Re: [PATCH V2] PCI/ASPM: Save/restore L1SS Capability for suspend/resume

From: Lukasz Majczak
Date: Mon Aug 08 2022 - 10:08:16 EST

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śr., 3 sie 2022 o 14:55 Vidya Sagar <vidyas@xxxxxxxxxx> napisał(a):
>
> Thanks Lukasz for the logs.
> I still that the L1SS capability in the root port (00:14.0) disappeared
> after resume.
> I still don't understand how this patch can make the capability register
> itself disappear. Honestly, I still see this as a HW issue.
> Bjorn, could you please throw some light on this?
>
> Thanks,
> Vidya Sagar
>
> On 8/3/2022 5:34 PM, Lukasz Majczak wrote:
> > External email: Use caution opening links or attachments
> >
> >
> > pt., 29 lip 2022 o 16:36 Vidya Sagar <vidyas@xxxxxxxxxx> napisał(a):
> >>
> >> Hi Lukasz,
> >> Thanks for sharing your observations.
> >>
> >> Could you please also share the output of 'sudo lspci -vvvv' before and
> >> after suspend-resume cycle with the latest linux-next?
> >> Do we still see the L1SS capabilities getting disappeared post resume?
> >>
> >> Thanks,
> >> Vidya Sagar
> >>
> >> On 7/29/2022 3:09 PM, Lukasz Majczak wrote:
> >>> External email: Use caution opening links or attachments
> >>>
> >>>
> >>> wt., 26 lip 2022 o 09:20 Lukasz Majczak <lma@xxxxxxxxxxxx> napisał(a):
> >>>>
> >>>> wt., 26 lip 2022 o 00:51 Rajat Jain <rajatja@xxxxxxxxxx> napisał(a):
> >>>>>
> >>>>> Hello,
> >>>>>
> >>>>> On Sat, Jul 23, 2022 at 10:03 AM Vidya Sagar <vidyas@xxxxxxxxxx> wrote:
> >>>>>>
> >>>>>> Agree with Bjorn's observations.
> >>>>>> The fact that the L1SS capability registers themselves disappeared in
> >>>>>> the root port post resume indicates that there seems to be something
> >>>>>> wrong with the BIOS itself.
> >>>>>> Could you please check from that perspective?
> >>>>>
> >>>>> ChromeOS Intel platforms use S0ix (suspend-to-idle) for suspend. This
> >>>>> is a shallower sleep state that preserves more state than, for e.g. S3
> >>>>> (suspend-to-RAM). When we use S0ix, then BIOS does not come in picture
> >>>>> at all. i.e. after the kernel runs its suspend routines, it just puts
> >>>>> the CPU into S0ix state. So I do not think there is a BIOS angle to
> >>>>> this.
> >>>>>
> >>>>>
> >>>>>>
> >>>>>> Thanks,
> >>>>>> Vidya Sagar
> >>>>>>
> >>>>>>
> >>>>>> On 7/22/2022 11:12 PM, Bjorn Helgaas wrote:
> >>>>>>> External email: Use caution opening links or attachments
> >>>>>>>
> >>>>>>>
> >>>>>>> On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote:
> >>>>>>>> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> napisał(a):
> >>>>>>>>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@xxxxxxxxx> wrote:
> >>>>>>>>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@xxxxxxxxxx> wrote:
> >>>>>>>>>>>
> >>>>>>>>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't
> >>>>>>>>>>> saved and restored during suspend/resume leading to L1 Substates
> >>>>>>>>>>> configuration being lost post-resume.
> >>>>>>>>>>>
> >>>>>>>>>>> Save the L1 Substates control registers so that the configuration is
> >>>>>>>>>>> retained post-resume.
> >>>>>>>>>>>
> >>>>>>>>>>> Signed-off-by: Vidya Sagar <vidyas@xxxxxxxxxx>
> >>>>>>>>>>> Tested-by: Abhishek Sahu <abhsahu@xxxxxxxxxx>
> >>>>>>>>>>
> >>>>>>>>>> Hi Vidya,
> >>>>>>>>>>
> >>>>>>>>>> I tested this patch on kernel v5.19-rc6.
> >>>>>>>>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP.
> >>>>>>>>>> This patch can restore L1SS after suspend/resume.
