1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * i.MX drm driver - parallel display implementation
4 *
5 * Copyright (C) 2012 Sascha Hauer, Pengutronix
6 */
7
8#include <linux/component.h>
9#include <linux/module.h>
10#include <linux/platform_device.h>
11#include <linux/videodev2.h>
12
13#include <video/of_display_timing.h>
14
15#include <drm/drm_atomic_helper.h>
16#include <drm/drm_bridge.h>
17#include <drm/drm_fb_helper.h>
18#include <drm/drm_of.h>
19#include <drm/drm_panel.h>
20#include <drm/drm_probe_helper.h>
21#include <drm/drm_simple_kms_helper.h>
22
23#include "imx-drm.h"
24
25struct imx_parallel_display {
26	struct drm_connector connector;
27	struct drm_encoder encoder;
28	struct drm_bridge bridge;
29	struct device *dev;
30	void *edid;
31	u32 bus_format;
32	u32 bus_flags;
33	struct drm_display_mode mode;
34	struct drm_panel *panel;
35	struct drm_bridge *next_bridge;
36};
37
38static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
39{
40	return container_of(c, struct imx_parallel_display, connector);
41}
42
43static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b)
44{
45	return container_of(b, struct imx_parallel_display, bridge);
46}
47
48static int imx_pd_connector_get_modes(struct drm_connector *connector)
49{
50	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
51	struct device_node *np = imxpd->dev->of_node;
52	int num_modes;
53
54	num_modes = drm_panel_get_modes(imxpd->panel, connector);
55	if (num_modes > 0)
56		return num_modes;
57
58	if (imxpd->edid) {
59		drm_connector_update_edid_property(connector, imxpd->edid);
60		num_modes = drm_add_edid_modes(connector, imxpd->edid);
61	}
62
63	if (np) {
64		struct drm_display_mode *mode = drm_mode_create(connector->dev);
65		int ret;
66
67		if (!mode)
68			return -EINVAL;
69
70		ret = of_get_drm_display_mode(np, &imxpd->mode,
71					      &imxpd->bus_flags,
72					      OF_USE_NATIVE_MODE);
73		if (ret) {
74			drm_mode_destroy(connector->dev, mode);
75			return ret;
76		}
77
78		drm_mode_copy(mode, &imxpd->mode);
79		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
80		drm_mode_probed_add(connector, mode);
81		num_modes++;
82	}
83
84	return num_modes;
85}
86
87static void imx_pd_bridge_enable(struct drm_bridge *bridge)
88{
89	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
90
91	drm_panel_prepare(imxpd->panel);
92	drm_panel_enable(imxpd->panel);
93}
94
95static void imx_pd_bridge_disable(struct drm_bridge *bridge)
96{
97	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
98
99	drm_panel_disable(imxpd->panel);
100	drm_panel_unprepare(imxpd->panel);
101}
102
103static const u32 imx_pd_bus_fmts[] = {
104	MEDIA_BUS_FMT_RGB888_1X24,
105	MEDIA_BUS_FMT_BGR888_1X24,
106	MEDIA_BUS_FMT_GBR888_1X24,
107	MEDIA_BUS_FMT_RGB666_1X18,
108	MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
109	MEDIA_BUS_FMT_RGB565_1X16,
110};
111
112static u32 *
113imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
114					 struct drm_bridge_state *bridge_state,
115					 struct drm_crtc_state *crtc_state,
116					 struct drm_connector_state *conn_state,
117					 unsigned int *num_output_fmts)
118{
119	struct drm_display_info *di = &conn_state->connector->display_info;
120	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
121	u32 *output_fmts;
122
123	if (!imxpd->bus_format && !di->num_bus_formats) {
124		*num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
125		return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),
126			       GFP_KERNEL);
127	}
128
129	*num_output_fmts = 1;
130	output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);
131	if (!output_fmts)
132		return NULL;
133
134	if (!imxpd->bus_format && di->num_bus_formats)
135		output_fmts[0] = di->bus_formats[0];
136	else
137		output_fmts[0] = imxpd->bus_format;
138
139	return output_fmts;
140}
141
142static bool imx_pd_format_supported(u32 output_fmt)
143{
144	unsigned int i;
145
146	for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
147		if (imx_pd_bus_fmts[i] == output_fmt)
148			return true;
149	}
150
151	return false;
152}
153
154static u32 *
155imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
156					struct drm_bridge_state *bridge_state,
157					struct drm_crtc_state *crtc_state,
158					struct drm_connector_state *conn_state,
159					u32 output_fmt,
160					unsigned int *num_input_fmts)
161{
162	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
163	u32 *input_fmts;
164
165	/*
166	 * If the next bridge does not support bus format negotiation, let's
167	 * use the static bus format definition (imxpd->bus_format) if it's
168	 * specified, RGB888 when it's not.
