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| author |   Maxime Ripard <maxime@cerno.tech> | 2021-06-23 14:12:13 +0200 |
|---|---|---|
| committer | Maxime Ripard <maxime@cerno.tech> | 2021-06-23 14:32:27 +0200 |
| commit | ecd3ee3d0c734b9454fc59cbe268c6be26f369e8 (patch) | |
| tree | 0f4c7fe579849a82eabed1f069d8d96b3f21c4e1 /Documentation | |
| parent | drm: Mention the power state requirement on side-channel operations (diff) | |
| parent | ASoC: hdmi-codec: Add a prepare hook (diff) | |
| download | linux-dev-ecd3ee3d0c734b9454fc59cbe268c6be26f369e8.tar.xz linux-dev-ecd3ee3d0c734b9454fc59cbe268c6be26f369e8.zip | |
Merge tag 'asoc-hdmi-codec-improvements-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux into drm-misc-next
Improvements to the hdmi-codec driver and ALSA infrastructure around it
to support the HDMI Channel Mapping and IEC958 controls
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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# gpg: Signature made Thu 10 Jun 2021 12:00:21 PM CEST
# gpg: using EDDSA key 5C1337A45ECA9AEB89060E9EE3EF0D6F671851C5
# gpg: Good signature from "Maxime Ripard <maxime.ripard@anandra.org>" [unknown]
# gpg: aka "Maxime Ripard <mripard@kernel.org>" [unknown]
# gpg: aka "Maxime Ripard (Work Address) <maxime@cerno.tech>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg: There is no indication that the signature belongs to the owner.
# Primary key fingerprint: BE56 75C3 7E81 8C8B 5764 241C 254B CFC5 6BF6 CE8D
# Subkey fingerprint: 5C13 37A4 5ECA 9AEB 8906 0E9E E3EF 0D6F 6718 51C5
From: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210610122550.jnriewchqspdcrwk@gilmour
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/sound/kernel-api/writing-an-alsa-driver.rst | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/Documentation/sound/kernel-api/writing-an-alsa-driver.rst b/Documentation/sound/kernel-api/writing-an-alsa-driver.rst index e6365836fa8b..01d59b8aea92 100644 --- a/Documentation/sound/kernel-api/writing-an-alsa-driver.rst +++ b/Documentation/sound/kernel-api/writing-an-alsa-driver.rst @@ -3508,14 +3508,15 @@ field must be set, though). “IEC958 Playback Con Mask” is used to return the bit-mask for the IEC958 status bits of consumer mode. Similarly, “IEC958 Playback Pro Mask” -returns the bitmask for professional mode. They are read-only controls, -and are defined as MIXER controls (iface = -``SNDRV_CTL_ELEM_IFACE_MIXER``). +returns the bitmask for professional mode. They are read-only controls. Meanwhile, “IEC958 Playback Default” control is defined for getting and -setting the current default IEC958 bits. Note that this one is usually -defined as a PCM control (iface = ``SNDRV_CTL_ELEM_IFACE_PCM``), -although in some places it's defined as a MIXER control. +setting the current default IEC958 bits. + +Due to historical reasons, both variants of the Playback Mask and the +Playback Default controls can be implemented on either a +``SNDRV_CTL_ELEM_IFACE_PCM`` or a ``SNDRV_CTL_ELEM_IFACE_MIXER`` iface. +Drivers should expose the mask and default on the same iface though. In addition, you can define the control switches to enable/disable or to set the raw bit mode. The implementation will depend on the chip, but |