diff options
Diffstat (limited to 'drivers/gpu/drm/tegra/output.c')
| -rw-r--r-- | drivers/gpu/drm/tegra/output.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tegra/output.c b/drivers/gpu/drm/tegra/output.c new file mode 100644 index 000000000..37db47975 --- /dev/null +++ b/drivers/gpu/drm/tegra/output.c @@ -0,0 +1,218 @@ +/* + * 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); +} |