--- /dev/null
+/*
+ * Copyright (C) 2012 Avionic Design GmbH
+ * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
+ *
+ * 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/of_gpio.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_panel.h>
+#include "drm.h"
+
+int tegra_output_connector_get_modes(struct drm_connector *connector)
+{
+ struct tegra_output *output = connector_to_output(connector);
+ struct edid *edid = NULL;
+ int err = 0;
+
+ /*
+ * If the panel provides one or more modes, use them exclusively and
+ * ignore any other means of obtaining a mode.
+ */
+ if (output->panel) {
+ err = output->panel->funcs->get_modes(output->panel);
+ if (err > 0)
+ return err;
+ }
+
+ if (output->edid)
+ edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
+ else if (output->ddc)
+ edid = drm_get_edid(connector, output->ddc);
+
+ drm_mode_connector_update_edid_property(connector, edid);
+
+ if (edid) {
+ err = drm_add_edid_modes(connector, edid);
+ kfree(edid);
+ }
+
+ return err;
+}
+
+struct drm_encoder *
+tegra_output_connector_best_encoder(struct drm_connector *connector)
+{
+ struct tegra_output *output = connector_to_output(connector);
+
+ return &output->encoder;
+}
+
+enum drm_connector_status
+tegra_output_connector_detect(struct drm_connector *connector, bool force)
+{
+ struct tegra_output *output = connector_to_output(connector);
+ enum drm_connector_status status = connector_status_unknown;
+
+ if (gpio_is_valid(output->hpd_gpio)) {
+ if (gpio_get_value(output->hpd_gpio) == 0)
+ status = connector_status_disconnected;
+ else
+ status = connector_status_connected;
+ } else {
+ if (!output->panel)
+ status = connector_status_disconnected;
+ else
+ status = connector_status_connected;
+ }
+
+ return status;
+}
+
+void tegra_output_connector_destroy(struct drm_connector *connector)
+{
+ drm_connector_unregister(connector);
+ drm_connector_cleanup(connector);
+}
+
+void tegra_output_encoder_destroy(struct drm_encoder *encoder)
+{
+ drm_encoder_cleanup(encoder);
+}
+
+static irqreturn_t hpd_irq(int irq, void *data)
+{
+ struct tegra_output *output = data;
+
+ if (output->connector.dev)
+ drm_helper_hpd_irq_event(output->connector.dev);
+
+ return IRQ_HANDLED;
+}
+
+int tegra_output_probe(struct tegra_output *output)
+{
+ struct device_node *ddc, *panel;
+ enum of_gpio_flags flags;
+ int err, size;
+
+ if (!output->of_node)
+ output->of_node = output->dev->of_node;
+
+ panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
+ if (panel) {
+ output->panel = of_drm_find_panel(panel);
+ if (!output->panel)
+ return -EPROBE_DEFER;
+
+ of_node_put(panel);
+ }
+
+ output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
+
+ ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
+ if (ddc) {
+ output->ddc = of_find_i2c_adapter_by_node(ddc);
+ if (!output->ddc) {
+ err = -EPROBE_DEFER;
+ of_node_put(ddc);
+ return err;
+ }
+
+ of_node_put(ddc);
+ }
+
+ output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
+ "nvidia,hpd-gpio", 0,
+ &flags);
+ if (gpio_is_valid(output->hpd_gpio)) {
+ unsigned long flags;
+
+ err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
+ "HDMI hotplug detect");
+ if (err < 0) {
+ dev_err(output->dev, "gpio_request_one(): %d\n", err);
+ return err;
+ }
+
+ err = gpio_to_irq(output->hpd_gpio);
+ if (err < 0) {
+ dev_err(output->dev, "gpio_to_irq(): %d\n", err);
+ gpio_free(output->hpd_gpio);
+ return err;
+ }
+
+ output->hpd_irq = err;
+
+ flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+ IRQF_ONESHOT;
+
+ err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
+ flags, "hpd", output);
+ if (err < 0) {
+ dev_err(output->dev, "failed to request IRQ#%u: %d\n",
+ output->hpd_irq, err);
+ gpio_free(output->hpd_gpio);
+ return err;
+ }
+
+ output->connector.polled = DRM_CONNECTOR_POLL_HPD;
+
+ /*
+ * Disable the interrupt until the connector has been
+ * initialized to avoid a race in the hotplug interrupt
+ * handler.
+ */
+ disable_irq(output->hpd_irq);
+ }
+
+ return 0;
+}
+
+void tegra_output_remove(struct tegra_output *output)
+{
+ if (gpio_is_valid(output->hpd_gpio)) {
+ free_irq(output->hpd_irq, output);
+ gpio_free(output->hpd_gpio);
+ }
+
+ if (output->ddc)
+ put_device(&output->ddc->dev);
+}
+
+int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
+{
+ int err;
+
+ if (output->panel) {
+ err = drm_panel_attach(output->panel, &output->connector);
+ if (err < 0)
+ return err;
+ }
+
+ /*
+ * The connector is now registered and ready to receive hotplug events
+ * so the hotplug interrupt can be enabled.
+ */
+ if (gpio_is_valid(output->hpd_gpio))
+ enable_irq(output->hpd_irq);
+
+ return 0;
+}
+
+void tegra_output_exit(struct tegra_output *output)
+{
+ /*
+ * The connector is going away, so the interrupt must be disabled to
+ * prevent the hotplug interrupt handler from potentially crashing.
+ */
+ if (gpio_is_valid(output->hpd_gpio))
+ disable_irq(output->hpd_irq);
+
+ if (output->panel)
+ drm_panel_detach(output->panel);
+}
Code Review / kvmfornfv.git / blobdiff