1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Rockchip SoC DP (Display Port) interface driver.
4  *
5  * Copyright (C) Fuzhou Rockchip Electronics Co., Ltd.
6  * Author: Andy Yan <andy.yan@rock-chips.com>
7  *         Yakir Yang <ykk@rock-chips.com>
8  *         Jeff Chen <jeff.chen@rock-chips.com>
9  */
10 
11 #include <linux/component.h>
12 #include <linux/mfd/syscon.h>
13 #include <linux/of.h>
14 #include <linux/of_graph.h>
15 #include <linux/platform_device.h>
16 #include <linux/regmap.h>
17 #include <linux/reset.h>
18 #include <linux/clk.h>
19 
20 #include <video/of_videomode.h>
21 #include <video/videomode.h>
22 
23 #include <drm/display/drm_dp_helper.h>
24 #include <drm/drm_atomic.h>
25 #include <drm/drm_atomic_helper.h>
26 #include <drm/bridge/analogix_dp.h>
27 #include <drm/drm_of.h>
28 #include <drm/drm_panel.h>
29 #include <drm/drm_probe_helper.h>
30 #include <drm/drm_simple_kms_helper.h>
31 
32 #include "rockchip_drm_drv.h"
33 #include "rockchip_drm_vop.h"
34 
35 #define RK3288_GRF_SOC_CON6		0x25c
36 #define RK3288_EDP_LCDC_SEL		BIT(5)
37 #define RK3399_GRF_SOC_CON20		0x6250
38 #define RK3399_EDP_LCDC_SEL		BIT(5)
39 
40 #define HIWORD_UPDATE(val, mask)	(val | (mask) << 16)
41 
42 #define PSR_WAIT_LINE_FLAG_TIMEOUT_MS	100
43 
44 /**
45  * struct rockchip_dp_chip_data - splite the grf setting of kind of chips
46  * @lcdsel_grf_reg: grf register offset of lcdc select
47  * @lcdsel_big: reg value of selecting vop big for eDP
48  * @lcdsel_lit: reg value of selecting vop little for eDP
49  * @chip_type: specific chip type
50  */
51 struct rockchip_dp_chip_data {
52 	u32	lcdsel_grf_reg;
53 	u32	lcdsel_big;
54 	u32	lcdsel_lit;
55 	u32	chip_type;
56 };
57 
58 struct rockchip_dp_device {
59 	struct drm_device        *drm_dev;
60 	struct device            *dev;
61 	struct rockchip_encoder  encoder;
62 	struct drm_display_mode  mode;
63 
64 	struct clk               *pclk;
65 	struct clk               *grfclk;
66 	struct regmap            *grf;
67 	struct reset_control     *rst;
68 
69 	const struct rockchip_dp_chip_data *data;
70 
71 	struct analogix_dp_device *adp;
72 	struct analogix_dp_plat_data plat_data;
73 };
74 
75 static struct rockchip_dp_device *encoder_to_dp(struct drm_encoder *encoder)
76 {
77 	struct rockchip_encoder *rkencoder = to_rockchip_encoder(encoder);
78 
79 	return container_of(rkencoder, struct rockchip_dp_device, encoder);
80 }
81 
82 static struct rockchip_dp_device *pdata_encoder_to_dp(struct analogix_dp_plat_data *plat_data)
83 {
84 	return container_of(plat_data, struct rockchip_dp_device, plat_data);
85 }
86 
87 static int rockchip_dp_pre_init(struct rockchip_dp_device *dp)
88 {
89 	reset_control_assert(dp->rst);
90 	usleep_range(10, 20);
91 	reset_control_deassert(dp->rst);
92 
93 	return 0;
94 }
95 
96 static int rockchip_dp_poweron_start(struct analogix_dp_plat_data *plat_data)
97 {
98 	struct rockchip_dp_device *dp = pdata_encoder_to_dp(plat_data);
99 	int ret;
100 
101 	ret = clk_prepare_enable(dp->pclk);
102 	if (ret < 0) {
103 		DRM_DEV_ERROR(dp->dev, "failed to enable pclk %d\n", ret);
104 		return ret;
105 	}
106 
107 	ret = rockchip_dp_pre_init(dp);
108 	if (ret < 0) {
109 		DRM_DEV_ERROR(dp->dev, "failed to dp pre init %d\n", ret);
110 		clk_disable_unprepare(dp->pclk);
111 		return ret;
112 	}
113 
114 	return ret;
115 }
116 
117 static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
118 {
119 	struct rockchip_dp_device *dp = pdata_encoder_to_dp(plat_data);
120 
121 	clk_disable_unprepare(dp->pclk);
122 
123 	return 0;
124 }
125 
126 static int rockchip_dp_get_modes(struct analogix_dp_plat_data *plat_data,
127 				 struct drm_connector *connector)
128 {
129 	struct drm_display_info *di = &connector->display_info;
130 	/* VOP couldn't output YUV video format for eDP rightly */
131 	u32 mask = DRM_COLOR_FORMAT_YCBCR444 | DRM_COLOR_FORMAT_YCBCR422;
132 
