1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2018 Jernej Skrabec <jernej.skrabec@siol.net>
4  */
5 
6 #include <linux/component.h>
7 #include <linux/module.h>
8 #include <linux/of_device.h>
9 #include <linux/platform_device.h>
10 
11 #include <drm/drm_crtc_helper.h>
12 #include <drm/drm_of.h>
13 #include <drm/drm_simple_kms_helper.h>
14 
15 #include "sun8i_dw_hdmi.h"
16 #include "sun8i_tcon_top.h"
17 
18 static void sun8i_dw_hdmi_encoder_mode_set(struct drm_encoder *encoder,
19 					   struct drm_display_mode *mode,
20 					   struct drm_display_mode *adj_mode)
21 {
22 	struct sun8i_dw_hdmi *hdmi = encoder_to_sun8i_dw_hdmi(encoder);
23 
24 	clk_set_rate(hdmi->clk_tmds, mode->crtc_clock * 1000);
25 }
26 
27 static const struct drm_encoder_helper_funcs
28 sun8i_dw_hdmi_encoder_helper_funcs = {
29 	.mode_set = sun8i_dw_hdmi_encoder_mode_set,
30 };
31 
32 static enum drm_mode_status
33 sun8i_dw_hdmi_mode_valid_a83t(struct dw_hdmi *hdmi, void *data,
34 			      const struct drm_display_info *info,
35 			      const struct drm_display_mode *mode)
36 {
37 	if (mode->clock > 297000)
38 		return MODE_CLOCK_HIGH;
39 
40 	return MODE_OK;
41 }
42 
43 static enum drm_mode_status
44 sun8i_dw_hdmi_mode_valid_h6(struct dw_hdmi *hdmi, void *data,
45 			    const struct drm_display_info *info,
46 			    const struct drm_display_mode *mode)
47 {
48 	/*
49 	 * Controller support maximum of 594 MHz, which correlates to
50 	 * 4K@60Hz 4:4:4 or RGB.
51 	 */
52 	if (mode->clock > 594000)
53 		return MODE_CLOCK_HIGH;
54 
55 	return MODE_OK;
56 }
57 
58 static bool sun8i_dw_hdmi_node_is_tcon_top(struct device_node *node)
59 {
60 	return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
61 		!!of_match_node(sun8i_tcon_top_of_table, node);
62 }
63 
64 static u32 sun8i_dw_hdmi_find_possible_crtcs(struct drm_device *drm,
65 					     struct device_node *node)
66 {
67 	struct device_node *port, *ep, *remote, *remote_port;
68 	u32 crtcs = 0;
69 
70 	remote = of_graph_get_remote_node(node, 0, -1);
71 	if (!remote)
72 		return 0;
73 
74 	if (sun8i_dw_hdmi_node_is_tcon_top(remote)) {
75 		port = of_graph_get_port_by_id(remote, 4);
76 		if (!port)
77 			goto crtcs_exit;
78 
79 		for_each_child_of_node(port, ep) {
80 			remote_port = of_graph_get_remote_port(ep);
81 			if (remote_port) {
82 				crtcs |= drm_of_crtc_port_mask(drm, remote_port);
83 				of_node_put(remote_port);
84 			}
85 		}
86 	} else {
87 		crtcs = drm_of_find_possible_crtcs(drm, node);
88 	}
89 
90 crtcs_exit:
91 	of_node_put(remote);
92 
93 	return crtcs;
94 }
95 
96 static int sun8i_dw_hdmi_find_connector_pdev(struct device *dev,
97 					     struct platform_device **pdev_out)
98 {
99 	struct platform_device *pdev;
100 	struct device_node *remote;
101 
102 	remote = of_graph_get_remote_node(dev->of_node, 1, -1);
103 	if (!remote)
104 		return -ENODEV;
105 
106 	if (!of_device_is_compatible(remote, "hdmi-connector")) {
107 		of_node_put(remote);
108 		return -ENODEV;
109 	}
110 
111 	pdev = of_find_device_by_node(remote);
112 	of_node_put(remote);
113 	if (!pdev)
114 		return -ENODEV;
115 
116 	*pdev_out = pdev;
117 	return 0;
118 }
119 
120 static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
121 			      void *data)
122 {
123 	struct platform_device *pdev = to_platform_device(dev), *connector_pdev;
124 	struct dw_hdmi_plat_data *plat_data;
125 	struct drm_device *drm = data;
126 	struct device_node *phy_node;
127 	struct drm_encoder *encoder;
128 	struct sun8i_dw_hdmi *hdmi;
129 	int ret;
130 
131 	if (!pdev->dev.of_node)
132 		return -ENODEV;
133 
134 	hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
135 	if (!hdmi)
136 		return -ENOMEM;
137 
138 	plat_data = &hdmi->plat_data;
139 	hdmi->dev = &pdev->dev;
140 	encoder = &hdmi->encoder;
141 
142 	hdmi->quirks = of_device_get_match_data(dev);
143 
144 	encoder->possible_crtcs =
145 		sun8i_dw_hdmi_find_possible_crtcs(drm, dev->of_node);
146 	/*
147 	 * If we failed to find the CRTC(s) which this encoder is
148 	 * supposed to be connected to, it's because the CRTC has
149 	 * not been registered yet.  Defer probing, and hope that
150 	 * the required CRTC is added later.
