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Message-Id: <20250531101308.155757-4-noltari@gmail.com>
Date: Sat, 31 May 2025 12:13:01 +0200
From: Álvaro Fernández Rojas <noltari@...il.com>
To: jonas.gorski@...il.com,
florian.fainelli@...adcom.com,
andrew@...n.ch,
olteanv@...il.com,
davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
vivien.didelot@...il.com,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
dgcbueu@...il.com
Cc: Álvaro Fernández Rojas <noltari@...il.com>
Subject: [RFC PATCH 03/10] net: dsa: b53: prevent SWITCH_CTRL access on BCM5325
BCM5325 doesn't implement SWITCH_CTRL register so we should avoid reading
or writing it.
Fixes: a424f0de6163 ("net: dsa: b53: Include IMP/CPU port in dumb forwarding mode")
Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
---
drivers/net/dsa/b53/b53_common.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index d1249aac6136..f314aeb81643 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -360,11 +360,12 @@ static void b53_set_forwarding(struct b53_device *dev, int enable)
b53_write8(dev, B53_CTRL_PAGE, B53_SWITCH_MODE, mgmt);
- /* Include IMP port in dumb forwarding mode
- */
- b53_read8(dev, B53_CTRL_PAGE, B53_SWITCH_CTRL, &mgmt);
- mgmt |= B53_MII_DUMB_FWDG_EN;
- b53_write8(dev, B53_CTRL_PAGE, B53_SWITCH_CTRL, mgmt);
+ if (!is5325(dev)) {
+ /* Include IMP port in dumb forwarding mode */
+ b53_read8(dev, B53_CTRL_PAGE, B53_SWITCH_CTRL, &mgmt);
+ mgmt |= B53_MII_DUMB_FWDG_EN;
+ b53_write8(dev, B53_CTRL_PAGE, B53_SWITCH_CTRL, mgmt);
+ }
/* Look at B53_UC_FWD_EN and B53_MC_FWD_EN to decide whether
* frames should be flooded or not.
--
2.39.5
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