6.16-stable review patch. If anyone has any objections, please let me know.
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From: Lad Prabhakar prabhakar.mahadev-lad.rj@bp.renesas.com
commit a7195a3d67dace056af7ca65144a11874df79562 upstream.
Correct the Mode Control Register (MODCTRL) offset for RZ/N MIIC. According to the R-IN Engine and Ethernet Peripherals Manual (Rev.1.30) [0], Table 10.1 "Ethernet Accessory Register List", MODCTRL is at offset 0x8, not 0x20 as previously defined.
Offset 0x20 actually maps to the Port Trigger Control Register (PTCTRL), which controls PTP_MODE[3:0] and RGMII_CLKSEL[4]. Using this incorrect definition prevented the driver from configuring the SW_MODE[4:0] bits in MODCTRL, which control the internal connection of Ethernet ports. As a result, the MIIC could not be switched into the correct mode, leading to link setup failures and non-functional Ethernet ports on affected systems.
[0] https://www.renesas.com/en/document/mah/rzn1d-group-rzn1s-group-rzn1l-group-...
Fixes: 7dc54d3b8d91 ("net: pcs: add Renesas MII converter driver") Cc: stable@kernel.org Signed-off-by: Lad Prabhakar prabhakar.mahadev-lad.rj@bp.renesas.com Reviewed-by: Wolfram Sang wsa+renesas@sang-engineering.com Reviewed-by: Russell King (Oracle) rmk+kernel@armlinux.org.uk Reviewed-by: Geert Uytterhoeven geert+renesas@glider.be Tested-by: Wolfram Sang wsa+renesas@sang-engineering.com Link: https://patch.msgid.link/20250901112019.16278-1-prabhakar.mahadev-lad.rj@bp.... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/pcs/pcs-rzn1-miic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/pcs/pcs-rzn1-miic.c +++ b/drivers/net/pcs/pcs-rzn1-miic.c @@ -19,7 +19,7 @@ #define MIIC_PRCMD 0x0 #define MIIC_ESID_CODE 0x4
-#define MIIC_MODCTRL 0x20 +#define MIIC_MODCTRL 0x8 #define MIIC_MODCTRL_SW_MODE GENMASK(4, 0)
#define MIIC_CONVCTRL(port) (0x100 + (port) * 4)