1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Samsung SoC DP (Display Port) interface driver.
  4 *
  5 * Copyright (C) 2012 Samsung Electronics Co., Ltd.
  6 * Author: Jingoo Han <jg1.han@samsung.com>
  7 */
  8
  9#include <linux/clk.h>
 10#include <linux/component.h>
 11#include <linux/err.h>
 12#include <linux/module.h>
 13#include <linux/of_graph.h>
 14#include <linux/platform_device.h>
 15#include <linux/pm_runtime.h>
 16#include <video/of_display_timing.h>
 17#include <video/of_videomode.h>
 18#include <video/videomode.h>
 19
 20#include <drm/bridge/analogix_dp.h>
 21#include <drm/drm_atomic_helper.h>
 22#include <drm/drm_bridge.h>
 23#include <drm/drm_crtc.h>
 24#include <drm/drm_of.h>
 25#include <drm/drm_panel.h>
 26#include <drm/drm_print.h>
 27#include <drm/drm_probe_helper.h>
 28#include <drm/drm_simple_kms_helper.h>
 29#include <drm/exynos_drm.h>
 30
 31#include "exynos_drm_crtc.h"
 32
 33#define to_dp(nm)	container_of(nm, struct exynos_dp_device, nm)
 34
 35struct exynos_dp_device {
 36	struct drm_encoder         encoder;
 37	struct drm_connector       *connector;
 38	struct drm_bridge          *ptn_bridge;
 39	struct drm_device          *drm_dev;
 40	struct device              *dev;
 41
 42	struct videomode           vm;
 43	struct analogix_dp_device *adp;
 44	struct analogix_dp_plat_data plat_data;
 45};
 46
 47static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
 48				bool enable)
 49{
 50	struct exynos_dp_device *dp = to_dp(plat_data);
 51	struct drm_encoder *encoder = &dp->encoder;
 52
 53	if (!encoder->crtc)
 54		return -EPERM;
 55
 56	exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable);
 57
 58	return 0;
 59}
 60
 61static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
 62{
 63	return exynos_dp_crtc_clock_enable(plat_data, true);
 64}
 65
 66static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
 67{
 68	return exynos_dp_crtc_clock_enable(plat_data, false);
 69}
 70
 71static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
 72			       struct drm_connector *connector)
 73{
 74	struct exynos_dp_device *dp = to_dp(plat_data);
 75	struct drm_display_mode *mode;
 76	int num_modes = 0;
 77
 78	if (dp->plat_data.panel)
 79		return num_modes;
 80
 81	mode = drm_mode_create(connector->dev);
 82	if (!mode) {
 83		DRM_DEV_ERROR(dp->dev,
 84			      "failed to create a new display mode.\n");
 85		return num_modes;
 86	}
 87
 88	drm_display_mode_from_videomode(&dp->vm, mode);
 89	connector->display_info.width_mm = mode->width_mm;
 90	connector->display_info.height_mm = mode->height_mm;
 91
 92	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 93	drm_mode_set_name(mode);
 94	drm_mode_probed_add(connector, mode);
 95
 96	return num_modes + 1;
 97}
 98
 99static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
100				   struct drm_bridge *bridge,
101				   struct drm_connector *connector)
102{
103	struct exynos_dp_device *dp = to_dp(plat_data);
104	int ret;
105
106	dp->connector = connector;
107
108	/* Pre-empt DP connector creation if there's a bridge */
109	if (dp->ptn_bridge) {
110		ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge,
111					0);
112		if (ret) {
113			DRM_DEV_ERROR(dp->dev,
114				      "Failed to attach bridge to drm\n");
115			return ret;
116		}
117	}
118
119	return 0;
120}
121
122static void exynos_dp_mode_set(struct drm_encoder *encoder,
123			       struct drm_display_mode *mode,
124			       struct drm_display_mode *adjusted_mode)
125{
126}
127
128static void exynos_dp_nop(struct drm_encoder *encoder)
129{
130	/* do nothing */
131}
132
133static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
134	.mode_set = exynos_dp_mode_set,
135	.enable = exynos_dp_nop,
136	.disable = exynos_dp_nop,
137};
138
139static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
140{
141	int ret;
142
143	ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
144	if (ret) {
145		DRM_DEV_ERROR(dp->dev,
146			      "failed: of_get_videomode() : %d\n", ret);
147		return ret;
148	}
149	return 0;
150}
151
152static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
153{
