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Maxime Ripard cc5f1cbbc1
drm/vc4: hdmi: Remove the DDC probing for status detection 
Commit 9d44abbbb8 ("drm/vc4: Fall back to using an EDID probe in the
absence of a GPIO.") added some code to read the EDID through DDC in the
HDMI driver detect hook since the Pi3 had no HPD GPIO back then.
However, commit b1b8f45b31 ("ARM: dts: bcm2837: Add missing GPIOs of
Expander") changed that a couple of years later.

This causes an issue though since some TV (like the LG 55C8) when it
comes out of standy will deassert the HPD line, but the EDID will
remain readable.

It causes an issues nn platforms without an HPD GPIO, like the Pi4,
where the DDC probing will be our primary mean to detect a display, and
thus we will never detect the HPD pulse. This was fine before since the
pulse was small enough that we would never detect it, and we also didn't
have anything (like the scrambler) that needed to be set up in the
display.

However, now that we have both, the display during the HPD pulse will
clear its scrambler status, and since we won't detect the
disconnect/reconnect cycle we will never enable the scrambler back.

As our main reason for that DDC probing is gone, let's just remove it.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://lore.kernel.org/r/20211025152903.1088803-2-maxime@cerno.tech
2021-11-04 10:35:32 +01:00
arch x86/MCE/AMD: Export smca_get_bank_type symbol 2021-10-06 15:53:24 -04:00
block blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd 2021-09-15 12:03:18 -06:00
certs certs: Add support for using elliptic curve keys for signing modules 2021-08-23 19:55:42 +03:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2021-08-30 12:57:10 -07:00
Documentation dt-bindings: ili9881c: add rotation property 2021-10-25 18:43:39 +02:00
drivers drm/vc4: hdmi: Remove the DDC probing for status detection 2021-11-04 10:35:32 +01:00
fs iov_iter.3-5.15-2021-09-17 2021-09-17 09:23:44 -07:00
include drm/probe-helper: add drm_kms_helper_connector_hotplug_event 2021-11-02 14:27:10 +01:00
init memblock: introduce saner 'memblock_free_ptr()' interface 2021-09-14 13:23:22 -07:00
ipc ipc: remove memcg accounting for sops objects in do_semtimedop() 2021-09-14 10:22:11 -07:00
kernel Merge tag 'drm-intel-gt-next-2021-10-08' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2021-10-11 18:09:39 +10:00
lib Merge tag 'drm-intel-gt-next-2021-10-08' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 2021-10-11 18:09:39 +10:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm drm-misc-next for $kernel-version: 2021-09-22 15:30:40 +10:00
net Networking fixes for 5.15-rc2, including fixes from bpf. 2021-09-16 13:05:42 -07:00
samples kgdb patches for 5.15 2021-09-07 12:08:04 -07:00
scripts Kbuild fixes for v5.15 2021-09-19 12:55:12 -07:00
security Kbuild updates for v5.15 2021-09-03 15:33:47 -07:00
sound sound fixes for 5.15-rc1 2021-09-09 16:05:10 -07:00
tools powerpc fixes for 5.15 #2 2021-09-19 13:00:23 -07:00
usr .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
virt KVM: Drop unused kvm_dirty_gfn_invalid() 2021-09-06 08:23:46 -04:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: update email address of Matthias Fuchs and Thomas Körper 2021-08-19 09:39:44 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: move Murali Karicheri to credits 2021-04-29 15:47:30 -07:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: add reviewers for virtio-gpu 2021-10-29 08:26:23 +02:00
Makefile Linux 5.15-rc2 2021-09-19 17:28:22 -07:00
README

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.