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_edid.h>
19 #include <drm/drm_encoder.h>
20 #include <drm/drm_of.h>
21 #include <drm/drm_simple_kms_helper.h>
22
23 #include "imx-drm.h"
24
25 struct imx_hdmi {
26 struct device *dev;
27 struct drm_encoder encoder;
28 struct dw_hdmi *hdmi;
29 struct regmap *regmap;
30 };
31
enc_to_imx_hdmi(struct drm_encoder * e)32 static inline struct imx_hdmi *enc_to_imx_hdmi(struct drm_encoder *e)
33 {
34 return container_of(e, struct imx_hdmi, encoder);
35 }
36
37 static const struct dw_hdmi_mpll_config imx_mpll_cfg[] = {
38 {
39 45250000, {
40 { 0x01e0, 0x0000 },
41 { 0x21e1, 0x0000 },
42 { 0x41e2, 0x0000 }
43 },
44 }, {
45 92500000, {
46 { 0x0140, 0x0005 },
47 { 0x2141, 0x0005 },
48 { 0x4142, 0x0005 },
49 },
50 }, {
51 148500000, {
52 { 0x00a0, 0x000a },
53 { 0x20a1, 0x000a },
54 { 0x40a2, 0x000a },
55 },
56 }, {
57 216000000, {
58 { 0x00a0, 0x000a },
59 { 0x2001, 0x000f },
60 { 0x4002, 0x000f },
61 },
62 }, {
63 ~0UL, {
64 { 0x0000, 0x0000 },
65 { 0x0000, 0x0000 },
66 { 0x0000, 0x0000 },
67 },
68 }
69 };
70
71 static const struct dw_hdmi_curr_ctrl imx_cur_ctr[] = {
72 /* pixelclk bpp8 bpp10 bpp12 */
73 {
74 54000000, { 0x091c, 0x091c, 0x06dc },
75 }, {
76 58400000, { 0x091c, 0x06dc, 0x06dc },
77 }, {
78 72000000, { 0x06dc, 0x06dc, 0x091c },
79 }, {
80 74250000, { 0x06dc, 0x0b5c, 0x091c },
81 }, {
82 118800000, { 0x091c, 0x091c, 0x06dc },
83 }, {
84 216000000, { 0x06dc, 0x0b5c, 0x091c },
85 }, {
86 ~0UL, { 0x0000, 0x0000, 0x0000 },
87 },
88 };
89
90 /*
91 * Resistance term 133Ohm Cfg
92 * PREEMP config 0.00
93 * TX/CK level 10
94 */
95 static const struct dw_hdmi_phy_config imx_phy_config[] = {
96 /*pixelclk symbol term vlev */
97 { 216000000, 0x800d, 0x0005, 0x01ad},
98 { ~0UL, 0x0000, 0x0000, 0x0000}
99 };
100
dw_hdmi_imx_parse_dt(struct imx_hdmi * hdmi)101 static int dw_hdmi_imx_parse_dt(struct imx_hdmi *hdmi)
102 {
103 struct device_node *np = hdmi->dev->of_node;
104
105 hdmi->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
106 if (IS_ERR(hdmi->regmap)) {
107 dev_err(hdmi->dev, "Unable to get gpr\n");
108 return PTR_ERR(hdmi->regmap);
109 }
110
111 return 0;
112 }
113
dw_hdmi_imx_encoder_enable(struct drm_encoder * encoder)114 static void dw_hdmi_imx_encoder_enable(struct drm_encoder *encoder)
115 {
116 struct imx_hdmi *hdmi = enc_to_imx_hdmi(encoder);
117 int mux = drm_of_encoder_active_port_id(hdmi->dev->of_node, encoder);
118
119 regmap_update_bits(hdmi->regmap, IOMUXC_GPR3,
120 IMX6Q_GPR3_HDMI_MUX_CTL_MASK,
121 mux << IMX6Q_GPR3_HDMI_MUX_CTL_SHIFT);
122 }
123
dw_hdmi_imx_atomic_check(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)124 static int dw_hdmi_imx_atomic_check(struct drm_encoder *encoder,
125 struct drm_crtc_state *crtc_state,
126 struct drm_connector_state *conn_state)
127 {
128 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
129
130 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
131 imx_crtc_state->di_hsync_pin = 2;
132 imx_crtc_state->di_vsync_pin = 3;
133
134 return 0;
135 }
136
137 static const struct drm_encoder_helper_funcs dw_hdmi_imx_encoder_helper_funcs = {
138 .enable = dw_hdmi_imx_encoder_enable,
139 .atomic_check = dw_hdmi_imx_atomic_check,
140 };
141
142 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)143 imx6q_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
144 const struct drm_display_info *info,
145 const struct drm_display_mode *mode)
146 {
147 if (mode->clock < 13500)
148 return MODE_CLOCK_LOW;
149 /* FIXME: Hardware is capable of 266MHz, but setup data is missing. */
150 if (mode->clock > 216000)
151 return MODE_CLOCK_HIGH;
152
153 return MODE_OK;
154 }
155
156 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)157 imx6dl_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
158 const struct drm_display_info *info,
