Merge remote-tracking branch 'airlied/drm-next' into drm-intel-next-queued

Git got absolutely destroyed with all our cherry-picking from
drm-intel-next-queued to various branches. It ended up inserting
intel_crtc_page_flip 2x even in intel_display.c.

Backmerge to get back to sanity.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

1 files changed, 478 insertions, 0 deletions

diff --git a/drivers/usb/misc/ucsi.c b/drivers/usb/misc/ucsi.c
new file mode 100644
index 000000000000..07397bddefa3
--- /dev/null
+++ b/drivers/usb/misc/ucsi.c
@@ -0,0 +1,478 @@
+/*
+ * USB Type-C Connector System Software Interface driver
+ *
+ * Copyright (C) 2016, Intel Corporation
+ * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/acpi.h>
+
+#include "ucsi.h"
+
+/* Double the time defined by MIN_TIME_TO_RESPOND_WITH_BUSY */
+#define UCSI_TIMEOUT_MS 20
+
+enum ucsi_status {
+	UCSI_IDLE = 0,
+	UCSI_BUSY,
+	UCSI_ERROR,
+};
+
+struct ucsi_connector {
+	int num;
+	struct ucsi *ucsi;
+	struct work_struct work;
+	struct ucsi_connector_capability cap;
+};
+
+struct ucsi {
+	struct device *dev;
+	struct ucsi_data __iomem *data;
+
+	enum ucsi_status status;
+	struct completion complete;
+	struct ucsi_capability cap;
+	struct ucsi_connector *connector;
+
+	/* device lock */
+	spinlock_t dev_lock;
+
+	/* PPM Communication lock */
+	struct mutex ppm_lock;
+
+	/* PPM communication flags */
+	unsigned long flags;
+#define EVENT_PENDING	0
+#define COMMAND_PENDING	1
+};
+
+static int ucsi_acpi_cmd(struct ucsi *ucsi, struct ucsi_control *ctrl)
+{
+	uuid_le uuid = UUID_LE(0x6f8398c2, 0x7ca4, 0x11e4,
+			       0xad, 0x36, 0x63, 0x10, 0x42, 0xb5, 0x00, 0x8f);
+	union acpi_object *obj;
+
+	ucsi->data->ctrl.raw_cmd = ctrl->raw_cmd;
+
+	obj = acpi_evaluate_dsm(ACPI_HANDLE(ucsi->dev), uuid.b, 1, 1, NULL);
+	if (!obj) {
+		dev_err(ucsi->dev, "%s: failed to evaluate _DSM\n", __func__);
+		return -EIO;
+	}
+
+	ACPI_FREE(obj);
+	return 0;
+}
+
+static void ucsi_acpi_notify(acpi_handle handle, u32 event, void *data)
+{
+	struct ucsi *ucsi = data;
+	struct ucsi_cci *cci;
+
+	spin_lock(&ucsi->dev_lock);
+
+	ucsi->status = UCSI_IDLE;
+	cci = &ucsi->data->cci;
+
+	/*
+	 * REVISIT: This is not documented behavior, but all known PPMs ACK
+	 * asynchronous events by sending notification with cleared CCI.
+	 */
+	if (!ucsi->data->raw_cci) {
+		if (test_bit(EVENT_PENDING, &ucsi->flags))
+			complete(&ucsi->complete);
+		else
+			dev_WARN(ucsi->dev, "spurious notification\n");
+		goto out_unlock;
+	}
+
+	if (test_bit(COMMAND_PENDING, &ucsi->flags)) {
+		if (cci->busy) {
+			ucsi->status = UCSI_BUSY;
+			complete(&ucsi->complete);
+
+			goto out_unlock;
+		} else if (cci->ack_complete || cci->cmd_complete) {
+			/* Error Indication is only valid with commands */
+			if (cci->error && cci->cmd_complete)
+				ucsi->status = UCSI_ERROR;
+
+			ucsi->data->ctrl.raw_cmd = 0;
+			complete(&ucsi->complete);
+		}
+	}
+
+	if (cci->connector_change) {
+		struct ucsi_connector *con;
+
+		/*
+		 * This is workaround for buggy PPMs that create asynchronous
+		 * event notifications before OPM has enabled them.
