linux-kernel - Re: [PATCH] drm/msm: Initialize MDSS irq domain at probe time

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Date:   Sat, 27 Nov 2021 00:12:38 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, robdclark@...il.com
Cc:     sean@...rly.run, airlied@...ux.ie, daniel@...ll.ch,
        maxime@...no.tech, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com,
        konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        jami.kettunen@...ainline.org
Subject: Re: [PATCH] drm/msm: Initialize MDSS irq domain at probe time

On 26/11/2021 12:26, AngeloGioacchino Del Regno wrote:
> Il 26/11/21 01:06, Dmitry Baryshkov ha scritto:
>> On 25/11/2021 18:09, AngeloGioacchino Del Regno wrote:
>>> Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
>>> DSI host gets initialized earlier, but this caused unability to probe
>>> the entire stack of components because they all depend on interrupts
>>> coming from the main `mdss` node (mdp5, or dpu1).
>>>
>>> To fix this issue, also anticipate probing mdp5 or dpu1 by initializing
>>> them at msm_pdev_probe() time: this will make sure that we add the
>>> required interrupt controller mapping before dsi and/or other components
>>> try to initialize, finally satisfying the dependency.
>>>
>>> While at it, also change the allocation of msm_drm_private to use the
>>> devm variant of kzalloc().
>>>
>>> Fixes: 8f59ee9a570c ("drm/msm/dsi: Adjust probe order")
>>> Signed-off-by: AngeloGioacchino Del Regno 
>>> <angelogioacchino.delregno@...labora.com>
>>
>> Another issue (or a pack of issues):
>> Now the msm_drm_init() is unbalanced with msm_drm_uninit(). Bits of 
>> code (putting the drm dev, removing the IRQ domain, etc) have to be 
>> called now from the msm_pdev_remove() function rather than from the 
>> unbind path.
>>
>> The following changes fix the observed issues here, however additional 
>> care should be taken.
>>
> 
> 
> Hello Dmitry,
> 
> thanks for the thorough review (and solutions!).
> Are you going to push your changes on top, or should I send a V2?

Please send a v2. As you see, my suggestions have to be validated too 
(and they were based on crashes/issues observed locally).


-- 
With best wishes
Dmitry