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net: systemport: Set correct RSB endian bits based on host

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RSB_SWAP0 needs to match the host CPU endian, and it needs to be set
for LE and clear for BE. RSB_SWAP1 must always be cleared for SYSTEMPORT
Lite.

With these settings, we have the Receive Status Block always match the
host endian and we do not need to perform any conversion. Since there is
not necessarily a CONFIG_CPU_LITTLE_ENDIAN option defined, we test for
!CONFIG_CPU_BIG_ENDIAN which is guaranteed to be set.

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 2017-08-29 13:35:17 -07:00 committed by David S. Miller
parent fdb71a2d1a
commit 389a06bc53
1 changed files with 6 additions and 2 deletions
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8
drivers/net/ethernet/broadcom/bcmsysport.c
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@ -1762,10 +1762,14 @@ static void rbuf_init(struct bcm_sysport_priv *priv)
reg = rbuf_readl(priv, RBUF_CONTROL);
reg |= RBUF_4B_ALGN | RBUF_RSB_EN;
/* Set a correct RSB format on SYSTEMPORT Lite */
if (priv->is_lite) {
if (priv->is_lite)
reg &= ~RBUF_RSB_SWAP1;
/* Set a correct RSB format based on host endian */
if (!IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
reg |= RBUF_RSB_SWAP0;
}
else
reg &= ~RBUF_RSB_SWAP0;
rbuf_writel(priv, reg, RBUF_CONTROL);
}