> >>>>>>>>>>
> >>>>>>>>>> The test results are as follows:
> >>>>>>>>>>
> >>>>>>>>>> After Boot:
> >>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates"
> >>>>>>>>>> Capabilities: [110 v1] L1 PM Substates
> >>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+
> >>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+
> >>>>>>>>>> PortCommonModeRestoreTime=255us
> >>>>>>>>>> PortTPowerOnTime=3100us
> >>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+
> >>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns
> >>>>>>>>>> L1SubCtl2: T_PwrOn=3100us
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>> After suspend/resume without this patch.
> >>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates"
> >>>>>>>>>> Capabilities: [110 v1] L1 PM Substates
> >>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+
> >>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+
> >>>>>>>>>> PortCommonModeRestoreTime=255us
> >>>>>>>>>> PortTPowerOnTime=3100us
> >>>>>>>>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1-
> >>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=0ns
> >>>>>>>>>> L1SubCtl2: T_PwrOn=10us
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>> After suspend/resume with this patch.
> >>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates"
> >>>>>>>>>> Capabilities: [110 v1] L1 PM Substates
> >>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+
> >>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+
> >>>>>>>>>> PortCommonModeRestoreTime=255us
> >>>>>>>>>> PortTPowerOnTime=3100us
> >>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+
> >>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns
> >>>>>>>>>> L1SubCtl2: T_PwrOn=3100us
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>> Tested-by: Ben Chuang <benchuanggli@xxxxxxxxx>
> >>>>>>>>>
> >>>>>>>>> Forgot to add mine:
> >>>>>>>>> Tested-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
> >>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>> Best regards,
> >>>>>>>>>> Ben Chuang
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>> ---
> >>>>>>>>>>> Hi,
> >>>>>>>>>>> Kenneth R. Crudup <kenny@xxxxxxxxx>, Could you please verify this patch
> >>>>>>>>>>> on your laptop (Dell XPS 13) one last time?
> >>>>>>>>>>> IMHO, the regression observed on your laptop with an old version of the patch
> >>>>>>>>>>> could be due to a buggy old version BIOS in the laptop.
> >>>>>>>>>>>
> >>>>>>>>>>> Thanks,
> >>>>>>>>>>> Vidya Sagar
> >>>>>>>>>>>
> >>>>>>>>>>> drivers/pci/pci.c | 7 +++++++
> >>>>>>>>>>> drivers/pci/pci.h | 4 ++++
> >>>>>>>>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++
> >>>>>>>>>>> 3 files changed, 55 insertions(+)
> >>>>>>>>>>>
> >>>>>>>>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> >>>>>>>>>>> index cfaf40a540a8..aca05880aaa3 100644
> >>>>>>>>>>> --- a/drivers/pci/pci.c
> >>>>>>>>>>> +++ b/drivers/pci/pci.c
> >>>>>>>>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev)
> >>>>>>>>>>> return i;
> >>>>>>>>>>>
> >>>>>>>>>>> pci_save_ltr_state(dev);
> >>>>>>>>>>> + pci_save_aspm_l1ss_state(dev);
> >>>>>>>>>>> pci_save_dpc_state(dev);
> >>>>>>>>>>> pci_save_aer_state(dev);
> >>>>>>>>>>> pci_save_ptm_state(dev);
> >>>>>>>>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev)
> >>>>>>>>>>> * LTR itself (in the PCIe capability).
