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 (diff)
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
_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
next prev parent 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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200313110058.GG3832@pflmari \
--to=alexander.riesen@cetitec.com \
--cc=devel@driverdev.osuosl.org \
--cc=devicetree@vger.kernel.org \
--cc=hverkuil-cisco@xs4all.nl \
--cc=kieran.bingham@ideasonboard.com \
--cc=laurent.pinchart@ideasonboard.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=linux-renesas-soc@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=mchehab@kernel.org \
--cc=robh+dt@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.