1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
3 *
4 * derived from imx-hdmi.c(renamed to bridge/dw_hdmi.c now)
5 */
6
7 #include <linux/component.h>
8 #include <linux/mfd/syscon.h>
9 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/regmap.h>
13
14 #include <video/imx-ipu-v3.h>
15
16 #include <drm/bridge/dw_hdmi.h>
17 #include <drm/drm_atomic_helper.h>
18 #include <drm/drm_bridge.h>
19 #include <drm/drm_edid.h>
20 #include <drm/drm_encoder.h>
21 #include <drm/drm_managed.h>
22 #include <drm/drm_of.h>
23 #include <drm/drm_simple_kms_helper.h>
24
25 #include "imx-drm.h"
26
27 struct imx_hdmi;
28
29 struct imx_hdmi_encoder {
30 struct drm_encoder encoder;
31 struct imx_hdmi *hdmi;
32 };
33
34 struct imx_hdmi {
35 struct device *dev;
36 struct drm_bridge *bridge;
37 struct dw_hdmi *hdmi;
38 struct regmap *regmap;
39 };
40
enc_to_imx_hdmi(struct drm_encoder * e)41 static inline struct imx_hdmi *enc_to_imx_hdmi(struct drm_encoder *e)
42 {
43 return container_of(e, struct imx_hdmi_encoder, encoder)->hdmi;
44 }
45
46 static const struct dw_hdmi_mpll_config imx_mpll_cfg[] = {
47 {
48 45250000, {
49 { 0x01e0, 0x0000 },
50 { 0x21e1, 0x0000 },
51 { 0x41e2, 0x0000 }
52 },
53 }, {
54 92500000, {
55 { 0x0140, 0x0005 },
56 { 0x2141, 0x0005 },
57 { 0x4142, 0x0005 },
58 },
59 }, {
60 148500000, {
61 { 0x00a0, 0x000a },
62 { 0x20a1, 0x000a },
63 { 0x40a2, 0x000a },
64 },
65 }, {
66 216000000, {
67 { 0x00a0, 0x000a },
68 { 0x2001, 0x000f },
69 { 0x4002, 0x000f },
70 },
71 }, {
72 ~0UL, {
73 { 0x0000, 0x0000 },
74 { 0x0000, 0x0000 },
75 { 0x0000, 0x0000 },
76 },
77 }
78 };
79
80 static const struct dw_hdmi_curr_ctrl imx_cur_ctr[] = {
81 /* pixelclk bpp8 bpp10 bpp12 */
82 {
83 54000000, { 0x091c, 0x091c, 0x06dc },
84 }, {
85 58400000, { 0x091c, 0x06dc, 0x06dc },
86 }, {
87 72000000, { 0x06dc, 0x06dc, 0x091c },
88 }, {
89 74250000, { 0x06dc, 0x0b5c, 0x091c },
90 }, {
91 118800000, { 0x091c, 0x091c, 0x06dc },
92 }, {
93 216000000, { 0x06dc, 0x0b5c, 0x091c },
94 }, {
95 ~0UL, { 0x0000, 0x0000, 0x0000 },
96 },
97 };
98
99 /*
100 * Resistance term 133Ohm Cfg
101 * PREEMP config 0.00
102 * TX/CK level 10
103 */
104 static const struct dw_hdmi_phy_config imx_phy_config[] = {
105 /*pixelclk symbol term vlev */
106 { 216000000, 0x800d, 0x0005, 0x01ad},
107 { ~0UL, 0x0000, 0x0000, 0x0000}
108 };
109
dw_hdmi_imx_encoder_enable(struct drm_encoder * encoder)110 static void dw_hdmi_imx_encoder_enable(struct drm_encoder *encoder)
111 {
112 struct imx_hdmi *hdmi = enc_to_imx_hdmi(encoder);
113 int mux = drm_of_encoder_active_port_id(hdmi->dev->of_node, encoder);
114
115 regmap_update_bits(hdmi->regmap, IOMUXC_GPR3,
116 IMX6Q_GPR3_HDMI_MUX_CTL_MASK,
117 mux << IMX6Q_GPR3_HDMI_MUX_CTL_SHIFT);
118 }
119
dw_hdmi_imx_atomic_check(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)120 static int dw_hdmi_imx_atomic_check(struct drm_encoder *encoder,
121 struct drm_crtc_state *crtc_state,
122 struct drm_connector_state *conn_state)
123 {
124 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
125
126 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
127 imx_crtc_state->di_hsync_pin = 2;
128 imx_crtc_state->di_vsync_pin = 3;
129
130 return 0;
131 }
132
133 static const struct drm_encoder_helper_funcs dw_hdmi_imx_encoder_helper_funcs = {
134 .enable = dw_hdmi_imx_encoder_enable,
135 .atomic_check = dw_hdmi_imx_atomic_check,
136 };
137
138 static enum drm_mode_status
imx6q_hdmi_mode_valid(struct dw_hdmi * hdmi,void * data,const struct drm_display_info * info,const struct drm_display_mode * mode)139 imx6q_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
140 const struct drm_display_info *info,
141 const struct drm_display_mode *mode)
142 {
143 if (mode->clock < 13500)
144 return MODE_CLOCK_LOW;
145 /* FIXME: Hardware is capable of 266MHz, but setup data is missing. */
146 if (mode->clock > 216000)
147 return MODE_CLOCK_HIGH;
148
149 return MODE_OK;
150 }
151
152 static enum drm_mode_status
