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net: dsa: bcm_sf2: fix 64-bits register reads

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Reading 64-bits register was not working because we inverted the steps
between reading the lower 32-bits of the register and reading the upper
32-bits. Swapping these operations is how the HW guarantees that 64-bits
reads are latched correctly. We only have a handful of 64-bits registers
for now, mostly MIB counters, so the imapct is low.

Fixes: 246d7f773c ("net: dsa: add Broadcom SF2 switch driver")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2015-02-19 11:09:27 -08:00 committed by David S. Miller
parent 6dd0c1655b
commit ddede6d536
1 changed files with 1 additions and 1 deletions
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2
drivers/net/dsa/bcm_sf2.h
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@ -105,8 +105,8 @@ static inline u64 name##_readq(struct bcm_sf2_priv *priv, u32 off) \
{ \
u32 indir, dir; \
spin_lock(&priv->indir_lock); \
indir = reg_readl(priv, REG_DIR_DATA_READ); \
dir = __raw_readl(priv->name + off); \
indir = reg_readl(priv, REG_DIR_DATA_READ); \
spin_unlock(&priv->indir_lock); \
return (u64)indir << 32 | dir; \
} \