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net: dsa: microchip: disable EEE for KSZ8567/KSZ9567/KSZ9896/KSZ9897.
As noted in the device errata [1-8], EEE support is not fully operational in the KSZ8567, KSZ9477, KSZ9567, KSZ9896, and KSZ9897 devices, causing link drops when connected to another device that supports EEE. The patch series "net: add EEE support for KSZ9477 switch family" merged in commit9b0bf4f771
caused EEE support to be enabled in these devices. A fix for this regression for the KSZ9477 alone was merged in commit08c6d8bae4
. This patch extends this fix to the other affected devices. [1] https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/Errata/KSZ8567R-Errata-DS80000752.pdf [2] https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/Errata/KSZ8567S-Errata-DS80000753.pdf [3] https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/Errata/KSZ9477S-Errata-DS80000754.pdf [4] https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/Errata/KSZ9567R-Errata-DS80000755.pdf [5] https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/Errata/KSZ9567S-Errata-DS80000756.pdf [6] https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/Errata/KSZ9896C-Errata-DS80000757.pdf [7] https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/Errata/KSZ9897R-Errata-DS80000758.pdf [8] https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/Errata/KSZ9897S-Errata-DS80000759.pdf Fixes:69d3b36ca0
("net: dsa: microchip: enable EEE support") # for KSZ8567/KSZ9567/KSZ9896/KSZ9897 Link: https://lore.kernel.org/netdev/137ce1ee-0b68-4c96-a717-c8164b514eec@martin-whitaker.me.uk/ Signed-off-by: Martin Whitaker <foss@martin-whitaker.me.uk> Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com> Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de> Reviewed-by: Lukasz Majewski <lukma@denx.de> Link: https://patch.msgid.link/20240807205209.21464-1-foss@martin-whitaker.me.uk Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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@ -2578,7 +2578,11 @@ static u32 ksz_get_phy_flags(struct dsa_switch *ds, int port)
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if (!port)
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return MICREL_KSZ8_P1_ERRATA;
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break;
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case KSZ8567_CHIP_ID:
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case KSZ9477_CHIP_ID:
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case KSZ9567_CHIP_ID:
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case KSZ9896_CHIP_ID:
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case KSZ9897_CHIP_ID:
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/* KSZ9477 Errata DS80000754C
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*
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* Module 4: Energy Efficient Ethernet (EEE) feature select must
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@ -2588,6 +2592,13 @@ static u32 ksz_get_phy_flags(struct dsa_switch *ds, int port)
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* controls. If not disabled, the PHY ports can auto-negotiate
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* to enable EEE, and this feature can cause link drops when
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* linked to another device supporting EEE.
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*
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* The same item appears in the errata for the KSZ9567, KSZ9896,
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* and KSZ9897.
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*
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* A similar item appears in the errata for the KSZ8567, but
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* provides an alternative workaround. For now, use the simple
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* workaround of disabling the EEE feature for this device too.
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*/
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return MICREL_NO_EEE;
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}
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