+		 */
+		if (!ucsi->connector)
+			goto out_unlock;
+
+		con = ucsi->connector + (cci->connector_change - 1);
+
+		/*
+		 * PPM will not clear the connector specific bit in Connector
+		 * Change Indication field of CCI until the driver has ACK it,
+		 * and the driver can not ACK it before it has been processed.
+		 * The PPM will not generate new events before the first has
+		 * been acknowledged, even if they are for an other connector.
+		 * So only one event at a time.
+		 */
+		if (!test_and_set_bit(EVENT_PENDING, &ucsi->flags))
+			schedule_work(&con->work);
+	}
+out_unlock:
+	spin_unlock(&ucsi->dev_lock);
+}
+
+static int ucsi_ack(struct ucsi *ucsi, u8 cmd)
+{
+	struct ucsi_control ctrl;
+	int ret;
+
+	ctrl.cmd.cmd = UCSI_ACK_CC_CI;
+	ctrl.cmd.length = 0;
+	ctrl.cmd.data = cmd;
+	ret = ucsi_acpi_cmd(ucsi, &ctrl);
+	if (ret)
+		return ret;
+
+	/* Waiting for ACK also with ACK CMD for now */
+	ret = wait_for_completion_timeout(&ucsi->complete,
+					  msecs_to_jiffies(UCSI_TIMEOUT_MS));
+	if (!ret)
+		return -ETIMEDOUT;
+	return 0;
+}
+
+static int ucsi_run_cmd(struct ucsi *ucsi, struct ucsi_control *ctrl,
+			void *data, size_t size)
+{
+	u16 err_value = 0;
+	int ret;
+
+	set_bit(COMMAND_PENDING, &ucsi->flags);
+
+	ret = ucsi_acpi_cmd(ucsi, ctrl);
+	if (ret)
+		goto err_clear_flag;
+
+	ret = wait_for_completion_timeout(&ucsi->complete,
+					  msecs_to_jiffies(UCSI_TIMEOUT_MS));
+	if (!ret) {
+		ret = -ETIMEDOUT;
+		goto err_clear_flag;
+	}
+
+	switch (ucsi->status) {
+	case UCSI_IDLE:
+		if (data)
+			memcpy(data, ucsi->data->message_in, size);
+
+		ret = ucsi_ack(ucsi, UCSI_ACK_CMD);
+		break;
+	case UCSI_BUSY:
+		/* The caller decides whether to cancel or not */
+		ret = -EBUSY;
+		goto err_clear_flag;
+	case UCSI_ERROR:
+		ret = ucsi_ack(ucsi, UCSI_ACK_CMD);
+		if (ret)
+			goto err_clear_flag;
+
+		ctrl->cmd.cmd = UCSI_GET_ERROR_STATUS;
+		ctrl->cmd.length = 0;
+		ctrl->cmd.data = 0;
+		ret = ucsi_acpi_cmd(ucsi, ctrl);
+		if (ret)
+			goto err_clear_flag;
+
+		ret = wait_for_completion_timeout(&ucsi->complete,
+					msecs_to_jiffies(UCSI_TIMEOUT_MS));
+		if (!ret) {
+			ret = -ETIMEDOUT;
+			goto err_clear_flag;
+		}
+
+		memcpy(&err_value, ucsi->data->message_in, sizeof(err_value));
+
+		/* Something has really gone wrong */
+		if (WARN_ON(ucsi->status == UCSI_ERROR)) {
+			ret = -ENODEV;
+			goto err_clear_flag;
+		}
+
+		ret = ucsi_ack(ucsi, UCSI_ACK_CMD);
+		if (ret)
+			goto err_clear_flag;
+
+		switch (err_value) {
+		case UCSI_ERROR_INCOMPATIBLE_PARTNER:
+			ret = -EOPNOTSUPP;
+			break;
+		case UCSI_ERROR_CC_COMMUNICATION_ERR:
+			ret = -ECOMM;
+			break;
+		case UCSI_ERROR_CONTRACT_NEGOTIATION_FAIL:
+			ret = -EIO;
+			break;
+		case UCSI_ERROR_DEAD_BATTERY:
+			dev_warn(ucsi->dev, "Dead battery condition!\n");
