanpaul@chromium.org>,
	Daniel Vetter <daniel.vetter@intel.com>,
	David Airlie <airlied@linux.ie>
Cc: Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
	linux-arm-kernel@lists.infradead.org,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	dri-devel@lists.freedesktop.org, eben@raspberrypi.org
Subject: Re: [PATCH 1/7] drm/vc4: hdmi: Check that the monitor supports HDMI audio
Date: Mon, 04 Mar 2019 13:09:19 -0800	[thread overview]
Message-ID: <877edeuz28.fsf@anholt.net> (raw)
In-Reply-To: <1185446515.301320.1551729991062@email.ionos.de>


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Stefan Wahren <stefan.wahren@i2se.com> writes:

>> Eric Anholt <eric@anholt.net> hat am 4. März 2019 um 19:28 geschrieben:
>> 
>> 
>> Stefan Wahren <stefan.wahren@i2se.com> writes:
>> 
>> > Hi Maxime,
>> >
>> > Am 04.03.2019 um 15:52 schrieb Maxime Ripard:
>> >> The current code assumes as soon as the device is an HDMI one that it
>> >> supports an audio sink. However, strictly speaking, this is exposed as a
>> >> separate part of EDID.
>> >>
>> >> This can be checked through the drm_detect_monitor_audio function, so let's
>> >> use it and make sure that we can use the HDMI monitor as an output before
>> >> sending sound.
>> >
>> > does the audio output work in the following setup after applying this patch?
>> >
>> > VC4 --- HDMI Audio extractor --- Non audio capable monitor
>> 
>> A 1-minute google of audio extractors says they manage the EDID.  Do you
>> have some reason to think this wouldn't work?
>
> My only concern is the existence of some audio extractors which doesn't care about EDID. I that case we need to provide some kind of force switch.

I'm having a hard time imagining such a product existing, given that I
don't think Windows will have "ignore the EDID, force audio anyway"
switches in their UIs.

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_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Eric Anholt <eric@anholt.net>
To: Stefan Wahren <stefan.wahren@i2se.com>,
	Maxime Ripard <maxime.ripard@bootlin.com>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Sean Paul <seanpaul@chromium.org>,
	Daniel Vetter <daniel.vetter@intel.com>,
	David Airlie <airlied@linux.ie>
Cc: Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
	linux-arm-kernel@lists.infradead.org,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	dri-devel@lists.freedesktop.org, eben@raspberrypi.org
Subject: Re: [PATCH 1/7] drm/vc4: hdmi: Check that the monitor supports HDMI audio
Date: Mon, 04 Mar 2019 13:09:19 -0800	[thread overview]
Message-ID: <877edeuz28.fsf@anholt.net> (raw)
In-Reply-To: <1185446515.301320.1551729991062@email.ionos.de>


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Stefan Wahren <stefan.wahren@i2se.com> writes:

>> Eric Anholt <eric@anholt.net> hat am 4. März 2019 um 19:28 geschrieben:
>> 
>> 
>> Stefan Wahren <stefan.wahren@i2se.com> writes:
>> 
>> > Hi Maxime,
>> >
>> > Am 04.03.2019 um 15:52 schrieb Maxime Ripard:
>> >> The current code assumes as soon as the device is an HDMI one that it
>> >> supports an audio sink. However, strictly speaking, this is exposed as a
>> >> separate part of EDID.
>> >>
>> >> This can be checked through the drm_detect_monitor_audio function, so let's
>> >> use it and make sure that we can use the HDMI monitor as an output before
>> >> sending sound.
>> >
>> > does the audio output work in the following setup after applying this patch?
>> >
>> > VC4 --- HDMI Audio extractor --- Non audio capable monitor
>> 
>> A 1-minute google of audio extractors says they manage the EDID.  Do you
>> have some reason to think this wouldn't work?
>
> My only concern is the existence of some audio extractors which doesn't care about EDID. I that case we need to provide some kind of force switch.

I'm having a hard time imagining such a product existing, given that I
don't think Windows will have "ignore the EDID, force audio anyway"
switches in their UIs.

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_______________________________________________
dri-devel mailing list
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https://lists.freedesktop.org/mailman/listinfo/dri-devel

  reply	other threads:[~2019-03-04 21:09 UTC|newest]

