From patchwork Thu Nov 24 10:20:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pin-yen Lin X-Patchwork-Id: 628610 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C2A7C433FE for ; Thu, 24 Nov 2022 10:22:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229882AbiKXKWl (ORCPT ); Thu, 24 Nov 2022 05:22:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37596 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230062AbiKXKV5 (ORCPT ); Thu, 24 Nov 2022 05:21:57 -0500 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 21E141541A5 for ; Thu, 24 Nov 2022 02:21:52 -0800 (PST) Received: by mail-pj1-x1035.google.com with SMTP id ci10so1047667pjb.1 for ; Thu, 24 Nov 2022 02:21:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=2lj9TOq4Mi1yjs5u7EUelEqMG61qPa6abk6tN/y0iWc=; b=dh73Yb5LdX3XzNMgeceewCLByB4kWa76LmjwGRhHetVfb+CTAGgtAq5OTOlGq1UIUU N5maCRzze0/a+LAv9FVd004ct9wIXxE5OfztI8aNUhcr+K8WLORlTU6U/+GI93MusNF9 tlo96VnZBJaBiQbAN7YVW60Xdb7XdmMurNEcc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=2lj9TOq4Mi1yjs5u7EUelEqMG61qPa6abk6tN/y0iWc=; b=gagEFDd6x024mq6XvW65LmVseZn+G2kAqjTuDsQ/cfsneHdufwBenH0wzRu7lZeXqk iYWRtA9PYOmf4Qk4TDkiom9NJt38MPegGpevhNHPxGzph1NwVy0twfluJ+8ETdF65UgE TmDg1Ra/rpwBJFw+fDleJJuBUCW51uXr7+3UoWD1DjfM/Y4Qfc9bQyH0/R2Cx+Y+ldNa +FS7OYzywsD6cPgoYtxloJ1zqNbWEjSLjbtA23SIDR+MzNl/qk9nfpNQRnGr+i39WBe7 JppXUuDSuUSesnEjSZeQTmlWMPXBokKhgvVLV/vgzOIyBbqELi25iyMoNj42hvVx6wEc C7aA== X-Gm-Message-State: ANoB5plmpwOEhyhypi3jpldeD4MyiP/SnJH3XfyFvtW9bXGq2nwUK6Mm ICXRdxCon/BHcfAadbdg6rBPxQ== X-Google-Smtp-Source: AA0mqf5vM89hcYo+bffA1QF85tTKpfgIDPFWo2QBf9erTyQa+wFSdxLwOaGJ+X+28Ax9kTHSiczlKA== X-Received: by 2002:a17:90a:71c8:b0:213:caaf:411 with SMTP id m8-20020a17090a71c800b00213caaf0411mr16426875pjs.74.1669285311724; Thu, 24 Nov 2022 02:21:51 -0800 (PST) Received: from treapking.tpe.corp.google.com ([2401:fa00:1:10:d446:708:8556:dfee]) by smtp.gmail.com with ESMTPSA id t123-20020a625f81000000b005747b59fc54sm854584pfb.172.2022.11.24.02.21.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Nov 2022 02:21:51 -0800 (PST) From: Pin-yen Lin To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Daniel Vetter , Rob Herring , Krzysztof Kozlowski , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Greg Kroah-Hartman , "Rafael J . Wysocki" , Prashant Malani , Benson Leung , Guenter Roeck Cc: Javier Martinez Canillas , Stephen Boyd , dri-devel@lists.freedesktop.org, Hsin-Yi Wang , Thomas Zimmermann , devicetree@vger.kernel.org, Pin-yen Lin , chrome-platform@lists.linux.dev, linux-acpi@vger.kernel.org, Marek Vasut , Xin Ji , Lyude Paul , =?utf-8?q?N=C3=ADcolas_F_=2E_R_=2E_A_=2E_Pra?= =?utf-8?q?do?= , AngeloGioacchino Del Regno , linux-kernel@vger.kernel.org, Allen Chen Subject: [PATCH v6 7/7] drm/bridge: it6505: Register Type C mode switches Date: Thu, 24 Nov 2022 18:20:56 +0800 Message-Id: <20221124102056.393220-8-treapking@chromium.org> X-Mailer: git-send-email 2.38.1.584.g0f3c55d4c2-goog In-Reply-To: <20221124102056.393220-1-treapking@chromium.org> References: <20221124102056.393220-1-treapking@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Register USB Type-C mode switches when the "mode-switch" property and relevant port are available in Device Tree. Configure the "lane_swap" state based on the entered alternate mode for a specific Type-C connector, which ends up updating the lane swap registers of the it6505 chip. Signed-off-by: Pin-yen Lin --- Changes in v6: - Changed it6505_typec_mux_set callback function to accommodate with the latest drm-misc patches - Changed the driver implementation to accommodate with the new binding - Squashed to a single patch drivers/gpu/drm/bridge/Kconfig | 1 + drivers/gpu/drm/bridge/ite-it6505.c | 205 +++++++++++++++++++++++++++- 2 files changed, 202 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index 57946d80b02d..9b1240ef3981 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -87,6 +87,7 @@ config DRM_FSL_LDB config DRM_ITE_IT6505 tristate "ITE IT6505 DisplayPort bridge" depends on OF + depends on TYPEC || TYPEC=n select DRM_DISPLAY_DP_HELPER select DRM_DISPLAY_HDCP_HELPER select DRM_DISPLAY_HELPER diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c index 21a9b8422bda..37e2bd8d8d79 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -17,6 +17,8 @@ #include #include #include +#include +#include #include #include @@ -30,6 +32,7 @@ #include #include #include +#include #include @@ -402,6 +405,12 @@ struct debugfs_entries { const struct file_operations *fops; }; +struct it6505_port_data { + bool dp_connected; + struct typec_mux_dev *typec_mux; + struct it6505 *it6505; +}; + struct it6505 { struct drm_dp_aux aux; struct drm_bridge bridge; @@ -454,6 +463,8 @@ struct it6505 { struct delayed_work delayed_audio; struct it6505_audio_data audio; struct dentry *debugfs; + int num_typec_switches; + struct it6505_port_data *typec_ports; /* it6505 driver hold option */ bool enable_drv_hold; @@ -3265,13 +3276,185 @@ static void it6505_shutdown(struct i2c_client *client) it6505_lane_off(it6505); } +static void it6505_typec_ports_update(struct it6505 *it6505) +{ + usleep_range(3000, 4000); + + if (it6505->typec_ports[0].dp_connected && it6505->typec_ports[1].dp_connected) + /* Both ports available, do nothing to retain the current one. */ + return; + else if (it6505->typec_ports[0].dp_connected) + it6505->lane_swap = false; + else if (it6505->typec_ports[1].dp_connected) + it6505->lane_swap = true; + + usleep_range(3000, 4000); +} + +static int it6505_typec_mux_set(struct typec_mux_dev *mux, + struct typec_mux_state *state) +{ + struct it6505_port_data *data = typec_mux_get_drvdata(mux); + struct it6505 *it6505 = data->it6505; + struct device *dev = &it6505->client->dev; + bool old_dp_connected, new_dp_connected; + + if (it6505->num_typec_switches == 1) + return 0; + + mutex_lock(&it6505->extcon_lock); + + old_dp_connected = it6505->typec_ports[0].dp_connected || + it6505->typec_ports[1].dp_connected; + + data->dp_connected = (state->alt && state->alt->svid == USB_TYPEC_DP_SID && + state->alt->mode == USB_TYPEC_DP_MODE); + + dev_dbg(dev, "mux_set dp_connected: c0=%d, c1=%d\n", + it6505->typec_ports[0].dp_connected, it6505->typec_ports[1].dp_connected); + + new_dp_connected = it6505->typec_ports[0].dp_connected || + it6505->typec_ports[1].dp_connected; + + if (it6505->enable_drv_hold) { + dev_dbg(dev, "enable driver hold\n"); + goto unlock; + } + + it6505_typec_ports_update(it6505); + + if (!old_dp_connected && new_dp_connected) { + int ret = pm_runtime_get_sync(dev); + + /* + * On system resume, mux_set can be triggered before + * pm_runtime_force_resume re-enables runtime power management. + * Handling the error here to make sure the bridge is powered on. + */ + if (ret < 0) + it6505_poweron(it6505); + + complete_all(&it6505->extcon_completion); + } + + if (old_dp_connected && !new_dp_connected) { + reinit_completion(&it6505->extcon_completion); + pm_runtime_put_sync(dev); + if (it6505->bridge.dev) + drm_helper_hpd_irq_event(it6505->bridge.dev); + memset(it6505->dpcd, 0, sizeof(it6505->dpcd)); + } + +unlock: + mutex_unlock(&it6505->extcon_lock); + return 0; +} + +static int it6505_register_mode_switch(struct device *dev, struct