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Controller driver probes first, enables link training and scans the bus. When the PCI bridge is found, its child DT nodes will be scanned and pwrctrl devices will be created if needed. By the time pwrctrl driver probe gets called, link training is already enabled by controller driver. Certain devices like TC9563, which uses the PCI pwrctl framework, need to configure the device before the PCIe link is up. As the controller driver already enables link training as part of its probe, the moment device is powered on, controller and device participate in link training and link can come up immediately and may not have time to configure the device. So we need to stop the link training by using assert_perst() by asserting PERST# and de-asserting PERST# after device is configured. Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Manivannan Sadhasivam <mani@kernel.org> Link: https://patch.msgid.link/20251101-tc9563-v9-2-de3429f7787a@oss.qualcomm.com |
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| certs | ||
| crypto | ||
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| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
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| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .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 reStructuredText 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.