linux_dsm_epyc7002

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Ulf Hansson a23318feef i2c: designware: Fix system suspend The commit `8503ff1665` ("i2c: designware: Avoid unnecessary resuming during system suspend"), may suggest to the PM core to try out the so called direct_complete path for system sleep. In this path, the PM core treats a runtime suspended device as it's already in a proper low power state for system sleep, which makes it skip calling the system sleep callbacks for the device, except for the ->prepare() and the ->complete() callbacks. However, the PM core may unset the direct_complete flag for a parent device, in case its child device are being system suspended before. In this scenario, the PM core invokes the system sleep callbacks, no matter if the device is runtime suspended or not. Particularly in cases of an existing i2c slave device, the above path is triggered, which breaks the assumption that the i2c device is always runtime resumed whenever the dw_i2c_plat_suspend() is being called. More precisely, dw_i2c_plat_suspend() calls clk_core_disable() and clk_core_unprepare(), for an already disabled/unprepared clock, leading to a splat in the log about clocks calls being wrongly balanced and breaking system sleep. To still allow the direct_complete path in cases when it's possible, but also to keep the fix simple, let's runtime resume the i2c device in the ->suspend() callback, before continuing to put the device into low power state. Note, in cases when the i2c device is attached to the ACPI PM domain, this problem doesn't occur, because ACPI's ->suspend() callback, assigned to acpi_subsys_suspend(), already calls pm_runtime_resume() for the device. It should also be noted that this change does not fix commit `8503ff1665` ("i2c: designware: Avoid unnecessary resuming during system suspend"). Because for the non-ACPI case, the system sleep support was already broken prior that point. Cc: <stable@vger.kernel.org> # v4.4+ Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: John Stultz <john.stultz@linaro.org> Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>		2017-08-14 21:02:42 +02:00
arch	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2017-08-13 15:34:28 -07:00
block	block: Make blk_mq_delay_kick_requeue_list() rerun the queue at a quiet time	2017-08-09 20:24:38 -06:00
certs	modsign: add markers to endif-statements in certs/Makefile	2017-07-14 11:01:37 +10:00
crypto	crypto: authencesn - Fix digest_null crash	2017-07-18 17:01:11 +08:00
Documentation	fbdev fixes for v4.13-rc5:	2017-08-11 11:44:18 -07:00
drivers	i2c: designware: Fix system suspend	2017-08-14 21:02:42 +02:00
firmware	firmware/Makefile: force recompilation if makefile changes	2017-05-08 17:15:10 -07:00
fs	Some more NFS client bugfixes for 4.13	2017-08-11 13:54:09 -07:00
include	tty/serial fixes for 4.13-rc5	2017-08-13 12:33:35 -07:00
init	random: do not ignore early device randomness	2017-07-12 16:26:00 -07:00
ipc	ipc: add missing container_of()s for randstruct	2017-08-02 17:16:12 -07:00
kernel	mm: migrate: prevent racy access to tlb_flush_pending	2017-08-10 15:54:07 -07:00
lib	fault-inject: fix wrong should_fail() decision in task context	2017-08-10 15:54:06 -07:00
mm	rmap: do not call mmu_notifier_invalidate_page() under ptl	2017-08-10 15:54:07 -07:00
net	packet: fix tp_reserve race in packet_set_ring	2017-08-10 09:52:12 -07:00
samples	samples/bpf: fix bpf tunnel cleanup	2017-07-31 22:02:47 -07:00
scripts	parse-maintainers: Move matching sections from MAINTAINERS	2017-08-08 11:16:14 -07:00
security	Now that IPC and other changes have landed, enable manual markings for	2017-07-19 08:55:18 -07:00
sound	ASoC: Fixes for v4.13	2017-08-02 17:11:45 +02:00
tools	bpf: fix selftest/bpf/test_pkt_md_access on s390x	2017-08-07 10:06:27 -07:00
usr	ramfs: clarify help text that compression applies to ramfs as well as legacy ramdisk.	2017-07-06 16:24:30 -07:00
virt	KVM/ARM Fixes for v4.13-rc4	2017-08-03 17:59:58 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Add hch to .get_maintainer.ignore	2015-08-21 14:30:10 -07:00
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	kbuild: Add support to generate LLVM assembly files	2017-04-25 08:13:52 +09:00
.mailmap	power supply and reset changes for the v4.12 series (part 2)	2017-05-12 12:02:21 -07:00
COPYING
CREDITS	avr32: remove support for AVR32 architecture	2017-05-01 09:27:15 +02:00
Kbuild	kbuild: Consolidate header generation from ASM offset information	2017-04-13 05:43:37 +09:00
Kconfig	kbuild: migrate all arch to the kconfig mainmenu upgrade	2010-09-19 22:54:11 -04:00
MAINTAINERS	MAINTAINERS: copy virtio on balloon_compaction.c	2017-08-10 15:54:07 -07:00
Makefile	Linux 4.13-rc5	2017-08-13 16:01:32 -07:00
README	README: add a new README file, pointing to the Documentation/	2016-10-24 08:12:35 -02:00

README

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

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.