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b43: N-PHY: fix "Data bus error" while working in 5 GHz

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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@hauke-m.de>
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Rafał Miłecki 2014-07-30 23:02:30 +02:00 committed by John W. Linville
parent b9d317040a
commit 11d14c7921
1 changed files with 3 additions and 0 deletions
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3
drivers/net/wireless/b43/phy_n.c
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@ -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 */