linux-kernel - Re: msm8996: qcom-qmp: apq8096-db820c fails to boot, reset back to fastboot and locks up

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Message-ID: <20190612140911.GA16863@harukaze>
Date:   Wed, 12 Jun 2019 16:09:11 +0200
From:   Paolo Pisati <p.pisati@...il.com>
To:     Niklas Cassel <niklas.cassel@...aro.org>
Cc:     Paolo Pisati <p.pisati@...il.com>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: msm8996: qcom-qmp: apq8096-db820c fails to boot, reset back to
 fastboot and locks up

On Wed, Jun 12, 2019 at 03:17:35PM +0200, Niklas Cassel wrote:
> > diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
> > index cd91b4179b10..22352e3b0ec5 100644
> > --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> > +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> > @@ -1490,7 +1490,7 @@ static int qcom_qmp_phy_enable(struct phy *phy)
> >  
> >         ret = qcom_qmp_phy_com_init(qphy);
> >         if (ret)
> > -               return ret;
> > +               goto err_lane_rst;
> >  
> >         if (cfg->has_lane_rst) {
> >                 ret = reset_control_deassert(qphy->lane_rst);

Hi Niklas,
unfortunately, it didn't help - i added a printk, to highlight when it failed:

--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -1489,8 +1489,10 @@ static int qcom_qmp_phy_enable(struct phy *phy)
        }
 
        ret = qcom_qmp_phy_com_init(qphy);
-       if (ret)
-               return ret;
+       if (ret) {
+               dev_err(qmp->dev, "qphy initialization failed\n");
+               goto err_lane_rst;
+       }
 
        if (cfg->has_lane_rst) {
                ret = reset_control_deassert(qphy->lane_rst);

After several reboots i was able to trigger the phy init failure again:

...
[    2.223999] qcom-qmp-phy 34000.phy: Registered Qcom-QMP phy
[    2.224956] qcom-qmp-phy 7410000.phy: Registered Qcom-QMP phy
[    2.228798] ufs_qcom_phy_qmp_14nm 627000.phy: invalid resource
[    2.237271] qcom-qmp-phy 34000.phy: phy common block init timed-out
[    2.240315] qcom-qmp-phy 34000.phy: qphy initialization failed
...

these are the last lines printed, before rebooting in fastboot and
locking up there (as before[*]).

So, as far as i understand there are two distinct problems:

1) sometimes, qcom-qmp-phy fails to initialize

2) and when that happens, the failure is fatal and it led to a reboot & lockup
in fastboot

1: https://pastebin.ubuntu.com/p/rtjVrD3yzk/
-- 
bye,
p.