device_node *node, + struct it6505 *it6505) +{ + struct it6505_port_data *port_data; + struct typec_mux_desc mux_desc = {}; + char name[32]; + u32 dp_lanes[2]; + int ret, num_lanes, i, port_num = -1; + + num_lanes = drm_of_get_data_lanes_count(node, 0, 2); + if (num_lanes <= 0) { + dev_err(dev, "Error on getting data lanes count: %d\n", + num_lanes); + return num_lanes; + } + + ret = of_property_read_u32_array(node, "data-lanes", dp_lanes, num_lanes); + if (ret) { + dev_err(dev, "Failed to read the data-lanes variable: %d\n", + ret); + return ret; + } + + for (i = 0; i < num_lanes; i++) { + if (port_num != -1 && port_num != dp_lanes[i] / 2) { + dev_err(dev, "Invalid data lane numbers\n"); + return -EINVAL; + } + port_num = dp_lanes[i] / 2; + } + + port_data = &it6505->typec_ports[port_num]; + port_data->it6505 = it6505; + mux_desc.fwnode = &node->fwnode; + mux_desc.drvdata = port_data; + snprintf(name, sizeof(name), "%s-%u", node->name, port_num); + mux_desc.name = name; + mux_desc.set = it6505_typec_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; +} + +static void it6505_unregister_typec_switches(struct it6505 *it6505) +{ + int i; + + for (i = 0; i < it6505->num_typec_switches; i++) + typec_mux_unregister(it6505->typec_ports[i].typec_mux); +} + +static int it6505_register_typec_switches(struct device *dev, struct it6505 *it6505) +{ + struct device_node *port, *sw; + int ret = 0; + + port = of_graph_get_port_by_id(dev->of_node, 1); + + for_each_child_of_node(port, sw) { + if (of_property_read_bool(sw, "mode-switch")) + it6505->num_typec_switches++; + } + + if (!it6505->num_typec_switches) { + dev_warn(dev, "No Type-C switches node found\n"); + return ret; + } + + it6505->typec_ports = devm_kzalloc( + dev, it6505->num_typec_switches * sizeof(struct it6505_port_data), + GFP_KERNEL); + if (!it6505->typec_ports) + return -ENOMEM; + + /* Register switches for each connector. */ + for_each_child_of_node(port, sw) { + if (!of_property_read_bool(sw, "mode-switch")) + continue; + ret = it6505_register_mode_switch(dev, sw, it6505); + if (ret) { + dev_err(dev, "Failed to register mode switch: %d\n", ret); + of_node_put(sw); + break; + } + } + + if (ret) + it6505_unregister_typec_switches(it6505); + + return ret; +} + static int it6505_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct it6505 *it6505; struct device *dev = &client->dev; struct extcon_dev *extcon; - int err, intp_irq; + int err, intp_irq, ret; it6505 = devm_kzalloc(&client->dev, sizeof(*it6505), GFP_KERNEL); if (!it6505) @@ -3292,11 +3475,24 @@ static int it6505_i2c_probe(struct i2c_client *client, if (PTR_ERR(extcon) == -EPROBE_DEFER) return -EPROBE_DEFER; if (IS_ERR(extcon)) { - dev_err(dev, "can not get extcon device!"); - return PTR_ERR(extcon); + if (PTR_ERR(extcon) != -ENODEV) + dev_warn(dev, "Cannot get extcon device: %ld\n", + PTR_ERR(extcon)); + it6505->extcon = NULL; + } else { + it6505->extcon = extcon; } - it6505->extcon = extcon; + ret = it6505_register_typec_switches(dev, it6505); + if (ret) { + if (ret != -ENODEV) + dev_warn(dev, "Didn't register Type-C switches, err: %d\n", + ret); + if (!it6505->extcon) { + dev_err(dev, "Both extcon and typec-switch are not registered.\n"); + return -EINVAL; + } + } it6505->regmap = devm_regmap_init_i2c(client, &it6505_regmap_config); if (IS_ERR(it6505->regmap)) { @@ -3367,6 +3563,7 @@ static void it6505_i2c_remove(struct i2c_client *client) drm_dp_aux_unregister(&it6505->aux); it6505_debugfs_remove(it6505); it6505_poweroff(it6505); + it6505_unregister_typec_switches(it6505); } static const struct i2c_device_id it6505_id[] = {