b43: route d11 corerev 22 to 24-bit indirect radio access

Rev 22 backports the older 802.11 core but pairs it with a radio
in the 2057 family, which requires the 24-bit indirect path. With
the current dispatch, corerev 22 falls into the legacy 4-wire branch,
reads garbage for radio_id, and bails out with -EOPNOTSUPP at the
"FOUND UNSUPPORTED RADIO" branch below.

brcmsmac handles the same silicon family with the equivalent
dispatch in drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/
phy_cmn.c read_radio_reg() and write_radio_reg():

    if ((D11REV_GE(pi->sh->corerev, 24)) ||
        (D11REV_IS(pi->sh->corerev, 22)
         && (pi->pubpi.phy_type != PHY_TYPE_SSN))) {
            /* radioregaddr / radioregdata (indirect) */
    } else {
            /* phy4waddr / phy4wdatalo (legacy)      */
    }

b43 does not support SSN/SSLPN PHYs - they are rejected earlier in
b43_phy_versioning() at the "unsupported PHY type" switch - so just
adding the check corerev == 22 will do.

Assisted-by: Claude:claude-4.7-opus
Signed-off-by: Alessio Ferri <alessio.ferri@mythread.it>
Acked-by: Michael Büsch <m@bues.ch>
Reviewed-by: Joshua Peisach <jpeisach@ubuntu.com>
Link: https://patch.msgid.link/20260528-b43_complete_n_phy_rev_8_radio_2057_rev_8_support-v4-3-464566194d47@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/drivers/net/wireless/broadcom/b43/main.c b/drivers/net/wireless/broadcom/b43/main.c
index 85ea8fdd9c0efd98eb06344ab90596ebf264a1f5..783af26cb6f0670ed0023f9def324cb33384b8cb 100644 (file)
--- a/drivers/net/wireless/broadcom/b43/main.c
+++ b/drivers/net/wireless/broadcom/b43/main.c
@@ -4563,7 +4563,11 @@ static int b43_phy_versioning(struct b43_wldev *dev)
                radio_id = b43_read16(dev, B43_MMIO_RADIO24_DATA);
 
                radio_ver = 0; /* Is there version somewhere? */
-       } else if (core_rev >= 24) {
+       } else if (core_rev >= 24 || core_rev == 22) {
+               /*
+                * D11 corerev 22 pairs an older 802.11 core with a 2057
+                * radio that requires the 24-bit indirect access path.
+                */
                u16 radio24[3];
 
                for (tmp = 0; tmp < 3; tmp++) {