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![Thierry Reding](/assets/img/avatar_default.png)
Support low-active hotplug detect signals by storing the GPIO flags parsed from device tree. Signed-off-by: Thierry Reding <treding@nvidia.com>
222 lines
5.1 KiB
C
222 lines
5.1 KiB
C
/*
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* Copyright (C) 2012 Avionic Design GmbH
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* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_panel.h>
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#include "drm.h"
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int tegra_output_connector_get_modes(struct drm_connector *connector)
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{
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struct tegra_output *output = connector_to_output(connector);
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struct edid *edid = NULL;
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int err = 0;
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/*
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* If the panel provides one or more modes, use them exclusively and
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* ignore any other means of obtaining a mode.
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*/
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if (output->panel) {
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err = output->panel->funcs->get_modes(output->panel);
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if (err > 0)
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return err;
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}
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if (output->edid)
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edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
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else if (output->ddc)
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edid = drm_get_edid(connector, output->ddc);
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drm_mode_connector_update_edid_property(connector, edid);
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if (edid) {
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err = drm_add_edid_modes(connector, edid);
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kfree(edid);
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}
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return err;
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}
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struct drm_encoder *
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tegra_output_connector_best_encoder(struct drm_connector *connector)
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{
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struct tegra_output *output = connector_to_output(connector);
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return &output->encoder;
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}
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enum drm_connector_status
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tegra_output_connector_detect(struct drm_connector *connector, bool force)
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{
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struct tegra_output *output = connector_to_output(connector);
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enum drm_connector_status status = connector_status_unknown;
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if (gpio_is_valid(output->hpd_gpio)) {
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if (output->hpd_gpio_flags & OF_GPIO_ACTIVE_LOW) {
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if (gpio_get_value(output->hpd_gpio) != 0)
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status = connector_status_disconnected;
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else
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status = connector_status_connected;
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} else {
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if (gpio_get_value(output->hpd_gpio) == 0)
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status = connector_status_disconnected;
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else
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status = connector_status_connected;
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}
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} else {
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if (!output->panel)
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status = connector_status_disconnected;
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else
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status = connector_status_connected;
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}
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return status;
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}
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void tegra_output_connector_destroy(struct drm_connector *connector)
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{
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drm_connector_unregister(connector);
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drm_connector_cleanup(connector);
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}
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void tegra_output_encoder_destroy(struct drm_encoder *encoder)
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{
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drm_encoder_cleanup(encoder);
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}
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static irqreturn_t hpd_irq(int irq, void *data)
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{
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struct tegra_output *output = data;
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if (output->connector.dev)
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drm_helper_hpd_irq_event(output->connector.dev);
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return IRQ_HANDLED;
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}
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int tegra_output_probe(struct tegra_output *output)
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{
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struct device_node *ddc, *panel;
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int err, size;
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if (!output->of_node)
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output->of_node = output->dev->of_node;
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panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
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if (panel) {
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output->panel = of_drm_find_panel(panel);
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if (!output->panel)
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return -EPROBE_DEFER;
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of_node_put(panel);
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}
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output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
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ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
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if (ddc) {
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output->ddc = of_find_i2c_adapter_by_node(ddc);
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if (!output->ddc) {
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err = -EPROBE_DEFER;
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of_node_put(ddc);
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return err;
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}
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of_node_put(ddc);
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}
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output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
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"nvidia,hpd-gpio", 0,
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&output->hpd_gpio_flags);
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if (gpio_is_valid(output->hpd_gpio)) {
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unsigned long flags;
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err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
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"HDMI hotplug detect");
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if (err < 0) {
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dev_err(output->dev, "gpio_request_one(): %d\n", err);
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return err;
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}
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err = gpio_to_irq(output->hpd_gpio);
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if (err < 0) {
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dev_err(output->dev, "gpio_to_irq(): %d\n", err);
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gpio_free(output->hpd_gpio);
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return err;
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}
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output->hpd_irq = err;
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flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
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IRQF_ONESHOT;
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err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
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flags, "hpd", output);
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if (err < 0) {
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dev_err(output->dev, "failed to request IRQ#%u: %d\n",
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output->hpd_irq, err);
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gpio_free(output->hpd_gpio);
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return err;
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}
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output->connector.polled = DRM_CONNECTOR_POLL_HPD;
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/*
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* Disable the interrupt until the connector has been
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* initialized to avoid a race in the hotplug interrupt
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* handler.
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*/
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disable_irq(output->hpd_irq);
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}
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return 0;
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}
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void tegra_output_remove(struct tegra_output *output)
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{
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if (gpio_is_valid(output->hpd_gpio)) {
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free_irq(output->hpd_irq, output);
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gpio_free(output->hpd_gpio);
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}
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if (output->ddc)
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put_device(&output->ddc->dev);
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}
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int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
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{
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int err;
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if (output->panel) {
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err = drm_panel_attach(output->panel, &output->connector);
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if (err < 0)
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return err;
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}
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/*
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* The connector is now registered and ready to receive hotplug events
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* so the hotplug interrupt can be enabled.
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*/
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if (gpio_is_valid(output->hpd_gpio))
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enable_irq(output->hpd_irq);
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return 0;
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}
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void tegra_output_exit(struct tegra_output *output)
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{
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/*
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* The connector is going away, so the interrupt must be disabled to
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* prevent the hotplug interrupt handler from potentially crashing.
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*/
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if (gpio_is_valid(output->hpd_gpio))
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disable_irq(output->hpd_irq);
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if (output->panel)
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drm_panel_detach(output->panel);
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}
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