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The GEM MAC has hardware LPI registers (NCR bit 19: TXLPIEN) but no built-in idle timer, so asserting TXLPIEN blocks all TX immediately with no automatic wake. A software idle timer is required, as noted in Microchip documentation (section 40.6.19): "It is best to use firmware to control LPI." Implement phylink managed EEE using the mac_enable_tx_lpi and mac_disable_tx_lpi callbacks: - macb_tx_lpi_set(): sets or clears TXLPIEN; requires bp->lock to be held by the caller (asserted with lockdep_assert_held). Returns bool indicating whether the register actually changed, avoiding redundant writes and unnecessary udelay on the xmit fast path. - macb_tx_lpi_work_fn(): delayed_work handler that enters LPI if all TX queues are idle and EEE is still active. Takes bp->lock with irqsave before calling macb_tx_lpi_set(). - macb_tx_lpi_schedule(): arms the work timer using the LPI timer value provided by phylink (default 250 ms). Called from macb_tx_complete() after each TX drain so the idle countdown restarts whenever the ring goes quiet. - macb_tx_lpi_wake(): called from macb_start_xmit() under bp->lock, immediately before TSTART. Returns early if eee_active is false to avoid a register read on the common path when EEE is disabled. Clears TXLPIEN and applies a 50 us udelay for PHY wake (IEEE 802.3az Tw_sys_tx is 16.5 us for 1000BASE-T / 30 us for 100BASE-TX; GEM has no hardware enforcement). Only delays when TXLPIEN was actually set. The delay is placed after tx_head is advanced so the work_fn's queue-idle check sees a non-empty ring and cannot race back into LPI before the frame is transmitted. - mac_enable_tx_lpi: stores the timer and sets eee_active under bp->lock, then defers the first LPI entry by 1 second per IEEE 802.3az section 22.7a. - mac_disable_tx_lpi: cancels the work (sync, without the lock to avoid deadlock with the work_fn), then takes bp->lock to clear eee_active and deassert TXLPIEN. Populate phylink_config lpi_interfaces (MII, GMII, RGMII variants) and lpi_capabilities (MAC_100FD | MAC_1000FD) so phylink can negotiate EEE with the PHY and call the callbacks appropriately. Set lpi_timer_default to 250000 us and eee_enabled_default to true. Reviewed-by: Claudiu Beznea <claudiu.beznea@tuxon.dev> Reviewed-by: Théo Lebrun <theo.lebrun@bootlin.com> Signed-off-by: Nicolai Buchwitz <nb@tipi-net.de> Link: https://patch.msgid.link/20260304105432.631186-3-nb@tipi-net.de Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. Quick Start ----------- * Report a bug: See Documentation/admin-guide/reporting-issues.rst * Get the latest kernel: https://kernel.org * Build the kernel: See Documentation/admin-guide/quickly-build-trimmed-linux.rst * Join the community: https://lore.kernel.org/ Essential Documentation ----------------------- All users should be familiar with: * Building requirements: Documentation/process/changes.rst * Code of Conduct: Documentation/process/code-of-conduct.rst * License: See COPYING Documentation can be built with make htmldocs or viewed online at: https://www.kernel.org/doc/html/latest/ Who Are You? ============ Find your role below: * New Kernel Developer - Getting started with kernel development * Academic Researcher - Studying kernel internals and architecture * Security Expert - Hardening and vulnerability analysis * Backport/Maintenance Engineer - Maintaining stable kernels * System Administrator - Configuring and troubleshooting * Maintainer - Leading subsystems and reviewing patches * Hardware Vendor - Writing drivers for new hardware * Distribution Maintainer - Packaging kernels for distros * AI Coding Assistant - LLMs and AI-powered development tools For Specific Users ================== New Kernel Developer -------------------- Welcome! Start your kernel development journey here: * Getting Started: Documentation/process/development-process.rst * Your First Patch: Documentation/process/submitting-patches.rst * Coding Style: Documentation/process/coding-style.rst * Build System: Documentation/kbuild/index.rst * Development Tools: Documentation/dev-tools/index.rst * Kernel Hacking Guide: Documentation/kernel-hacking/hacking.rst * Core APIs: Documentation/core-api/index.rst Academic Researcher ------------------- Explore the kernel's architecture and internals: * Researcher Guidelines: Documentation/process/researcher-guidelines.rst * Memory Management: Documentation/mm/index.rst * Scheduler: Documentation/scheduler/index.rst * Networking Stack: Documentation/networking/index.rst * Filesystems: Documentation/filesystems/index.rst * RCU (Read-Copy Update): Documentation/RCU/index.rst * Locking Primitives: Documentation/locking/index.rst * Power Management: Documentation/power/index.rst Security Expert --------------- Security documentation and hardening guides: * Security Documentation: Documentation/security/index.rst * LSM Development: Documentation/security/lsm-development.rst * Self Protection: Documentation/security/self-protection.rst * Reporting Vulnerabilities: Documentation/process/security-bugs.rst * CVE Procedures: Documentation/process/cve.rst * Embargoed Hardware Issues: Documentation/process/embargoed-hardware-issues.rst * Security Features: Documentation/userspace-api/seccomp_filter.rst Backport/Maintenance Engineer ----------------------------- Maintain and stabilize kernel versions: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * Backporting Guide: Documentation/process/backporting.rst * Applying Patches: Documentation/process/applying-patches.rst * Subsystem Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git for Maintainers: Documentation/maintainer/configure-git.rst System Administrator -------------------- Configure, tune, and troubleshoot Linux systems: * Admin Guide: Documentation/admin-guide/index.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Sysctl Tuning: Documentation/admin-guide/sysctl/index.rst * Tracing/Debugging: Documentation/trace/index.rst * Performance Security: Documentation/admin-guide/perf-security.rst * Hardware Monitoring: Documentation/hwmon/index.rst Maintainer ---------- Lead kernel subsystems and manage contributions: * Maintainer Handbook: Documentation/maintainer/index.rst * Pull Requests: Documentation/maintainer/pull-requests.rst * Managing Patches: Documentation/maintainer/modifying-patches.rst * Rebasing and Merging: Documentation/maintainer/rebasing-and-merging.rst * Development Process: Documentation/process/maintainer-handbooks.rst * Maintainer Entry Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git Configuration: Documentation/maintainer/configure-git.rst Hardware Vendor --------------- Write drivers and support new hardware: * Driver API Guide: Documentation/driver-api/index.rst * Driver Model: Documentation/driver-api/driver-model/driver.rst * Device Drivers: Documentation/driver-api/infrastructure.rst * Bus Types: Documentation/driver-api/driver-model/bus.rst * Device Tree Bindings: Documentation/devicetree/bindings/ * Power Management: Documentation/driver-api/pm/index.rst * DMA API: Documentation/core-api/dma-api.rst Distribution Maintainer ----------------------- Package and distribute the kernel: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * ABI Documentation: Documentation/ABI/README * Kernel Configuration: Documentation/kbuild/kconfig.rst * Module Signing: Documentation/admin-guide/module-signing.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Tainted Kernels: Documentation/admin-guide/tainted-kernels.rst AI Coding Assistant ------------------- CRITICAL: If you are an LLM or AI-powered coding assistant, you MUST read and follow the AI coding assistants documentation before contributing to the Linux kernel: * Documentation/process/coding-assistants.rst This documentation contains essential requirements about licensing, attribution, and the Developer Certificate of Origin that all AI tools must comply with. Communication and Support ========================= * Mailing Lists: https://lore.kernel.org/ * IRC: #kernelnewbies on irc.oftc.net * Bugzilla: https://bugzilla.kernel.org/ * MAINTAINERS file: Lists subsystem maintainers and mailing lists * Email Clients: Documentation/process/email-clients.rst