linux-kernel - Re: [v5, PATCH] drm/mediatek: add dma buffer control for drm plane disable

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Date:   Wed, 5 Jul 2023 09:48:07 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Yongqiang Niu <yongqiang.niu@...iatek.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        CK Hu <ck.hu@...iatek.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linaro-mm-sig@...ts.linaro.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Hsin-Yi Wang <hsinyi@...omium.org>
Subject: Re: [v5, PATCH] drm/mediatek: add dma buffer control for drm plane
 disable

Hi,

On Wed, Jul 05, 2023 at 02:07:18PM +0800, Yongqiang Niu wrote:
> dma buffer release before overlay disable, that will cause
> m4u translation fault warning.
> 
> add dma buffer control flow in mediatek driver:
> get dma buffer when drm plane disable
> put dma buffer when overlay really disable
> 
> Fixes: 41016fe1028e ("drm: Rename plane->state variables in atomic update and disable")
> Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>

I think we need more details in the commit message about what the issue
is exactly and how it's fixed.

This definitely feels like it's not something drivers should have to do.

Maxime

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