mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-05 18:41:58 +09:00
42568b67f3
BACKGROUND
A short clk giltch (~200us) found on the mclk calibrate case in
kernel 5.10.
mclk-12.288M - mclk-49.152M (~200us) - mclk-12.288M
The root cause is:
clk_set_rate(mclk_parent, 49.152M)
clk_set_rate(mclk, 12.288M)
Prefer to get the mclk rate div from mclk_parent rate, Unfortunately,
the latter will change the mclk_parent rate again in kernel 5.10.
So, do not change mclk parent's rate when it is multiple mclk already,
let clk framework handle it.
e.g.
mclk: clk_i2s1_8ch_tx mclk_parent: clk_i2s_8ch_tx_src
clk_i2s1_8ch_tx_src 0 0 0 12288000
clk_i2s1_8ch_tx_mux 0 0 0 12288000
clk_i2s1_8ch_rx 0 0 0 12288000
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Change-Id: Ie9e869a48b65e287e60545626e92c9090ab02229
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.