linux-kernel - Re: [PATCH v10] drm/bridge: add it6505 driver

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Date:   Wed, 5 Jan 2022 11:45:00 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     allen <allen.chen@....com.tw>
Cc:     Hsin-Yi Wang <hsinyi@...gle.com>,
        Jau-Chih Tseng <Jau-Chih.Tseng@....com.tw>,
        Kenneth Hung <Kenneth.Hung@....com.tw>,
        Hermes Wu <Hermes.Wu@....com.tw>,
        Hsin-yi Wang <hsinyi@...omium.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v10] drm/bridge: add it6505 driver

Il 14/10/21 05:30, allen ha scritto:
> This adds support for the iTE IT6505.
> This device can convert DPI signal to DP output.
> 
> From: Allen Chen <allen.chen@....com.tw>
> Tested-by: Hsin-yi Wang <hsinyi@...omium.org>
> Signed-off-by: Hermes Wu <hermes.wu@....com.tw>
> Signed-off-by: Allen Chen <allen.chen@....com.tw>
> ---
> This patch depends on https://patchwork.kernel.org/project/linux-mediatek/patch/20210722062246.2512666-4-sam@ravnborg.org/
> ---
>   drivers/gpu/drm/bridge/Kconfig      |    8 +
>   drivers/gpu/drm/bridge/Makefile     |    1 +
>   drivers/gpu/drm/bridge/ite-it6505.c | 3335 +++++++++++++++++++++++++++
>   3 files changed, 3344 insertions(+)
>   create mode 100644 drivers/gpu/drm/bridge/ite-it6505.c

Hello Allen,

since the dependency that you mentioned seems to be requiring some time to get
merged in, can you please open-code the call to drm_bridge_new_crtc_state() as
to stop requiring the commit you pointed to?

We can perhaps update this driver later, whenever the series you mentioned will
get applied.

The reason for this request is due to a breakage on MT8183 Kukui: since DPI is
supported in the drm-mediatek driver for this SoC, on platforms that are using
a DSI<->DP/eDP bridge, a probe failure occurs for the DPI0 component.
Leaving apart that drm-mediatek should be fixed to account for this as a non
critical error (and keep going with DSI only, simply ignoring DPI0), the Kukui
family of devices do have this functionality and it should be brought up as
soon as possible at this point - especially since the driver that you've sent
is ok to have.

Looking forward to see a v11 without unsatisfiable dependencies!

Thank you.

Regards,
- Angelo