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Some SoC/IP as STM32F469, the snpsid can only be read after clock is enabled, otherwise it will read as 0, and the dwc2_check_core_endianness will assume the core and AHB have opposite endianness, leading to the following error: [ 1.976339] dwc2 50000000.usb: 50000000.usb supply vusb_d not found, using dummy regulator [ 1.986124] dwc2 50000000.usb: Linked as a consumer to regulator.0 [ 1.992711] dwc2 50000000.usb: 50000000.usb supply vusb_a not found, using dummy regulator [ 2.003672] dwc2 50000000.usb: dwc2_core_reset: HANG! AHB Idle timeout GRSTCTL GRSTCTL_AHBIDLE [ 2.015176] dwc2: probe of 50000000.usb failed with error -16 The proposed patch changes the location where dwc2_check_core_endianness is called, allowing the clock peripheral to be enabled first. Acked-by: Minas Harutyunyan <hminas@synopsys.com> Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Signed-off-by: Bruno Meirelles Herrera <bmh@certi.org.br> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.