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From: Alex Riesen <alexander.riesen@cetitec.com>
To: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: Kieran Bingham <kieran.bingham@ideasonboard.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>, <devel@driverdev.osuosl.org>,
	<linux-media@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<devicetree@vger.kernel.org>, <linux-renesas-soc@vger.kernel.org>
Subject: Re: [PATCH 2/8] media: adv748x: add audio mute control and output selection ioctls
Date: Fri, 13 Mar 2020 12:00:59 +0100	[thread overview]
Message-ID: <20200313110058.GG3832@pflmari> (raw)
In-Reply-To: <c260defe-bb3c-0dc2-476f-5cf8ff27b915@xs4all.nl>

Hans Verkuil, Fri, Mar 13, 2020 11:52:03 +0100:
> On 3/13/20 11:26 AM, Alex Riesen wrote:
> > Hans Verkuil, Fri, Mar 13, 2020 09:16:11 +0100:
> >> Generally an hdmi driver will configure the i2s audio automatically, which is
> >> typically connected to the SoC and controlled by the ALSA driver of the SoC,
> >> but there may well be missing features (audio never got a lot of attention in
> >> hdmi receivers). So what I would like to know is: what features are missing?
> > 
> > Well, the audio is missing. The current adv748x driver does not export the
> > audio features of the device at all. There is no code to enable the I2S audio
> > output and it is disabled (all clock and the data lines) by default.
> 
> Sorry, I was vague in my question. Obviously that needs to be added, but besides
> adding the low-level i2s support I was wondering if there are additional things
> that need to be exposed to userspace in order for audio to fully work.

None that I can't expose over the DAI interfaces: clocks, I2S format,
mute/demute ... All covered.

> >> Anything missing can likely be resolved by adding HDMI audio specific V4L2 controls,
> >> which would be the right approach for this.
> >>
> >> So I would expect to see a proposal for V4L2_CID_DV_RX_AUDIO_ controls to be
> >> added here:
> >>
> >> https://linuxtv.org/downloads/v4l-dvb-apis-new/uapi/v4l/ext-ctrls-dv.html
> > 
> > This seems to be an explicitly "digital video" control class. And it has no
> > control option for mute. Or did you mean a similarly structured new class for
> > "digital audio"?
> 
> There are no DV_ audio controls at all today. So any new audio controls would be
> added to the DV class. But if there is nothing that needs to be exposed, then
> nothing needs to be added :-)

Ah, alright. I shall keep an eye on it, maybe I shall find something to expose :)

Regards,
Alex

WARNING: multiple messages have this Message-ID
From: Alex Riesen <alexander.riesen@cetitec.com>
To: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: Mark Rutland <mark.rutland@arm.com>,
	devel@driverdev.osuosl.org, devicetree@vger.kernel.org,
	Kieran Bingham <kieran.bingham@ideasonboard.com>,
	linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
	Rob Herring <robh+dt@kernel.org>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	linux-media@vger.kernel.org
Subject: Re: [PATCH 2/8] media: adv748x: add audio mute control and output selection ioctls
Date: Fri, 13 Mar 2020 12:00:59 +0100	[thread overview]
Message-ID: <20200313110058.GG3832@pflmari> (raw)
In-Reply-To: <c260defe-bb3c-0dc2-476f-5cf8ff27b915@xs4all.nl>

Hans Verkuil, Fri, Mar 13, 2020 11:52:03 +0100:
> On 3/13/20 11:26 AM, Alex Riesen wrote:
> > Hans Verkuil, Fri, Mar 13, 2020 09:16:11 +0100:
> >> Generally an hdmi driver will configure the i2s audio automatically, which is
> >> typically connected to the SoC and controlled by the ALSA driver of the SoC,
> >> but there may well be missing features (audio never got a lot of attention in
> >> hdmi receivers). So what I would like to know is: what features are missing?
> > 
> > Well, the audio is missing. The current adv748x driver does not export the
> > audio features of the device at all. There is no code to enable the I2S audio
> > output and it is disabled (all clock and the data lines) by default.
> 
> Sorry, I was vague in my question. Obviously that needs to be added, but besides
> adding the low-level i2s support I was wondering if there are additional things
> that need to be exposed to userspace in order for audio to fully work.

None that I can't expose over the DAI interfaces: clocks, I2S format,
mute/demute ... All covered.

