1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2012 Avionic Design GmbH
  4 * Copyright (C) 2012 NVIDIA CORPORATION.  All rights reserved.
  5 */
  6
  7#include <drm/drm_atomic_helper.h>
  8#include <drm/drm_of.h>
  9#include <drm/drm_panel.h>
 10#include <drm/drm_simple_kms_helper.h>
 11
 12#include "drm.h"
 13#include "dc.h"
 14
 15#include <media/cec-notifier.h>
 16
 17int tegra_output_connector_get_modes(struct drm_connector *connector)
 18{
 19	struct tegra_output *output = connector_to_output(connector);
 20	struct edid *edid = NULL;
 21	int err = 0;
 22
 23	/*
 24	 * If the panel provides one or more modes, use them exclusively and
 25	 * ignore any other means of obtaining a mode.
 26	 */
 27	if (output->panel) {
 28		err = drm_panel_get_modes(output->panel, connector);
 29		if (err > 0)
 30			return err;
 31	}
 32
 33	if (output->edid)
 34		edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
 35	else if (output->ddc)
 36		edid = drm_get_edid(connector, output->ddc);
 37
 38	cec_notifier_set_phys_addr_from_edid(output->cec, edid);
 39	drm_connector_update_edid_property(connector, edid);
 40
 41	if (edid) {
 42		err = drm_add_edid_modes(connector, edid);
 43		kfree(edid);
 44	}
 45
 46	return err;
 47}
 48
 49enum drm_connector_status
 50tegra_output_connector_detect(struct drm_connector *connector, bool force)
 51{
 52	struct tegra_output *output = connector_to_output(connector);
 53	enum drm_connector_status status = connector_status_unknown;
 54
 55	if (output->hpd_gpio) {
 56		if (gpiod_get_value(output->hpd_gpio) == 0)
 57			status = connector_status_disconnected;
 58		else
 59			status = connector_status_connected;
 60	} else {
 61		if (!output->panel)
 62			status = connector_status_disconnected;
 63		else
 64			status = connector_status_connected;
 65	}
 66
 67	if (status != connector_status_connected)
 68		cec_notifier_phys_addr_invalidate(output->cec);
 69
 70	return status;
 71}
 72
 73void tegra_output_connector_destroy(struct drm_connector *connector)
 74{
 75	struct tegra_output *output = connector_to_output(connector);
 76
 77	if (output->cec)
 78		cec_notifier_conn_unregister(output->cec);
 79
 80	drm_connector_unregister(connector);
 81	drm_connector_cleanup(connector);
 82}
 83
 84static irqreturn_t hpd_irq(int irq, void *data)
 85{
 86	struct tegra_output *output = data;
 87
 88	if (output->connector.dev)
 89		drm_helper_hpd_irq_event(output->connector.dev);
 90
 91	return IRQ_HANDLED;
 92}
 93
 94int tegra_output_probe(struct tegra_output *output)
 95{
 96	struct device_node *ddc, *panel;
 97	unsigned long flags;
 98	int err, size;
 99
100	if (!output->of_node)
101		output->of_node = output->dev->of_node;
102
103	err = drm_of_find_panel_or_bridge(output->of_node, -1, -1,
104					  &output->panel, &output->bridge);
105	if (err && err != -ENODEV)
106		return err;
107
108	panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
109	if (panel) {
110		/*
111		 * Don't mix nvidia,panel phandle with the graph in a
112		 * device-tree.
