Zhen Chen fb4e66e115 android: ion: pass in DMA_ATTR_SKIP_CPU_SYNC when calling dma_(un)map_sg_attrs()
Imitate the behaviors of drm_gem_map_detach() and drm_gem_map_dma_buf().
Graphics performance of rk3399 device using ion without this modification,
was quite poor.

Change-Id: Ia0b8e2f3026a61ee4addee9c1715291886fa1c99
Signed-off-by: Zhen Chen <chenzhen@rock-chips.com>
2021-01-29 16:20:50 +08:00
2019-02-10 00:33:21 +08:00
2019-02-10 00:33:21 +08:00
2019-02-10 00:33:21 +08:00
2019-08-29 19:45:37 +08:00
2019-08-29 19:45:37 +08:00

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.
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