linux-kernel - Re: [PATCH v2] drm/msm/dp: check core_initialized before disable interrupts at dp_display

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Date:   Fri, 10 Jun 2022 14:12:31 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>, agross@...nel.org,
        airlied@...ux.ie, bjorn.andersson@...aro.org, daniel@...ll.ch,
        dianders@...omium.org, dmitry.baryshkov@...aro.org,
        robdclark@...il.com, sean@...rly.run, vkoul@...nel.org
Cc:     quic_abhinavk@...cinc.com, quic_aravindh@...cinc.com,
        quic_sbillaka@...cinc.com, freedreno@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/msm/dp: check core_initialized before disable
 interrupts at dp_display_unbind()

Quoting Kuogee Hsieh (2022-06-06 10:55:39)
> During msm initialize phase, dp_display_unbind() will be called to undo
> initializations had been done by dp_display_bind() previously if there is
> error happen at msm_drm_bind. In this case, core_initialized flag had to
> be check to make sure clocks is on before update DP controller register
> to disable HPD interrupts. Otherwise system will crash due to below NOC
> fatal error.
>
> QTISECLIB [01f01a7ad]CNOC2 ERROR: ERRLOG0_LOW = 0x00061007
> QTISECLIB [01f01a7ad]GEM_NOC ERROR: ERRLOG0_LOW = 0x00001007
> QTISECLIB [01f0371a0]CNOC2 ERROR: ERRLOG0_HIGH = 0x00000003
> QTISECLIB [01f055297]GEM_NOC ERROR: ERRLOG0_HIGH = 0x00000003
> QTISECLIB [01f072beb]CNOC2 ERROR: ERRLOG1_LOW = 0x00000024
> QTISECLIB [01f0914b8]GEM_NOC ERROR: ERRLOG1_LOW = 0x00000042
> QTISECLIB [01f0ae639]CNOC2 ERROR: ERRLOG1_HIGH = 0x00004002
> QTISECLIB [01f0cc73f]GEM_NOC ERROR: ERRLOG1_HIGH = 0x00004002
> QTISECLIB [01f0ea092]CNOC2 ERROR: ERRLOG2_LOW = 0x0009020c
> QTISECLIB [01f10895f]GEM_NOC ERROR: ERRLOG2_LOW = 0x0ae9020c
> QTISECLIB [01f125ae1]CNOC2 ERROR: ERRLOG2_HIGH = 0x00000000
> QTISECLIB [01f143be7]GEM_NOC ERROR: ERRLOG2_HIGH = 0x00000000
> QTISECLIB [01f16153a]CNOC2 ERROR: ERRLOG3_LOW = 0x00000000
> QTISECLIB [01f17fe07]GEM_NOC ERROR: ERRLOG3_LOW = 0x00000000
> QTISECLIB [01f19cf89]CNOC2 ERROR: ERRLOG3_HIGH = 0x00000000
> QTISECLIB [01f1bb08e]GEM_NOC ERROR: ERRLOG3_HIGH = 0x00000000
> QTISECLIB [01f1d8a31]CNOC2 ERROR: SBM1 FAULTINSTATUS0_LOW = 0x00000002
> QTISECLIB [01f1f72a4]GEM_NOC ERROR: SBM0 FAULTINSTATUS0_LOW = 0x00000001
> QTISECLIB [01f21a217]CNOC3 ERROR: ERRLOG0_LOW = 0x00000006
> QTISECLIB [01f23dfd3]NOC error fatal

Don't think this pile of lines really helps anyone, but OK.

>
> changes in v2:
> -- drop the first patch (drm/msm: enable msm irq after all initializations are done successfully at msm_drm_init()) since the problem had been fixed by other patch
>
> Fixes: a65c95ff88f2 ("drm/msm/dp: stop event kernel thread when DP unbind")
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>