linux-kernel - Re: [PATCH v3] gpu/drm: mediatek: call mtk_dsi_stop() after mtk_drm_crtc_atomic

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Message-ID: <CAJMQK-ir9J-JN9DDZPBA1nVkJUZ_6A+fY4fA6jx6zOh_9q5a-w@mail.gmail.com>
Date:   Thu, 30 May 2019 10:55:12 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     CK Hu <ck.hu@...iatek.com>
Cc:     "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        lkml <linux-kernel@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-mediatek@...ts.infradead.org, Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v3] gpu/drm: mediatek: call mtk_dsi_stop() after mtk_drm_crtc_atomic_disable()

On Tue, May 28, 2019 at 4:53 PM CK Hu <ck.hu@...iatek.com> wrote:

> I think we've already discussed in [1]. I need a reason to understand
> this is hardware behavior or software bug. If this is a software bug, we
> need to fix the bug and code could be symmetric.
>
> [1]
> http://lists.infradead.org/pipermail/linux-mediatek/2019-March/018423.html
>
Hi CK,

Jitao has replied in v2[1]
"
mtk_dsi_start must after dsi full setting.
If you put it in mtk_dsi_ddp_start, mtk_dsi_set_mode won't work. DSI
will keep cmd mode. So you see no irq.
...
"

[1] https://lore.kernel.org/patchwork/patch/1052505/#1276270

Thanks