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Ville Syrjälä 02cfae7d62 drm/i915/psr: Only allow PSR in LPSP mode on HSW non-ULT [ Upstream commit `f9f031dd21` ] On HSW non-ULT (or at least on Dell Latitude E6540) external displays start to flicker when we enable PSR on the eDP. We observe a much higher SR and PC6 residency than should be possible with an external display, and indeen much higher than what we observe with eDP disabled and only the external display enabled. Looks like the hardware is somehow ignoring the fact that the external display is active during PSR. I wasn't able to redproduce this on my HSW ULT machine, or BDW. So either there's something specific about this particular laptop (eg. some unknown firmware thing) or the issue is limited to just non-ULT HSW systems. All known registers that could affect this look perfectly reasonable on the affected machine. As a workaround let's unmask the LPSP event to prevent PSR entry except while in LPSP mode (only pipe A + eDP active). This will prevent PSR entry entirely when multiple pipes are active. The one slight downside is that we now also prevent PSR entry when driving eDP with pipe B or C, but I think that's a reasonable tradeoff to avoid having to implement a more complex workaround. Cc: stable@vger.kernel.org Fixes: `783d8b8087` ("drm/i915/psr: Re-enable PSR1 on hsw/bdw") Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/10092 Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240118212131.31868-1-ville.syrjala@linux.intel.com Reviewed-by: Jouni Högander <jouni.hogander@intel.com> (cherry picked from commit `94501c3ca6`) Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-01-31 16:19:11 -08:00
arch	LoongArch/smp: Call rcutree_report_cpu_starting() earlier	2024-01-31 16:18:57 -08:00
block	block: ensure we hold a queue reference when using queue limits	2024-01-25 15:35:57 -08:00
certs	certs: Reference revocation list for all keyrings	2023-08-17 20:12:41 +00:00
crypto	crypto: api - Disallow identical driver names	2024-01-31 16:18:49 -08:00
Documentation	drm: Allow drivers to indicate the damage helpers to ignore damage clips	2024-01-31 16:19:08 -08:00
drivers	drm/i915/psr: Only allow PSR in LPSP mode on HSW non-ULT	2024-01-31 16:19:11 -08:00
fs	btrfs: zoned: optimize hint byte for zoned allocator	2024-01-31 16:19:10 -08:00
include	serial: core: Provide port lock wrappers	2024-01-31 16:19:10 -08:00
init	rootfs: Fix support for rootfstype= when root= is given	2024-01-25 15:35:46 -08:00
io_uring	io_uring: adjust defer tw counting	2024-01-25 15:36:00 -08:00
ipc	Add x86 shadow stack support	2023-08-31 12:20:12 -07:00
kernel	bpf: Add bpf_sock_addr_set_sun_path() to allow writing unix sockaddr from bpf	2024-01-31 16:19:04 -08:00
lib	crypto: lib/mpi - Fix unexpected pointer access in mpi_ec_init	2024-01-31 16:18:49 -08:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	mm: migrate: fix getting incorrect page mapping during page migration	2024-01-31 16:19:10 -08:00
net	net/bpf: Avoid unused "sin_addr_len" warning when CONFIG_CGROUP_BPF is not set	2024-01-31 16:19:09 -08:00
rust	rust: Ignore preserve-most functions	2024-01-25 15:35:41 -08:00
samples	vfio/mtty: Overhaul mtty interrupt handling	2024-01-10 17:16:55 +01:00
scripts	scripts/get_abi: fix source path leak	2024-01-31 16:18:55 -08:00
security	lsm: new security_file_ioctl_compat() hook	2024-01-31 16:18:54 -08:00
sound	soundwire: fix initializing sysfs for same devices on different buses	2024-01-31 16:18:47 -08:00
tools	selftests: bonding: do not test arp/ns target with mode balance-alb/tlb	2024-01-31 16:19:05 -08:00
usr	initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP	2023-06-06 17:54:49 +09:00
virt	ARM:	2023-09-07 13:52:20 -07:00
.clang-format	iommu: Add for_each_group_device()	2023-05-23 08:15:51 +02:00
.cocciconfig
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	kbuild: rpm-pkg: rename binkernel.spec to kernel.spec	2023-07-25 00:59:33 +09:00
.mailmap	20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues	2023-10-24 09:52:16 -10:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING
CREDITS	USB: Remove Wireless USB and UWB documentation	2023-08-09 14:17:32 +02:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	Char/Misc driver fixes for 6.6-final	2023-10-28 07:51:27 -10:00
Makefile	Linux 6.6.14	2024-01-25 15:36:01 -08:00
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.