133 	if ((di->color_formats & mask)) {
134 		DRM_DEBUG_KMS("Swapping display color format from YUV to RGB\n");
135 		di->color_formats &= ~mask;
136 		di->color_formats |= DRM_COLOR_FORMAT_RGB444;
137 		di->bpc = 8;
138 	}
139 
140 	return 0;
141 }
142 
143 static bool
144 rockchip_dp_drm_encoder_mode_fixup(struct drm_encoder *encoder,
145 				   const struct drm_display_mode *mode,
146 				   struct drm_display_mode *adjusted_mode)
147 {
148 	/* do nothing */
149 	return true;
150 }
151 
152 static void rockchip_dp_drm_encoder_mode_set(struct drm_encoder *encoder,
153 					     struct drm_display_mode *mode,
154 					     struct drm_display_mode *adjusted)
155 {
156 	/* do nothing */
157 }
158 
159 static
160 struct drm_crtc *rockchip_dp_drm_get_new_crtc(struct drm_encoder *encoder,
161 					      struct drm_atomic_state *state)
162 {
163 	struct drm_connector *connector;
164 	struct drm_connector_state *conn_state;
165 
166 	connector = drm_atomic_get_new_connector_for_encoder(state, encoder);
167 	if (!connector)
168 		return NULL;
169 
170 	conn_state = drm_atomic_get_new_connector_state(state, connector);
171 	if (!conn_state)
172 		return NULL;
173 
174 	return conn_state->crtc;
175 }
176 
177 static void rockchip_dp_drm_encoder_enable(struct drm_encoder *encoder,
178 					   struct drm_atomic_state *state)
179 {
180 	struct rockchip_dp_device *dp = encoder_to_dp(encoder);
181 	struct drm_crtc *crtc;
182 	struct drm_crtc_state *old_crtc_state;
183 	int ret;
184 	u32 val;
185 
186 	crtc = rockchip_dp_drm_get_new_crtc(encoder, state);
187 	if (!crtc)
188 		return;
189 
190 	old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
191 	/* Coming back from self refresh, nothing to do */
192 	if (old_crtc_state && old_crtc_state->self_refresh_active)
193 		return;
194 
195 	ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
196 	if (ret < 0)
197 		return;
198 
199 	if (ret)
200 		val = dp->data->lcdsel_lit;
201 	else
202 		val = dp->data->lcdsel_big;
203 
204 	DRM_DEV_DEBUG(dp->dev, "vop %s output to dp\n", (ret) ? "LIT" : "BIG");
205 
206 	ret = clk_prepare_enable(dp->grfclk);
207 	if (ret < 0) {
208 		DRM_DEV_ERROR(dp->dev, "failed to enable grfclk %d\n", ret);
209 		return;
210 	}
211 
212 	ret = regmap_write(dp->grf, dp->data->lcdsel_grf_reg, val);
213 	if (ret != 0)
214 		DRM_DEV_ERROR(dp->dev, "Could not write to GRF: %d\n", ret);
215 
216 	clk_disable_unprepare(dp->grfclk);
217 }
218 
219 static void rockchip_dp_drm_encoder_disable(struct drm_encoder *encoder,
220 					    struct drm_atomic_state *state)
221 {
222 	struct rockchip_dp_device *dp = encoder_to_dp(encoder);
223 	struct drm_crtc *crtc;
224 	struct drm_crtc_state *new_crtc_state = NULL;
225 	int ret;
226 
227 	crtc = rockchip_dp_drm_get_new_crtc(encoder, state);
228 	/* No crtc means we're doing a full shutdown */
229 	if (!crtc)
230 		return;
231 
232 	new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
233 	/* If we're not entering self-refresh, no need to wait for vact */
234 	if (!new_crtc_state || !new_crtc_state->self_refresh_active)
235 		return;
236 
237 	ret = rockchip_drm_wait_vact_end(crtc, PSR_WAIT_LINE_FLAG_TIMEOUT_MS);
238 	if (ret)
239 		DRM_DEV_ERROR(dp->dev, "line flag irq timed out\n");
240 }
241 
242 static int
243 rockchip_dp_drm_encoder_atomic_check(struct drm_encoder *encoder,
244 				      struct drm_crtc_state *crtc_state,
245 				      struct drm_connector_state *conn_state)
246 {
247 	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
248 	struct drm_display_info *di = &conn_state->connector->display_info;
249 
250 	/*
251 	 * The hardware IC designed that VOP must output the RGB10 video
252 	 * format to eDP controller, and if eDP panel only support RGB8,
253 	 * then eDP controller should cut down the video data, not via VOP
254 	 * controller, that's why we need to hardcode the VOP output mode
255 	 * to RGA10 here.