169	 */
170	if (output_fmt == MEDIA_BUS_FMT_FIXED)
171		output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;
172
173	/* Now make sure the requested output format is supported. */
174	if ((imxpd->bus_format && imxpd->bus_format != output_fmt) ||
175	    !imx_pd_format_supported(output_fmt)) {
176		*num_input_fmts = 0;
177		return NULL;
178	}
179
180	*num_input_fmts = 1;
181	input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
182	if (!input_fmts)
183		return NULL;
184
185	input_fmts[0] = output_fmt;
186	return input_fmts;
187}
188
189static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge,
190				      struct drm_bridge_state *bridge_state,
191				      struct drm_crtc_state *crtc_state,
192				      struct drm_connector_state *conn_state)
193{
194	struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
195	struct drm_display_info *di = &conn_state->connector->display_info;
196	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
197	struct drm_bridge_state *next_bridge_state = NULL;
198	struct drm_bridge *next_bridge;
199	u32 bus_flags, bus_fmt;
200
201	next_bridge = drm_bridge_get_next_bridge(bridge);
202	if (next_bridge)
203		next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
204								    next_bridge);
205
206	if (next_bridge_state)
207		bus_flags = next_bridge_state->input_bus_cfg.flags;
208	else if (di->num_bus_formats)
209		bus_flags = di->bus_flags;
210	else
211		bus_flags = imxpd->bus_flags;
212
213	bus_fmt = bridge_state->input_bus_cfg.format;
214	if (!imx_pd_format_supported(bus_fmt))
215		return -EINVAL;
216
217	bridge_state->output_bus_cfg.flags = bus_flags;
218	bridge_state->input_bus_cfg.flags = bus_flags;
219	imx_crtc_state->bus_flags = bus_flags;
220	imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
221	imx_crtc_state->di_hsync_pin = 2;
222	imx_crtc_state->di_vsync_pin = 3;
223
224	return 0;
225}
226
227static const struct drm_connector_funcs imx_pd_connector_funcs = {
228	.fill_modes = drm_helper_probe_single_connector_modes,
229	.destroy = imx_drm_connector_destroy,
230	.reset = drm_atomic_helper_connector_reset,
231	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
232	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
233};
234
235static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
236	.get_modes = imx_pd_connector_get_modes,
237};
238
239static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
240	.enable = imx_pd_bridge_enable,
241	.disable = imx_pd_bridge_disable,
242	.atomic_reset = drm_atomic_helper_bridge_reset,
243	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
244	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
245	.atomic_check = imx_pd_bridge_atomic_check,
246	.atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,
247	.atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,
248};
249
250static int imx_pd_register(struct drm_device *drm,
251	struct imx_parallel_display *imxpd)
252{
253	struct drm_encoder *encoder = &imxpd->encoder;
254	int ret;
255
256	ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
257	if (ret)
258		return ret;
259
260	/* set the connector's dpms to OFF so that
261	 * drm_helper_connector_dpms() won't return
262	 * immediately since the current state is ON
263	 * at this point.
