linux-kernel - Re: [PATCH v13 07/10] drm/bridge: anx7625: Register Type C mode switches

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Date:   Wed, 8 Mar 2023 21:44:58 +0800
From:   Pin-yen Lin <treapking@...omium.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
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>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Lyude Paul <lyude@...hat.com>, linux-kernel@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        chrome-platform@...ts.linux.dev,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>, Marek Vasut <marex@...x.de>,
        Hsin-Yi Wang <hsinyi@...omium.org>, devicetree@...r.kernel.org,
        Allen Chen <allen.chen@....com.tw>,
        dri-devel@...ts.freedesktop.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Stephen Boyd <swboyd@...omium.org>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v13 07/10] drm/bridge: anx7625: Register Type C mode switches

Hi Andy,

Thanks for the review.

On Mon, Mar 6, 2023 at 7:55 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Fri, Mar 03, 2023 at 10:33:47PM +0800, Pin-yen Lin wrote:
> > Register USB Type-C mode switches when the "mode-switch" property and
> > relevant ports are available in Device Tree. Configure the crosspoint
> > switch based on the entered alternate mode for a specific Type-C
> > connector.
> >
> > Crosspoint switch can also be used for switching the output signal for
> > different orientations of a single USB Type-C connector, but the
> > orientation switch is not implemented yet. A TODO is added for this.
>
> ...
>
> > +     ctx->port_data = devm_kcalloc(
> > +             dev, switch_desc->num_typec_switches,
> > +             sizeof(struct anx7625_typec_port_data), GFP_KERNEL);
>
> I believe I have commented on this (indentation)...
>
> > +
>
> ...and this (blank line).

Sorry for missing this one. I'll fix this in v14.
>
> > +     if (!ctx->port_data) {
> > +             ret = -ENOMEM;
> > +             goto unregister_mux;
> > +     }
>
> ...
>
> > +             ctx->port_data[i].orientation = (dp_lanes[0] / 2 == 0) ?
> > +                     TYPEC_ORIENTATION_REVERSE : TYPEC_ORIENTATION_NORMAL;
>
> I believe that this is an error prone check, you should rather do the opposite,
> i.e.  ' % 2  == 0'.
>
The orientation should be TYPEC_ORIENTATION_REVERSE when the
data-lanes value is 0/1, so ` / 2` is what I meant here.

Though, after second thought, I think it would be clearer if I use
`dp_lanes[0] < 2`. I'll update this in v14 as well.
> --
> With Best Regards,
> Andy Shevchenko
>
>
Best regards,
Pin-yen