+			ret = -EPERM;
+			break;
+		/* The following mean a bug in this driver */
+		case UCSI_ERROR_INVALID_CON_NUM:
+		case UCSI_ERROR_UNREGONIZED_CMD:
+		case UCSI_ERROR_INVALID_CMD_ARGUMENT:
+		default:
+			dev_warn(ucsi->dev,
+				 "%s: possible UCSI driver bug - error %hu\n",
+				 __func__, err_value);
+			ret = -EINVAL;
+			break;
+		}
+		break;
+	}
+	ctrl->raw_cmd = 0;
+err_clear_flag:
+	clear_bit(COMMAND_PENDING, &ucsi->flags);
+	return ret;
+}
+
+static void ucsi_connector_change(struct work_struct *work)
+{
+	struct ucsi_connector *con = container_of(work, struct ucsi_connector,
+						  work);
+	struct ucsi_connector_status constat;
+	struct ucsi *ucsi = con->ucsi;
+	struct ucsi_control ctrl;
+	int ret;
+
+	mutex_lock(&ucsi->ppm_lock);
+
+	ctrl.cmd.cmd = UCSI_GET_CONNECTOR_STATUS;
+	ctrl.cmd.length = 0;
+	ctrl.cmd.data = con->num;
+	ret = ucsi_run_cmd(con->ucsi, &ctrl, &constat, sizeof(constat));
+	if (ret) {
+		dev_err(ucsi->dev, "%s: failed to read connector status (%d)\n",
+			__func__, ret);
+		goto out_ack_event;
+	}
+
+	/* Ignoring disconnections and Alternate Modes */
+	if (!constat.connected || !(constat.change &
+	    (UCSI_CONSTAT_PARTNER_CHANGE | UCSI_CONSTAT_CONNECT_CHANGE)) ||
+	    constat.partner_flags & UCSI_CONSTAT_PARTNER_FLAG_ALT_MODE)
+		goto out_ack_event;
+
+	/* If the partner got USB Host role, attempting swap */
+	if (constat.partner_type & UCSI_CONSTAT_PARTNER_TYPE_DFP) {
+		ctrl.uor.cmd = UCSI_SET_UOR;
+		ctrl.uor.con_num = con->num;
+		ctrl.uor.role = UCSI_UOR_ROLE_DFP;
+
+		ret = ucsi_run_cmd(con->ucsi, &ctrl, NULL, 0);
+		if (ret)
+			dev_err(ucsi->dev, "%s: failed to swap role (%d)\n",
+				__func__, ret);
+	}
+out_ack_event:
+	ucsi_ack(ucsi, UCSI_ACK_EVENT);
+	clear_bit(EVENT_PENDING, &ucsi->flags);
+	mutex_unlock(&ucsi->ppm_lock);
+}
+
+static int ucsi_reset_ppm(struct ucsi *ucsi)
+{
+	int timeout = UCSI_TIMEOUT_MS;
+	struct ucsi_control ctrl;
+	int ret;
+
+	memset(&ctrl, 0, sizeof(ctrl));
+	ctrl.cmd.cmd = UCSI_PPM_RESET;
+	ret = ucsi_acpi_cmd(ucsi, &ctrl);
+	if (ret)
+		return ret;
+
+	/* There is no quarantee the PPM will ever set the RESET_COMPLETE bit */
+	while (!ucsi->data->cci.reset_complete && timeout--)
+		usleep_range(1000, 2000);
+	return 0;
+}
+
+static int ucsi_init(struct ucsi *ucsi)
+{
+	struct ucsi_connector *con;
+	struct ucsi_control ctrl;
+	int ret;
+	int i;
+
+	init_completion(&ucsi->complete);
+	spin_lock_init(&ucsi->dev_lock);
+	mutex_init(&ucsi->ppm_lock);
+
+	/* Reset the PPM */
+	ret = ucsi_reset_ppm(ucsi);
+	if (ret)
+		return ret;
+
+	/*
+	 * REVISIT: Executing second reset to WA an issue seen on some of the
+	 * Broxton based platforms, where the first reset puts the PPM into a
+	 * state where it's unable to recognise some of the commands.
