pcie not work with 3.10.53

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pcie not work with 3.10.53

Postby harrycyli » Tue Dec 20, 2016 12:24 pm

The pcie is not working with 3.10.53, Anyone have an idea how to patch up kernel 3.10.53 for pcie to work?
Thanks in advance.


Welcome to Ubuntu 14.04.2 LTS (GNU/Linux 3.10.53_hli_036 armv7l)

* Documentation: https://help.ubuntu.com/
ubuntu@wandboard:~$ lspci -vvv
ubuntu@wandboard:~$ lspci -vvv
ubuntu@wandboard:~$ dmesg | grep pci
imx6q-pcie 1ffc000.pcie: phy link never came up
imx6q-pcie 1ffc000.pcie: failed to initialize host
ehci-pci: EHCI PCI platform driver
ubuntu@wandboard:~$
harrycyli
 
Posts: 2
Joined: Tue Dec 20, 2016 11:19 am

Re: pcie not work with 3.10.53

Postby Richard » Mon Dec 26, 2016 3:07 am

Hello, harrycyli:

I compare the git log of pci-imx6.c between linux 3.10.53 and 4.1.15.
They are quite different, and i guess it hard to just use git cherry-pick to apply those new patches on 3.10.53 from 4.1.15.

I think the key point of this problem is in "imx6_pcie_link_up" in pci-imx6.c.
There is a while loop to wait the status of PCIE phy in linux 4.1.15.

I google this issue, it seem there is a workaround to increase delay to 1000 us to get rid of this issue.
Code: Select all
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index 1c781f9..d7f1a40 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -442,7 +442,7 @@ static int imx6_pcie_wait_for_link(struct pcie_port *pp)
        int count = 200;

        while (!dw_pcie_link_up(pp)) {
-               udelay(100);
+               udelay(1000);
                if (--count)
                        continue;
Richard
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Re: pcie not work with 3.10.53

Postby harrycyli » Thu Dec 29, 2016 11:52 am

Richard,

I just download ubuntu 16.04 with kernel 4.1.15, pcie still not working:
pw23.txt
(33.27 KiB) Downloaded 15 times

Here is the .config file:
config.txt
(122.83 KiB) Downloaded 18 times
harrycyli
 
Posts: 2
Joined: Tue Dec 20, 2016 11:19 am


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