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_panel.h>
  9#include <drm/drm_simple_kms_helper.h>
 10
 11#include "drm.h"
 12#include "dc.h"
 13
 14#include <media/cec-notifier.h>
 15
 16int tegra_output_connector_get_modes(struct drm_connector *connector)
 17{
 18	struct tegra_output *output = connector_to_output(connector);
 19	struct edid *edid = NULL;
 20	int err = 0;
 21
 22	/*
 23	 * If the panel provides one or more modes, use them exclusively and
 24	 * ignore any other means of obtaining a mode.
 25	 */
 26	if (output->panel) {
 27		err = drm_panel_get_modes(output->panel, connector);
 28		if (err > 0)
 29			return err;
 30	}
 31
 32	if (output->edid)
 33		edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
 34	else if (output->ddc)
 35		edid = drm_get_edid(connector, output->ddc);
 36
 37	cec_notifier_set_phys_addr_from_edid(output->cec, edid);
 38	drm_connector_update_edid_property(connector, edid);
 39
 40	if (edid) {
 41		err = drm_add_edid_modes(connector, edid);
 42		kfree(edid);
 43	}
 44
 45	return err;
 46}
 47
 48enum drm_connector_status
 49tegra_output_connector_detect(struct drm_connector *connector, bool force)
 50{
 51	struct tegra_output *output = connector_to_output(connector);
 52	enum drm_connector_status status = connector_status_unknown;
 53
 54	if (output->hpd_gpio) {
 55		if (gpiod_get_value(output->hpd_gpio) == 0)
 56			status = connector_status_disconnected;
 57		else
 58			status = connector_status_connected;
 59	} else {
 60		if (!output->panel)
 61			status = connector_status_disconnected;
 62		else
 63			status = connector_status_connected;
 64	}
 65
 66	if (status != connector_status_connected)
 67		cec_notifier_phys_addr_invalidate(output->cec);
 68
 69	return status;
 70}
 71
 72void tegra_output_connector_destroy(struct drm_connector *connector)
 73{
 74	struct tegra_output *output = connector_to_output(connector);
 75
 76	if (output->cec)
 77		cec_notifier_conn_unregister(output->cec);
 78
 79	drm_connector_unregister(connector);
 80	drm_connector_cleanup(connector);
 81}
 82
 83static irqreturn_t hpd_irq(int irq, void *data)
 84{
 85	struct tegra_output *output = data;
 86
 87	if (output->connector.dev)
 88		drm_helper_hpd_irq_event(output->connector.dev);
 89
 90	return IRQ_HANDLED;
 91}
 92
 93int tegra_output_probe(struct tegra_output *output)
 94{
 95	struct device_node *ddc, *panel;
 96	unsigned long flags;
 97	int err, size;
 98
 99	if (!output->of_node)
100		output->of_node = output->dev->of_node;
101
102	panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
103	if (panel) {
104		output->panel = of_drm_find_panel(panel);
105		if (IS_ERR(output->panel))
106			return PTR_ERR(output->panel);
107
108		of_node_put(panel);
109	}
110
111	output->edid = of_get_property(output->of_node, "nvidia,edid", &size);
112
113	ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
114	if (ddc) {
115		output->ddc = of_find_i2c_adapter_by_node(ddc);
116		if (!output->ddc) {
117			err = -EPROBE_DEFER;
118			of_node_put(ddc);
119			return err;
120		}
121
122		of_node_put(ddc);
123	}
124
125	output->hpd_gpio = devm_gpiod_get_from_of_node(output->dev,
126						       output->of_node,
127						       "nvidia,hpd-gpio", 0,
128						       GPIOD_IN,
129						       "HDMI hotplug detect");
130	if (IS_ERR(output->hpd_gpio)) {
131		if (PTR_ERR(output->hpd_gpio) != -ENOENT)
132			return PTR_ERR(output->hpd_gpio);
133
134		output->hpd_gpio = NULL;
135	}
136
137	if (output->hpd_gpio) {
138		err = gpiod_to_irq(output->hpd_gpio);
139		if (err < 0) {
140			dev_err(output->dev, "gpiod_to_irq(): %d\n", err);
141			return err;
142		}
143
144		output->hpd_irq = err;
145
146		flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
147			IRQF_ONESHOT;
148
149		err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
150					   flags, "hpd", output);
151		if (err < 0) {
152			dev_err(output->dev, "failed to request IRQ#%u: %d\n",
153				output->hpd_irq, err);
154			return err;
155		}
156
157		output->connector.polled = DRM_CONNECTOR_POLL_HPD;
158
159		/*
160		 * Disable the interrupt until the connector has been
161		 * initialized to avoid a race in the hotplug interrupt
162		 * handler.
163		 */
164		disable_irq(output->hpd_irq);
165	}
166
167	return 0;
168}
169
170void tegra_output_remove(struct tegra_output *output)
171{
172	if (output->hpd_gpio)
173		free_irq(output->hpd_irq, output);
174
175	if (output->ddc)
176		put_device(&output->ddc->dev);
177}
178
179int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
180{
181	int connector_type;
182	int err;
183
184	if (output->panel) {
185		err = drm_panel_attach(output->panel, &output->connector);
186		if (err < 0)
187			return err;
188	}
189
190	/*
191	 * The connector is now registered and ready to receive hotplug events
192	 * so the hotplug interrupt can be enabled.
193	 */
194	if (output->hpd_gpio)
195		enable_irq(output->hpd_irq);
196
197	connector_type = output->connector.connector_type;
198	/*
199	 * Create a CEC notifier for HDMI connector.
200	 */
201	if (connector_type == DRM_MODE_CONNECTOR_HDMIA ||
202	    connector_type == DRM_MODE_CONNECTOR_HDMIB) {
203		struct cec_connector_info conn_info;
204
205		cec_fill_conn_info_from_drm(&conn_info, &output->connector);
206		output->cec = cec_notifier_conn_register(output->dev, NULL,
207							 &conn_info);
208		if (!output->cec)
209			return -ENOMEM;
210	}
211
212	return 0;
213}
214
215void tegra_output_exit(struct tegra_output *output)
216{
217	/*
218	 * The connector is going away, so the interrupt must be disabled to
219	 * prevent the hotplug interrupt handler from potentially crashing.
220	 */
221	if (output->hpd_gpio)
222		disable_irq(output->hpd_irq);
223
224	if (output->panel)
225		drm_panel_detach(output->panel);
226}
227
228void tegra_output_find_possible_crtcs(struct tegra_output *output,
229				      struct drm_device *drm)
230{
231	struct device *dev = output->dev;
232	struct drm_crtc *crtc;
233	unsigned int mask = 0;
234
235	drm_for_each_crtc(crtc, drm) {
236		struct tegra_dc *dc = to_tegra_dc(crtc);
237
238		if (tegra_dc_has_output(dc, dev))
239			mask |= drm_crtc_mask(crtc);
240	}
241
242	if (mask == 0) {
243		dev_warn(dev, "missing output definition for heads in DT\n");
244		mask = 0x3;
245	}
246
247	output->encoder.possible_crtcs = mask;
248}
249
250int tegra_output_suspend(struct tegra_output *output)
251{
252	if (output->hpd_irq)
253		disable_irq(output->hpd_irq);
254
255	return 0;
256}
257
258int tegra_output_resume(struct tegra_output *output)
259{
260	if (output->hpd_irq)
261		enable_irq(output->hpd_irq);
262
263	return 0;
264}