mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2025-01-26 07:44:27 +08:00
f8ac2cf78f
function: get current DP PHY settings: voltage swing, pre-emphasis, post-cursor2 (defined by VESA DP specification) valid values: voltage swing: 0,1,2,3 pre-emphasis : 0,1,2,3 post cursor2 : 0,1,2,3 debugfs file phy_setings is located at /sys/kernel/debug/dri/0/DP-x there will be directories, like DP-1, DP-2,DP-3, etc. for DP display --- to figure out which DP-x is the display for DP to be check, cd DP-x ls -ll There should be debugfs file, like link_settings, phy_settings. cat link_settings from lane_count, link_rate to figure which DP-x is for display to be worked on --- to get current DP PHY settings, cat phy_settings --- to change DP PHY settings, echo <voltage_swing> <pre-emphasis> <post_cursor2> > phy_settings for examle, to change voltage swing to 2, pre-emphasis to 3, post_cursor2 to 0, echo 2 3 0 > phy_settings --- to check if change be applied, get current phy settings by cat phy_settings --- in case invalid values are set by user, like echo 1 4 0 > phy_settings HW will NOT be programmed by these settings. cat phy_settings will show the previous valid settings. Signed-off-by: Hersen Wu <hersenxs.wu@amd.com> Reviewed-by: Harry Wentland <Harry.Wentland@amd.com> Reviewed-by: Hersen Wu <hersenxs.wu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> |
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.