Hi Rafal,
On 1/19/2016 11:02 PM, Rafał Miłecki wrote:
On 20 January 2016 at 07:53, Rafał Miłecki <zajec5@xxxxxxxxx> wrote:
In OpenWrt trunk code we use iProc driver for PCIe controllers on bcma
bus (PCIE_IPROC_BCMA). Right now we use 4.1 kernel but we backported
all iProc changes. Unfortunately backporting set queued for 4.5 broke
bus scanning on some routers.
Most BCM4708 / BCM4709 chipsets have 3 PCIe controllers. All known
routers use only first 2 of them. Even if router has 3 PCIe cards, the
last two cards are connected to the 2nd PCIe controller.
So that PAXC patch broke support for routers with 3 cards, 2 of them
at the 2nd controller. It doesn't affect routers with just 2 cards.
This problem was tracked down in:
https://dev.openwrt.org/ticket/21393
I'm attaching two OpenWrt boot logs.
1) r48381
It contains all backported iProc changes. The log looks "nice", but
only one card (0000:01:00.0) was detected.
2) r48382
It contains "Revert "PCI: iproc: Add PAXC interface support"" patch.
It contains many "[Firmware Bug]: reg 0x??: invalid BAR (can't size)"
messages but there are all 3 cards detected: 0000:01:00.0,
0001:03:00.0 and 0001:04:00.0 (see brcmfmac messages).
Can you take a look at this problem, please?
linux-arm-kernel@ stopped my e-mail due to its size. Sending
compressed attachments.
I'm a bit confused by these logs that you provided. Based on the log,
there seems to be 3 PCIe root complexes populated on the platform,
domain 0000:00:00.0, 0001:00:00:0, 0002:00:00:0 are the 3 root
complexes. Root complex 0002 seems to have nothing connected since it
does not detect any EP.
Is the first card installed on root complex 0 (domain 0000), but the
second card and 3rd card are both installed on root complex 1 (domain
0001) on different slots or something?
I suspect a potential issue is in this function:
173 static inline bool iproc_pcie_device_is_valid(struct iproc_pcie *pcie,
174 unsigned int slot,
175 unsigned int fn)
176 {
177 if (slot > 0)
178 return false;
179
180 /* PAXC can only support limited number of functions */
181 if (pcie->type == IPROC_PCIE_PAXC && fn >= MAX_NUM_PAXC_PF)
182 return false;
183
184 return true;
185 }
Compared to the original code, it's different. Can you try passing bus
number into the function as another argument and do the following check
on line 177:
if (busnum == 0 && slot > 0)
return false;
instead of
if (slot > 0)
return false;
Thanks,
Ray
--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