256 	 */
257 
258 	s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
259 	s->output_type = DRM_MODE_CONNECTOR_eDP;
260 	s->output_bpc = di->bpc;
261 
262 	return 0;
263 }
264 
265 static struct drm_encoder_helper_funcs rockchip_dp_encoder_helper_funcs = {
266 	.mode_fixup = rockchip_dp_drm_encoder_mode_fixup,
267 	.mode_set = rockchip_dp_drm_encoder_mode_set,
268 	.atomic_enable = rockchip_dp_drm_encoder_enable,
269 	.atomic_disable = rockchip_dp_drm_encoder_disable,
270 	.atomic_check = rockchip_dp_drm_encoder_atomic_check,
271 };
272 
273 static int rockchip_dp_of_probe(struct rockchip_dp_device *dp)
274 {
275 	struct device *dev = dp->dev;
276 	struct device_node *np = dev->of_node;
277 
278 	dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
279 	if (IS_ERR(dp->grf)) {
280 		DRM_DEV_ERROR(dev, "failed to get rockchip,grf property\n");
281 		return PTR_ERR(dp->grf);
282 	}
283 
284 	dp->grfclk = devm_clk_get(dev, "grf");
285 	if (PTR_ERR(dp->grfclk) == -ENOENT) {
286 		dp->grfclk = NULL;
287 	} else if (PTR_ERR(dp->grfclk) == -EPROBE_DEFER) {
288 		return -EPROBE_DEFER;
289 	} else if (IS_ERR(dp->grfclk)) {
290 		DRM_DEV_ERROR(dev, "failed to get grf clock\n");
291 		return PTR_ERR(dp->grfclk);
292 	}
293 
294 	dp->pclk = devm_clk_get(dev, "pclk");
295 	if (IS_ERR(dp->pclk)) {
296 		DRM_DEV_ERROR(dev, "failed to get pclk property\n");
297 		return PTR_ERR(dp->pclk);
298 	}
299 
300 	dp->rst = devm_reset_control_get(dev, "dp");
301 	if (IS_ERR(dp->rst)) {
302 		DRM_DEV_ERROR(dev, "failed to get dp reset control\n");
303 		return PTR_ERR(dp->rst);
304 	}
305 
306 	return 0;
307 }
308 
309 static int rockchip_dp_drm_create_encoder(struct rockchip_dp_device *dp)
310 {
311 	struct drm_encoder *encoder = &dp->encoder.encoder;
312 	struct drm_device *drm_dev = dp->drm_dev;
313 	struct device *dev = dp->dev;
314 	int ret;
315 
316 	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
317 							     dev->of_node);
318 	DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
319 
320 	ret = drm_simple_encoder_init(drm_dev, encoder,
321 				      DRM_MODE_ENCODER_TMDS);
322 	if (ret) {
323 		DRM_ERROR("failed to initialize encoder with drm\n");
324 		return ret;
325 	}
326 
327 	drm_encoder_helper_add(encoder, &rockchip_dp_encoder_helper_funcs);
328 
329 	return 0;
330 }
331 
332 static int rockchip_dp_bind(struct device *dev, struct device *master,
333 			    void *data)
334 {
335 	struct rockchip_dp_device *dp = dev_get_drvdata(dev);
336 	struct drm_device *drm_dev = data;
337 	int ret;
338 
339 	dp->drm_dev = drm_dev;
340 
341 	ret = rockchip_dp_drm_create_encoder(dp);
342 	if (ret) {
343 		DRM_ERROR("failed to create drm encoder\n");
344 		return ret;
345 	}
346 
347 	dp->plat_data.encoder = &dp->encoder.encoder;
348 
349 	ret = analogix_dp_bind(dp->adp, drm_dev);
350 	if (ret)
351 		goto err_cleanup_encoder;
352 
353 	return 0;
354 err_cleanup_encoder:
355 	dp->encoder.encoder.funcs->destroy(&dp->encoder.encoder);
356 	return ret;
357 }
358 
359 static void rockchip_dp_unbind(struct device *dev, struct device *master,
360 			       void *data)
361 {
362 	struct rockchip_dp_device *dp = dev_get_drvdata(dev);
363 
364 	analogix_dp_unbind(dp->adp);
365 	dp->encoder.encoder.funcs->destroy(&dp->encoder.encoder);
366 }
367 
368 static const struct component_ops rockchip_dp_component_ops = {
369 	.bind = rockchip_dp_bind,