151 	 */
152 	if (encoder->possible_crtcs == 0)
153 		return -EPROBE_DEFER;
154 
155 	hdmi->rst_ctrl = devm_reset_control_get(dev, "ctrl");
156 	if (IS_ERR(hdmi->rst_ctrl))
157 		return dev_err_probe(dev, PTR_ERR(hdmi->rst_ctrl),
158 				     "Could not get ctrl reset control\n");
159 
160 	hdmi->clk_tmds = devm_clk_get(dev, "tmds");
161 	if (IS_ERR(hdmi->clk_tmds))
162 		return dev_err_probe(dev, PTR_ERR(hdmi->clk_tmds),
163 				     "Couldn't get the tmds clock\n");
164 
165 	hdmi->regulator = devm_regulator_get(dev, "hvcc");
166 	if (IS_ERR(hdmi->regulator))
167 		return dev_err_probe(dev, PTR_ERR(hdmi->regulator),
168 				     "Couldn't get regulator\n");
169 
170 	ret = sun8i_dw_hdmi_find_connector_pdev(dev, &connector_pdev);
171 	if (!ret) {
172 		hdmi->ddc_en = gpiod_get_optional(&connector_pdev->dev,
173 						  "ddc-en", GPIOD_OUT_HIGH);
174 		platform_device_put(connector_pdev);
175 
176 		if (IS_ERR(hdmi->ddc_en)) {
177 			dev_err(dev, "Couldn't get ddc-en gpio\n");
178 			return PTR_ERR(hdmi->ddc_en);
179 		}
180 	}
181 
182 	ret = regulator_enable(hdmi->regulator);
183 	if (ret) {
184 		dev_err(dev, "Failed to enable regulator\n");
185 		goto err_unref_ddc_en;
186 	}
187 
188 	gpiod_set_value(hdmi->ddc_en, 1);
189 
190 	ret = reset_control_deassert(hdmi->rst_ctrl);
191 	if (ret) {
192 		dev_err(dev, "Could not deassert ctrl reset control\n");
193 		goto err_disable_ddc_en;
194 	}
195 
196 	ret = clk_prepare_enable(hdmi->clk_tmds);
197 	if (ret) {
198 		dev_err(dev, "Could not enable tmds clock\n");
199 		goto err_assert_ctrl_reset;
200 	}
201 
202 	phy_node = of_parse_phandle(dev->of_node, "phys", 0);
203 	if (!phy_node) {
204 		dev_err(dev, "Can't found PHY phandle\n");
205 		ret = -EINVAL;
206 		goto err_disable_clk_tmds;
207 	}
208 
209 	ret = sun8i_hdmi_phy_get(hdmi, phy_node);
210 	of_node_put(phy_node);
211 	if (ret) {
212 		dev_err(dev, "Couldn't get the HDMI PHY\n");
213 		goto err_disable_clk_tmds;
214 	}
215 
216 	ret = sun8i_hdmi_phy_init(hdmi->phy);
217 	if (ret)
218 		goto err_disable_clk_tmds;
219 
220 	drm_encoder_helper_add(encoder, &sun8i_dw_hdmi_encoder_helper_funcs);
221 	drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
222 
223 	plat_data->mode_valid = hdmi->quirks->mode_valid;
224 	plat_data->use_drm_infoframe = hdmi->quirks->use_drm_infoframe;
225 	sun8i_hdmi_phy_set_ops(hdmi->phy, plat_data);
226 
227 	platform_set_drvdata(pdev, hdmi);
228 
229 	hdmi->hdmi = dw_hdmi_bind(pdev, encoder, plat_data);
230 
231 	/*
232 	 * If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),
233 	 * which would have called the encoder cleanup.  Do it manually.
