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Ilya Bakoulin 2faa3653d6 drm/amd/display: Work around bad DPCD state on link loss
[Why]
This display doesn't properly indicate link loss through DPCD bits such
as CR_DONE / CHANNEL_EQ_DONE / SYMBOL_LOCKED / INTERLANE_ALIGN_DONE,
which all remain set.

In addition, DPCD200Eh doesn't match the value of DPCD204h in all cases.

For these reasons, we can miss re-training the link, since we don't
properly detect link loss with this display.

[Why]
Add display-specific workaround to read DPCD204h, so that we can detect
link loss based on 128b132b-specific status bits in this register.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Ilya Bakoulin <ilya.bakoulin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2023-06-30 13:11:35 -04:00
arch Linux 6.4-rc7 2023-06-19 16:01:25 +10:00
block blk-cgroup: Flush stats before releasing blkcg_gq 2023-06-11 19:49:29 -06:00
certs
crypto KEYS: asymmetric: Copy sig and digest in public_key_verify_signature() 2023-06-02 15:36:23 +02:00
Documentation Merge tag 'drm-msm-next-2023-06-18' of https://gitlab.freedesktop.org/drm/msm into drm-next 2023-06-19 16:01:46 +10:00
drivers drm/amd/display: Work around bad DPCD state on link loss 2023-06-30 13:11:35 -04:00
fs afs: Fix vlserver probe RTT handling 2023-06-16 14:43:41 -07:00
include Merge tag 'drm-msm-next-2023-06-18' of https://gitlab.freedesktop.org/drm/msm into drm-next 2023-06-19 16:01:46 +10:00
init
io_uring io_uring/io-wq: clear current->worker_private on exit 2023-06-14 12:54:55 -06:00
ipc
kernel 19 hotfixes. 14 are cc:stable and the remainder address issues which were 2023-06-12 16:14:34 -07:00
lib 19 hotfixes. 14 are cc:stable and the remainder address issues which were 2023-06-12 16:14:34 -07:00
LICENSES
mm mm/mmap: Fix error path in do_vmi_align_munmap() 2023-06-18 09:32:17 -07:00
net dccp: Print deprecation notice. 2023-06-15 15:08:59 -07:00
rust
samples
scripts
security selinux: don't use make's grouped targets feature yet 2023-06-01 13:56:13 -04:00
sound ASoC: Fixes for v6.4 2023-06-16 09:28:27 +02:00
tools Including fixes from wireless, and netfilter. 2023-06-15 21:11:17 -07:00
usr
virt KVM: Fix vcpu_array[0] races 2023-05-19 13:56:26 -04:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap Linux 6.4-rc7 2023-06-19 16:01:25 +10:00
.rustfmt.toml
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS Merge tag 'drm-msm-next-2023-06-18' of https://gitlab.freedesktop.org/drm/msm into drm-next 2023-06-19 16:01:46 +10:00
Makefile Linux 6.4-rc7 2023-06-18 14:06:27 -07:00
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.

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.