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