When switching from one 5 GHz channel to another 5 GHz channel we need
to make sure BPHY is still in a reset. However to access BPHY register
we have to switch to 2 GHz mode for a moment. Otherwise this may result
in "Data bus error" (noticed by Hauke with BCM43224 connected to the
SoC).
Reported-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
Signed-off-by: Rafał Miłecki <zajec5@xxxxxxxxx>
---
drivers/net/wireless/b43/phy_n.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/wireless/b43/phy_n.c b/drivers/net/wireless/b43/phy_n.c
index 1eead7a..e2a3f0d 100644
--- a/drivers/net/wireless/b43/phy_n.c
+++ b/drivers/net/wireless/b43/phy_n.c
@@ -6217,6 +6217,9 @@ static void b43_nphy_channel_setup(struct b43_wldev *dev,
u16 tmp16;
if (new_channel->band == IEEE80211_BAND_5GHZ) {
+ /* Switch to 2 GHz for a moment to access B43_PHY_B_BBCFG */
+ b43_phy_mask(dev, B43_NPHY_BANDCTL, ~B43_NPHY_BANDCTL_5GHZ);
+
tmp16 = b43_read16(dev, B43_MMIO_PSM_PHY_HDR);
b43_write16(dev, B43_MMIO_PSM_PHY_HDR, tmp16 | 4);
/* Put BPHY in the reset */
--
1.8.4.5
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