| Message ID | 1424372967-27938-1-git-send-email-f.fainelli@gmail.com |
|---|---|
| State | Accepted, archived |
| Delegated to: | David Miller |
| Headers | show |
From: Florian Fainelli <f.fainelli@gmail.com> Date: Thu, 19 Feb 2015 11:09:27 -0800 > 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: 246d7f773c13 ("net: dsa: add Broadcom SF2 switch driver") > Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Applied, thanks Florian. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/net/dsa/bcm_sf2.h b/drivers/net/dsa/bcm_sf2.h index ee9f650d5026..7b7053d3c5fa 100644 --- a/drivers/net/dsa/bcm_sf2.h +++ b/drivers/net/dsa/bcm_sf2.h @@ -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; \ } \
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: 246d7f773c13 ("net: dsa: add Broadcom SF2 switch driver") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> --- drivers/net/dsa/bcm_sf2.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)