+	 */
+	ret = ucsi_reset_ppm(ucsi);
+	if (ret)
+		return ret;
+
+	mutex_lock(&ucsi->ppm_lock);
+
+	/* Enable basic notifications */
+	ctrl.cmd.cmd = UCSI_SET_NOTIFICATION_ENABLE;
+	ctrl.cmd.length = 0;
+	ctrl.cmd.data = UCSI_ENABLE_NTFY_CMD_COMPLETE | UCSI_ENABLE_NTFY_ERROR;
+	ret = ucsi_run_cmd(ucsi, &ctrl, NULL, 0);
+	if (ret)
+		goto err_reset;
+
+	/* Get PPM capabilities */
+	ctrl.cmd.cmd = UCSI_GET_CAPABILITY;
+	ret = ucsi_run_cmd(ucsi, &ctrl, &ucsi->cap, sizeof(ucsi->cap));
+	if (ret)
+		goto err_reset;
+
+	if (!ucsi->cap.num_connectors) {
+		ret = -ENODEV;
+		goto err_reset;
+	}
+
+	ucsi->connector = devm_kcalloc(ucsi->dev, ucsi->cap.num_connectors,
+				       sizeof(*ucsi->connector), GFP_KERNEL);
+	if (!ucsi->connector) {
+		ret = -ENOMEM;
+		goto err_reset;
+	}
+
+	for (i = 1, con = ucsi->connector; i < ucsi->cap.num_connectors + 1;
+	     i++, con++) {
+		/* Get connector capability */
+		ctrl.cmd.cmd = UCSI_GET_CONNECTOR_CAPABILITY;
+		ctrl.cmd.data = i;
+		ret = ucsi_run_cmd(ucsi, &ctrl, &con->cap, sizeof(con->cap));
+		if (ret)
+			goto err_reset;
+
+		con->num = i;
+		con->ucsi = ucsi;
+		INIT_WORK(&con->work, ucsi_connector_change);
+	}
+
+	/* Enable all notifications */
+	ctrl.cmd.cmd = UCSI_SET_NOTIFICATION_ENABLE;
+	ctrl.cmd.data = UCSI_ENABLE_NTFY_ALL;
+	ret = ucsi_run_cmd(ucsi, &ctrl, NULL, 0);
+	if (ret < 0)
+		goto err_reset;
+
+	mutex_unlock(&ucsi->ppm_lock);
+	return 0;
+err_reset:
+	ucsi_reset_ppm(ucsi);
+	mutex_unlock(&ucsi->ppm_lock);
+	return ret;
+}
+
+static int ucsi_acpi_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	acpi_status status;
+	struct ucsi *ucsi;
+	int ret;
+
+	ucsi = devm_kzalloc(&pdev->dev, sizeof(*ucsi), GFP_KERNEL);
+	if (!ucsi)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "missing memory resource\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * NOTE: ACPI has claimed the memory region as it's also an Operation
+	 * Region. It's not possible to request it in the driver.
+	 */
+	ucsi->data = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+	if (!ucsi->data)
+		return -ENOMEM;
+
+	ucsi->dev = &pdev->dev;
+
+	status = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev),
+					     ACPI_ALL_NOTIFY,
+					     ucsi_acpi_notify, ucsi);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	ret = ucsi_init(ucsi);
+	if (ret) {
+		acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
+					   ACPI_ALL_NOTIFY,
+					   ucsi_acpi_notify);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, ucsi);
+	return 0;
+}
+
+static int ucsi_acpi_remove(struct platform_device *pdev)
+{
+	struct ucsi *ucsi = platform_get_drvdata(pdev);
+
+	acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
+				   ACPI_ALL_NOTIFY, ucsi_acpi_notify);
+
+	/* Make sure there are no events in the middle of being processed */
+	if (wait_on_bit_timeout(&ucsi->flags, EVENT_PENDING,
+				TASK_UNINTERRUPTIBLE,
+				msecs_to_jiffies(UCSI_TIMEOUT_MS)))
+		dev_WARN(ucsi->dev, "%s: Events still pending\n", __func__);
+
+	ucsi_reset_ppm(ucsi);
+	return 0;
+}
+
+static const struct acpi_device_id ucsi_acpi_match[] = {
+	{ "PNP0CA0", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, ucsi_acpi_match);
+
+static struct platform_driver ucsi_acpi_platform_driver = {
+	.driver = {
+		.name = "ucsi_acpi",
+		.acpi_match_table = ACPI_PTR(ucsi_acpi_match),
+	},
+	.probe = ucsi_acpi_probe,
+	.remove = ucsi_acpi_remove,
+};
+
+module_platform_driver(ucsi_acpi_platform_driver);
+
+MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("USB Type-C System Software Interface (UCSI) driver");