> >>>>>>>>>>> */
> >>>>>>>>>>> pci_restore_ltr_state(dev);
> >>>>>>>>>>> + pci_restore_aspm_l1ss_state(dev);
> >>>>>>>>>>>
> >>>>>>>>>>> pci_restore_pcie_state(dev);
> >>>>>>>>>>> pci_restore_pasid_state(dev);
> >>>>>>>>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev)
> >>>>>>>>>>> if (error)
> >>>>>>>>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n");
> >>>>>>>>>>>
> >>>>>>>>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS,
> >>>>>>>>>>> + 2 * sizeof(u32));
> >>>>>>>>>>> + if (error)
> >>>>>>>>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n");
> >>>>>>>>>>> +
> >>>>>>>>>>> pci_allocate_vc_save_buffers(dev);
> >>>>>>>>>>> }
> >>>>>>>>>>>
> >>>>>>>>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> >>>>>>>>>>> index e10cdec6c56e..92d8c92662a4 100644
> >>>>>>>>>>> --- a/drivers/pci/pci.h
> >>>>>>>>>>> +++ b/drivers/pci/pci.h
> >>>>>>>>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev);
> >>>>>>>>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev);
> >>>>>>>>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev);
> >>>>>>>>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev);
> >>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev);
> >>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev);
> >>>>>>>>>>> #else
> >>>>>>>>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { }
> >>>>>>>>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { }
> >>>>>>>>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { }
> >>>>>>>>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { }
> >>>>>>>>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { }
> >>>>>>>>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { }
> >>>>>>>>>>> #endif
> >>>>>>>>>>>
> >>>>>>>>>>> #ifdef CONFIG_PCIE_ECRC
> >>>>>>>>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
> >>>>>>>>>>> index a96b7424c9bc..2c29fdd20059 100644
> >>>>>>>>>>> --- a/drivers/pci/pcie/aspm.c
> >>>>>>>>>>> +++ b/drivers/pci/pcie/aspm.c
> >>>>>>>>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state)
> >>>>>>>>>>> PCI_L1SS_CTL1_L1SS_MASK, val);
> >>>>>>>>>>> }
> >>>>>>>>>>>
> >>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev)
> >>>>>>>>>>> +{
> >>>>>>>>>>> + int aspm_l1ss;
> >>>>>>>>>>> + struct pci_cap_saved_state *save_state;
> >>>>>>>>>>> + u32 *cap;
> >>>>>>>>>>> +
> >>>>>>>>>>> + if (!pci_is_pcie(dev))
> >>>>>>>>>>> + return;
> >>>>>>>>>>> +
> >>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS);
> >>>>>>>>>>> + if (!aspm_l1ss)
> >>>>>>>>>>> + return;
> >>>>>>>>>>> +
> >>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS);
> >>>>>>>>>>> + if (!save_state)
> >>>>>>>>>>> + return;
> >>>>>>>>>>> +
> >>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0];
> >>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++);
> >>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++);
> >>>>>>>>>>> +}
> >>>>>>>>>>> +
> >>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev)
> >>>>>>>>>>> +{
> >>>>>>>>>>> + int aspm_l1ss;
> >>>>>>>>>>> + struct pci_cap_saved_state *save_state;
> >>>>>>>>>>> + u32 *cap;
> >>>>>>>>>>> +
> >>>>>>>>>>> + if (!pci_is_pcie(dev))
> >>>>>>>>>>> + return;
> >>>>>>>>>>> +
> >>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS);
> >>>>>>>>>>> + if (!aspm_l1ss)
> >>>>>>>>>>> + return;
> >>>>>>>>>>> +
> >>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS);
> >>>>>>>>>>> + if (!save_state)
> >>>>>>>>>>> + return;
> >>>>>>>>>>> +
> >>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0];
> >>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++);
> >>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++);
> >>>>>>>>>>> +}
> >>>>>>>>>>> +
> >>>>>>>>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val)
> >>>>>>>>>>> {
> >>>>>>>>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL,
> >>>>>>>>>>> --
> >>>>>>>>>>> 2.17.1
> >>>>>>>>>>>
> >>>>>>>>
> >>>>>>>> Hi,
> >>>>>>>>
> >>>>>>>> With this patch (and also mentioned
> >>>>>>>> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@xxxxxxxxxxxxx/)
> >>>>>>>> applied on 5.10 (chromeos-5.10) I am observing problems after
> >>>>>>>> suspend/resume with my WiFi card - it looks like whole communication
> >>>>>>>> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume
> >>>>>>>> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3
> >>>>>>>>
> >>>>>>>> I played a little bit with this code and it looks like the
> >>>>>>>> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know
> >>>>>>>> why, not a PCI expert).
> >>>>>>>
> >>>>>>> Thanks a lot for testing this! I'm not quite sure what to make of the
> >>>>>>> results since v5.10 is fairly old (Dec 2020) and I don't know what
> >>>>>>> other changes are in chromeos-5.10.
> >>>>>
> >>>>> Lukasz: I assume you are running this on Atlas and are seeing this bug
> >>>>> when uprev'ving it to 5.10 kernel. Can you please try it on a newer
> >>>>> Intel platform that have the latest upstream kernel running already
> >>>>> and see if this can be reproduced there too?
> >>>>> Note that the wifi PCI device is different on newer Intel platforms,
> >>>>> but platform design is similar enough that I suspect we should see
> >>>>> similar bug on those too. The other option is to try the latest
> >>>>> ustream kernel on Atlas. Perhaps if we just care about wifi (and
> >>>>> ignore bringing up the graphics stack and GUI), it may come up
> >>>>> sufficiently enough to try this patch?