> >> Anything missing can likely be resolved by adding HDMI audio specific V4L2 controls,
> >> which would be the right approach for this.
> >>
> >> So I would expect to see a proposal for V4L2_CID_DV_RX_AUDIO_ controls to be
> >> added here:
> >>
> >> https://linuxtv.org/downloads/v4l-dvb-apis-new/uapi/v4l/ext-ctrls-dv.html
> > 
> > This seems to be an explicitly "digital video" control class. And it has no
> > control option for mute. Or did you mean a similarly structured new class for
> > "digital audio"?
> 
> There are no DV_ audio controls at all today. So any new audio controls would be
> added to the DV class. But if there is nothing that needs to be exposed, then
> nothing needs to be added :-)

Ah, alright. I shall keep an eye on it, maybe I shall find something to expose :)

Regards,
Alex
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  reply	other threads:[~2020-03-13 11:01 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-13 14:19 [PATCH 0/8] media: i2c: adv748x: add support for HDMI audio Alex Riesen
2020-01-13 14:19 ` Alex Riesen
2020-01-13 14:15 ` [PATCH 1/8] media: adv748x: add a device-specific wrapper for register block read Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-01-13 14:15 ` [PATCH 2/8] media: adv748x: add audio mute control and output selection ioctls Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-03-13  8:16   ` Hans Verkuil
2020-03-13  8:16     ` Hans Verkuil
2020-03-13 10:26     ` Alex Riesen
2020-03-13 10:26       ` Alex Riesen
2020-03-13 10:52       ` Hans Verkuil
2020-03-13 10:52         ` Hans Verkuil
2020-03-13 11:00         ` Alex Riesen [this message]
2020-03-13 11:00           ` Alex Riesen
2020-01-13 14:15 ` [PATCH 3/8] media: adv748x: add log_status ioctl Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-01-13 14:15 ` [PATCH 4/8] media: adv748x: reserve space for the audio (I2S) port in the driver structures Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-01-13 14:15 ` [PATCH 5/8] media: adv748x: add an ASoC DAI definition to the driver Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-01-13 14:15 ` [PATCH 6/8] media: adv748x: reduce amount of code for bitwise modification of device registers Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-01-13 14:15 ` [PATCH 7/8] dt-bindings: adv748x: add information about serial audio interface (I2S/TDM) Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-01-13 22:32   ` Rob Herring
2020-01-13 22:32     ` Rob Herring
2020-01-13 14:15 ` [PATCH 8/8] arm64: dts: renesas: salvator: add a connection from adv748x codec (HDMI input) to the R-Car SoC Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-03-02 12:28   ` Geert Uytterhoeven
2020-03-02 12:28     ` Geert Uytterhoeven
2020-03-02 13:40     ` Alex Riesen
2020-03-02 13:40       ` Alex Riesen
2020-03-02 13:47       ` Geert Uytterhoeven
2020-03-02 13:47         ` Geert Uytterhoeven
2020-03-02 15:07         ` Alex Riesen
2020-03-02 15:07           ` Alex Riesen
2020-03-02 15:32           ` Geert Uytterhoeven
2020-03-02 15:32             ` Geert Uytterhoeven
2020-03-02 16:09             ` Alex Riesen
2020-03-02 16:09               ` Alex Riesen
2020-03-02 16:13               ` Geert Uytterhoeven
2020-03-02 16:13                 ` Geert Uytterhoeven
2020-03-05 14:36                 ` Alex Riesen
2020-03-05 14:36                   ` Alex Riesen
2020-03-06 12:21                   ` Geert Uytterhoeven
2020-03-06 12:21                     ` Geert Uytterhoeven
2020-03-06 13:16                   ` Laurent Pinchart
2020-03-06 13:16                     ` Laurent Pinchart
2020-03-06 13:41                     ` Alex Riesen
2020-03-06 13:41                       ` Alex Riesen
2020-03-06 13:45                       ` Laurent Pinchart
2020-03-06 13:45                         ` Laurent Pinchart
2020-03-09  1:31                         ` Kuninori Morimoto
2020-03-09  1:31                           ` Kuninori Morimoto
2020-03-09 11:09                           ` Alex Riesen
2020-03-09 11:09                             ` Alex Riesen
2020-03-10  1:07                             ` Kuninori Morimoto
2020-03-10  1:07                               ` Kuninori Morimoto
2020-03-10  8:17                               ` Alex Riesen
2020-03-10  8:17                                 ` Alex Riesen
2020-03-10 10:39                                 ` Laurent Pinchart
2020-03-10 10:39                                   ` Laurent Pinchart

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