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On some Lenovo and HP laptops, if both codec driver and SOF driver are in runtime suspend mode, we plug a headset to the audio jack, the headphone could be detected but Mic couldn't. That is because when plugging, the headphone triggers a unsol event first, and about 0.7s later (on the Lenovo X1 Carbon 7th), the Mic triggers a unsol event. But if the codec driver enters runtime suspend within 0.7s, the Mic can't trigger the unsol event. If we don't set autosuspend_delay to a non-zero value for the hda codec driver, it will enter runtime suspend immediately after the headphone triggers the unsol event. Follow the sequence of legacy hda driver and set a autosuspend delay of 1sec after card registration (refer to pci/hda/hda_intel.c and pci/hda/hda_codec.c). Co-developed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> Co-developed-by: Jaska Uimonen <jaska.uimonen@linux.intel.com> Signed-off-by: Hui Wang <hui.wang@canonical.com> Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> Signed-off-by: Jaska Uimonen <jaska.uimonen@linux.intel.com> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com> Reviewed-by: Clarex Zhou <clarex.zhou@intel.com> Link: https://lore.kernel.org/r/20200409185827.16255-3-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.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.