[OpenWrt-Devel] [PATCH 6/6] bcm53xx: R8000 handle PEX8603 switch

[Hauke Mehrtens]

On 08/16/2015 06:19 AM, Ian Kent wrote:
> On Tue, 2015-06-23 at 07:58 +0800, Ian Kent wrote:
>> On Mon, 2015-06-22 at 18:42 +0200, Hauke Mehrtens wrote:
>>>
>>> On 03/10/2015 04:30 AM, Ian Kent wrote:
>>>> The Netgear R8000 has a PEX8603 connected to the BCM53012 and if
>>>> it isn't configured during the bus scan the PCI layer goes crazy
>>>> trying to configure phantom devices.
>>>
>>> Could you provide some diagram how this is connected?
>>
>> I could try, when I get a chance, ascii art isn't my strong suit.
>>
>>>
>>> My current assumption is that on one of the 3 PCIe ports is this switch,
>>> so the scan will find this switch as a PCIe device, bu how does it go
>>> from there?
>>
>> I can only infer from looking at sysfs, which is what I have done.
>>
>> Perhaps I'm not correct but it looks to me that there are is a BCM53012
>> connected with two legs, one has one wireless device, and the other has
>> a PEX8603 bridge which has two legs, each with a wireless device.
>>
>>> From the vendor driver I would assume that that the two devices behind
>>> the switch are device function 0x08 and 0x10 on the switch device.
>>
>> I'll have to reacquaint myself with the code before I respond to the
>> comments below, its been a while.
>>  
>>>
>>> Can you also post the output of lspci on your device?
>>
>> Don't think I have lspci in the build I was using, I'll need to add it
>> and rebuild. That probably won't be until the weekend.
> 
> OK, I've been able get a build.

I think we do not get this into OpenWrt CC any more. You should probably
base your work on top of the new PCIe host driver in the trunk used with
kernel 4.1.

Will you send a new Version or should I look into this?

> My updated patch doesn't yet function so I've used the driver we're
> discussing here to get info.
> 
> TBH, looking at this, I'm not so sure the patch is wrong now.
> 
> lspci gives:
> 0000:00:00.0 PCI bridge: Broadcom Corporation Device 8012 (rev 01)
> 0000:01:00.0 Network controller: Broadcom Corporation Device aa52 (rev 01)
> 0001:00:00.0 PCI bridge: Broadcom Corporation Device 8012 (rev 01)
> 0001:01:00.0 PCI bridge: PLX Technology, Inc. Device 8603 (rev ab)
> 0001:02:01.0 PCI bridge: PLX Technology, Inc. Device 8603 (rev ab)
> 0001:02:02.0 PCI bridge: PLX Technology, Inc. Device 8603 (rev ab)
> 0001:03:00.0 Network controller: Broadcom Corporation Device aa52 (rev 01)
> 0001:04:00.0 Network controller: Broadcom Corporation Device aa52 (rev 01)
> 
> and a list of /sys/bus/pci/devices on a Vendor firmware install gives:
> 0000:00:00.0  0000:00:06.0  0000:00:0b.1  0000:00:11.0  0002:01:00.0
> 0000:00:01.0  0000:00:07.0  0000:00:0c.0  0000:00:12.0  0002:02:01.0
> 0000:00:02.0  0000:00:08.0  0000:00:0d.0  0000:00:13.0  0002:02:02.0
> 0000:00:03.0  0000:00:09.0  0000:00:0e.0  0001:00:00.0  0002:03:00.0
> 0000:00:04.0  0000:00:0a.0  0000:00:0f.0  0001:01:00.0  0002:04:00.0
> 0000:00:05.0  0000:00:0b.0  0000:00:10.0  0002:00:00.0

Thanks for these information.
Without your patch the PCI subsystem will find lots of strange devices
and will report broken data and does not only show nothing, is that
correct?

> which looks like the topology is the same.
> 
> So, possibly, my description of how I believe the devices are connected
> is accurate.
> 
> 	    bcm8012
> 	 ------------
> 	 |	    |
> 	aa52	 pex8603
> 		 -------
> 		 |     |
> 		aa52  aa52
> 
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