imx6dl_hdmi_mode_valid(struct dw_hdmi * hdmi,void * data,const struct drm_display_info * info,const struct drm_display_mode * mode)153 imx6dl_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
154 const struct drm_display_info *info,
155 const struct drm_display_mode *mode)
156 {
157 if (mode->clock < 13500)
158 return MODE_CLOCK_LOW;
159 /* FIXME: Hardware is capable of 270MHz, but setup data is missing. */
160 if (mode->clock > 216000)
161 return MODE_CLOCK_HIGH;
162
163 return MODE_OK;
164 }
165
166 static struct dw_hdmi_plat_data imx6q_hdmi_drv_data = {
167 .mpll_cfg = imx_mpll_cfg,
168 .cur_ctr = imx_cur_ctr,
169 .phy_config = imx_phy_config,
170 .mode_valid = imx6q_hdmi_mode_valid,
171 };
172
173 static struct dw_hdmi_plat_data imx6dl_hdmi_drv_data = {
174 .mpll_cfg = imx_mpll_cfg,
175 .cur_ctr = imx_cur_ctr,
176 .phy_config = imx_phy_config,
177 .mode_valid = imx6dl_hdmi_mode_valid,
178 };
179
180 static const struct of_device_id dw_hdmi_imx_dt_ids[] = {
181 { .compatible = "fsl,imx6q-hdmi",
182 .data = &imx6q_hdmi_drv_data
183 }, {
184 .compatible = "fsl,imx6dl-hdmi",
185 .data = &imx6dl_hdmi_drv_data
186 },
187 {},
188 };
189 MODULE_DEVICE_TABLE(of, dw_hdmi_imx_dt_ids);
190
dw_hdmi_imx_bind(struct device * dev,struct device * master,void * data)191 static int dw_hdmi_imx_bind(struct device *dev, struct device *master,
192 void *data)
193 {
194 struct drm_device *drm = data;
195 struct imx_hdmi_encoder *hdmi_encoder;
196 struct drm_encoder *encoder;
197 int ret;
198
199 hdmi_encoder = drmm_simple_encoder_alloc(drm, struct imx_hdmi_encoder,
200 encoder, DRM_MODE_ENCODER_TMDS);
201 if (IS_ERR(hdmi_encoder))
202 return PTR_ERR(hdmi_encoder);
203
204 hdmi_encoder->hdmi = dev_get_drvdata(dev);
205 encoder = &hdmi_encoder->encoder;
206
207 ret = imx_drm_encoder_parse_of(drm, encoder, dev->of_node);
208 if (ret)
209 return ret;
210
211 drm_encoder_helper_add(encoder, &dw_hdmi_imx_encoder_helper_funcs);
212
213 return drm_bridge_attach(encoder, hdmi_encoder->hdmi->bridge, NULL, 0);
214 }
215
216 static const struct component_ops dw_hdmi_imx_ops = {
217 .bind = dw_hdmi_imx_bind,
218 };
219
dw_hdmi_imx_probe(struct platform_device * pdev)220 static int dw_hdmi_imx_probe(struct platform_device *pdev)
221 {
222 struct device_node *np = pdev->dev.of_node;
223 const struct of_device_id *match = of_match_node(dw_hdmi_imx_dt_ids, np);
224 struct imx_hdmi *hdmi;
225 int ret;
226
227 hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
228 if (!hdmi)
229 return -ENOMEM;
230
231 platform_set_drvdata(pdev, hdmi);
232 hdmi->dev = &pdev->dev;
233
234 hdmi->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
235 if (IS_ERR(hdmi->regmap)) {
236 dev_err(hdmi->dev, "Unable to get gpr\n");
237 return PTR_ERR(hdmi->regmap);
238 }
239
240 hdmi->hdmi = dw_hdmi_probe(pdev, match->data);
241 if (IS_ERR(hdmi->hdmi))
242 return PTR_ERR(hdmi->hdmi);
243
244 hdmi->bridge = of_drm_find_bridge(np);
245 if (!hdmi->bridge) {
246 dev_err(hdmi->dev, "Unable to find bridge\n");
247 dw_hdmi_remove(hdmi->hdmi);
248 return -ENODEV;
249 }
250
251 ret = component_add(&pdev->dev, &dw_hdmi_imx_ops);
252 if (ret)
253 dw_hdmi_remove(hdmi->hdmi);
254
255 return ret;
256 }
257
dw_hdmi_imx_remove(struct platform_device * pdev)258 static void dw_hdmi_imx_remove(struct platform_device *pdev)
259 {
260 struct imx_hdmi *hdmi = platform_get_drvdata(pdev);
261
262 component_del(&pdev->dev, &dw_hdmi_imx_ops);
263 dw_hdmi_remove(hdmi->hdmi);
264 }
265
266 static struct platform_driver dw_hdmi_imx_platform_driver = {
267 .probe = dw_hdmi_imx_probe,
268 .remove = dw_hdmi_imx_remove,
269 .driver = {
270 .name = "dwhdmi-imx",
271 .of_match_table = dw_hdmi_imx_dt_ids,
272 },
273 };
274
275 module_platform_driver(dw_hdmi_imx_platform_driver);
276
277 MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com>");
278 MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
279 MODULE_DESCRIPTION("IMX6 Specific DW-HDMI Driver Extension");
280 MODULE_LICENSE("GPL");
281 MODULE_ALIAS("platform:dwhdmi-imx");
282