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BT1120 dec clk is a 4-bit integer division, which is inaccurate in most resolutions. For example, In bt1120->HDMI 1024x768@60Hz scenario, the actual required clk frequency is 65MHz, while the CPLL frequency is 1188MHz. After frequency division, the obtained frequency is 62.5MHz, which deviates too much from the actual clk and causes the screen to be unable to display. So if the frequency division is not accurate, apply for a fault tolerance of up 2% in frequency setting, so that the obtained frequency is slightly higher than the actual required clk, so that the deviation between the actual clk and the required clk frequency is not significant. Type: Fix Redmine ID: N/A Associated modifications: N/A Test: N/A Signed-off-by: Zhibin Huang <zhibin.huang@rock-chips.com> Change-Id: Ib04c55d60211ea0cdc56a3bcc3ce49db1ceef8a8
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.