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For a specific case, there will be unexpected abnormal display: If the logo display is disabled and the cubit lut is updated before refreshing the first frame, the cubit lut function will be abnormal along with display abnormalities. The reason is: The 3D look-up table is allocated via iommu while the flag &vop2->is_iommu_needed, which to initialize the iommu, is first set before refreshing the first frame. Therefore, for the above case, the cubit lut function is working without iommu initialized. Through analysis of the code logic, we found that the flag &vop2->is_iommu_needed is redundant. After removing it, the iommu will be enabled at the same time as the first atomic flush operation, which may refresh the frame or not. What's more, this method also help to avoid the cubit lut abnormal issue in above case. Change-Id: I196c1652798164690bedbe6cc4c5fce265f1e178 Signed-off-by: Damon Ding <damon.ding@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.