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The igb_ptp_feature_enable_82580 function correctly checks that unknown
flags are not passed to the function. However, it does not actually check
PTP_RISING_EDGE or PTP_FALLING_EDGE when configuring the external timestamp
function.
The data sheet for the 82580 product says:
Upon a change in the input level of one of the SDP pins that was
configured to detect Time stamp events using the TSSDP register, a time
stamp of the system time is captured into one of the two auxiliary time
stamp registers (AUXSTMPL/H0 or AUXSTMPL/H1).
For example to define timestamping of events in the AUXSTMPL0 and
AUXSTMPH0 registers, Software should:
1. Set the TSSDP.AUX0_SDP_SEL field to select the SDP pin that detects
the level change and set the TSSDP.AUX0_TS_SDP_EN bit to 1.
2. Set the TSAUXC.EN_TS0 bit to 1 to enable timestamping
The same paragraph is in the i350 and i354 data sheets.
The wording implies that the time stamps are captured at any level change.
There does not appear to be any way to only timestamp one edge of the
signal.
Reject requests which do not set both PTP_RISING_EDGE and PTP_FALLING_EDGE
when operating under PTP_STRICT_FLAGS mode via PTP_EXTTS_REQUEST2.
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 | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .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 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.