linux-kernel - Re: [PATCH v3 15/17] platform/chrome: cros_ec_typec: Add support for signaling DP HPD via drm

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Message-ID: <CAE-0n50MVaU2dmRLdLVFWT9KWPO_BK-L7eEqGRSb8TKm1KtPNQ@mail.gmail.com>
Date: Fri, 23 Aug 2024 13:47:23 -0700
From: Stephen Boyd <swboyd@...omium.org>
To: Tzung-Bi Shih <tzungbi@...nel.org>
Cc: chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	patches@...ts.linux.dev, devicetree@...r.kernel.org, 
	Douglas Anderson <dianders@...omium.org>, Pin-yen Lin <treapking@...omium.org>, 
	Andrzej Hajda <andrzej.hajda@...el.com>, Benson Leung <bleung@...omium.org>, 
	Conor Dooley <conor+dt@...nel.org>, Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...il.com>, 
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, dri-devel@...ts.freedesktop.org, 
	Guenter Roeck <groeck@...omium.org>, Jernej Skrabec <jernej.skrabec@...il.com>, 
	Jonas Karlman <jonas@...boo.se>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Lee Jones <lee@...nel.org>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Prashant Malani <pmalani@...omium.org>, 
	Robert Foss <rfoss@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, Alexandre Belloni <alexandre.belloni@...tlin.com>, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Daniel Scally <djrscally@...il.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>, Ivan Orlov <ivan.orlov0322@...il.com>, 
	linux-acpi@...r.kernel.org, linux-usb@...r.kernel.org, 
	Mika Westerberg <mika.westerberg@...ux.intel.com>, 
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>, Sakari Ailus <sakari.ailus@...ux.intel.com>, 
	Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH v3 15/17] platform/chrome: cros_ec_typec: Add support for
 signaling DP HPD via drm_bridge

Quoting Tzung-Bi Shih (2024-08-22 07:35:13)
> On Mon, Aug 19, 2024 at 03:38:29PM -0700, Stephen Boyd wrote:
> > +struct cros_typec_dp_bridge {
> > +     struct cros_typec_data *typec_data;
> > +     struct drm_dp_typec_bridge_dev *dev;
> > +};
>
> It looks like structs are all defined in cros_ec_typec.h.  I think this struct
> definition can be also moved there.

I put it here because it wasn't used by any other driver. Maybe I can
skip the entire struct though and add what I need directly to 'struct
cros_typec_data'.

>
> > diff --git a/drivers/platform/chrome/cros_ec_typec.h b/drivers/platform/chrome/cros_ec_typec.h
> > index deda180a646f..73d300427140 100644
> > --- a/drivers/platform/chrome/cros_ec_typec.h
> > +++ b/drivers/platform/chrome/cros_ec_typec.h
> > @@ -27,6 +27,8 @@ struct cros_typec_altmode_node {
> >       struct list_head list;
> >  };
> >
> > +struct cros_typec_dp_bridge;
>
> If the struct definition moves here, it doesn't need to declare forward.

But then we have to forward declare 'struct cros_typec_data'? There's no
escape.