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606e5d4081
Currently devres managed removal of the spi_controller happens after removing the power domain of the host platform_device.While this does not affect the clean removal of the controller, but affects graceful removal of the child devices if the child device removal requires issuing commands over SPI. Eg. flash device being soft reset to 1S-1S-1S mode before removal so that on next probe operations in 1S-1S-1S mode is successful. Failure is seen when `rmmod spi-cadence-quadspi` is performed: root@j7-evm:~# rmmod spi_cadence_quadspi [ 49.230996] cadence-qspi 47050000.spi: QSPI is still busy after 500ms timeout. [ 49.238209] spi-nor spi1.0: operation failed with -110 [ 49.244457] spi-nor spi1.0: Software reset failed: -110 and on subsequent modprobe the OSPI flash probe fails as it is in 8D-8D-8D mode since the previous soft reset did not happen. root@j7-evm:~# modprobe spi_cadence_quadspi [ 73.253536] spi-nor spi0.0: unrecognized JEDEC id bytes: ff ff ff ff ff ff [ 73.260476] spi-nor: probe of spi0.0 failed with error -2 This commit adds necessary changes to perform spi_unregister_master() in the host device remove() so that the child devices are gracefully removed before the power domain is removed. changes tested on J721E with mt35xu512aba flash. Signed-off-by: Vaishnav Achath <vaishnav.a@ti.com> Link: https://lore.kernel.org/r/20220511115516.14894-1-vaishnav.a@ti.com Signed-off-by: Mark Brown <broonie@kernel.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.