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net: dsa: b53: Fix calculating number of switch ports

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[ Upstream commit cdb067d31c ]

It isn't true that CPU port is always the last one. Switches BCM5301x
have 9 ports (port 6 being inactive) and they use port 5 as CPU by
default (depending on design some other may be CPU ports too).

A more reliable way of determining number of ports is to check for the
last set bit in the "enabled_ports" bitfield.

This fixes b53 internal state, it will allow providing accurate info to
the DSA and is required to fix BCM5301x support.

Fixes: 967dd82ffc ("net: dsa: b53: Add support for Broadcom RoboSwitch")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rafał Miłecki 2021-09-02 10:30:50 +02:00 • committed by Greg Kroah-Hartman
commit 0db7e0d9f6
1 changed files with 1 additions and 2 deletions
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3
drivers/net/dsa/b53/b53_common.c
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@ -2556,9 +2556,8 @@ static int b53_switch_init(struct b53_device *dev)
dev->cpu_port = 5;
}
/* cpu port is always last */
dev->num_ports = dev->cpu_port + 1;
dev->enabled_ports |= BIT(dev->cpu_port);
dev->num_ports = fls(dev->enabled_ports);
/* Include non standard CPU port built-in PHYs to be probed */
if (is539x(dev) || is531x5(dev)) {