[LEDE-DEV] [PATCH] kernel: b53: enable port 5 on BCM53125

[Florian Fainelli]

Le 17/08/2016 à 23:06, Rafał Miłecki a écrit :
> On 17 August 2016 at 12:28, Jonas Gorski <jonas.gorski at gmail.com> wrote:
>> On 16 August 2016 at 16:47, Rafał Miłecki <zajec5 at gmail.com> wrote:
>>> From: Rafał Miłecki <rafal at milecki.pl>
>>>
>>> On all devices suppored so far BCM53125 got port 8 connected to the SoC
>>> interface and ports 0-4 to physical ports. On BCM53573 there is slightly
>>> more comlex setup. We have 2 SoC interfaces: one (eth0) connected to
>>> port 8 and another (eth1) connected to port 5. This change allows using
>>> port 5 to fully support such case. It also enables port 8 by default
>>> which would be added during init anyway.
>>>
>>> Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
>>> ---
>>>  target/linux/generic/files/drivers/net/phy/b53/b53_common.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/target/linux/generic/files/drivers/net/phy/b53/b53_common.c b/target/linux/generic/files/drivers/net/phy/b53/b53_common.c
>>> index d96d8b8..1a1be82 100644
>>> --- a/target/linux/generic/files/drivers/net/phy/b53/b53_common.c
>>> +++ b/target/linux/generic/files/drivers/net/phy/b53/b53_common.c
>>> @@ -1206,7 +1206,7 @@ static const struct b53_chip_data b53_switch_chips[] = {
>>>                 .dev_name = "BCM53125",
>>>                 .alias = "bcm53125",
>>>                 .vlans = 4096,
>>> -               .enabled_ports = 0x1f,
>>> +               .enabled_ports = 0x13f,
>>
>> is there maybe some way of autodetecting this? maybe check if the
>> appropriate port override registers are set or so? Maybe we can use
>> the strap bus register for that?
> 
> In BCM53573 the initial state of B53_GMII_PORT_OVERRIDE_CTRL(5) is
> 0x0b (GMII_PO_LINK | GMII_PO_FULL_DUPLEX | GMII_PO_SPEED_100M). It
> doesn't have GMII_PO_EN set, so we can't use this register to check if
> port 5 is used/connected to some interface.

Using this technique is not quite reliable since you basically depend on
the bootloader having configured this properly for you which may not be
the case at all.

> I just checked my old BCM4706 with BCM53125 and it has initial value
> of above register equal to 0x0b as well.
> 
> As we talked yesterday, B53_STRAP_VALUE register contains value
> 0x000000180f2c so it doesn't have SV_GMII_CTRL_115 set. On the other
> hand my BCM4706 with BCM53125 has B53_STRAP_VALUE: equal to
> 0x00000002be2c so there are some differences. Any idea what these
> other bits may mean?

AFAICT this register is not defined for the 53125 so you are reading
undefined values here.

You could try to read the WAN_PORT_MAP in 0x00, 0x26 (16 bits) and see
if it's already configured for Port 5 which would indicate that Port 5
is configured as WAN, thus usable.
-- 
Florian