realtek: pcs: select OFF mode with no links on SerDes

Because the PCS driver keeps track of the number of registered links for
each SerDes now, we now know when there is no link on a SerDes. In this
case, determine to turn off the SerDes in the mode mapper.

Though the phylink subsystem shouldn't attempt to config something
different when no link/port references a Serdes, be on the safe side.

Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/21365
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

diff --git a/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c b/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c
index bd19bd5fb23f7c5c899f1b308b8cab77273d85e5..06647938d26e1721c409d50940038898969bfa3e 100644 (file)
--- a/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c
+++ b/target/linux/realtek/files-6.12/drivers/net/pcs/pcs-rtl-otto.c
@@ -287,6 +287,12 @@ static int rtpcs_sds_determine_hw_mode(struct rtpcs_serdes *sds,
 {
        u8 n_links = sds->num_of_links;
 
+       /* turn off SerDes when there are no links */
+       if (!n_links) {
+               *hw_mode = RTPCS_SDS_MODE_OFF;
+               return 0;
+       }
+
        switch (if_mode) {
        case PHY_INTERFACE_MODE_NA:
                *hw_mode = RTPCS_SDS_MODE_OFF;