linux-kernel - Re: [PATCH v14 03/10] drm/display: Add Type-C switch helpers

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Message-ID: <87edpg7nub.fsf@intel.com>
Date:   Wed, 22 Mar 2023 18:27:56 +0200
From:   Jani Nikula <jani.nikula@...el.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Pin-yen Lin <treapking@...omium.org>
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Xin Ji <xji@...logixsemi.com>, linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        linux-acpi@...r.kernel.org,
        Javier Martinez Canillas <javierm@...hat.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Lyude Paul <lyude@...hat.com>,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>, Allen Chen <allen.chen@....com.tw>,
        dri-devel@...ts.freedesktop.org, Marek Vasut <marex@...x.de>,
        Stephen Boyd <swboyd@...omium.org>,
        chrome-platform@...ts.linux.dev, devicetree@...r.kernel.org,
        Andi Shyti <andi.shyti@...ux.intel.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        Imre Deak <imre.deak@...el.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: Re: [PATCH v14 03/10] drm/display: Add Type-C switch helpers

On Wed, 22 Mar 2023, Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
> On Wed, Mar 22, 2023 at 06:46:32PM +0800, Pin-yen Lin wrote:
>> +#ifdef CONFIG_DRM_DISPLAY_DP_TYPEC_HELPER
>
> Ah, maybe this should use IS_REACHABLE() ?

Personally, I think IS_REACHABLE() is a build-time band-aid solution to
a problem that should be solved in Kconfig. :p

I think it always means there's a configuration combo that shouldn't
exist, and it's a surprise to the user when they've configured
something, Kconfig has deemed it a valid configuration, but they don't
get the feature they want.

As a user, how would they even debug that case? Double check configs,
don't see anything wrong.


BR,
Jani.


-- 
Jani Nikula, Intel Open Source Graphics Center