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Date: Tue, 7 Feb 2023 22:25:34 +0100
From: Andi Shyti <andi.shyti@...ux.intel.com>
To: Pin-yen Lin <treapking@...omium.org>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Robert Foss <robert.foss@...aro.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>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
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>,
linux-kernel@...r.kernel.org,
Nícolas F . R . A . Prado
<nfraprado@...labora.com>, Hsin-Yi Wang <hsinyi@...omium.org>,
devicetree@...r.kernel.org, Allen Chen <allen.chen@....com.tw>,
Lyude Paul <lyude@...hat.com>, linux-acpi@...r.kernel.org,
dri-devel@...ts.freedesktop.org, Marek Vasut <marex@...x.de>,
Xin Ji <xji@...logixsemi.com>,
Stephen Boyd <swboyd@...omium.org>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Thomas Zimmermann <tzimmermann@...e.de>,
Javier Martinez Canillas <javierm@...hat.com>,
chrome-platform@...ts.linux.dev,
Alex Deucher <alexander.deucher@....com>,
Andi Shyti <andi.shyti@...ux.intel.com>,
Douglas Anderson <dianders@...omium.org>,
"Gustavo A. R. Silva" <gustavoars@...nel.org>,
Imre Deak <imre.deak@...el.com>,
Jani Nikula <jani.nikula@...el.com>,
Kees Cook <keescook@...omium.org>,
Thierry Reding <treding@...dia.com>
Subject: Re: [PATCH v11 3/9] drm/display: Add Type-C switch helpers
Hi Pin-yen,
[...]
> +static int drm_dp_register_mode_switch(struct device *dev,
> + struct fwnode_handle *fwnode,
> + struct drm_dp_typec_switch_desc *switch_desc,
> + void *data, typec_mux_set_fn_t mux_set)
> +{
> + struct drm_dp_typec_port_data *port_data;
> + struct typec_mux_desc mux_desc = {};
> + char name[32];
> + u32 port_num;
> + int ret;
> +
> + ret = fwnode_property_read_u32(fwnode, "reg", &port_num);
> + if (ret) {
> + dev_err(dev, "Failed to read reg property: %d\n", ret);
> + return ret;
> + }
> +
> + port_data = &switch_desc->typec_ports[port_num];
> + port_data->data = data;
> + port_data->port_num = port_num;
> + port_data->fwnode = fwnode;
> + mux_desc.fwnode = fwnode;
> + mux_desc.drvdata = port_data;
> + snprintf(name, sizeof(name), "%pfwP-%u", fwnode, port_num);
> + mux_desc.name = name;
> + mux_desc.set = mux_set;
> +
> + 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;
you don't need this return here...
> + }
> +
> + return 0;
Just "return ret;" here.
> +}
> +
> +/**
> + * drm_dp_register_typec_switches() - register Type-C switches
> + * @dev: Device that registers Type-C switches
> + * @port: Device node for the switch
> + * @switch_desc: A Type-C switch descriptor
> + * @data: Private data for the switches
> + * @mux_set: Callback function for typec_mux_set
> + *
> + * This function registers USB Type-C switches for DP bridges that can switch
> + * the output signal between their output pins.
> + *
> + * Currently only mode switches are implemented, and the function assumes the
> + * given @port device node has endpoints with "mode-switch" property.
> + * The port number is determined by the "reg" property of the endpoint.
> + */
> +int drm_dp_register_typec_switches(struct device *dev, struct fwnode_handle *port,
> + struct drm_dp_typec_switch_desc *switch_desc,
> + void *data, typec_mux_set_fn_t mux_set)
> +{
> + struct fwnode_handle *sw;
> + int ret;
> +
> + fwnode_for_each_child_node(port, sw) {
> + if (fwnode_property_present(sw, "mode-switch"))
> + switch_desc->num_typec_switches++;
> + }
no need for brackets here
> +
> + if (!switch_desc->num_typec_switches) {
> + dev_dbg(dev, "No Type-C switches node found\n");
dev_warn()?
> + return 0;
> + }
> +
> + 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;
> +
> + /* Register switches for each connector. */
> + fwnode_for_each_child_node(port, sw) {
> + if (!fwnode_property_present(sw, "mode-switch"))
> + continue;
> + ret = drm_dp_register_mode_switch(dev, sw, switch_desc, data, mux_set);
> + if (ret)
> + goto err_unregister_typec_switches;
> + }
> +
> + return 0;
> +
> +err_unregister_typec_switches:
> + fwnode_handle_put(sw);
> + drm_dp_unregister_typec_switches(switch_desc);
> + dev_err(dev, "Failed to register mode switch: %d\n", ret);
there is a bit of dmesg spamming. Please choose where you want to
print the error, either in this function or in
drm_dp_register_mode_switch().
Andi
> + return ret;
> +}
> +EXPORT_SYMBOL(drm_dp_register_typec_switches);
[...]
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