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Chintan Vankar says: ==================== Enable RX HW timestamp for PTP packets using CPTS FIFO The CPSW offers two mechanisms for communicating packet ingress timestamp information to the host. The first mechanism is via the CPTS Event FIFO which records timestamp when triggered by certain events. One such event is the reception of an Ethernet packet with a specified EtherType field. This is used to capture ingress timestamps for PTP packets. With this mechanism the host must read the timestamp (from the CPTS FIFO) separately from the packet payload which is delivered via DMA. In the second mechanism of timestamping, CPSW driver enables hardware timestamping for all received packets by setting the TSTAMP_EN bit in CPTS_CONTROL register, which directs the CPTS module to timestamp all received packets, followed by passing timestamp via DMA descriptors. This mechanism is responsible for triggering errata i2401: "CPSW: Host Timestamps Cause CPSW Port to Lock up." The errata affects all K3 SoCs. Link to errata for AM64x: https://www.ti.com/lit/er/sprz457h/sprz457h.pdf As a workaround we can use first mechanism to timestamp received packets. ==================== Link: https://lore.kernel.org/r/20240419082626.57225-1-c-vankar@ti.com Signed-off-by: Paolo Abeni <pabeni@redhat.com> |
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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.