linux-kernel - Re: [PATCH] drm/sun4i: dw-hdmi: Fix ddc-en GPIO consumer conflict

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Date:   Tue, 14 Jun 2022 17:45:55 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>
Cc:     Samuel Holland <samuel@...lland.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        "H. Nikolaus Schaller" <hns@...delico.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Paul Cercueil <paul@...pouillou.net>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH] drm/sun4i: dw-hdmi: Fix ddc-en GPIO consumer conflict

Dne torek, 14. junij 2022 ob 09:31:00 CEST je Samuel Holland napisal(a):
> commit 6de79dd3a920 ("drm/bridge: display-connector: add ddc-en gpio
> support") added a consumer for this GPIO in the HDMI connector device.
> This new consumer conflicts with the pre-existing GPIO consumer in the
> sun8i HDMI controller driver, which prevents the driver from probing:
> 
>   [    4.983358] display-connector connector: GPIO lookup for consumer ddc-
en
>   [    4.983364] display-connector connector: using device tree for GPIO 
lookup
>   [    4.983392] gpio-226 (ddc-en): gpiod_request: status -16
>   [    4.983399] sun8i-dw-hdmi 6000000.hdmi: Couldn't get ddc-en gpio
>   [    4.983618] sun4i-drm display-engine: failed to bind 6000000.hdmi (ops 
sun8i_dw_hdmi_ops [sun8i_drm_hdmi]): -16
>   [    4.984082] sun4i-drm display-engine: Couldn't bind all pipelines 
components
>   [    4.984171] sun4i-drm display-engine: adev bind failed: -16
>   [    4.984179] sun8i-dw-hdmi: probe of 6000000.hdmi failed with error -16
> 
> Both drivers have the same behavior: they leave the GPIO active for the
> life of the device. Let's take advantage of the new implementation, and
> drop the now-obsolete code from the HDMI controller driver.
> 
> Fixes: 6de79dd3a920 ("drm/bridge: display-connector: add ddc-en gpio 
support")
> Signed-off-by: Samuel Holland <samuel@...lland.org>

Reviewed-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej