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Subject: Re: [RESEND PATCH v4 0/7] Convert mtk-dsi to drm_bridge API and get
 EDID for ps8640 bridge
To:     Sam Ravnborg <sam@ravnborg.org>
Cc:     linux-kernel@vger.kernel.org,
        Collabora Kernel ML <kernel@collabora.com>,
        Chun-Kuang Hu <chunkuang.hu@kernel.org>,
        Jernej Skrabec <jernej.skrabec@siol.net>,
        drinkcat@chromium.org, Jonas Karlman <jonas@kwiboo.se>,
        David Airlie <airlied@linux.ie>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        dri-devel@lists.freedesktop.org,
        Neil Armstrong <narmstrong@baylibre.com>,
        Andrzej Hajda <a.hajda@samsung.com>,
        linux-mediatek@lists.infradead.org,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        hsinyi@chromium.org, matthias.bgg@gmail.com,
        linux-arm-kernel@lists.infradead.org
References: <20200615203108.786083-1-enric.balletbo@collabora.com>
 <20200620213302.GC74146@ravnborg.org>
From:   Enric Balletbo i Serra <enric.balletbo@collabora.com>
Message-ID: <593a4666-d6aa-7d16-f3a0-ba3713047d84@collabora.com>
Date:   Tue, 30 Jun 2020 16:33:56 +0200
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Hi Sam, Chun-Kuan,

On 20/6/20 23:33, Sam Ravnborg wrote:
> Hi Enric
> 
> On Mon, Jun 15, 2020 at 10:31:01PM +0200, Enric Balletbo i Serra wrote:
>> (This resend is to fix some trivial conflicts due the merge window)
>>
>> The PS8640 dsi-to-eDP bridge driver is using the panel bridge API,
>> however, not all the components in the chain have been ported to the
>> drm_bridge API. Actually, when a panel is attached the default panel's mode
>> is used, but in some cases we can't get display up if mode getting from
>> eDP control EDID is not chosen.
>>
>> This series address that problem, first implements the .get_edid()
>> callback in the PS8640 driver (which is not used until the conversion is
>> done) and then, converts the Mediatek DSI driver to use the drm_bridge
>> API.
>>
>> As far as I know, we're the only users of the mediatek dsi driver in
>> mainline, so should be safe to switch to the new chain of drm_bridge API
>> unconditionally.
>>
>> The patches has been tested on a Acer Chromebook R13 (Elm) running a
>> Chrome OS userspace and checking that the valid EDID mode reported by
>> the bridge is selected.
>>
>> Changes in v4:
>> - Remove double call to drm_encoder_init(). (Chun-Kuang Hu)
>> - Cleanup the encoder in mtk_dsi_unbind(). (Chun-Kuang Hu)
>>
>> Changes in v3:
>> - Replace s/bridge/next bridge/ for comment. (Laurent Pinchart)
>> - Add the bridge.type. (Laurent Pinchart)
>> - Use next_bridge field to store the panel bridge. (Laurent Pinchart)
>> - Add the bridge.type field. (Laurent Pinchart)
>> - This patch requires https://lkml.org/lkml/2020/4/16/2080 to work
>>   properly.
>> - Move the bridge.type line to the patch that adds drm_bridge support. (Laurent Pinchart)
>>
>> Changes in v2:
>> - Do not set connector_type for panel here. (Sam Ravnborg)
>>
>> Enric Balletbo i Serra (7):
>>   drm/bridge: ps8640: Get the EDID from eDP control
>>   drm/bridge_connector: Set default status connected for eDP connectors
>>   drm/mediatek: mtk_dsi: Rename bridge to next_bridge
>>   drm/mediatek: mtk_dsi: Convert to bridge driver
>>   drm/mediatek: mtk_dsi: Use simple encoder
>>   drm/mediatek: mtk_dsi: Use the drm_panel_bridge API
>>   drm/mediatek: mtk_dsi: Create connector for bridges
> 
> Patch seems ready to apply. Will they be applied to a mediatek tree
> or to drm-misc-next?
> Or shall we take the first two patches via drm-misc-next, and the
> remaning via a mediatek tree? (I hope not)
> 

I think the only concern is from Chun-Kuan regarding patch 7/7 "drm/mediatek:
mtk_dsi: Create connector for bridges" whether we should support the old API or
not, but the discussion stalled.

Thanks,
 Enric


> 	Sam
> 
> 
>>
>>  drivers/gpu/drm/bridge/parade-ps8640.c |  12 ++
>>  drivers/gpu/drm/drm_bridge_connector.c |   1 +
>>  drivers/gpu/drm/mediatek/mtk_dsi.c     | 269 ++++++++-----------------
>>  3 files changed, 97 insertions(+), 185 deletions(-)
>>
>> -- 
>> 2.27.0
>>
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>