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Suman Anna cf911ee9f4 ARM: OMAP2+: use separate IOMMU pdata to fix DRA7 IPU1 boot 
[ Upstream commit 4601832f40 ]

The IPU1 MMU has been using common IOMMU pdata quirks defined and
used by all IPU IOMMU devices on OMAP4 and beyond. Separate out the
pdata for IPU1 MMU with the additional .set_pwrdm_constraint ops
plugged in, so that the IPU1 power domain can be restricted to ON
state during the boot and active period of the IPU1 remote processor.
This eliminates the pre-conditions for the IPU1 boot issue as
described in commit afe518400bdb ("iommu/omap: fix boot issue on
remoteprocs with AMMU/Unicache").

NOTE:
1. RET is not a valid target power domain state on DRA7 platforms,
   and IPU power domain is normally programmed for OFF. The IPU1
   still fails to boot though, and an unclearable l3_noc error is
   thrown currently on 4.14 kernel without this fix. This behavior
   is slightly different from previous 4.9 LTS kernel.
2. The fix is currently applied only to IPU1 on DRA7xx SoC, as the
   other affected processors on OMAP4/OMAP5/DRA7 are in domains
   that are not entering RET. IPU2 on DRA7 is in CORE power domain
   which is only programmed for ON power state. The fix can be easily
   scaled if these domains do hit RET in the future.
3. The issue was not seen on current DRA7 platforms if any of the
   DSP remote processors were booted and using one of the GPTimers
   5, 6, 7 or 8 on previous 4.9 LTS kernel. This was due to the
   errata fix for i874 implemented in commit 1cbabcb980 ("ARM:
   DRA7: clockdomain: Implement timer workaround for errata i874")
   which keeps the IPU1 power domain from entering RET when the
   timers are active. But the timer workaround did not make any
   difference on 4.14 kernel, and an l3_noc error was seen still
   without this fix.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2020-07-22 09:32:56 +02:00
Documentation dt-bindings: mailbox: zynqmp_ipi: fix unit address 2020-07-22 09:32:52 +02:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
arch ARM: OMAP2+: use separate IOMMU pdata to fix DRA7 IPU1 boot 2020-07-22 09:32:56 +02:00
block blk-mq-debugfs: update blk_queue_flag_name[] accordingly for new flags 2020-07-22 09:32:52 +02:00
certs PKCS#7: Refactor verify_pkcs7_signature() 2019-08-05 18:40:18 -04:00
crypto crypto: af_alg - fix use-after-free in af_alg_accept() due to bh_lock_sock() 2020-07-09 09:37:52 +02:00
drivers net: sfp: add some quirks for GPON modules 2020-07-22 09:32:56 +02:00
fs gfs2: read-only mounts should grab the sd_freeze_gl glock 2020-07-22 09:32:53 +02:00
include blk-mq-debugfs: update blk_queue_flag_name[] accordingly for new flags 2020-07-22 09:32:52 +02:00
init x86: Fix early boot crash on gcc-10, third try 2020-05-20 08:20:34 +02:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:20:16 +02:00
kernel cgroup: fix cgroup_sk_alloc() for sk_clone_lock() 2020-07-22 09:32:49 +02:00
lib test_objagg: Fix potential memory leak in error handling 2020-06-30 15:37:04 -04:00
mm mm, compaction: make capture control handling safe wrt interrupts 2020-07-09 09:37:57 +02:00
net ip: Fix SO_MARK in RST, ACK and ICMP packets 2020-07-22 09:32:50 +02:00
samples samples/vfs: avoid warning in statx override 2020-07-09 09:37:54 +02:00
scripts recordmcount: support >64k sections 2020-06-30 15:37:05 -04:00
security selinux: fix double free 2020-06-24 17:50:48 +02:00
sound ALSA: hda/realtek: Enable headset mic of Acer Veriton N4660G with ALC269VC 2020-07-16 08:16:43 +02:00
tools ipv6: fib6_select_path can not use out path for nexthop objects 2020-07-22 09:32:47 +02:00
usr initramfs: restore default compression behavior 2020-04-08 09:08:38 +02:00
virt KVM: arm64: Save the host's PtrAuth keys in non-preemptible context 2020-06-17 16:40:38 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2019-08-31 10:00:51 +02:00
.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: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Modules updates for v5.4 2019-09-22 10:34:46 -07:00
.mailmap ARM: SoC fixes 2019-11-10 13:41:59 -08:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS MAINTAINERS: Remove Simon as Renesas SoC Co-Maintainer 2019-10-10 08:12:51 -07:00
Kbuild kbuild: do not descend to ./Kbuild when cleaning 2019-08-21 21:03:58 +09:00
Kconfig docs: kbuild: convert docs to ReST and rename to *.rst 2019-06-14 14:21:21 -06:00
MAINTAINERS MAINTAINERS: Update drm/i915 bug filing URL 2020-02-28 17:22:19 +01:00
Makefile Linux 5.4.52 2020-07-16 08:16:48 +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.