zynqmp_dpsub.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * ZynqMP DisplayPort Subsystem Driver
  4 *
  5 * Copyright (C) 2017 - 2020 Xilinx, Inc.
  6 *
  7 * Authors:
  8 * - Hyun Woo Kwon <hyun.kwon@xilinx.com>
  9 * - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 10 */
 11
 12#include <linux/clk.h>
 13#include <linux/dma-mapping.h>
 14#include <linux/module.h>
 15#include <linux/of_graph.h>
 16#include <linux/of_reserved_mem.h>
 17#include <linux/platform_device.h>
 18#include <linux/pm_runtime.h>
 19#include <linux/slab.h>
 20
 21#include <drm/drm_atomic_helper.h>
 22#include <drm/drm_bridge.h>
 23#include <drm/drm_modeset_helper.h>
 24#include <drm/drm_module.h>
 25
 26#include "zynqmp_disp.h"
 27#include "zynqmp_dp.h"
 28#include "zynqmp_dpsub.h"
 29#include "zynqmp_kms.h"
 30
 31/* -----------------------------------------------------------------------------
 32 * Power Management
 33 */
 34
 35static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev)
 36{
 37	struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
 38
 39	if (!dpsub->drm)
 40		return 0;
 41
 42	return drm_mode_config_helper_suspend(&dpsub->drm->dev);
 43}
 44
 45static int __maybe_unused zynqmp_dpsub_resume(struct device *dev)
 46{
 47	struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
 48
 49	if (!dpsub->drm)
 50		return 0;
 51
 52	return drm_mode_config_helper_resume(&dpsub->drm->dev);
 53}
 54
 55static const struct dev_pm_ops zynqmp_dpsub_pm_ops = {
 56	SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume)
 57};
 58
 59/* -----------------------------------------------------------------------------
 60 * Probe & Remove
 61 */
 62
 63static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub)
 64{
 65	int ret;
 66
 67	dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk");
 68	if (IS_ERR(dpsub->apb_clk))
 69		return PTR_ERR(dpsub->apb_clk);
 70
 71	ret = clk_prepare_enable(dpsub->apb_clk);
 72	if (ret) {
 73		dev_err(dpsub->dev, "failed to enable the APB clock\n");
 74		return ret;
 75	}
 76
 77	/*
 78	 * Try the live PL video clock, and fall back to the PS clock if the
 79	 * live PL video clock isn't valid.
 80	 */
 81	dpsub->vid_clk = devm_clk_get(dpsub->dev, "dp_live_video_in_clk");
 82	if (!IS_ERR(dpsub->vid_clk))
 83		dpsub->vid_clk_from_ps = false;
 84	else if (PTR_ERR(dpsub->vid_clk) == -EPROBE_DEFER)
 85		return PTR_ERR(dpsub->vid_clk);
 86
 87	if (IS_ERR_OR_NULL(dpsub->vid_clk)) {
 88		dpsub->vid_clk = devm_clk_get(dpsub->dev, "dp_vtc_pixel_clk_in");
 89		if (IS_ERR(dpsub->vid_clk)) {
 90			dev_err(dpsub->dev, "failed to init any video clock\n");
 91			return PTR_ERR(dpsub->vid_clk);
 92		}
 93		dpsub->vid_clk_from_ps = true;
 94	}
 95
 96	/*
 97	 * Try the live PL audio clock, and fall back to the PS clock if the
 98	 * live PL audio clock isn't valid. Missing audio clock disables audio
 99	 * but isn't an error.
100	 */
101	dpsub->aud_clk = devm_clk_get(dpsub->dev, "dp_live_audio_aclk");
102	if (!IS_ERR(dpsub->aud_clk)) {
103		dpsub->aud_clk_from_ps = false;
104		return 0;
105	}
106
107	dpsub->aud_clk = devm_clk_get(dpsub->dev, "dp_aud_clk");
108	if (!IS_ERR(dpsub->aud_clk)) {
109		dpsub->aud_clk_from_ps = true;
110		return 0;
111	}
112
113	dev_info(dpsub->dev, "audio disabled due to missing clock\n");
114	return 0;
115}
116
117static int zynqmp_dpsub_parse_dt(struct zynqmp_dpsub *dpsub)
118{
119	struct device_node *np;
120	unsigned int i;
121
122	/*
123	 * For backward compatibility with old device trees that don't contain
124	 * ports, consider that only the DP output port is connected if no
125	 * ports child no exists.
