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In case there are DMA channels not paused by consumers in suspend
process (valid on AT91 SoCs for serial driver when no_console_suspend) the
driver pauses them (using at_xdmac_device_pause() which is also the same
function called by dmaengine_pause()) and then in the resume process the
driver resumes them calling at_xdmac_device_resume() which is the same
function called by dmaengine_resume()). This is good for DMA channels
not paused by consumers but for drivers that calls
dmaengine_pause()/dmaegine_resume() on suspend/resume path this may lead to
DMA channel being enabled before the IP is enabled. For IPs that needs
strict ordering with regards to DMA channel enablement this will lead to
wrong behavior. To fix this add a new set of functions
at_xdmac_device_pause_internal()/at_xdmac_device_resume_internal() to be
called only on suspend/resume.
Fixes:
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||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.