linux-kernel - Re: [PATCH v12 07/10] drm/bridge: anx7625: Register Type C mode switches

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Message-ID: <Y/SstDfugez4/Qx4@smile.fi.intel.com>
Date:   Tue, 21 Feb 2023 13:36:20 +0200
From:   Andy Shevchenko <andriy.shevchenko@...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 <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>,
        linux-kernel@...r.kernel.org, Hsin-Yi Wang <hsinyi@...omium.org>,
        Marek Vasut <marex@...x.de>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel@...ts.freedesktop.org, Xin Ji <xji@...logixsemi.com>,
        Lyude Paul <lyude@...hat.com>,
        Allen Chen <allen.chen@....com.tw>, devicetree@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>, chrome-platform@...ts.linux.dev,
        Javier Martinez Canillas <javierm@...hat.com>,
        linux-acpi@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH v12 07/10] drm/bridge: anx7625: Register Type C mode
 switches

On Tue, Feb 21, 2023 at 05:50:51PM +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.

...

> +static void anx7625_typec_two_ports_update(struct anx7625_data *ctx)
> +{
> +	int i;

unsigned?

+ Blank line.

> +	/* Check if both ports available and do nothing to retain the current one */
> +	if (ctx->port_data[0].dp_connected && ctx->port_data[1].dp_connected)
> +		return;
> +
> +	for (i = 0; i < 2; i++) {
> +		if (ctx->port_data[i].dp_connected)
> +			anx7625_set_crosspoint_switch(ctx,
> +						      ctx->port_data[i].orientation);
> +	}
> +}

...

> +	ctx->port_data[port->port_num].dp_connected =
> +		state->alt && state->alt->svid == USB_TYPEC_DP_SID &&

I would move the first parameter of && to the separate line for slightly better
readability.

> +		state->alt->mode == USB_TYPEC_DP_MODE;

...

> +	for (i = 0; i < switch_desc->num_typec_switches; i++) {
> +		struct drm_dp_typec_port_data *port = &switch_desc->typec_ports[i];
> +		struct fwnode_handle *fwnode = port->fwnode;
> +
> +		num_lanes = fwnode_property_count_u32(fwnode, "data-lanes");

> +

Redundant blank line.

> +		if (num_lanes < 0) {
> +			dev_err(dev,
> +				"Error on getting data lanes count from %pfwP: %d\n",
> +				fwnode, num_lanes);

> +			ret = num_lanes;

Can be written differently:

> +			goto unregister_mux;
> +		}

		ret = ...
		if (ret < 0) {
			...
		}
		num_lanes = ret;


What if it's 0?

> +		ret = fwnode_property_read_u32_array(fwnode, "data-lanes",
> +						     dp_lanes, num_lanes);
> +		if (ret) {
> +			dev_err(dev,
> +				"Failed to read the data-lanes variable: %d\n",
> +				ret);
> +			goto unregister_mux;
> +		}
> +
> +		ctx->port_data[i].orientation = (dp_lanes[0] / 2 == 0) ?
> +			TYPEC_ORIENTATION_REVERSE : TYPEC_ORIENTATION_NORMAL;
> +		ctx->port_data[i].dp_connected = false;
> +	}
> +	complete_all(&ctx->mux_register);
> +
> +	return 0;
> +
> +unregister_mux:
> +	complete_all(&ctx->mux_register);
> +	anx7625_unregister_typec_switches(ctx);
> +	return ret;
> +}

-- 
With Best Regards,
Andy Shevchenko