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d3e4439a79
commit 285df995f90e3d61d97f327d34b9659d92313314 upstream.
On the GTA04A5 writing a reset command to the gyroscope causes IRQ
storms because NACK IRQs are enabled and therefore triggered but not
acked.
Sending a reset command to the gyroscope by
i2cset 1 0x69 0x14 0xb6
with an additional debug print in the ISR (not the thread) itself
causes
[ 363.353515] i2c i2c-1: ioctl, cmd=0x720, arg=0xbe801b00
[ 363.359039] omap_i2c 48072000.i2c: addr: 0x0069, len: 2, flags: 0x0, stop: 1
[ 363.366180] omap_i2c 48072000.i2c: IRQ LL (ISR = 0x1110)
[ 363.371673] omap_i2c 48072000.i2c: IRQ (ISR = 0x0010)
[ 363.376892] omap_i2c 48072000.i2c: IRQ LL (ISR = 0x0102)
[ 363.382263] omap_i2c 48072000.i2c: IRQ LL (ISR = 0x0102)
[ 363.387664] omap_i2c 48072000.i2c: IRQ LL (ISR = 0x0102)
repeating till infinity
[...]
(0x2 = NACK, 0x100 = Bus free, which is not enabled)
Apparently no other IRQ bit gets set, so this stalls.
Do not ignore enabled interrupts and make sure they are acked.
If the NACK IRQ is not needed, it should simply not enabled, but
according to the above log, caring about it is necessary unless
the Bus free IRQ is enabled and handled. The assumption that is
will always come with a ARDY IRQ, which was the idea behind
ignoring it, proves wrong.
It is true for simple reads from an unused address.
To still avoid the i2cdetect trouble which is the reason for
commit c770657bd261 ("i2c: omap: Fix standard mode false ACK readings"),
avoid doing much about NACK in omap_i2c_xfer_data() which is used
by both IRQ mode and polling mode, so also the false detection fix
is extended to polling usage and IRQ storms are avoided.
By changing this, the hardirq handler is not needed anymore to filter
stuff.
The mentioned gyro reset now just causes a -ETIMEDOUT instead of
hanging the system.
Fixes: c770657bd261 ("i2c: omap: Fix standard mode false ACK readings").
CC: stable@kernel.org
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Aniket Limaye <a-limaye@ti.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20250228140420.379498-1-andreas@kemnade.info
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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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.