159 const struct drm_display_mode *mode)
160 {
161 if (mode->clock < 13500)
162 return MODE_CLOCK_LOW;
163 /* FIXME: Hardware is capable of 270MHz, but setup data is missing. */
164 if (mode->clock > 216000)
165 return MODE_CLOCK_HIGH;
166
167 return MODE_OK;
168 }
169
170 static struct dw_hdmi_plat_data imx6q_hdmi_drv_data = {
171 .mpll_cfg = imx_mpll_cfg,
172 .cur_ctr = imx_cur_ctr,
173 .phy_config = imx_phy_config,
174 .mode_valid = imx6q_hdmi_mode_valid,
175 };
176
177 static struct dw_hdmi_plat_data imx6dl_hdmi_drv_data = {
178 .mpll_cfg = imx_mpll_cfg,
179 .cur_ctr = imx_cur_ctr,
180 .phy_config = imx_phy_config,
181 .mode_valid = imx6dl_hdmi_mode_valid,
182 };
183
184 static const struct of_device_id dw_hdmi_imx_dt_ids[] = {
185 { .compatible = "fsl,imx6q-hdmi",
186 .data = &imx6q_hdmi_drv_data
187 }, {
188 .compatible = "fsl,imx6dl-hdmi",
189 .data = &imx6dl_hdmi_drv_data
190 },
191 {},
192 };
193 MODULE_DEVICE_TABLE(of, dw_hdmi_imx_dt_ids);
194
dw_hdmi_imx_bind(struct device * dev,struct device * master,void * data)195 static int dw_hdmi_imx_bind(struct device *dev, struct device *master,
196 void *data)
197 {
198 struct platform_device *pdev = to_platform_device(dev);
199 const struct dw_hdmi_plat_data *plat_data;
200 const struct of_device_id *match;
201 struct drm_device *drm = data;
202 struct drm_encoder *encoder;
203 struct imx_hdmi *hdmi;
204 int ret;
205
206 if (!pdev->dev.of_node)
207 return -ENODEV;
208
209 hdmi = dev_get_drvdata(dev);
210 memset(hdmi, 0, sizeof(*hdmi));
211
212 match = of_match_node(dw_hdmi_imx_dt_ids, pdev->dev.of_node);
213 plat_data = match->data;
214 hdmi->dev = &pdev->dev;
215 encoder = &hdmi->encoder;
216
217 ret = imx_drm_encoder_parse_of(drm, encoder, dev->of_node);
218 if (ret)
219 return ret;
220
221 ret = dw_hdmi_imx_parse_dt(hdmi);
222 if (ret < 0)
223 return ret;
224
225 drm_encoder_helper_add(encoder, &dw_hdmi_imx_encoder_helper_funcs);
226 drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
227
228 hdmi->hdmi = dw_hdmi_bind(pdev, encoder, plat_data);
229
230 /*
231 * If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),
232 * which would have called the encoder cleanup. Do it manually.
233 */
234 if (IS_ERR(hdmi->hdmi)) {
235 ret = PTR_ERR(hdmi->hdmi);
236 drm_encoder_cleanup(encoder);
237 }
238
239 return ret;
240 }
241
dw_hdmi_imx_unbind(struct device * dev,struct device * master,void * data)242 static void dw_hdmi_imx_unbind(struct device *dev, struct device *master,
243 void *data)
244 {
245 struct imx_hdmi *hdmi = dev_get_drvdata(dev);
246
247 dw_hdmi_unbind(hdmi->hdmi);
248 }
249
250 static const struct component_ops dw_hdmi_imx_ops = {
251 .bind = dw_hdmi_imx_bind,
252 .unbind = dw_hdmi_imx_unbind,
253 };
254
dw_hdmi_imx_probe(struct platform_device * pdev)255 static int dw_hdmi_imx_probe(struct platform_device *pdev)
256 {
257 struct imx_hdmi *hdmi;
258
259 hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
260 if (!hdmi)
261 return -ENOMEM;
262
263 platform_set_drvdata(pdev, hdmi);
264
265 return component_add(&pdev->dev, &dw_hdmi_imx_ops);
266 }
267
dw_hdmi_imx_remove(struct platform_device * pdev)268 static int dw_hdmi_imx_remove(struct platform_device *pdev)
269 {
270 component_del(&pdev->dev, &dw_hdmi_imx_ops);
271
272 return 0;
273 }
274
275 static struct platform_driver dw_hdmi_imx_platform_driver = {
276 .probe = dw_hdmi_imx_probe,
277 .remove = dw_hdmi_imx_remove,
278 .driver = {
279 .name = "dwhdmi-imx",
280 .of_match_table = dw_hdmi_imx_dt_ids,
281 },
282 };
283
284 module_platform_driver(dw_hdmi_imx_platform_driver);
285
286 MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com>");
287 MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
288 MODULE_DESCRIPTION("IMX6 Specific DW-HDMI Driver Extension");
289 MODULE_LICENSE("GPL");
290 MODULE_ALIAS("platform:dwhdmi-imx");
291