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When the dsc bpp is less than 9, hdmi output will flash on TV. It is speculated that the reason is that pixel rate of sink decoding is not enough. Taking 8bpp as an example, dsc clk needs to be 1/3 of the input clk.the theoretical calculation of DEN compression 1/3, at this time, the clk of vop dsc to hdmi tx can be reduced to about 260M to meet the 8bpp transmission. RK3588 dsc clk only supports 1/2 frequency division, so dsc clk is 1/2 input clk, which needs to increase blank, which is equivalent to compressing the absolute DEN time. TV is likely to decode at a decoding rate of around 260M. DEN absolute time shortening results in abnormal TV decoding. So the value of hblank needs to be reduced when bpp is below 9. The measurement can be displayed normally on TV, but reducing the hblank will result in non-standard timing of the hdmi output. This may cause compatibility issues and hdmi cts certification may fail. Change-Id: I6cd7890c62980c29322c437b20fb048fe0acbae3 Signed-off-by: Algea Cao <algea.cao@rock-chips.com>
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.