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c918008fe7Merge series from Dmytro Maluka <dmy@semihalf.com>: This series includes 2 patches related to (but not fixing) the following I2C failure which occurs sometimes during system suspend or resume and indicates a problem with a spurious DA7219 interrupt: [ 355.876211] i2c_designware i2c_designware.3: Transfer while suspended [ 355.876245] WARNING: CPU: 2 PID: 3576 at drivers/i2c/busses/i2c-designware-master.c:570 i2c_dw_xfer+0x411/0x440 ... [ 355.876462] Call Trace: [ 355.876468] <TASK> [ 355.876475] ? update_load_avg+0x1b3/0x615 [ 355.876484] __i2c_transfer+0x101/0x1d8 [ 355.876494] i2c_transfer+0x74/0x10d [ 355.876504] regmap_i2c_read+0x6a/0x9c [ 355.876513] _regmap_raw_read+0x179/0x223 [ 355.876521] regmap_raw_read+0x1e1/0x28e [ 355.876527] regmap_bulk_read+0x17d/0x1ba [ 355.876532] ? __wake_up+0xed/0x1bb [ 355.876542] da7219_aad_irq_thread+0x54/0x2c9 [snd_soc_da7219 5fb8ebb2179cf2fea29af090f3145d68ed8e2184] [ 355.876556] irq_thread+0x13c/0x231 [ 355.876563] ? irq_forced_thread_fn+0x5f/0x5f [ 355.876570] ? irq_thread_fn+0x4d/0x4d [ 355.876576] kthread+0x13a/0x152 [ 355.876581] ? synchronize_irq+0xc3/0xc3 [ 355.876587] ? kthread_blkcg+0x31/0x31 [ 355.876592] ret_from_fork+0x1f/0x30 [ 355.876601] </TASK> This log shows that DA7219 AAD interrupt handler da7219_aad_irq_thread() is unexpectedly running when DA7219 is suspended and should not generate interrupts. As a result, the IRQ handler is trying to read AAD IRQ event status over I2C and is hitting the I2C driver "Transfer while suspended" failure. Patch #1 adds synchronize_irq() when suspending DA7219, to prevent the IRQ handler from running after suspending if there is a pending IRQ generated before suspending. With this patch the above failure is still reproducible, so this patch does not fix any real observed issue so far, but at least is useful for confirming that the above issue is not caused by a pending IRQ but rather looks like a DA7219 hardware issue with an unexpectedly generated IRQ. Patch #2 does not fix the above issue either, but it prevents its potentially harmful side effects. With the existing code, if the issue occurs and the IRQ handler fails to read the AAD IRQ events status over I2C, it does not check that and tries to use the garbage uninitialized value of the events status, potentially reporting bogus events. This patch fixes that by adding missing error checking. In fact I'm sending these patches not only to submit them for review but also to ask Renesas folks for any hints on a possible cause of the described DA7219 issue (AAD interrupts spuriously firing after jack detection is already disabled) or how to debug it further. |
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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.