370 	.unbind = rockchip_dp_unbind,
371 };
372 
373 static int rockchip_dp_probe(struct platform_device *pdev)
374 {
375 	struct device *dev = &pdev->dev;
376 	const struct rockchip_dp_chip_data *dp_data;
377 	struct drm_panel *panel = NULL;
378 	struct rockchip_dp_device *dp;
379 	int ret;
380 
381 	dp_data = of_device_get_match_data(dev);
382 	if (!dp_data)
383 		return -ENODEV;
384 
385 	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
386 	if (ret < 0)
387 		return ret;
388 
389 	dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
390 	if (!dp)
391 		return -ENOMEM;
392 
393 	dp->dev = dev;
394 	dp->adp = ERR_PTR(-ENODEV);
395 	dp->data = dp_data;
396 	dp->plat_data.panel = panel;
397 	dp->plat_data.dev_type = dp->data->chip_type;
398 	dp->plat_data.power_on_start = rockchip_dp_poweron_start;
399 	dp->plat_data.power_off = rockchip_dp_powerdown;
400 	dp->plat_data.get_modes = rockchip_dp_get_modes;
401 
402 	ret = rockchip_dp_of_probe(dp);
403 	if (ret < 0)
404 		return ret;
405 
406 	platform_set_drvdata(pdev, dp);
407 
408 	dp->adp = analogix_dp_probe(dev, &dp->plat_data);
409 	if (IS_ERR(dp->adp))
410 		return PTR_ERR(dp->adp);
411 
412 	ret = component_add(dev, &rockchip_dp_component_ops);
413 	if (ret)
414 		goto err_dp_remove;
415 
416 	return 0;
417 
418 err_dp_remove:
419 	analogix_dp_remove(dp->adp);
420 	return ret;
421 }
422 
423 static void rockchip_dp_remove(struct platform_device *pdev)
424 {
425 	struct rockchip_dp_device *dp = platform_get_drvdata(pdev);
426 
427 	component_del(&pdev->dev, &rockchip_dp_component_ops);
428 	analogix_dp_remove(dp->adp);
429 }
430 
431 #ifdef CONFIG_PM_SLEEP
432 static int rockchip_dp_suspend(struct device *dev)
433 {
434 	struct rockchip_dp_device *dp = dev_get_drvdata(dev);
435 
436 	if (IS_ERR(dp->adp))
437 		return 0;
438 
439 	return analogix_dp_suspend(dp->adp);
440 }
441 
442 static int rockchip_dp_resume(struct device *dev)
443 {
444 	struct rockchip_dp_device *dp = dev_get_drvdata(dev);
445 
446 	if (IS_ERR(dp->adp))
447 		return 0;
448 
449 	return analogix_dp_resume(dp->adp);
450 }
451 #endif
452 
453 static const struct dev_pm_ops rockchip_dp_pm_ops = {
454 #ifdef CONFIG_PM_SLEEP
455 	.suspend_late = rockchip_dp_suspend,
456 	.resume_early = rockchip_dp_resume,
457 #endif
458 };
459 
460 static const struct rockchip_dp_chip_data rk3399_edp = {
461 	.lcdsel_grf_reg = RK3399_GRF_SOC_CON20,
462 	.lcdsel_big = HIWORD_UPDATE(0, RK3399_EDP_LCDC_SEL),
463 	.lcdsel_lit = HIWORD_UPDATE(RK3399_EDP_LCDC_SEL, RK3399_EDP_LCDC_SEL),
464 	.chip_type = RK3399_EDP,
465 };
466 
467 static const struct rockchip_dp_chip_data rk3288_dp = {
468 	.lcdsel_grf_reg = RK3288_GRF_SOC_CON6,
469 	.lcdsel_big = HIWORD_UPDATE(0, RK3288_EDP_LCDC_SEL),
470 	.lcdsel_lit = HIWORD_UPDATE(RK3288_EDP_LCDC_SEL, RK3288_EDP_LCDC_SEL),
471 	.chip_type = RK3288_DP,
472 };
473 
474 static const struct of_device_id rockchip_dp_dt_ids[] = {
475 	{.compatible = "rockchip,rk3288-dp", .data = &rk3288_dp },
476 	{.compatible = "rockchip,rk3399-edp", .data = &rk3399_edp },
477 	{}
478 };
479 MODULE_DEVICE_TABLE(of, rockchip_dp_dt_ids);
480 
481 struct platform_driver rockchip_dp_driver = {
482 	.probe = rockchip_dp_probe,
483 	.remove_new = rockchip_dp_remove,
484 	.driver = {
485 		   .name = "rockchip-dp",
486 		   .pm = &rockchip_dp_pm_ops,
487 		   .of_match_table = rockchip_dp_dt_ids,
488 	},
489 };
490