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Currently, the init_code of the jd9365da driver is placed in the enable() function and sent, but this seems to take a long time. It takes 17ms to send each instruction (an init code consists of about 200 instructions), so it takes about 3.5s to send the init_code. So we moved the sending of the inti_code to the prepare() function, and each instruction seemed to take only 25μs. We checked the DSI host and found that the difference in command sending time is caused by the different modes of the DSI host in prepare() and enable() functions. Our DSI Host only supports sending cmd in LP mode, The prepare() function can directly send init_code (LP->cmd) in LP mode, but the enable() function is in HS mode and needs to switch to LP mode before sending init code (HS->LP->cmd->HS). Therefore, it takes longer to send the command. Signed-off-by: Zhaoxiong Lv <lvzhaoxiong@huaqin.corp-partner.google.com> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://lore.kernel.org/r/20240624141926.5250-2-lvzhaoxiong@huaqin.corp-partner.google.com Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20240624141926.5250-2-lvzhaoxiong@huaqin.corp-partner.google.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 reStructuredText 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.