6.12-stable review patch. If anyone has any objections, please let me know.
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From: Jonas Gorski jonas.gorski@gmail.com
commit 1237c2d4a8db79dfd4369bff6930b0e385ed7d5c upstream.
BCM63xx internal switches do not support EEE, but provide multiple RGMII ports where external PHYs may be connected. If one of these PHYs are EEE capable, we may try to enable EEE for the MACs, which then hangs the system on access of the (non-existent) EEE registers.
Fix this by checking if the switch actually supports EEE before attempting to configure it.
Fixes: 22256b0afb12 ("net: dsa: b53: Move EEE functions to b53") Reviewed-by: Florian Fainelli florian.fainelli@broadcom.com Tested-by: Álvaro Fernández Rojas noltari@gmail.com Signed-off-by: Jonas Gorski jonas.gorski@gmail.com Link: https://patch.msgid.link/20250602193953.1010487-2-jonas.gorski@gmail.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Harshit Mogalapalli harshit.m.mogalapalli@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/dsa/b53/b53_common.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/net/dsa/b53/b53_common.c +++ b/drivers/net/dsa/b53/b53_common.c @@ -2378,6 +2378,9 @@ int b53_eee_init(struct dsa_switch *ds, { int ret;
+ if (!b53_support_eee(ds, port)) + return 0; + ret = phy_init_eee(phy, false); if (ret) return 0; @@ -2392,7 +2395,7 @@ bool b53_support_eee(struct dsa_switch * { struct b53_device *dev = ds->priv;
- return !is5325(dev) && !is5365(dev); + return !is5325(dev) && !is5365(dev) && !is63xx(dev); } EXPORT_SYMBOL(b53_support_eee);