summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/xlnx/zynqmp_dpsub.c
blob: 88eb33acd5f0dd4f98ed60343480f4258f65e798 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
// SPDX-License-Identifier: GPL-2.0
/*
 * ZynqMP DisplayPort Subsystem Driver
 *
 * Copyright (C) 2017 - 2020 Xilinx, Inc.
 *
 * Authors:
 * - Hyun Woo Kwon <hyun.kwon@xilinx.com>
 * - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 */

#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_modeset_helper.h>
#include <drm/drm_module.h>

#include "zynqmp_disp.h"
#include "zynqmp_dp.h"
#include "zynqmp_dpsub.h"
#include "zynqmp_kms.h"

/* -----------------------------------------------------------------------------
 * Power Management
 */

static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev)
{
	struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);

	if (!dpsub->drm)
		return 0;

	return drm_mode_config_helper_suspend(&dpsub->drm->dev);
}

static int __maybe_unused zynqmp_dpsub_resume(struct device *dev)
{
	struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);

	if (!dpsub->drm)
		return 0;

	return drm_mode_config_helper_resume(&dpsub->drm->dev);
}

static const struct dev_pm_ops zynqmp_dpsub_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume)
};

/* -----------------------------------------------------------------------------
 * DPSUB Configuration
 */

/**
 * zynqmp_dpsub_audio_enabled - If the audio is enabled
 * @dpsub: DisplayPort subsystem
 *
 * Return if the audio is enabled depending on the audio clock.
 *
 * Return: true if audio is enabled, or false.
 */
bool zynqmp_dpsub_audio_enabled(struct zynqmp_dpsub *dpsub)
{
	return !!dpsub->aud_clk;
}

/**
 * zynqmp_dpsub_get_audio_clk_rate - Get the current audio clock rate
 * @dpsub: DisplayPort subsystem
 *
 * Return: the current audio clock rate.
 */
unsigned int zynqmp_dpsub_get_audio_clk_rate(struct zynqmp_dpsub *dpsub)
{
	if (zynqmp_dpsub_audio_enabled(dpsub))
		return 0;
	return clk_get_rate(dpsub->aud_clk);
}

/* -----------------------------------------------------------------------------
 * Probe & Remove
 */

static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub)
{
	int ret;

	dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk");
	if (IS_ERR(dpsub->apb_clk))
		return PTR_ERR(dpsub->apb_clk);

	ret = clk_prepare_enable(dpsub->apb_clk);
	if (ret) {
		dev_err(dpsub->dev, "failed to enable the APB clock\n");
		return ret;
	}

	/*
	 * Try the live PL video clock, and fall back to the PS clock if the
	 * live PL video clock isn't valid.
	 */
	dpsub->vid_clk = devm_clk_get(dpsub->dev, "dp_live_video_in_clk");
	if (!IS_ERR(dpsub->vid_clk))
		dpsub->vid_clk_from_ps = false;
	else if (PTR_ERR(dpsub->vid_clk) == -EPROBE_DEFER)
		return PTR_ERR(dpsub->vid_clk);

	if (IS_ERR_OR_NULL(dpsub->vid_clk)) {
		dpsub->vid_clk = devm_clk_get(dpsub->dev, "dp_vtc_pixel_clk_in");
		if (IS_ERR(dpsub->vid_clk)) {
			dev_err(dpsub->dev, "failed to init any video clock\n");
			return PTR_ERR(dpsub->vid_clk);
		}
		dpsub->vid_clk_from_ps = true;
	}

	/*
	 * Try the live PL audio clock, and fall back to the PS clock if the
	 * live PL audio clock isn't valid. Missing audio clock disables audio
	 * but isn't an error.
	 */
	dpsub->aud_clk = devm_clk_get(dpsub->dev, "dp_live_audio_aclk");
	if (!IS_ERR(dpsub->aud_clk)) {
		dpsub->aud_clk_from_ps = false;
		return 0;
	}

	dpsub->aud_clk = devm_clk_get(dpsub->dev, "dp_aud_clk");
	if (!IS_ERR(dpsub->aud_clk)) {
		dpsub->aud_clk_from_ps = true;
		return 0;
	}

	dev_info(dpsub->dev, "audio disabled due to missing clock\n");
	return 0;
}

static int zynqmp_dpsub_parse_dt(struct zynqmp_dpsub *dpsub)
{
	struct device_node *np;
	unsigned int i;

	/*
	 * For backward compatibility with old device trees that don't contain
	 * ports, consider that only the DP output port is connected if no
	 * ports child no exists.
	 */
	np = of_get_child_by_name(dpsub->dev->of_node, "ports");
	of_node_put(np);
	if (!np) {
		dev_warn(dpsub->dev, "missing ports, update DT bindings\n");
		dpsub->connected_ports = BIT(ZYNQMP_DPSUB_PORT_OUT_DP);
		dpsub->dma_enabled = true;
		return 0;
	}

