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

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Date:   Fri, 26 Nov 2021 10:26:15 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 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

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?

Cheers,
- Angelo