154	struct exynos_dp_device *dp = dev_get_drvdata(dev);
155	struct drm_encoder *encoder = &dp->encoder;
156	struct drm_device *drm_dev = data;
157	int ret;
158
159	dp->drm_dev = drm_dev;
160
161	if (!dp->plat_data.panel && !dp->ptn_bridge) {
162		ret = exynos_dp_dt_parse_panel(dp);
163		if (ret)
164			return ret;
165	}
166
167	drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
168
169	drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
170
171	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
172	if (ret < 0)
173		return ret;
174
175	dp->plat_data.encoder = encoder;
176
177	ret = analogix_dp_bind(dp->adp, dp->drm_dev);
178	if (ret)
179		dp->encoder.funcs->destroy(&dp->encoder);
180
181	return ret;
182}
183
184static void exynos_dp_unbind(struct device *dev, struct device *master,
185			     void *data)
186{
187	struct exynos_dp_device *dp = dev_get_drvdata(dev);
188
189	analogix_dp_unbind(dp->adp);
190	dp->encoder.funcs->destroy(&dp->encoder);
191}
192
193static const struct component_ops exynos_dp_ops = {
194	.bind	= exynos_dp_bind,
195	.unbind	= exynos_dp_unbind,
196};
197
198static int exynos_dp_probe(struct platform_device *pdev)
199{
200	struct device *dev = &pdev->dev;
201	struct device_node *np;
202	struct exynos_dp_device *dp;
203	struct drm_panel *panel;
204	struct drm_bridge *bridge;
205	int ret;
206
207	dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
208			  GFP_KERNEL);
209	if (!dp)
210		return -ENOMEM;
211
212	dp->dev = dev;
213	/*
214	 * We just use the drvdata until driver run into component
215	 * add function, and then we would set drvdata to null, so
216	 * that analogix dp driver would take charge of the drvdata.
217	 */
218	platform_set_drvdata(pdev, dp);
219
220	/* This is for the backward compatibility. */
221	np = of_parse_phandle(dev->of_node, "panel", 0);
222	if (np) {
223		dp->plat_data.panel = of_drm_find_panel(np);
224
225		of_node_put(np);
226		if (IS_ERR(dp->plat_data.panel))
227			return PTR_ERR(dp->plat_data.panel);
228
229		goto out;
230	}
231
232	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
233	if (ret)
234		return ret;
235
236	/* The remote port can be either a panel or a bridge */
237	dp->plat_data.panel = panel;
238	dp->plat_data.dev_type = EXYNOS_DP;
239	dp->plat_data.power_on_start = exynos_dp_poweron;
240	dp->plat_data.power_off = exynos_dp_poweroff;
241	dp->plat_data.attach = exynos_dp_bridge_attach;
242	dp->plat_data.get_modes = exynos_dp_get_modes;
243	dp->plat_data.skip_connector = !!bridge;
244
245	dp->ptn_bridge = bridge;
246
247out:
248	dp->adp = analogix_dp_probe(dev, &dp->plat_data);
249	if (IS_ERR(dp->adp))
250		return PTR_ERR(dp->adp);
251
252	return component_add(&pdev->dev, &exynos_dp_ops);
253}
254
255static int exynos_dp_remove(struct platform_device *pdev)
256{
257	struct exynos_dp_device *dp = platform_get_drvdata(pdev);
258
259	component_del(&pdev->dev, &exynos_dp_ops);
260	analogix_dp_remove(dp->adp);
261
262	return 0;
263}
264
265#ifdef CONFIG_PM
266static int exynos_dp_suspend(struct device *dev)
267{
268	struct exynos_dp_device *dp = dev_get_drvdata(dev);
269
270	return analogix_dp_suspend(dp->adp);
271}
272
273static int exynos_dp_resume(struct device *dev)
274{
275	struct exynos_dp_device *dp = dev_get_drvdata(dev);
276
277	return analogix_dp_resume(dp->adp);
278}
279#endif
280
281static const struct dev_pm_ops exynos_dp_pm_ops = {
282	SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
283	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
284				pm_runtime_force_resume)
285};
286
287static const struct of_device_id exynos_dp_match[] = {
288	{ .compatible = "samsung,exynos5-dp" },
289	{},
290};
291MODULE_DEVICE_TABLE(of, exynos_dp_match);
292
293struct platform_driver dp_driver = {
294	.probe		= exynos_dp_probe,
295	.remove		= exynos_dp_remove,
296	.driver		= {
297		.name	= "exynos-dp",
298		.owner	= THIS_MODULE,
299		.pm	= &exynos_dp_pm_ops,
300		.of_match_table = exynos_dp_match,
301	},
302};
303
304MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
305MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
306MODULE_LICENSE("GPL v2");