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Imre Deak cc018c2626 drm/i915: Avoid endless HPD poll detect loop via runtime suspend/resume 
The issue fixed in

commit a8ddac7c9f ("drm/i915: Avoid HPD poll detect triggering a new detect cycle")

on VLV, CHV is still present on platforms where the display hotplug
detection functionality is available whenever the device is in D0 state
(hence these platforms switch to HPD polling only when the device is
runtime suspended).

The above commit avoids an endless i915_hpd_poll_init_work() ->
connector detect loop by making sure that by the end of
i915_hpd_poll_init_work() all display power references acquired by the
connector detect functions which can trigger a new cycle (display core
power domain) are dropped. However on platforms where HPD polling is
enabled/disabled only from the runtime suspend/resume handlers, this is
not ensured: for instance eDP VDD, TypeC port PHYs and the runtime
autosuspend delay may still keep the device runtime resumed (via a power
reference acquired during connector detection and hence result in an
endless loop like the above).

Solve the problem described in the above commit on all platforms, by
making sure that a i915_hpd_poll_init_work() -> connector detect
sequence can't take any power reference in the first place which would
trigger a new cycle, instead of relying on these power references to be
dropped by the end of the sequence.

With the default runtime autosuspend delay (10 sec) this issue didn't
happen in practice, since the device remained runtime resumed for the
whole duration of the above sequence. CI/IGT tests however set the
autosuspend delay to 0, which makes the problem visible, see References:
below.

Tested on GLK, CHV.

v2: Don't warn about a requeued work, to account for disabling
    polling directly during driver loading, reset and system resume.

References: https://gitlab.freedesktop.org/drm/intel/-/issues/7940#note_1997403
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230809104307.1218058-1-imre.deak@intel.com
2023-08-11 16:08:52 +03:00
arch sh: mach-sh7763rdp: Assign FB_MODE_IS_UNKNOWN to struct fb_videomode.flag 2023-07-24 16:50:38 +02:00
block SCSI fixes on 20230714 2023-07-14 19:57:29 -07:00
certs KEYS: Add missing function documentation 2023-04-24 16:15:52 +03:00
crypto crypto: algif_hash - Fix race between MORE and non-MORE sends 2023-07-08 22:48:42 +10:00
Documentation - Removing unused declarations (Arnd, Gustavo) 2023-08-07 13:47:30 +10:00
drivers drm/i915: Avoid endless HPD poll detect loop via runtime suspend/resume 2023-08-11 16:08:52 +03:00
fs Five smb3 client fixes 2023-07-16 12:49:05 -07:00
include drm/doc: document that PRIME import/export is always supported 2023-08-03 12:29:13 +02:00
init Kbuild updates for v6.5 2023-07-01 09:24:31 -07:00
io_uring io_uring-6.5-2023-07-14 2023-07-14 19:46:54 -07:00
ipc Merge branch 'work.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2023-02-24 19:20:07 -08:00
kernel - Remove a cgroup from under a polling process properly 2023-07-16 13:22:08 -07:00
lib iov_iter: Mark copy_iovec_from_user() noclone 2023-07-10 09:52:28 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: lock newly mapped VMA with corrected ordering 2023-07-08 16:44:11 -07:00
net A fix to prevent a potential buffer overrun in the messenger, marked 2023-07-14 09:05:15 -07:00
rust rust: error: impl Debug for Error with errname() integration 2023-06-13 01:24:42 +02:00
samples vfio-mdev: Remove flag FBINFO_DEFAULT from fbdev sample driver 2023-07-24 16:50:38 +02:00
scripts kallsyms: strip LTO-only suffixes from promoted global functions 2023-07-12 15:39:34 -07:00
security + Bug Fixes 2023-07-07 09:55:31 -07:00
sound sound fixes for 6.5-rc1 2023-07-07 15:40:17 -07:00
tools - Mark copy_iovec_from_user() __noclone in order to prevent gcc from 2023-07-16 13:34:29 -07:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt ARM64: 2023-07-03 15:32:22 -07:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Revert ".gitignore: ignore *.cover and *.mbx" 2023-07-04 15:05:12 -07:00
.mailmap spi: Fixes for v6.5 2023-07-15 08:51:02 -07:00
.rustfmt.toml
COPYING
CREDITS - Address -Wmissing-prototype warnings 2023-06-26 16:43:54 -07:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig
MAINTAINERS drm-misc-next for v6.6: 2023-07-17 15:37:57 +02:00
Makefile Linux 6.5-rc2 2023-07-16 15:10:37 -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.