diff options
Diffstat (limited to 'drivers/gpu/drm/tegra/output.c')
| -rw-r--r-- | drivers/gpu/drm/tegra/output.c | 265 |
1 files changed, 265 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..47d26b5d9 --- /dev/null +++ b/drivers/gpu/drm/tegra/output.c @@ -0,0 +1,265 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2012 Avionic Design GmbH + * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. + */ + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_of.h> +#include <drm/drm_panel.h> +#include <drm/drm_simple_kms_helper.h> + +#include "drm.h" +#include "dc.h" + +#include <media/cec-notifier.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 = drm_panel_get_modes(output->panel, connector); + 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); + + cec_notifier_set_phys_addr_from_edid(output->cec, edid); + drm_connector_update_edid_property(connector, edid); + + if (edid) { + err = drm_add_edid_modes(connector, edid); + kfree(edid); + } + + return err; +} + +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 (output->hpd_gpio) { + if (gpiod_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; + } + + if (status != connector_status_connected) + cec_notifier_phys_addr_invalidate(output->cec); + + return status; +} + +void tegra_output_connector_destroy(struct drm_connector *connector) +{ + struct tegra_output *output = connector_to_output(connector); + + if (output->cec) + cec_notifier_conn_unregister(output->cec); + + drm_connector_unregister(connector); + drm_connector_cleanup(connector); +} + +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; + unsigned long flags; + int err, size; + + if (!output->of_node) + output->of_node = output->dev->of_node; + + err = drm_of_find_panel_or_bridge(output->of_node, -1, -1, + &output->panel, &output->bridge); + if (err && err != -ENODEV) + return err; + + panel = of_parse_phandle(output->of_node, "nvidia,panel", 0); + if (panel) { + /* + * Don't mix nvidia,panel phandle with the graph in a + * device-tree. + */ + WARN_ON(output->panel || output->bridge); + + output->panel = of_drm_find_panel(panel); + of_node_put(panel); + + if (IS_ERR(output->panel)) + return PTR_ERR(output->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_get_i2c_adapter_by_node(ddc); + of_node_put(ddc); + + if (!output->ddc) { + err = -EPROBE_DEFER; + return err; + } + } + + output->hpd_gpio = devm_gpiod_get_from_of_node(output->dev, + output->of_node, + "nvidia,hpd-gpio", 0, + GPIOD_IN, + "HDMI hotplug detect"); + if (IS_ERR(output->hpd_gpio)) { + if (PTR_ERR(output->hpd_gpio) != -ENOENT) + return PTR_ERR(output->hpd_gpio); + + output->hpd_gpio = NULL; + } + + if (output->hpd_gpio) { + err = gpiod_to_irq(output->hpd_gpio); + if (err < 0) { + dev_err(output->dev, "gpiod_to_irq(): %d\n", err); + 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); + 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 (output->hpd_gpio) + free_irq(output->hpd_irq, output); + + if (output->ddc) + i2c_put_adapter(output->ddc); +} + +int tegra_output_init(struct drm_device *drm, struct tegra_output *output) +{ + int connector_type; + + /* + * The connector is now registered and ready to receive hotplug events + * so the hotplug interrupt can be enabled. + */ + if (output->hpd_gpio) + enable_irq(output->hpd_irq); + + connector_type = output->connector.connector_type; + /* + * Create a CEC notifier for HDMI connector. + */ + if (connector_type == DRM_MODE_CONNECTOR_HDMIA || + connector_type == DRM_MODE_CONNECTOR_HDMIB) { + struct cec_connector_info conn_info; + + cec_fill_conn_info_from_drm(&conn_info, &output->connector); + output->cec = cec_notifier_conn_register(output->dev, NULL, + &conn_info); + if (!output->cec) + return -ENOMEM; + } + + 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 (output->hpd_gpio) + disable_irq(output->hpd_irq); +} + +void tegra_output_find_possible_crtcs(struct tegra_output *output, + struct drm_device *drm) +{ + struct device *dev = output->dev; + struct drm_crtc *crtc; + unsigned int mask = 0; + + drm_for_each_crtc(crtc, drm) { + struct tegra_dc *dc = to_tegra_dc(crtc); + + if (tegra_dc_has_output(dc, dev)) + mask |= drm_crtc_mask(crtc); + } + + if (mask == 0) { + dev_warn(dev, "missing output definition for heads in DT\n"); + mask = 0x3; + } + + output->encoder.possible_crtcs = mask; +} + +int tegra_output_suspend(struct tegra_output *output) +{ + if (output->hpd_irq) + disable_irq(output->hpd_irq); + + return 0; +} + +int tegra_output_resume(struct tegra_output *output) +{ + if (output->hpd_irq) + enable_irq(output->hpd_irq); + + return 0; +} |