From: Pin-yen Lin <treapking@chromium.org>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: "Andrzej Hajda" <andrzej.hajda@intel.com>,
"Neil Armstrong" <neil.armstrong@linaro.org>,
"Robert Foss" <rfoss@kernel.org>,
"Laurent Pinchart" <Laurent.pinchart@ideasonboard.com>,
"Jonas Karlman" <jonas@kwiboo.se>,
"Jernej Skrabec" <jernej.skrabec@gmail.com>,
"David Airlie" <airlied@gmail.com>,
"Daniel Vetter" <daniel@ffwll.ch>,
"Rob Herring" <robh+dt@kernel.org>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
"Daniel Scally" <djrscally@gmail.com>,
"Heikki Krogerus" <heikki.krogerus@linux.intel.com>,
"Sakari Ailus" <sakari.ailus@linux.intel.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Rafael J . Wysocki" <rafael@kernel.org>,
"Prashant Malani" <pmalani@chromium.org>,
"Benson Leung" <bleung@chromium.org>,
"Guenter Roeck" <groeck@chromium.org>,
"Xin Ji" <xji@analogixsemi.com>,
"Javier Martinez Canillas" <javierm@redhat.com>,
"Lyude Paul" <lyude@redhat.com>,
linux-kernel@vger.kernel.org,
"AngeloGioacchino Del Regno"
<angelogioacchino.delregno@collabora.com>,
chrome-platform@lists.linux.dev,
"Nícolas F . R . A . Prado" <nfraprado@collabora.com>,
"Marek Vasut" <marex@denx.de>,
"Hsin-Yi Wang" <hsinyi@chromium.org>,
devicetree@vger.kernel.org, "Allen Chen" <allen.chen@ite.com.tw>,
dri-devel@lists.freedesktop.org,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"Stephen Boyd" <swboyd@chromium.org>,
linux-acpi@vger.kernel.org,
"Alex Deucher" <alexander.deucher@amd.com>,
"Douglas Anderson" <dianders@chromium.org>,
"Imre Deak" <imre.deak@intel.com>,
"Jani Nikula" <jani.nikula@intel.com>,
"Ville Syrjälä" <ville.syrjala@linux.intel.com>
Subject: Re: [PATCH v13 03/10] drm/display: Add Type-C switch helpers
Date: Wed, 8 Mar 2023 18:20:14 +0800 [thread overview]
Message-ID: <CAEXTbpf4zM+70BCef6rdfz35TQnQ+ozaXAvOaEZVnqqe6MDOOg@mail.gmail.com> (raw)
In-Reply-To: <ZAXTVCAQpHvSj+6C@smile.fi.intel.com>
Hi Andy,
Thanks for the review.
On Mon, Mar 6, 2023 at 7:49 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
>
> On Fri, Mar 03, 2023 at 10:33:43PM +0800, Pin-yen Lin wrote:
> > Add helpers to register and unregister Type-C "switches" for bridges
> > capable of switching their output between two downstream devices.
> >
> > The helper registers USB Type-C mode switches when the "mode-switch"
> > and the "reg" properties are available in Device Tree.
>
> ...
>
> > + port_data->typec_mux = typec_mux_register(dev, &mux_desc);
> > + if (IS_ERR(port_data->typec_mux)) {
> > + ret = PTR_ERR(port_data->typec_mux);
> > + dev_err(dev, "Mode switch register for port %d failed: %d\n",
> > + port_num, ret);
>
> > + return ret;
> > + }
> > +
> > + return 0;
>
> Can be simply
>
> port_data->typec_mux = typec_mux_register(dev, &mux_desc);
> ret = PTR_ERR_OR_ZERO(port_data->typec_mux);
> if (ret)
> dev_err(dev, "Mode switch register for port %d failed: %d\n",
> port_num, ret);
>
> return ret;
>
This was suggested by Angelo in [1], but you are not the first
reviewer that finds this weird... I'll update this in the next
version.
[1]: https://lore.kernel.org/all/023519eb-0adb-3b08-71b9-afb92a6cceaf@collabora.com/
> ...
>
> > + switch_desc->typec_ports = devm_kcalloc(dev, switch_desc->num_typec_switches,
> > + sizeof(struct drm_dp_typec_port_data),
> > + GFP_KERNEL);
> > + if (!switch_desc->typec_ports)
> > + return -ENOMEM;
>
> How often this function _can_ be called during the runtime?
> If it's _possible_ to call it infinite times, consider *not* using devm.
I would expect this function to be only called during driver probing,
and this is the case for the current users in this series. So I think
this is only called once if EPROBDE_DEFER doesn't count.
>
> --
> With Best Regards,
> Andy Shevchenko
>
>
Best regards,
Pin-yen
next prev parent reply other threads:[~2023-03-08 10:20 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-03 14:33 [PATCH v13 00/10] Register Type-C mode-switch in DP bridge endpoints Pin-yen Lin
2023-03-03 14:33 ` [PATCH v13 01/10] device property: Add remote endpoint to devcon matcher Pin-yen Lin
2023-03-06 11:43 ` Andy Shevchenko
2023-03-06 11:54 ` Sakari Ailus
2023-03-08 7:30 ` Heikki Krogerus
2023-03-03 14:33 ` [PATCH v13 02/10] platform/chrome: cros_ec_typec: Purge blocking switch devlinks Pin-yen Lin
2023-03-03 14:33 ` [PATCH v13 03/10] drm/display: Add Type-C switch helpers Pin-yen Lin
2023-03-06 11:49 ` Andy Shevchenko
2023-03-08 10:20 ` Pin-yen Lin [this message]
2023-03-08 15:28 ` Andy Shevchenko
2023-03-09 10:20 ` Pin-yen Lin
2023-03-03 14:33 ` [PATCH v13 04/10] dt-bindings: display: bridge: anx7625: Add mode-switch support Pin-yen Lin
2023-03-03 14:33 ` [PATCH v13 05/10] drm/bridge: anx7625: Check for Type-C during panel registration Pin-yen Lin
2023-03-06 11:51 ` Andy Shevchenko
2023-03-08 10:25 ` Pin-yen Lin
2023-03-03 14:33 ` [PATCH v13 06/10] drm/bridge: Remove redundant i2c_client in anx7625/it6505 Pin-yen Lin
2023-03-03 14:33 ` [PATCH v13 07/10] drm/bridge: anx7625: Register Type C mode switches Pin-yen Lin
2023-03-06 11:55 ` Andy Shevchenko
2023-03-08 13:44 ` Pin-yen Lin
2023-03-03 14:33 ` [PATCH v13 08/10] dt-bindings: display: bridge: it6505: Add mode-switch support Pin-yen Lin
2023-03-03 14:33 ` [PATCH v13 09/10] drm/bridge: it6505: Fix Kconfig indentation Pin-yen Lin
2023-03-03 14:33 ` [PATCH v13 10/10] drm/bridge: it6505: Register Type C mode switches Pin-yen Lin
2023-03-06 12:02 ` Andy Shevchenko
2023-03-08 13:51 ` Pin-yen Lin
2023-03-08 15:31 ` Andy Shevchenko
2023-03-09 10:21 ` Pin-yen Lin
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