113		 */
114		WARN_ON(output->panel || output->bridge);
115
116		output->panel = of_drm_find_panel(panel);
117		of_node_put(panel);
118
119		if (IS_ERR(output->panel))
120			return PTR_ERR(output->panel);
121	}
122
123	output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
124
125	ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
126	if (ddc) {
127		output->ddc = of_get_i2c_adapter_by_node(ddc);
128		of_node_put(ddc);
129
130		if (!output->ddc) {
131			err = -EPROBE_DEFER;
132			return err;
133		}
134	}
135
136	output->hpd_gpio = devm_fwnode_gpiod_get(output->dev,
137					of_fwnode_handle(output->of_node),
138					"nvidia,hpd",
139					GPIOD_IN,
140					"HDMI hotplug detect");
141	if (IS_ERR(output->hpd_gpio)) {
142		if (PTR_ERR(output->hpd_gpio) != -ENOENT)
143			return PTR_ERR(output->hpd_gpio);
144
145		output->hpd_gpio = NULL;
146	}
147
148	if (output->hpd_gpio) {
149		err = gpiod_to_irq(output->hpd_gpio);
150		if (err < 0) {
151			dev_err(output->dev, "gpiod_to_irq(): %d\n", err);
152			return err;
153		}
154
155		output->hpd_irq = err;
156
157		flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
158			IRQF_ONESHOT;
159
160		err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
161					   flags, "hpd", output);
162		if (err < 0) {
163			dev_err(output->dev, "failed to request IRQ#%u: %d\n",
164				output->hpd_irq, err);
165			return err;
166		}
167
168		output->connector.polled = DRM_CONNECTOR_POLL_HPD;
169
170		/*
171		 * Disable the interrupt until the connector has been
172		 * initialized to avoid a race in the hotplug interrupt
173		 * handler.
174		 */
175		disable_irq(output->hpd_irq);
176	}
177
178	return 0;
179}
180
181void tegra_output_remove(struct tegra_output *output)
182{
183	if (output->hpd_gpio)
184		free_irq(output->hpd_irq, output);
185
186	if (output->ddc)
187		i2c_put_adapter(output->ddc);
188}
189
190int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
191{
192	int connector_type;
193
194	/*
195	 * The connector is now registered and ready to receive hotplug events
196	 * so the hotplug interrupt can be enabled.
197	 */
198	if (output->hpd_gpio)
199		enable_irq(output->hpd_irq);
200
201	connector_type = output->connector.connector_type;
202	/*
203	 * Create a CEC notifier for HDMI connector.
204	 */
205	if (connector_type == DRM_MODE_CONNECTOR_HDMIA ||
206	    connector_type == DRM_MODE_CONNECTOR_HDMIB) {
207		struct cec_connector_info conn_info;
208
209		cec_fill_conn_info_from_drm(&conn_info, &output->connector);
210		output->cec = cec_notifier_conn_register(output->dev, NULL,
211							 &conn_info);
212		if (!output->cec)
213			return -ENOMEM;
214	}
215
216	return 0;
217}
218
219void tegra_output_exit(struct tegra_output *output)
220{
221	/*
222	 * The connector is going away, so the interrupt must be disabled to
223	 * prevent the hotplug interrupt handler from potentially crashing.
224	 */
225	if (output->hpd_gpio)
226		disable_irq(output->hpd_irq);
227}
228
229void tegra_output_find_possible_crtcs(struct tegra_output *output,
230				      struct drm_device *drm)
231{
232	struct device *dev = output->dev;
233	struct drm_crtc *crtc;
234	unsigned int mask = 0;
235
236	drm_for_each_crtc(crtc, drm) {
237		struct tegra_dc *dc = to_tegra_dc(crtc);
238
239		if (tegra_dc_has_output(dc, dev))
240			mask |= drm_crtc_mask(crtc);
241	}
242
243	if (mask == 0) {
244		dev_warn(dev, "missing output definition for heads in DT\n");
245		mask = 0x3;
246	}
247
248	output->encoder.possible_crtcs = mask;
249}
250
251int tegra_output_suspend(struct tegra_output *output)
252{
253	if (output->hpd_irq)
254		disable_irq(output->hpd_irq);
255
256	return 0;
257}
258
259int tegra_output_resume(struct tegra_output *output)
260{
261	if (output->hpd_irq)
262		enable_irq(output->hpd_irq);
263
264	return 0;
265}