…et/browse/AR-1904

Description

Using the Rock Pi S with 10mbps Ethernet connection is not possible. A connection is shown but data transmission is not possible.

Note that this patch is only for the "current" kernel. The "edge" kernel no longer boots RockPI-S.

Jira reference number AR-1904

How Has This Been Tested?

Built 23.05 Minimal image for RockPI-S

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• Verified Ethernet transfer @100Mbit/s initially
• ethtool -s end0 advertise 3
• Verified Ethernet transfer rate now only 10Mbit/s
• ethtool -s end0 advertise f
• Verified Ethernet transfer rate restored to 100Mbit/s

Bug was a regression first seen in the 5.15 Armbian kernel caused by a rewrite of speed setting for rk3308 in dwmc-rk.c that for some bizarre reason completely omitted the code needed to reprogram the MAC clock as appropriate for the selected Ethernet speed.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] Any dependent changes have been merged and published in downstream modules

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