mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-05 10:31:46 +09:00
0d42457e7e
As the Table 4-24 in eDP 1.4 spec, the Sink device can only support
Main-Link rate selection via SUPPORTED_LINK_RATES when the value of
DPCD MAX_LINK_RATE is 00h. If MAX_LINK_RATE and SUPPORTED_LINK_RATES
are both non-zero, the Sink device can support both methods.
In practice, if MAX_LINK_RATE is not 00h and SUPPORTED_LINK_RATES
contains non-zero values, sometimes the sink device can only support
to set link rate via LINK_BW_SET. In such case, there will be errors
if set the link rate read from SUPPORTED_LINK_RATES to LINK_RATE_SET.
The panel vendor may explain this is to ensure the same Sink firmware
remains compatible across different versions of the eDP spec. Or the
Main-Link rate selection method has not been fully verified.
In order to avoid these unexpected cases, MAX_LINK_RATE/LINK_BW_SET
method will be selected first if MAX_LINK_RATE is non-zero for eDP
panels that support v1.4 or higher.
Previous patch for link rate table parsing:
commit 31702584f8 ("drm/bridge: analogix_dp: add support to parse link rate for eDP v1.4")
Change-Id: Ic8aedcec2c60584fedddc575b2a91c2eba7c8219
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.