> >>>>>
> >>>>> Thanks,
> >>>>>
> >>>>> Rajat
> >>>>>
> >>>>>
> >>>>>>>
> >>>>>>> Random observations, no analysis below. This from your dmesg
> >>>>>>> certainly looks like PCI reads failing and returning ~0:
> >>>>>>>
> >>>>>>> Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff)
> >>>>>>> iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
> >>>>>>> iwlwifi 0000:01:00.0: Device gone - attempting removal
> >>>>>>> Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.
> >>>>>>>
> >>>>>>> And then we re-enumerate 01:00.0 and it looks like it may have been
> >>>>>>> reset (BAR is 0):
> >>>>>>>
> >>>>>>> pci 0000:01:00.0: [8086:095a] type 00 class 0x028000
> >>>>>>> pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit]
> >>>>>>>
> >>>>>>> lspci diffs from before/after suspend:
> >>>>>>>
> >>>>>>> 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode])
> >>>>>>> Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
> >>>>>>> - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend-
> >>>>>>> + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend-
> >>>>>>> - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+
> >>>>>>> + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+
> >>>>>>> - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1-
> >>>>>>> + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1-
> >>>>>>> - Capabilities: [150 v0] Null
> >>>>>>> - Capabilities: [200 v1] L1 PM Substates
> >>>>>>> - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+
> >>>>>>> - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us
> >>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+
> >>>>>>> - T_CommonMode=40us LTR1.2_Threshold=98304ns
> >>>>>>> - L1SubCtl2: T_PwrOn=60us
> >>>>>>>
> >>>>>>> The DevSta differences might be BIOS bugs, probably not relevant.
> >>>>>>> Interesting that ASPM is disabled, maybe didn't get enabled after
> >>>>>>> re-enumerating 01:00.0? Strange that the L1 PM Substates capability
> >>>>>>> disappeared.
> >>>>>>>
> >>>>>>> 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59)
> >>>>>>> LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+
> >>>>>>> - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
> >>>>>>> + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
> >>>>>>> Capabilities: [154 v1] L1 PM Substates
> >>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+
> >>>>>>> PortCommonModeRestoreTime=30us PortTPowerOnTime=60us
> >>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+
> >>>>>>> - T_CommonMode=0us LTR1.2_Threshold=98304ns
> >>>>>>> + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1-
> >>>>>>> + T_CommonMode=0us LTR1.2_Threshold=0ns
> >>>>>>>
> >>>>>>> Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't
> >>>>>>> get reinitialized after re-enumeration? Looks like we didn't restore
> >>>>>>> L1SubCtl1.
> >>>>>>>
> >>>>>>> Bjorn
> >>>>>>>
> >>>>
> >>>> Hi,
> >>>>
> >>>> Thank you all for the response and input! As Rajat mentioned I'm using
> >>>> chromebook - but not Atlas (Amberlake) - in this case it is Babymega
> >>>> (Apollolake) - I will try to load most recent kernel and give it a
> >>>> try once again.
> >>>>
> >>>> Best regards,
> >>>> Lukasz
> >>>
> >>> Hi,
> >>>
> >>> I have applied this patch on top of v5.19-rc7 (chromeos) and I'm
> >>> still getting same results:
> >>> https://gist.github.com/semihalf-majczak-lukasz/4b716704c21a3758d6711b2030ea34b9
> >>>
> >>> Best regards,
> >>> Lukasz
> >>>
> > Hi Vidya,
> >
> > Sorry for the long delay, I have retested your patch on top of
> > linux-next/master (next-20220802) - the results for my device remain
> > the same.
> > Here are the logs (lspci -vvv before suspend, lspci -vvv after resume and dmesg)
> > https://gist.github.com/semihalf-majczak-lukasz/c7bfd811359f23278034056a8002b3ef
> > Let me know if you need any more logs and/or tests.
> >
> > Best regards,
> > Lukasz
> >
Hi Vidya,

After your last email, I've re-tested my setup and (without your
patch) the capability register also disappears - so it looks there is
- in fact - some problem in my setup and your patch just brings it to
the top as after resume tries to write to a register that is no longer
present. I'm very sorry for the confusion here and I've not notice
that at the very beginning.

Best regards,
Lukasz

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