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e219b757a2
In upstream patch, runtime pm is used to avoid excessive unprepare/
prepare.
However, some DSI panels need to be powered off and on again before
reloading the initialization sequence. If set the auto_suspend and
delay time is set to 1s, the suspend/resume callback function cannot
be entered when sleeping/waking up quickly, the power of panel cannot
be restarted, causing this timing to be abnormal and causing the panel
to not work properly.
In kernel 5.10, pm_runtime has not been used in panel-simple, but it
still runs stably in panel applications. Considering the above
reasons, we chose to revert the submission of pm_runtime upstream.
Type: Fix
Redmine ID: 460825 468692
Associated modifications:
commit 3235b0f20a ("drm/panel: panel-simple: Use runtime pm to
avoid excessive unprepare / prepare")
Test: N/A
Signed-off-by: Zhibin Huang <zhibin.huang@rock-chips.com>
Change-Id: I348e1a860e528cf4bee7ce76de0ea13c18fddd90
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.