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

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Date:   Thu, 16 Jun 2022 09:03:05 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>, robdclark@...il.com,
        sean@...rly.run, swboyd@...omium.org, dianders@...omium.org,
        vkoul@...nel.org, daniel@...ll.ch, airlied@...ux.ie,
        agross@...nel.org, bjorn.andersson@...aro.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()

On 06/06/2022 20:55, Kuogee Hsieh wrote:
> 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
> 
> 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")

Please. Stop using commit IDs from the private git tree.  I thought we 
have stumbled upon this during the last cycle, thus we won't see rogue 
commit IDs anymore. But I was wrong. I've got another complaint from 
Stephen. I'm going to fix this one manually, but please make sure to 
stop sending wrong Fixes tags in the future.

Generally I feel like this is a sign of an incorrect process on your 
side. The patches should be developed and tested against one of upstream 
trees (linux-next, msm-next or msm-next-lumag) and then backported to 
your integration/backports/stable/whatever. Since today the 
msm-next-lumag is included into the linux-next, so you can use 
linux-next as a basis.


> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> ---
>   drivers/gpu/drm/msm/dp/dp_display.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index da5c03a..2b72639 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -309,7 +309,8 @@ static void dp_display_unbind(struct device *dev, struct device *master,
>   	struct msm_drm_private *priv = dev_get_drvdata(master);
>   
>   	/* disable all HPD interrupts */
> -	dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
> +	if (dp->core_initialized)
> +		dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
>   
>   	kthread_stop(dp->ev_tsk);
>   


-- 
With best wishes
Dmitry