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Christian Hewitt e2576c8bdf clk: meson-gxbb: set fclk_div3 as CLK_IS_CRITICAL 
On the Khadas VIM2 (GXM) and LePotato (GXL) board there are problems
with reboot; e.g. a ~60 second delay between issuing reboot and the
board power cycling (and in some OS configurations reboot will fail
and require manual power cycling).

Similar to 'commit c987ac6f1f ("clk:
meson-gxbb: set fclk_div2 as CLK_IS_CRITICAL")' the SCPI Cortex-M4
Co-Processor seems to depend on FCLK_DIV3 being operational.

Until commit 05f814402d ("clk:
meson: add fdiv clock gates"), this clock was modeled and left on by
the bootloader.

We don't have precise documentation about the SCPI Co-Processor and
its clock requirement so we are learning things the hard way.

Marking this clock as critical solves the problem but it should not
be viewed as final solution. Ideally, the SCPI driver should claim
these clocks. We also depends on some clock hand-off mechanism
making its way to CCF, to make sure the clock stays on between its
registration and the SCPI driver probe.

Fixes: 05f814402d ("clk: meson: add fdiv clock gates")
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2018-11-08 10:12:46 -08:00
arch
block
certs
crypto
Documentation This pull request contains updates for UBIFS: 2018-11-04 14:46:04 -08:00
drivers clk: meson-gxbb: set fclk_div3 as CLK_IS_CRITICAL 2018-11-08 10:12:46 -08:00
firmware
fs This pull request contains updates for UBIFS: 2018-11-04 14:46:04 -08:00
include NFS client bugfixes for Linux 4.20 2018-11-04 08:20:09 -08:00
init
ipc
kernel Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-11-03 18:37:09 -07:00
lib
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net NFS client bugfixes for Linux 4.20 2018-11-04 08:20:09 -08:00
samples
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usr
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Makefile Linux 4.20-rc1 2018-11-04 15:37:52 -08:00
README

README 

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.