[PATCH net v5 1/5] net: stmmac: fix incorrect GMAC_VLAN_TAG register writting in GMAC4+
From: Ong Boon Leong <hidden>
Date: 2020-02-07 07:33:50
Also in:
lkml, netdev
Subsystem:
networking drivers, stmmac ethernet driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Maxime Chevallier, Linus Torvalds
From: "Tan, Tee Min" <redacted>
It should always do a read of current value of GMAC_VLAN_TAG instead of
directly overwriting the register value.
Fixes: c1be0022df0d ("net: stmmac: Add VLAN HASH filtering support in GMAC4+")
Signed-off-by: Tan, Tee Min <redacted>
Signed-off-by: Ong Boon Leong <redacted>
---
drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
index f0c0ea616032..4d8eef9ff137 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c@@ -736,11 +736,14 @@ static void dwmac4_update_vlan_hash(struct mac_device_info *hw, u32 hash, __le16 perfect_match, bool is_double) { void __iomem *ioaddr = hw->pcsr; + u32 value; writel(hash, ioaddr + GMAC_VLAN_HASH_TABLE); + value = readl(ioaddr + GMAC_VLAN_TAG); + if (hash) { - u32 value = GMAC_VLAN_VTHM | GMAC_VLAN_ETV; + value |= GMAC_VLAN_VTHM | GMAC_VLAN_ETV; if (is_double) { value |= GMAC_VLAN_EDVLP; value |= GMAC_VLAN_ESVL;
@@ -759,8 +762,6 @@ static void dwmac4_update_vlan_hash(struct mac_device_info *hw, u32 hash, writel(value | perfect_match, ioaddr + GMAC_VLAN_TAG); } else { - u32 value = readl(ioaddr + GMAC_VLAN_TAG); - value &= ~(GMAC_VLAN_VTHM | GMAC_VLAN_ETV); value &= ~(GMAC_VLAN_EDVLP | GMAC_VLAN_ESVL); value &= ~GMAC_VLAN_DOVLTC;
--
2.17.1
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