fef2263688
Commit [1] enabled the possibility of checking the DVST (Device State Transition) bit of INTSTS0 (Interrupt Status Register 0) and calling the irq_dev_state() handler if the DVST bit is set. But neither commit [1] nor commit [2] actually enabled the DVSE (Device State Transition Interrupt Enable) bit in the INTENB0 (Interrupt Enable Register 0). As a consequence, irq_dev_state() handler is getting called as a side effect of other (non-DVSE) interrupts being fired, which definitely can't be relied upon, if DVST notifications are of any value. Why this doesn't hurt is because usbhsg_irq_dev_state() currently doesn't do much except of a dev_dbg(). Once more work is added to the handler (e.g. detecting device "Suspended" state and notifying other USB gadget components about it), enabling DVSE becomes a hard requirement. Do it in a standalone commit for better visibility and clear explanation. [1] commit |
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| fs | ||
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| kernel | ||
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| README | ||
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.