linux-kernel - Re: [PATCH 1/3] drm: mediatek: fix unbind functions

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Message-ID: <CAJMQK-jDhDNViUA3dpixG=_Pe7x0qH4utBWy3k+D_+oKwEOPig@mail.gmail.com>
Date:   Wed, 29 May 2019 15:06:27 +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>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] drm: mediatek: fix unbind functions

On Wed, May 29, 2019 at 9:35 AM CK Hu <ck.hu@...iatek.com> wrote:

>
> I think mtk_dsi_destroy_conn_enc() has much thing to do and I would like
> you to do more. You could refer to [2] for complete implementation.
>
> [2]
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/exynos/exynos_drm_dsi.c?h=v5.2-rc2#n1575
>
Hi CK,

Since drm_encoder_cleanup() would already call drm_bridge_detach() to
detach bridge, I think we only need to handle panel case here.
We don't need to call mtk_dsi_encoder_disable() since
mtk_output_dsi_disable() is called in mtk_dsi_remove() and
dsi->enabled will be set to false. Calling second time will just
returns immediately.
So, besides setting

dsi->panel = NULL;
dsi->conn.status = connector_status_disconnected;

are there other things we need to do here?

Original code doesn't have drm_kms_helper_hotplug_event(), and I'm not
sure if mtk dsi would need this.
Also, mtk_dsi_stop() would also stop irq.

Thanks