On 11.03.2023 13:32, Jianhua Lu wrote:
> Add a driver for panels using the Novatek NT36523 display driver IC.
>
> Signed-off-by: Jianhua Lu <[email protected]>
> ---
[...]
> +
> +static int nt36523_get_modes(struct drm_panel *panel,
> + struct drm_connector *connector)
> +{
> + struct panel_info *pinfo = to_panel_info(panel);
> + int i;
> +
> + for (i = 0; i < pinfo->desc->num_modes; i++) {
> + const struct drm_display_mode *m = &pinfo->desc->modes[i];
> + struct drm_display_mode *mode;
> +
> + mode = drm_mode_duplicate(connector->dev, m);
> + if (!mode) {
> + dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
> + m->hdisplay, m->vdisplay, drm_mode_vrefresh(m));
> + return -ENOMEM;
> + }
> +
> + mode->type = DRM_MODE_TYPE_DRIVER;
> + if (pinfo->desc->num_modes == 1)
> + mode->type |= DRM_MODE_TYPE_PREFERRED;
That's not quite correct, as that means "if you have more than one
defined panel mode (say 60Hz and 120 Hz), there will be no preferred one".
Konrad
> +
> + drm_mode_set_name(mode);
> + drm_mode_probed_add(connector, mode);
> + }
> +
> + connector->display_info.width_mm = pinfo->desc->width_mm;
> + connector->display_info.height_mm = pinfo->desc->height_mm;
> + connector->display_info.bpc = pinfo->desc->bpc;
> +
> + return pinfo->desc->num_modes;
> +}
> +
> +static const struct drm_panel_funcs nt36523_panel_funcs = {
> + .disable = nt36523_disable,
> + .prepare = nt36523_prepare,
> + .unprepare = nt36523_unprepare,
> + .get_modes = nt36523_get_modes,
> +};
> +
> +static int nt36523_probe(struct mipi_dsi_device *dsi)
> +{
> + struct device *dev = &dsi->dev;
> + struct device_node *dsi1;
> + struct mipi_dsi_host *dsi1_host;
> + struct panel_info *pinfo;
> + const struct mipi_dsi_device_info *info;
> + int i, ret;
> +
> + pinfo = devm_kzalloc(dev, sizeof(*pinfo), GFP_KERNEL);
> + if (!pinfo)
> + return -ENOMEM;
> +
> + pinfo->vddio = devm_regulator_get(dev, "vddio");
> + if (IS_ERR(pinfo->vddio))
> + return dev_err_probe(dev, PTR_ERR(pinfo->vddio), "failed to get
> vddio regulator\n");
> +
> + pinfo->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> + if (IS_ERR(pinfo->reset_gpio))
> + return dev_err_probe(dev, PTR_ERR(pinfo->reset_gpio), "failed
> to get reset gpio\n");
> +
> + pinfo->desc = of_device_get_match_data(dev);
> + if (!pinfo->desc)
> + return -ENODEV;
> +
> + /* If the panel is dual dsi, register DSI1 */
> + if (pinfo->desc->is_dual_dsi) {
> + info = &pinfo->desc->dsi_info;
> +
> + dsi1 = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
> + if (!dsi1) {
> + dev_err(dev, "cannot get secondary DSI node.\n");
> + return -ENODEV;
> + }
> +
> + dsi1_host = of_find_mipi_dsi_host_by_node(dsi1);
> + of_node_put(dsi1);
> + if (!dsi1_host)
> + return dev_err_probe(dev, -EPROBE_DEFER, "cannot get
> secondary DSI host\n");
> +
> + pinfo->dsi[1] = mipi_dsi_device_register_full(dsi1_host, info);
> + if (!pinfo->dsi[1]) {
> + dev_err(dev, "cannot get secondary DSI device\n");
> + return -ENODEV;
> + }
> + }
> +
> + pinfo->dsi[0] = dsi;
> + mipi_dsi_set_drvdata(dsi, pinfo);
> + drm_panel_init(&pinfo->panel, dev, &nt36523_panel_funcs,
> DRM_MODE_CONNECTOR_DSI);
> +
> + ret = drm_panel_of_backlight(&pinfo->panel);
> + if (ret)
> + return dev_err_probe(dev, ret, "failed to get backlight\n");
> +
> + drm_panel_add(&pinfo->panel);
> +
> + for (i = 0; i < DSI_NUM_MIN + pinfo->desc->is_dual_dsi; i++) {
> + pinfo->dsi[i]->lanes = pinfo->desc->lanes;
> + pinfo->dsi[i]->format = pinfo->desc->format;
> + pinfo->dsi[i]->mode_flags = pinfo->desc->mode_flags;
> +
> + ret = mipi_dsi_attach(pinfo->dsi[i]);
> + if (ret < 0)
> + return dev_err_probe(dev, ret, "cannot attach to DSI%d
> host.\n", i);
> + }
> +
> + return 0;
> +}
> +
> +static const struct of_device_id nt36523_of_match[] = {
> + {
> + .compatible = "xiaomi,elish-boe-nt36523",
> + .data = &elish_boe_desc,
> + },
> + {
> + .compatible = "xiaomi,elish-csot-nt36523",
> + .data = &elish_csot_desc,
> + },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, nt36523_of_match);
> +
> +static struct mipi_dsi_driver nt36523_driver = {
> + .probe = nt36523_probe,
> + .remove = nt36523_remove,
> + .driver = {
> + .name = "panel-novatek-nt36523",
> + .of_match_table = nt36523_of_match,
> + },
> +};
> +module_mipi_dsi_driver(nt36523_driver);
> +
> +MODULE_AUTHOR("Jianhua Lu <[email protected]>");
> +MODULE_DESCRIPTION("DRM driver for Novatek NT36523 based MIPI DSI panels");
> +MODULE_LICENSE("GPL");
