// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2012 Avionic Design GmbH
* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
*/
#include <linux/i2c.h>
#include <linux/of.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_edid.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);
const struct drm_edid *drm_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->drm_edid)
drm_edid = drm_edid_dup(output->drm_edid);
else if (output->ddc)
drm_edid = drm_edid_read_ddc(connector, output->ddc);
drm_edid_connector_update(connector, drm_edid);
cec_notifier_set_phys_addr(output->cec,
connector->display_info.source_physical_address);
err = drm_edid_connector_add_modes(connector);
drm_edid_free(drm_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;
const void *edid;
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);
}
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;
}
}
edid = of_get_property(output->of_node, "nvidia,edid", &size);
output->drm_edid = drm_edid_alloc(edid, size);
output->hpd_gpio = devm_fwnode_gpiod_get(output->dev,
of_fwnode_handle(output->of_node),
"nvidia,hpd",
GPIOD_IN,
"HDMI hotplug detect");
if (IS_ERR(output->hpd_gpio)) {
if (PTR_ERR(output->hpd_gpio) != -ENOENT) {
err = PTR_ERR(output->hpd_gpio);
goto put_i2c;
}
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);
goto put_i2c;
}
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);
goto put_i2c;
}
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;
put_i2c:
if (output->ddc)
i2c_put_adapter(output->ddc);
drm_edid_free(output->drm_edid);
return err;
}
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);
drm_edid_free(output->drm_edid);
}
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;
}
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