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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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Kai Vehmanen
dcaba7b281
[ Upstream commita3d6d3cedf] When a keep-alive (KAE) silent stream is active on an Intel HDMI/DP codec, opening a real PCM stream reprograms the converter format and the audio infoframe in snd_hda_hdmi_generic_pcm_prepare(). Part of that reprogramming - the converter channel count and the channel mapping in snd_hda_hdmi_setup_audio_infoframe() - is not safe to do while a keep-alive stream is active. This is most visible when switching to a multichannel PCM configuration, where the active channel count actually changes. In that case the newly opened PCM stream plays no sound. Add an optional hdmi_ops .prepare hook, called at the start of the PCM prepare sequence (before the format and infoframe are touched), and implement it for HSW+ to release keep-alive. Keep-alive is then re-enabled as before once the new stream has been set up, in the setup_stream op. Fixes:15175a4f2b("ALSA: hda/hdmi: add keep-alive support for ADL-P and DG2") Reported-by: Alexander Kaplan <alexander.kaplan@sms-medipool.de> Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/work_items/8412 Tested-by: Alexander Kaplan <alexander.kaplan@sms-medipool.de> Cc: <stable@vger.kernel.org> Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> Link: https://patch.msgid.link/20260715180610.1371243-1-kai.vehmanen@linux.intel.com Signed-off-by: Takashi Iwai <tiwai@suse.de> [ adapted three hunks from the post-6.12 split files (hdmi.c/hdmi_local.h/intelhdmi.c) back into the monolithic sound/pci/hda/patch_hdmi.c, with the prepare hook un-indented one level since 6.12 uses plain mutex_lock() instead of scoped_guard() ] Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.