126	 */
127	np = of_get_child_by_name(dpsub->dev->of_node, "ports");
128	of_node_put(np);
129	if (!np) {
130		dev_warn(dpsub->dev, "missing ports, update DT bindings\n");
131		dpsub->connected_ports = BIT(ZYNQMP_DPSUB_PORT_OUT_DP);
132		dpsub->dma_enabled = true;
133		return 0;
134	}
135
136	/* Check which ports are connected. */
137	for (i = 0; i < ZYNQMP_DPSUB_NUM_PORTS; ++i) {
138		struct device_node *np;
139
140		np = of_graph_get_remote_node(dpsub->dev->of_node, i, -1);
141		if (np) {
142			dpsub->connected_ports |= BIT(i);
143			of_node_put(np);
144		}
145	}
146
147	/* Sanity checks. */
148	if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) &&
149	    (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) {
150		dev_err(dpsub->dev, "only one live video input is supported\n");
151		return -EINVAL;
152	}
153
154	if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) ||
155	    (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) {
156		if (dpsub->vid_clk_from_ps) {
157			dev_err(dpsub->dev,
158				"live video input requires PL clock\n");
159			return -EINVAL;
160		}
161	} else {
162		dpsub->dma_enabled = true;
163	}
164
165	if (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_AUDIO))
166		dev_warn(dpsub->dev, "live audio unsupported, ignoring\n");
167
168	if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_VIDEO)) ||
169	    (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_AUDIO)))
170		dev_warn(dpsub->dev, "output to PL unsupported, ignoring\n");
171
172	if (!(dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_DP))) {
173		dev_err(dpsub->dev, "DP output port not connected\n");
174		return -EINVAL;
175	}
176
177	return 0;
178}
179
180void zynqmp_dpsub_release(struct zynqmp_dpsub *dpsub)
181{
182	kfree(dpsub->disp);
183	kfree(dpsub);
184}
185
186static int zynqmp_dpsub_probe(struct platform_device *pdev)
187{
188	struct zynqmp_dpsub *dpsub;
189	int ret;
190
191	/* Allocate private data. */
192	dpsub = kzalloc(sizeof(*dpsub), GFP_KERNEL);
193	if (!dpsub)
194		return -ENOMEM;
195
196	dpsub->dev = &pdev->dev;
197	platform_set_drvdata(pdev, dpsub);
198
199	ret = dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT));
200	if (ret)
201		return ret;
202
203	dma_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(32));
204
205	/* Try the reserved memory. Proceed if there's none. */
206	of_reserved_mem_device_init(&pdev->dev);
207
208	ret = zynqmp_dpsub_init_clocks(dpsub);
209	if (ret < 0)
210		goto err_mem;
211
212	ret = zynqmp_dpsub_parse_dt(dpsub);
213	if (ret < 0)
214		goto err_mem;
215
216	pm_runtime_enable(&pdev->dev);
217
218	/*
219	 * DP should be probed first so that the zynqmp_disp can set the output
220	 * format accordingly.
221	 */
222	ret = zynqmp_dp_probe(dpsub);
223	if (ret)
224		goto err_pm;
225
226	ret = zynqmp_disp_probe(dpsub);
227	if (ret)
228		goto err_dp;
229
230	drm_bridge_add(dpsub->bridge);
231
232	if (dpsub->dma_enabled) {
233		ret = zynqmp_dpsub_drm_init(dpsub);
234		if (ret)
235			goto err_disp;
236	}
237
238	ret = zynqmp_audio_init(dpsub);
239	if (ret)
240		goto err_drm_cleanup;
241
242	dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed");
243
244	return 0;
245
246err_drm_cleanup:
247	if (dpsub->drm)
248		zynqmp_dpsub_drm_cleanup(dpsub);
249err_disp:
250	drm_bridge_remove(dpsub->bridge);
251	zynqmp_disp_remove(dpsub);
252err_dp:
253	zynqmp_dp_remove(dpsub);
254err_pm:
255	pm_runtime_disable(&pdev->dev);
256	clk_disable_unprepare(dpsub->apb_clk);
257err_mem:
258	of_reserved_mem_device_release(&pdev->dev);
259	if (!dpsub->drm)
260		zynqmp_dpsub_release(dpsub);
261	return ret;
262}
263
264static void zynqmp_dpsub_remove(struct platform_device *pdev)
265{
266	struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
267
268	zynqmp_audio_uninit(dpsub);
269
270	if (dpsub->drm)
271		zynqmp_dpsub_drm_cleanup(dpsub);
272
273	drm_bridge_remove(dpsub->bridge);
274	zynqmp_disp_remove(dpsub);
275	zynqmp_dp_remove(dpsub);
276
277	pm_runtime_disable(&pdev->dev);
278	clk_disable_unprepare(dpsub->apb_clk);
279	of_reserved_mem_device_release(&pdev->dev);
280
281	if (!dpsub->drm)
282		zynqmp_dpsub_release(dpsub);
283}
284
285static void zynqmp_dpsub_shutdown(struct platform_device *pdev)
286{
287	struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
288
289	if (!dpsub->drm)
290		return;
291
292	drm_atomic_helper_shutdown(&dpsub->drm->dev);
293}
294
295static const struct of_device_id zynqmp_dpsub_of_match[] = {
296	{ .compatible = "xlnx,zynqmp-dpsub-1.7", },
297	{ /* end of table */ },
298};
299MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match);
300
301static struct platform_driver zynqmp_dpsub_driver = {
302	.probe			= zynqmp_dpsub_probe,
303	.remove			= zynqmp_dpsub_remove,
304	.shutdown		= zynqmp_dpsub_shutdown,
305	.driver			= {
306		.name		= "zynqmp-dpsub",
307		.pm		= &zynqmp_dpsub_pm_ops,
308		.of_match_table	= zynqmp_dpsub_of_match,
309	},
310};
311
312drm_module_platform_driver(zynqmp_dpsub_driver);
313
314MODULE_AUTHOR("Xilinx, Inc.");
315MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver");
316MODULE_LICENSE("GPL v2");