234 	 */
235 	if (IS_ERR(hdmi->hdmi)) {
236 		ret = PTR_ERR(hdmi->hdmi);
237 		goto cleanup_encoder;
238 	}
239 
240 	return 0;
241 
242 cleanup_encoder:
243 	drm_encoder_cleanup(encoder);
244 err_disable_clk_tmds:
245 	clk_disable_unprepare(hdmi->clk_tmds);
246 err_assert_ctrl_reset:
247 	reset_control_assert(hdmi->rst_ctrl);
248 err_disable_ddc_en:
249 	gpiod_set_value(hdmi->ddc_en, 0);
250 	regulator_disable(hdmi->regulator);
251 err_unref_ddc_en:
252 	if (hdmi->ddc_en)
253 		gpiod_put(hdmi->ddc_en);
254 
255 	return ret;
256 }
257 
258 static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
259 				 void *data)
260 {
261 	struct sun8i_dw_hdmi *hdmi = dev_get_drvdata(dev);
262 
263 	dw_hdmi_unbind(hdmi->hdmi);
264 	sun8i_hdmi_phy_deinit(hdmi->phy);
265 	clk_disable_unprepare(hdmi->clk_tmds);
266 	reset_control_assert(hdmi->rst_ctrl);
267 	gpiod_set_value(hdmi->ddc_en, 0);
268 	regulator_disable(hdmi->regulator);
269 
270 	if (hdmi->ddc_en)
271 		gpiod_put(hdmi->ddc_en);
272 }
273 
274 static const struct component_ops sun8i_dw_hdmi_ops = {
275 	.bind	= sun8i_dw_hdmi_bind,
276 	.unbind	= sun8i_dw_hdmi_unbind,
277 };
278 
279 static int sun8i_dw_hdmi_probe(struct platform_device *pdev)
280 {
281 	return component_add(&pdev->dev, &sun8i_dw_hdmi_ops);
282 }
283 
284 static int sun8i_dw_hdmi_remove(struct platform_device *pdev)
285 {
286 	component_del(&pdev->dev, &sun8i_dw_hdmi_ops);
287 
288 	return 0;
289 }
290 
291 static const struct sun8i_dw_hdmi_quirks sun8i_a83t_quirks = {
292 	.mode_valid = sun8i_dw_hdmi_mode_valid_a83t,
293 };
294 
295 static const struct sun8i_dw_hdmi_quirks sun50i_h6_quirks = {
296 	.mode_valid = sun8i_dw_hdmi_mode_valid_h6,
297 	.use_drm_infoframe = true,
298 };
299 
300 static const struct of_device_id sun8i_dw_hdmi_dt_ids[] = {
301 	{
302 		.compatible = "allwinner,sun8i-a83t-dw-hdmi",
303 		.data = &sun8i_a83t_quirks,
304 	},
305 	{
306 		.compatible = "allwinner,sun50i-h6-dw-hdmi",
307 		.data = &sun50i_h6_quirks,
308 	},
309 	{ /* sentinel */ },
310 };
311 MODULE_DEVICE_TABLE(of, sun8i_dw_hdmi_dt_ids);
312 
313 static struct platform_driver sun8i_dw_hdmi_pltfm_driver = {
314 	.probe  = sun8i_dw_hdmi_probe,
315 	.remove = sun8i_dw_hdmi_remove,
316 	.driver = {
317 		.name = "sun8i-dw-hdmi",
318 		.of_match_table = sun8i_dw_hdmi_dt_ids,
319 	},
320 };
321 
322 static int __init sun8i_dw_hdmi_init(void)
323 {
324 	int ret;
325 
326 	ret = platform_driver_register(&sun8i_dw_hdmi_pltfm_driver);
327 	if (ret)
328 		return ret;
329 
330 	ret = platform_driver_register(&sun8i_hdmi_phy_driver);
331 	if (ret) {
332 		platform_driver_unregister(&sun8i_dw_hdmi_pltfm_driver);
333 		return ret;
334 	}
335 
336 	return ret;
337 }
338 
339 static void __exit sun8i_dw_hdmi_exit(void)
340 {
341 	platform_driver_unregister(&sun8i_dw_hdmi_pltfm_driver);
342 	platform_driver_unregister(&sun8i_hdmi_phy_driver);
343 }
344 
345 module_init(sun8i_dw_hdmi_init);
346 module_exit(sun8i_dw_hdmi_exit);
347 
348 MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@siol.net>");
349 MODULE_DESCRIPTION("Allwinner DW HDMI bridge");
350 MODULE_LICENSE("GPL");
351