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Christian Eggers 538a5e208e mtd: rawnand: gpmi: Add ERR007117 protection for nfc_apply_timings 
commit f53d4c109a upstream.

gpmi_io clock needs to be gated off when changing the parent/dividers of
enfc_clk_root (i.MX6Q/i.MX6UL) respectively qspi2_clk_root (i.MX6SX).
Otherwise this rate change can lead to an unresponsive GPMI core which
results in DMA timeouts and failed driver probe:

[    4.072318] gpmi-nand 112000.gpmi-nand: DMA timeout, last DMA
...
[    4.370355] gpmi-nand 112000.gpmi-nand: Chip: 0, Error -110
...
[    4.375988] gpmi-nand 112000.gpmi-nand: Chip: 0, Error -22
[    4.381524] gpmi-nand 112000.gpmi-nand: Error in ECC-based read: -22
[    4.387988] gpmi-nand 112000.gpmi-nand: Chip: 0, Error -22
[    4.393535] gpmi-nand 112000.gpmi-nand: Chip: 0, Error -22
...

Other than stated in i.MX 6 erratum ERR007117, it should be sufficient
to gate only gpmi_io because all other bch/nand clocks are derived from
different clock roots.

The i.MX6 reference manuals state that changing clock muxers can cause
glitches but are silent about changing dividers. But tests showed that
these glitches can definitely happen on i.MX6ULL. For i.MX7D/8MM in turn,
the manual guarantees that no glitches can happen when changing
dividers.

Co-developed-by: Stefan Riedmueller <s.riedmueller@phytec.de>
Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de>
Signed-off-by: Christian Eggers <ceggers@arri.de>
Cc: stable@vger.kernel.org
Acked-by: Han Xu <han.xu@nxp.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20211102202022.15551-2-ceggers@arri.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-01-27 10:53:41 +01:00
arch KVM: VMX: switch blocked_vcpu_on_cpu_lock to raw spinlock 2022-01-27 10:53:40 +01:00
block iocost: Fix divide-by-zero on donation from low hweight cgroup 2021-12-22 09:30:57 +01:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-15 09:50:29 +02:00
crypto crypto: pcrypt - Delay write to padata->info 2021-11-18 14:04:12 +01:00
Documentation bpf: Add kconfig knob for disabling unpriv bpf by default 2022-01-05 12:40:34 +01:00
drivers mtd: rawnand: gpmi: Add ERR007117 protection for nfc_apply_timings 2022-01-27 10:53:41 +01:00
fs f2fs: fix to do sanity check in is_alive() 2022-01-27 10:53:41 +01:00
include perf: Protect perf_guest_cbs with RCU 2022-01-20 09:17:50 +01:00
init bpf: Add kconfig knob for disabling unpriv bpf by default 2022-01-05 12:40:34 +01:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-12-01 09:19:10 +01:00
kernel perf: Protect perf_guest_cbs with RCU 2022-01-20 09:17:50 +01:00
lib siphash: use _unaligned version by default 2021-12-08 09:03:23 +01:00
LICENSES LICENSES/deprecated: add Zlib license text 2020-09-16 14:33:49 +02:00
mm mm: mempolicy: fix THP allocations escaping mempolicy restrictions 2021-12-29 12:26:06 +01:00
net nfc: llcp: fix NULL error pointer dereference on sendmsg() after failed bind() 2022-01-27 10:53:41 +01:00
samples ftrace/samples: Add missing prototypes direct functions 2022-01-11 15:25:00 +01:00
scripts recordmcount.pl: fix typo in s390 mcount regex 2022-01-05 12:40:29 +01:00
security selinux: initialize proto variable in selinux_ip_postroute_compat() 2022-01-05 12:40:30 +01:00
sound ALSA: hda/realtek: Re-order quirk entries for Lenovo 2022-01-20 09:17:51 +01:00
tools selftests: x86: fix [-Wstringop-overread] warn in test_process_vm_readv() 2022-01-11 15:24:58 +01:00
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: downgrade two BUG_ONs to WARN_ON_ONCE 2021-12-22 09:30:50 +01:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.cocciconfig
.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 kbuild: generate Module.symvers only when vmlinux exists 2021-05-19 10:12:59 +02:00
.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: adjust GCC PLUGINS after gcc-plugin.sh removal 2021-12-14 11:32:46 +01:00
Makefile Linux 5.10.93 2022-01-20 09:17:52 +01:00
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.