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>> + >> +    dsi->lanes = 4; >> +    dsi->format = MIPI_DSI_FMT_RGB888; >> +    dsi->mode_flags = MIPI_DSI_MODE_VIDEO | >> MIPI_DSI_MODE_VIDEO_SYNC_PULSE | >> +              MIPI_DSI_CLOCK_NON_CONTINUOUS | MIPI_DSI_MODE_LPM; >> + >> +    drm_panel_init(&priv->panel, dev, &renesas_r69328_panel_funcs, >> +               DRM_MODE_CONNECTOR_DSI); >> + >> +    ret = drm_panel_of_backlight(&priv->panel); >> +    if (ret) >> +        return dev_err_probe(dev, ret, "Failed to get backlight\n"); > > > drm_panel_of_backlight, 0 on success, or a negative error code on > failure so >     if( ret > 0) ie if( ret < 0) > >> + >> +    drm_panel_add(&priv->panel); >> + >> +    ret = mipi_dsi_attach(dsi); > > if ( ret > 0) it return negative error code ie if( ret < 0) > >> +    if (ret) { >> +        dev_err(dev, "Failed to attach to DSI host: %d\n", ret); >> +        drm_panel_remove(&priv->panel); >> +        return ret; > > use return dev_err_probe > >> +    } >> + >> +    return 0; >> +} >> + >> +static void renesas_r69328_remove(struct mipi_dsi_device *dsi) >> +{ >> +    struct renesas_r69328 *priv = mipi_dsi_get_drvdata(dsi); >> +    int ret; >> + >> +    ret = mipi_dsi_detach(dsi); > > if ( ret > 0) it return negative error code ie if( ret < 0) > >> +    if (ret) >> +        dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret); >> + Thanks, Alok