[PATCH net 2/2] microchip: lan865x: fix missing configuration for Rev.B0/B1 as per AN1760
From: Parthiban Veerasooran <parthiban.veerasooran@microchip.com>
Date: 2025-08-13 10:34:15
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microchip lan8650/1 10base-t1s macphy ethernet driver, networking drivers, the rest · Maintainers:
Parthiban Veerasooran, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Fix missing configuration required for LAN865x silicon revisions B0 and B1, as documented in Microchip Application Note AN1760 (Revision F, June 2024). According to the guidance in the application note, register 0x10077 must be programmed with the value 0x0028 to ensure correct operation on Rev.B0/B1 devices. Without this fixup, the device may not function correctly or may fail to initialize. Reference: https://www.microchip.com/en-us/application-notes/an1760 Fixes: 5cd2340cb6a3 ("microchip: lan865x: add driver support for Microchip's LAN865X MAC-PHY") Signed-off-by: Parthiban Veerasooran <parthiban.veerasooran@microchip.com> --- drivers/net/ethernet/microchip/lan865x/lan865x.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/drivers/net/ethernet/microchip/lan865x/lan865x.c b/drivers/net/ethernet/microchip/lan865x/lan865x.c
index d03f5a8de58d..a55ca485062f 100644
--- a/drivers/net/ethernet/microchip/lan865x/lan865x.c
+++ b/drivers/net/ethernet/microchip/lan865x/lan865x.c@@ -32,6 +32,14 @@ /* MAC Specific Addr 1 Top Reg */ #define LAN865X_REG_MAC_H_SADDR1 0x00010023 +/* LAN865x Rev.B0/B1 configuration parameters from AN1760 + * As per the Configuration Application Note AN1760 published in the below link, + * https://www.microchip.com/en-us/application-notes/an1760 + * Revision F (DS60001760G - June 2024) + */ +#define LAN865X_REG_FIXUP 0x00010077 +#define LAN865X_FIXUP_VALUE 0x0028 + struct lan865x_priv { struct work_struct multicast_work; struct net_device *netdev;
@@ -346,6 +354,14 @@ static int lan865x_probe(struct spi_device *spi) goto free_netdev; } + /* LAN8650/1 configuration fixup from AN1760 */ + ret = oa_tc6_write_register(priv->tc6, LAN865X_REG_FIXUP, + LAN865X_FIXUP_VALUE); + if (ret) { + dev_err(&spi->dev, "Failed to configure fixup: %d\n", ret); + goto oa_tc6_exit; + } + /* As per the point s3 in the below errata, SPI receive Ethernet frame * transfer may halt when starting the next frame in the same data block * (chunk) as the end of a previous frame. The RFA field should be
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2.34.1