264	 */
265	imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
266
267	drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_NONE);
268
269	imxpd->bridge.funcs = &imx_pd_bridge_funcs;
270	drm_bridge_attach(encoder, &imxpd->bridge, NULL, 0);
271
272	if (!imxpd->next_bridge) {
273		drm_connector_helper_add(&imxpd->connector,
274				&imx_pd_connector_helper_funcs);
275		drm_connector_init(drm, &imxpd->connector,
276				   &imx_pd_connector_funcs,
277				   DRM_MODE_CONNECTOR_DPI);
278	}
279
280	if (imxpd->next_bridge) {
281		ret = drm_bridge_attach(encoder, imxpd->next_bridge,
282					&imxpd->bridge, 0);
283		if (ret < 0) {
284			dev_err(imxpd->dev, "failed to attach bridge: %d\n",
285				ret);
286			return ret;
287		}
288	} else {
289		drm_connector_attach_encoder(&imxpd->connector, encoder);
290	}
291
292	return 0;
293}
294
295static int imx_pd_bind(struct device *dev, struct device *master, void *data)
296{
297	struct drm_device *drm = data;
298	struct device_node *np = dev->of_node;
299	const u8 *edidp;
300	struct imx_parallel_display *imxpd;
301	int edid_len;
302	int ret;
303	u32 bus_format = 0;
304	const char *fmt;
305
306	imxpd = dev_get_drvdata(dev);
307	memset(imxpd, 0, sizeof(*imxpd));
308
309	/* port@1 is the output port */
310	ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,
311					  &imxpd->next_bridge);
312	if (ret && ret != -ENODEV)
313		return ret;
314
315	edidp = of_get_property(np, "edid", &edid_len);
316	if (edidp)
317		imxpd->edid = devm_kmemdup(dev, edidp, edid_len, GFP_KERNEL);
318
319	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
320	if (!ret) {
321		if (!strcmp(fmt, "rgb24"))
322			bus_format = MEDIA_BUS_FMT_RGB888_1X24;
323		else if (!strcmp(fmt, "rgb565"))
324			bus_format = MEDIA_BUS_FMT_RGB565_1X16;
325		else if (!strcmp(fmt, "bgr666"))
326			bus_format = MEDIA_BUS_FMT_RGB666_1X18;
327		else if (!strcmp(fmt, "lvds666"))
328			bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
329	}
330	imxpd->bus_format = bus_format;
331
332	imxpd->dev = dev;
333
334	ret = imx_pd_register(drm, imxpd);
335	if (ret)
336		return ret;
337
338	return 0;
339}
340
341static const struct component_ops imx_pd_ops = {
342	.bind	= imx_pd_bind,
343};
344
345static int imx_pd_probe(struct platform_device *pdev)
346{
347	struct imx_parallel_display *imxpd;
348
349	imxpd = devm_kzalloc(&pdev->dev, sizeof(*imxpd), GFP_KERNEL);
350	if (!imxpd)
351		return -ENOMEM;
352
353	platform_set_drvdata(pdev, imxpd);
354
355	return component_add(&pdev->dev, &imx_pd_ops);
356}
357
358static int imx_pd_remove(struct platform_device *pdev)
359{
360	component_del(&pdev->dev, &imx_pd_ops);
361
362	return 0;
363}
364
365static const struct of_device_id imx_pd_dt_ids[] = {
366	{ .compatible = "fsl,imx-parallel-display", },
367	{ /* sentinel */ }
368};
369MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
370
371static struct platform_driver imx_pd_driver = {
372	.probe		= imx_pd_probe,
373	.remove		= imx_pd_remove,
374	.driver		= {
375		.of_match_table = imx_pd_dt_ids,
376		.name	= "imx-parallel-display",
377	},
378};
379
380module_platform_driver(imx_pd_driver);
381
382MODULE_DESCRIPTION("i.MX parallel display driver");
383MODULE_AUTHOR("Sascha Hauer, Pengutronix");
384MODULE_LICENSE("GPL");
385MODULE_ALIAS("platform:imx-parallel-display");
386