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-04 14:52 [PATCH 0/7] drm/vc4: Allow for more boot-time configuration Maxime Ripard
2019-03-04 14:52 ` Maxime Ripard
2019-03-04 14:52 ` [PATCH 1/7] drm/vc4: hdmi: Check that the monitor supports HDMI audio Maxime Ripard
2019-03-04 14:52   ` Maxime Ripard
2019-03-04 15:10   ` Paul Kocialkowski
2019-03-04 15:10     ` Paul Kocialkowski
2019-03-04 15:54   ` Stefan Wahren
2019-03-04 15:54     ` Stefan Wahren
2019-03-04 18:28     ` Eric Anholt
2019-03-04 18:28       ` Eric Anholt
2019-03-04 20:06       ` Stefan Wahren
2019-03-04 20:06         ` Stefan Wahren
2019-03-04 21:09         ` Eric Anholt [this message]
2019-03-04 21:09           ` Eric Anholt
2019-03-04 14:52 ` [PATCH 2/7] drm/edid: Allow to ignore the audio EDID data Maxime Ripard
2019-03-04 14:52   ` Maxime Ripard
2019-03-04 15:47   ` Jani Nikula
2019-03-04 15:47     ` Jani Nikula
2019-03-04 15:51     ` Adam Jackson
2019-03-04 15:51       ` Adam Jackson
2019-03-05  8:08     ` Maxime Ripard
2019-03-05  8:08       ` Maxime Ripard
2019-03-05 10:33       ` Jani Nikula
2019-03-05 10:33         ` Jani Nikula
2019-03-05 15:08       ` Adam Jackson
2019-03-05 15:08         ` Adam Jackson
2019-03-04 15:59   ` Ville Syrjälä
2019-03-04 15:59     ` Ville Syrjälä
2019-03-04 19:53   ` Eric Anholt
2019-03-04 19:53     ` Eric Anholt
2019-03-04 20:05     ` Alex Deucher
2019-03-04 20:05       ` Alex Deucher
2019-03-05  9:12       ` Maxime Ripard
2019-03-05  9:12         ` Maxime Ripard
2019-03-05 15:24         ` Ville Syrjälä
2019-03-05 15:24           ` Ville Syrjälä
2019-03-05 19:15           ` Ville Syrjälä
2019-03-05 19:15             ` Ville Syrjälä
2019-03-05 19:21             ` Alex Deucher
2019-03-05 19:36               ` Ville Syrjälä
2019-03-05 19:36                 ` Ville Syrjälä
2019-03-13 10:44                 ` Takashi Iwai
2019-03-13 10:44                   ` Takashi Iwai
2019-03-13 14:03                   ` Maxime Ripard
2019-03-13 14:03                     ` Maxime Ripard
2019-03-05 18:11         ` Eric Anholt
2019-03-05 18:11           ` Eric Anholt
2019-03-11 13:07           ` Daniel Vetter
2019-03-11 13:07             ` Daniel Vetter
2019-03-05 21:47         ` Eric Anholt
2019-03-05 21:47           ` Eric Anholt
2019-03-06  8:52           ` Maxime Ripard
2019-03-06  8:52             ` Maxime Ripard
2019-03-06 13:22           ` Maxime Ripard
2019-03-06 13:22             ` Maxime Ripard
2019-03-06 17:51             ` Eric Anholt
2019-03-06 17:51               ` Eric Anholt
2019-03-04 14:52 ` [PATCH 3/7] drm/edid: Allow to ignore the HDMI monitor mode Maxime Ripard
2019-03-04 14:52   ` Maxime Ripard
2019-03-04 15:14   ` Paul Kocialkowski
2019-03-04 15:14     ` Paul Kocialkowski
2019-03-04 15:48   ` Jani Nikula
2019-03-04 15:48     ` Jani Nikula
2019-03-04 20:02   ` Eric Anholt
2019-03-04 20:02     ` Eric Anholt
2019-03-05  9:24     ` Maxime Ripard
2019-03-05  9:24       ` Maxime Ripard
2019-03-04 14:52 ` [PATCH 4/7] drm/modes: Rewrite the command line parser Maxime Ripard
2019-03-04 14:52   ` Maxime Ripard
2019-03-04 14:52 ` [PATCH 5/7] drm/modes: Support modes names on the command line Maxime Ripard
2019-03-04 14:52   ` Maxime Ripard
2019-03-04 14:52 ` [PATCH 6/7] drm/modes: Allow to specify rotation and reflection on the commandline Maxime Ripard
2019-03-04 14:52   ` Maxime Ripard
2019-03-04 14:52 ` [PATCH 7/7] drm/modes: Parse overscan properties Maxime Ripard
2019-03-04 14:52   ` Maxime Ripard
2019-03-04 15:21 ` [PATCH 0/7] drm/vc4: Allow for more boot-time configuration Peter Stuge
2019-03-04 15:21   ` Peter Stuge
2019-03-04 15:56   ` Maxime Ripard
2019-03-04 15:56     ` Maxime Ripard
2019-03-04 15:44 ` Stefan Wahren
2019-03-04 15:44   ` Stefan Wahren
2019-03-04 20:06 ` Eric Anholt
2019-03-04 20:06   ` Eric Anholt
2019-03-05  9:14   ` Maxime Ripard
2019-03-05  9:14     ` Maxime Ripard
2019-03-11 13:00     ` Daniel Vetter
2019-03-11 13:00       ` Daniel Vetter

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