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Fabio Estevam 7e5d0bf6af ARM: dts: imx6qdl-sabreauto: Fix storm of accelerometer interrupts 
Since commit a211b8c55f ("ARM: dts: imx6qdl-sabreauto: Add sensors")
a storm of accelerometer interrupts is seen:

[  114.211283] irq 260: nobody cared (try booting with the "irqpoll" option)
[  114.218108] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.4 #1
[  114.223960] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[  114.230531] [<c0112858>] (unwind_backtrace) from [<c010cdc8>] (show_stack+0x10/0x14)
[  114.238301] [<c010cdc8>] (show_stack) from [<c0c1aa1c>] (dump_stack+0xd8/0x110)
[  114.245644] [<c0c1aa1c>] (dump_stack) from [<c0193594>] (__report_bad_irq+0x30/0xc0)
[  114.253417] [<c0193594>] (__report_bad_irq) from [<c01933ac>] (note_interrupt+0x108/0x298)
[  114.261707] [<c01933ac>] (note_interrupt) from [<c018ffe4>] (handle_irq_event_percpu+0x70/0x80)
[  114.270433] [<c018ffe4>] (handle_irq_event_percpu) from [<c019002c>] (handle_irq_event+0x38/0x5c)
[  114.279326] [<c019002c>] (handle_irq_event) from [<c019438c>] (handle_level_irq+0xc8/0x154)
[  114.287701] [<c019438c>] (handle_level_irq) from [<c018eda0>] (generic_handle_irq+0x20/0x34)
[  114.296166] [<c018eda0>] (generic_handle_irq) from [<c0534214>] (mxc_gpio_irq_handler+0x30/0xf0)
[  114.304975] [<c0534214>] (mxc_gpio_irq_handler) from [<c0534334>] (mx3_gpio_irq_handler+0x60/0xb0)
[  114.313955] [<c0534334>] (mx3_gpio_irq_handler) from [<c018eda0>] (generic_handle_irq+0x20/0x34)
[  114.322762] [<c018eda0>] (generic_handle_irq) from [<c018f3ac>] (__handle_domain_irq+0x64/0xe0)
[  114.331485] [<c018f3ac>] (__handle_domain_irq) from [<c05215a8>] (gic_handle_irq+0x4c/0xa8)
[  114.339862] [<c05215a8>] (gic_handle_irq) from [<c0101a70>] (__irq_svc+0x70/0x98)
[  114.347361] Exception stack(0xc1301ec0 to 0xc1301f08)
[  114.352435] 1ec0: 00000001 00000006 00000000 c130c340 00000001 c130f688 9785636d c13ea2e8
[  114.360635] 1ee0: 9784907d 0000001a eaf99d78 0000001a 00000000 c1301f10 c0182b00 c0878de4
[  114.368830] 1f00: 20000013 ffffffff
[  114.372349] [<c0101a70>] (__irq_svc) from [<c0878de4>] (cpuidle_enter_state+0x168/0x5f4)
[  114.380464] [<c0878de4>] (cpuidle_enter_state) from [<c08792ac>] (cpuidle_enter+0x28/0x38)
[  114.388751] [<c08792ac>] (cpuidle_enter) from [<c015ef9c>] (do_idle+0x224/0x2a8)
[  114.396168] [<c015ef9c>] (do_idle) from [<c015f3b8>] (cpu_startup_entry+0x18/0x20)
[  114.403765] [<c015f3b8>] (cpu_startup_entry) from [<c1200e54>] (start_kernel+0x43c/0x500)
[  114.411958] handlers:
[  114.414302] [<a01028b8>] irq_default_primary_handler threaded [<fd7a3b08>] mma8452_interrupt
[  114.422974] Disabling IRQ #260

           CPU0       CPU1
....
260:     100001          0  gpio-mxc  31 Level     mma8451

The MMA8451 interrupt triggers as low level, so the GPIO6_IO31 pin
needs to activate its pull up, otherwise it will stay always at low level
generating multiple interrupts.

The current device tree does not configure the IOMUX for this pin, so
it uses whathever comes configured from the bootloader.

The IOMUXC_SW_PAD_CTL_PAD_EIM_BCLK register value comes as 0x8000 from
the bootloader, which has PKE bit cleared, hence disabling the
pull-up.

Instead of relying on a previous configuration from the bootloader,
configure the GPIO6_IO31 pin with pull-up enabled in order to fix
this problem.

Fixes: a211b8c55f ("ARM: dts: imx6qdl-sabreauto: Add sensors")
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-By: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
 		2019-10-26 16:07:03 +08:00
Documentation Documentation/process update for 5.4-rc1 2019-09-29 19:52:52 -07:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
arch ARM: dts: imx6qdl-sabreauto: Fix storm of accelerometer interrupts 2019-10-26 16:07:03 +08:00
block block: fix null pointer dereference in blk_mq_rq_timed_out() 2019-09-27 07:01:25 -06:00
certs PKCS#7: Refactor verify_pkcs7_signature() 2019-08-05 18:40:18 -04:00
crypto Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2019-09-28 08:14:15 -07:00
drivers soc: imx: imx-scu: Getting UID from SCU should have response 2019-10-06 09:21:38 +08:00
fs for-5.4-rc1-tag 2019-09-30 10:25:24 -07:00
include A few more tracing fixes: 2019-09-30 09:29:53 -07:00
init Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2019-09-28 08:14:15 -07:00
ipc ipc/sem.c: convert to use built-in RCU list checking 2019-09-25 17:51:41 -07:00
kernel A few more tracing fixes: 2019-09-30 09:29:53 -07:00
lib Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-09-28 17:47:33 -07:00
mm Merge branch 'hugepage-fallbacks' (hugepatch patches from David Rientjes) 2019-09-28 14:26:47 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-09-28 17:47:33 -07:00
samples rpmsg updates for v5.4 2019-09-22 10:58:15 -07:00
scripts Merge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity 2019-09-27 19:37:27 -07:00
security Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2019-09-28 08:14:15 -07:00
sound sound fixes for 5.4-rc1 2019-09-24 16:46:16 -07:00
tools A few more tracing fixes: 2019-09-30 09:29:53 -07:00
usr Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-09-28 17:47:33 -07:00
virt * s390: ioctl hardening, selftests 2019-09-18 09:49:13 -07:00
.clang-format clang-format: Update with the latest for_each macro list 2019-08-31 10:00:51 +02:00
.cocciconfig
…
.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 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2019-09-18 12:34:53 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS CREDITS: Update email address 2019-09-13 17:21:38 +03:00
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 ARM SCMI fixes for v5.4 2019-09-29 11:20:41 -07:00
Makefile Linux 5.4-rc1 2019-09-30 10:35:40 -07:00
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.