	/* Check which ports are connected. */
	for (i = 0; i < ZYNQMP_DPSUB_NUM_PORTS; ++i) {
		struct device_node *np;

		np = of_graph_get_remote_node(dpsub->dev->of_node, i, -1);
		if (np) {
			dpsub->connected_ports |= BIT(i);
			of_node_put(np);
		}
	}

	/* Sanity checks. */
	if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) &&
	    (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) {
		dev_err(dpsub->dev, "only one live video input is supported\n");
		return -EINVAL;
	}

	if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) ||
	    (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) {
		if (dpsub->vid_clk_from_ps) {
			dev_err(dpsub->dev,
				"live video input requires PL clock\n");
			return -EINVAL;
		}
	} else {
		dpsub->dma_enabled = true;
	}

	if (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_AUDIO))
		dev_warn(dpsub->dev, "live audio unsupported, ignoring\n");

	if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_VIDEO)) ||
	    (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_AUDIO)))
		dev_warn(dpsub->dev, "output to PL unsupported, ignoring\n");

	if (!(dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_DP))) {
		dev_err(dpsub->dev, "DP output port not connected\n");
		return -EINVAL;
	}

	return 0;
}

void zynqmp_dpsub_release(struct zynqmp_dpsub *dpsub)
{
	kfree(dpsub->disp);
	kfree(dpsub->dp);
	kfree(dpsub);
}

static int zynqmp_dpsub_probe(struct platform_device *pdev)
{
	struct zynqmp_dpsub *dpsub;
	int ret;

	/* Allocate private data. */
	dpsub = kzalloc(sizeof(*dpsub), GFP_KERNEL);
	if (!dpsub)
		return -ENOMEM;

	dpsub->dev = &pdev->dev;
	platform_set_drvdata(pdev, dpsub);

	ret = dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT));
	if (ret)
		return ret;

	/* Try the reserved memory. Proceed if there's none. */
	of_reserved_mem_device_init(&pdev->dev);

	ret = zynqmp_dpsub_init_clocks(dpsub);
	if (ret < 0)
		goto err_mem;

	ret = zynqmp_dpsub_parse_dt(dpsub);
	if (ret < 0)
		goto err_mem;

	pm_runtime_enable(&pdev->dev);

	/*
	 * DP should be probed first so that the zynqmp_disp can set the output
	 * format accordingly.
	 */
	ret = zynqmp_dp_probe(dpsub);
	if (ret)
		goto err_pm;

	ret = zynqmp_disp_probe(dpsub);
	if (ret)
		goto err_dp;

	if (dpsub->dma_enabled) {
		ret = zynqmp_dpsub_drm_init(dpsub);
		if (ret)
			goto err_disp;
	} else {
		drm_bridge_add(dpsub->bridge);
	}

	dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed");

	return 0;

err_disp:
	zynqmp_disp_remove(dpsub);
err_dp:
	zynqmp_dp_remove(dpsub);
err_pm:
	pm_runtime_disable(&pdev->dev);
	clk_disable_unprepare(dpsub->apb_clk);
err_mem:
	of_reserved_mem_device_release(&pdev->dev);
	if (!dpsub->drm)
		zynqmp_dpsub_release(dpsub);
	return ret;
}

static void zynqmp_dpsub_remove(struct platform_device *pdev)
{
	struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);

	if (dpsub->drm)
		zynqmp_dpsub_drm_cleanup(dpsub);
	else
		drm_bridge_remove(dpsub->bridge);

	zynqmp_disp_remove(dpsub);
	zynqmp_dp_remove(dpsub);

	pm_runtime_disable(&pdev->dev);
	clk_disable_unprepare(dpsub->apb_clk);
	of_reserved_mem_device_release(&pdev->dev);

	if (!dpsub->drm)
		zynqmp_dpsub_release(dpsub);
}

static void zynqmp_dpsub_shutdown(struct platform_device *pdev)
{
	struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);

	if (!dpsub->drm)
		return;

	drm_atomic_helper_shutdown(&dpsub->drm->dev);
}

static const struct of_device_id zynqmp_dpsub_of_match[] = {
	{ .compatible = "xlnx,zynqmp-dpsub-1.7", },
	{ /* end of table */ },
};
MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match);

static struct platform_driver zynqmp_dpsub_driver = {
	.probe			= zynqmp_dpsub_probe,
	.remove_new		= zynqmp_dpsub_remove,
	.shutdown		= zynqmp_dpsub_shutdown,
	.driver			= {
		.name		= "zynqmp-dpsub",
		.pm		= &zynqmp_dpsub_pm_ops,
		.of_match_table	= zynqmp_dpsub_of_match,
	},
};

drm_module_platform_driver(zynqmp_dpsub_driver);

MODULE_AUTHOR("Xilinx, Inc.");
MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver");
MODULE_LICENSE("GPL v2");