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e6548795bb
punit_ddr_dvfs_enable() is only used on CHT devices and there dmesg gets filled with: "DDR DVFS, door bell is not cleared within 3ms" messages, so clearly the doorbell checking is not working. This check was added by: https://github.com/intel/ProductionKernelQuilts/blob/master/uefi/cht-m1stable/patches/cam-0340-atomisp-add-door-bell-for-ddr-dvfs-on-cht.patch Which commit message says: "PUNIT interface added to check Req_ACK of freq status". This suggests that the doorbell mechanism may only be available with certain PUNIT fw versions and it seems that many CHT devices do not have this fw version; that or the doorbell mechanism is not working for other reasons. Revert cam-0340-atomisp-add-door-bell-for-ddr-dvfs-on-cht.patch, replacing the doorbell check with a msleep(20) this fixes dmesg getting filled with error messages. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@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.