linux-kernel - Re: [PATCH v7 0/7] incorporate pm runtime framework and eDP clean up

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Message-ID: <748da144-af4c-5a2a-e82b-3a870995cbce@quicinc.com>
Date:   Thu, 9 Nov 2023 09:51:18 -0800
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC:     <dri-devel@...ts.freedesktop.org>, <robdclark@...il.com>,
        <sean@...rly.run>, <swboyd@...omium.org>, <dianders@...omium.org>,
        <vkoul@...nel.org>, <daniel@...ll.ch>, <airlied@...il.com>,
        <agross@...nel.org>, <andersson@...nel.org>,
        <quic_jesszhan@...cinc.com>, <quic_sbillaka@...cinc.com>,
        <marijn.suijten@...ainline.org>, <freedreno@...ts.freedesktop.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 0/7] incorporate pm runtime framework and eDP clean up


On 11/8/2023 10:27 AM, Abhinav Kumar wrote:
>
>
> On 11/8/2023 10:10 AM, Kuogee Hsieh wrote:
>>
>> On 11/7/2023 1:23 PM, Dmitry Baryshkov wrote:
>>> On Tue, 7 Nov 2023 at 23:01, Kuogee Hsieh <quic_khsieh@...cinc.com> 
>>> wrote:
>>>>
>>>> On 11/6/2023 5:55 PM, Dmitry Baryshkov wrote:
>>>>> On Sat, 7 Oct 2023 at 01:55, Kuogee Hsieh 
>>>>> <quic_khsieh@...cinc.com> wrote:
>>>>>> The purpose of this patch series is to incorporate pm runtime 
>>>>>> framework
>>>>>> into MSM eDP/DP driver so that eDP panel can be detected by DRM 
>>>>>> eDP panel
>>>>>> driver during system probe time. During incorporating procedure, 
>>>>>> original
>>>>>> customized pm realted fucntions, such as dp_pm_prepare(), 
>>>>>> dp_pm_suspend(),
>>>>>> dp_pm_resume() and dp_pm_prepare(), are removed and replaced with 
>>>>>> functions
>>>>>> provided by pm runtiem framework such as 
>>>>>> pm_runtime_force_suspend() and
>>>>>> pm_runtime_force_resume(). In addition, both eDP aux-bus and irq 
>>>>>> handler
>>>>>> are bound at system probe time too.
>>>>> With this patchset in place I can crash the board using the following
>>>>> sequence (SM8350-HDK):
>>>>>
>>>>> - plug the USBC DP dongle
>>>>> - run modetest at any mode, don't press Enter yet
>>>>> - unplug the dongle
>>>>> - press Enter to stop modetest
>>>>>
>>>>> => the board resets to Sahara.
>>>>>
>>>>> Please ping me if you need any additional information from my side.
>>>> questiosn,
>>>>
>>>> 1) which dongle are you used?
>>> I have used several Dell and Hama USB-C dongles.
>>>
>>>> 2) what code branch shoud I used to duplicate this problem.
>>> I have pushed my kernel tree to
>>> git.codelinaro.org/dmitry.baryshkov/linux.git, branch test-dp-rpm
>>> I had several UCSI patches on top, but they should not be relevant.
>> git.codelinaro.org/dmitry.baryshkov/linux.git, branch test-dp-rpm <== 
>> I synced out his branch and it is still work at my chromebook Kodiak 
>> DUT.
>>>
>
> Perhaps the gap in test results with the same tree is due to internal 
> hpd vs hpd pin. We need to try this on a device which does not use 
> internal hpd.


Hi Dmitry,

I have two more questions,

1) are you see test pattern shows at external DP when you run modetest?
2) is *.kcrash file created under /var/spool/crash/ when system crashed. 
If it is, can you share it?

Thanks,

>
>>>> I can not duplicate  system crash problem at my setup kodiak (SM7325)
>>>> chrome book with my PM runtime patch series.
>>>>
>>>> my code base is Linux 6.6-rc2 + pm runtime patch series (7 patches)
>>>>
>>>> I did:
>>>>
>>>> 1) plugin either apple dongle (DP-to-HDMI) + 1080p display or DP typeC
>>>> cable directly to 1080p display
>>>>
>>>> 2)  stop ui
>>>>
>>>> 3) /usr/bin/modetest -M msm -s 34:1920x1080 (see test pattern show at
>>>> display)
>>>>
>>>> 4) unplug apple dongle or DP typeC cable
>>>>
>>>> 5) hit enter key
>>>>
>>>> 6) start ui
>>>>
>>>> 7) display back to login page of chrome book
>>>>
>>>>
>>>