Re: [PATCH v3 2/2] display/drm/bridge: TC358775 DSI/LVDS driver

Sam Ravnborg
2020-06-20T10:32:30Z

Hi Vinay.

> +
> +static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
> +{
> + struct device *dev = &client->dev;
> + struct drm_panel *panel;
> + struct tc_data *tc;
> + int ret;
> +
> + tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL);
> + if (!tc)
> + return -ENOMEM;
> +
> + tc->dev = dev;
> + tc->i2c = client;
> +
> + ret = drm_of_find_panel_or_bridge(dev->of_node, TC358775_LVDS_OUT0,
> + 0, &panel, NULL);
> + if (ret < 0)
> + return ret;
> + if (!panel)
> + return -ENODEV;
> +
> + panel->connector_type = DRM_MODE_CONNECTOR_LVDS;

The panel is responsible for specifying the connector_type.
It is wrong to let users of panel set it.

Fix the panel and not the bridge driver.

> +
> + tc->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
> + if (IS_ERR(tc->panel_bridge))
> + return PTR_ERR(tc->panel_bridge);
> +
> + ret = tc358775_parse_dt(dev->of_node, tc);
> + if (ret)
> + return ret;
> +
> + tc->vddio = devm_regulator_get(dev, "vddio-supply");
> + if (IS_ERR(tc->vddio)) {
> + ret = PTR_ERR(tc->vddio);
> + dev_err(dev, "vddio-supply not found\n");
> + return ret;
> + }
> +
> + tc->vdd = devm_regulator_get(dev, "vdd-supply");
> + if (IS_ERR(tc->vdd)) {
> + ret = PTR_ERR(tc->vddio);
> + dev_err(dev, "vdd-supply not found\n");
> + return ret;
> + }
> +
> + tc->stby_gpio = devm_gpiod_get(dev, "stby", GPIOD_OUT_HIGH);
> + if (IS_ERR(tc->stby_gpio)) {
> + ret = PTR_ERR(tc->stby_gpio);
> + dev_err(dev, "cannot get stby-gpio %d\n", ret);
> + return ret;
> + }
> +
> + tc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> + if (IS_ERR(tc->reset_gpio)) {
> + ret = PTR_ERR(tc->reset_gpio);
> + dev_err(dev, "cannot get reset-gpios %d\n", ret);
> + return ret;
> + }
> +
> + tc->bridge.funcs = &tc_bridge_funcs;
> + tc->bridge.of_node = dev->of_node;
> + drm_bridge_add(&tc->bridge);
> +
> + i2c_set_clientdata(client, tc);
> +
> + return 0;
> +}
> +

Sam