linux-kernel - Re: [Letux-kernel] [PATCH v16 1/4] drm/bridge: dw-hdmi: introduce dw_hdmi_enable

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Date:   Thu, 03 Mar 2022 17:20:51 +0000
From:   Paul Cercueil <paul@...pouillou.net>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        Paul Boddie <paul@...die.org.uk>,
        Daniel Vetter <daniel@...ll.ch>,
        Maxime Ripard <maxime@...no.tech>,
        Jonas Karlman <jonas@...boo.se>,
        David Airlie <airlied@...ux.ie>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-mips <linux-mips@...r.kernel.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Robert Foss <robert.foss@...aro.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>
Subject: Re: [Letux-kernel] [PATCH v16 1/4] drm/bridge: dw-hdmi: introduce
 dw_hdmi_enable_poll()

Hi Nikolaus,

[snip]

>>  Well he said "the Ingenic DRM core" aka ingenic-drm-drv.c. You do 
>> have access to the main drm_device in the ingenic_drm_bind() 
>> function, so you can add it there (with a cleanup function calling 
>> drm_kms_helper_poll_fini() registered with 
>> drmm_add_action_or_reset()).
> 
> Well, do you really want to mix HPD detection between connector, 
> Synopsys bridge and Ingenic DRM core? These are independent...
> Or should be accessed only through the bridge chain pointers.
> 
> IMHO we should keep separate functions separate.

The drm_kms_helper_poll_init() just says "this DRM device may have 
connectors that need to be polled" so it very well fits inside the main 
driver, IMHO.

-Paul

> 
> And maybe this should also be conditional? Maybe not depend on 
> compatible = jz4780 but compatible = ci20?
> 
> Looks to me to be a quick fix in the wrong place.
> 
> Let's fix the CSC issue first.
> 
> BR,
> Nikolaus
>