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0c5249aab1
Current policy:
If there are two pending config done vp, and one of them is
at critical time zone, wait for the one wich has long time
to vsync.
This may lead a very long wait, for example: VP0 is 3840 x 2160,
VP2 is 1920 x 1080, they are all have pending cfg done bits,
and the vcnt of VP0 is 1367, the vcnt of VP2 is 995, VP2 is
at the critical time zone, we will wait VP0 vsync(almost half frame time)
according to this policy. This lead a very long wait.
The new policy:
If there are two pending config done vp, and one of them is
at critical time zone, compare the left vcnt time of the
two vp:
if (first_vp_left_time > second_vp_left_time) {
if ((first_vp_left_time - second_vp_left_time) > first_vp_safe_time)
wait_vp = second_done_vp;
else
wait_vp = first_done_vp;
} else {
if ((second_vp_left_time - first_vp_left_time) > second_vp_safe_time)
wait_vp = first_done_vp;
else
wait_vp = second_done_vp;
}
Change-Id: I7154ad716841c6c28947ddfecc845c7271cc507a
Signed-off-by: Andy Yan <andy.yan@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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.