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Pali Rohár ce4b8f58b6 cpufreq: armada-37xx: Fix the AVS value for load L1 [ Upstream commit `d118ac2062` ] The original CPU voltage value for load L1 is too low for Armada 37xx SoC when base CPU frequency is 1000 or 1200 MHz. It leads to instabilities where CPU gets stuck soon after dynamic voltage scaling from load L1 to L0. Update the CPU voltage value for load L1 accordingly when base frequency is 1000 or 1200 MHz. The minimal L1 value for base CPU frequency 1000 MHz is updated from the original 1.05V to 1.108V and for 1200 MHz is updated to 1.155V. This minimal L1 value is used only in the case when it is lower than value for L0. This change fixes CPU instability issues on 1 GHz and 1.2 GHz variants of Espressobin and 1 GHz Turris Mox. Marvell previously for 1 GHz variant of Espressobin provided a patch [1] suitable only for their Marvell Linux kernel 4.4 fork which workarounded this issue. Patch forced CPU voltage value to 1.108V in all loads. But such change does not fix CPU instability issues on 1.2 GHz variants of Armada 3720 SoC. During testing we come to the conclusion that using 1.108V as minimal value for L1 load makes 1 GHz variants of Espressobin and Turris Mox boards stable. And similarly 1.155V for 1.2 GHz variant of Espressobin. These two values 1.108V and 1.155V are documented in Armada 3700 Hardware Specifications as typical initial CPU voltage values. Discussion about this issue is also at the Armbian forum [2]. [1] - `dc33b62c90` [2] - https://forum.armbian.com/topic/10429-how-to-make-espressobin-v7-stable/ Signed-off-by: Pali Rohár <pali@kernel.org> Acked-by: Gregory CLEMENT <gregory.clement@bootlin.com> Tested-by: Tomasz Maciej Nowak <tmn505@gmail.com> Tested-by: Anders Trier Olesen <anders.trier.olesen@gmail.com> Tested-by: Philip Soares <philips@netisense.com> Fixes: `1c3528232f` ("cpufreq: armada-37xx: Add AVS support") Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2021-05-14 09:50:17 +02:00
arch	m68k: mvme147,mvme16x: Don't wipe PCC timer config bits	2021-05-14 09:50:14 +02:00
block	block: return -EBUSY when there are open partitions in blkdev_reread_part	2021-04-28 13:39:59 +02:00
certs	certs: Fix blacklist flag type confusion	2021-03-04 11:37:59 +01:00
crypto	async_xor: increase src_offs when dropping destination page	2021-05-14 09:49:59 +02:00
Documentation	dt-bindings: serial: stm32: Use 'type: object' instead of false for 'additionalProperties'	2021-05-14 09:50:12 +02:00
drivers	cpufreq: armada-37xx: Fix the AVS value for load L1	2021-05-14 09:50:17 +02:00
fs	NFSv4.2: fix copy stateid copying for the async copy	2021-05-14 09:50:13 +02:00
include	PM: runtime: Replace inline function pm_runtime_callbacks_present()	2021-05-14 09:50:16 +02:00
init	init/Kconfig: make COMPILE_TEST depend on HAS_IOMEM	2021-04-10 13:36:11 +02:00
ipc	ipc: adjust proc_ipc_sem_dointvec definition to match prototype	2020-09-05 12:14:29 -07:00
kernel	tracing: Restructure trace_clock_global() to never block	2021-05-11 14:47:40 +02:00
lib	crypto: poly1305 - fix poly1305_core_setkey() declaration	2021-05-14 09:50:13 +02:00
LICENSES	LICENSES/deprecated: add Zlib license text	2020-09-16 14:33:49 +02:00
mm	mm: ptdump: fix build failure	2021-04-21 13:00:57 +02:00
net	cfg80211: scan: drop entry from hidden_list on overflow	2021-05-14 09:50:00 +02:00
samples	samples, bpf: Add missing munmap in xdpsock	2021-03-17 17:06:12 +01:00
scripts	kasan: fix hwasan build for gcc	2021-04-28 13:40:02 +02:00
security	selinux: add proper NULL termination to the secclass_map permissions	2021-05-14 09:49:59 +02:00
sound	ALSA: hda/realtek: Fix speaker amp on HP Envy AiO 32	2021-05-14 09:50:03 +02:00
tools	Revert "tools/power turbostat: adjust for temperature offset"	2021-05-14 09:50:05 +02:00
usr	Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-08-07 13:29:39 -07:00
virt	KVM: Stop looking for coalesced MMIO zones if the bus is destroyed	2021-05-14 09:50:04 +02:00
.clang-format	RDMA 5.10 pull request	2020-10-17 11:18:18 -07:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.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: docs: ignore sphinx_*/ directories	2020-09-10 10:44:31 -06:00
.mailmap	mailmap: add two more addresses of Uwe Kleine-König	2020-12-06 10:19:07 -08:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Jason Cooper to CREDITS	2020-11-30 10:20:34 +01:00
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: move the staging subsystem to lists.linux.dev	2021-03-25 09:04:18 +01:00
Makefile	Linux 5.10.36	2021-05-11 14:47:41 +02:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

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.