1 /* Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
2  *
3  * derived from imx-hdmi.c(renamed to bridge/dw_hdmi.c now)
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  */
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/component.h>
12 #include <linux/mfd/syscon.h>
13 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
14 #include <drm/bridge/dw_hdmi.h>
15 #include <video/imx-ipu-v3.h>
16 #include <linux/regmap.h>
17 #include <drm/drm_of.h>
18 #include <drm/drmP.h>
19 #include <drm/drm_crtc_helper.h>
20 #include <drm/drm_edid.h>
21 #include <drm/drm_encoder_slave.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_disable(struct drm_encoder * encoder)114 static void dw_hdmi_imx_encoder_disable(struct drm_encoder *encoder)
115 {
116 }
117 
dw_hdmi_imx_encoder_enable(struct drm_encoder * encoder)118 static void dw_hdmi_imx_encoder_enable(struct drm_encoder *encoder)
119 {
120 	struct imx_hdmi *hdmi = enc_to_imx_hdmi(encoder);
121 	int mux = drm_of_encoder_active_port_id(hdmi->dev->of_node, encoder);
122 
123 	regmap_update_bits(hdmi->regmap, IOMUXC_GPR3,
124 			   IMX6Q_GPR3_HDMI_MUX_CTL_MASK,
125 			   mux << IMX6Q_GPR3_HDMI_MUX_CTL_SHIFT);
126 }
127 
dw_hdmi_imx_atomic_check(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)128 static int dw_hdmi_imx_atomic_check(struct drm_encoder *encoder,
129 				    struct drm_crtc_state *crtc_state,
130 				    struct drm_connector_state *conn_state)
131 {
132 	struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
133 
134 	imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
135 	imx_crtc_state->di_hsync_pin = 2;
136 	imx_crtc_state->di_vsync_pin = 3;
137 
138 	return 0;
139 }
140 
141 static const struct drm_encoder_helper_funcs dw_hdmi_imx_encoder_helper_funcs = {
142 	.enable     = dw_hdmi_imx_encoder_enable,
143 	.disable    = dw_hdmi_imx_encoder_disable,
144 	.atomic_check = dw_hdmi_imx_atomic_check,
145 };
146 
147 static const struct drm_encoder_funcs dw_hdmi_imx_encoder_funcs = {
148 	.destroy = drm_encoder_cleanup,
149 };
150 
151 static enum drm_mode_status
imx6q_hdmi_mode_valid(struct drm_connector * con,const struct drm_display_mode * mode)152 imx6q_hdmi_mode_valid(struct drm_connector *con,
153 		      const struct drm_display_mode *mode)
154 {
155 	if (mode->clock < 13500)
156 		return MODE_CLOCK_LOW;
157 	/* FIXME: Hardware is capable of 266MHz, but setup data is missing. */
158 	if (mode->clock > 216000)
159 		return MODE_CLOCK_HIGH;
160 
161 	return MODE_OK;
162 }
163 
164 static enum drm_mode_status
imx6dl_hdmi_mode_valid(struct drm_connector * con,const struct drm_display_mode * mode)165 imx6dl_hdmi_mode_valid(struct drm_connector *con,
166 		       const struct drm_display_mode *mode)
167 {
168 	if (mode->clock < 13500)
169 		return MODE_CLOCK_LOW;
170 	/* FIXME: Hardware is capable of 270MHz, but setup data is missing. */
171 	if (mode->clock > 216000)
172 		return MODE_CLOCK_HIGH;
173 
174 	return MODE_OK;
175 }
176 
177 static struct dw_hdmi_plat_data imx6q_hdmi_drv_data = {
178 	.mpll_cfg   = imx_mpll_cfg,
179 	.cur_ctr    = imx_cur_ctr,
180 	.phy_config = imx_phy_config,
181 	.mode_valid = imx6q_hdmi_mode_valid,
182 };
183 
184 static struct dw_hdmi_plat_data imx6dl_hdmi_drv_data = {
185 	.mpll_cfg = imx_mpll_cfg,
186 	.cur_ctr  = imx_cur_ctr,
187 	.phy_config = imx_phy_config,
188 	.mode_valid = imx6dl_hdmi_mode_valid,
189 };
190 
191 static const struct of_device_id dw_hdmi_imx_dt_ids[] = {
192 	{ .compatible = "fsl,imx6q-hdmi",
193 	  .data = &imx6q_hdmi_drv_data
194 	}, {
195 	  .compatible = "fsl,imx6dl-hdmi",
196 	  .data = &imx6dl_hdmi_drv_data
197 	},
198 	{},
199 };
200 MODULE_DEVICE_TABLE(of, dw_hdmi_imx_dt_ids);
201 
dw_hdmi_imx_bind(struct device * dev,struct device * master,void * data)202 static int dw_hdmi_imx_bind(struct device *dev, struct device *master,
203 			    void *data)
204 {
205 	struct platform_device *pdev = to_platform_device(dev);
206 	const struct dw_hdmi_plat_data *plat_data;
207 	const struct of_device_id *match;
208 	struct drm_device *drm = data;
209 	struct drm_encoder *encoder;
210 	struct imx_hdmi *hdmi;
211 	int ret;
212 
213 	if (!pdev->dev.of_node)
214 		return -ENODEV;
215 
216 	hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
217 	if (!hdmi)
218 		return -ENOMEM;
219 
220 	match = of_match_node(dw_hdmi_imx_dt_ids, pdev->dev.of_node);
221 	plat_data = match->data;
222 	hdmi->dev = &pdev->dev;
223 	encoder = &hdmi->encoder;
224 
225 	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
226 	/*
227 	 * If we failed to find the CRTC(s) which this encoder is
228 	 * supposed to be connected to, it's because the CRTC has
229 	 * not been registered yet.  Defer probing, and hope that
230 	 * the required CRTC is added later.
231 	 */
232 	if (encoder->possible_crtcs == 0)
233 		return -EPROBE_DEFER;
234 
235 	ret = dw_hdmi_imx_parse_dt(hdmi);
236 	if (ret < 0)
237 		return ret;
238 
239 	drm_encoder_helper_add(encoder, &dw_hdmi_imx_encoder_helper_funcs);
240 	drm_encoder_init(drm, encoder, &dw_hdmi_imx_encoder_funcs,
241 			 DRM_MODE_ENCODER_TMDS, NULL);
242 
243 	platform_set_drvdata(pdev, hdmi);
244 
245 	hdmi->hdmi = dw_hdmi_bind(pdev, encoder, plat_data);
246 
247 	/*
248 	 * If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),
249 	 * which would have called the encoder cleanup.  Do it manually.
250 	 */
251 	if (IS_ERR(hdmi->hdmi)) {
252 		ret = PTR_ERR(hdmi->hdmi);
253 		drm_encoder_cleanup(encoder);
254 	}
255 
256 	return ret;
257 }
258 
dw_hdmi_imx_unbind(struct device * dev,struct device * master,void * data)259 static void dw_hdmi_imx_unbind(struct device *dev, struct device *master,
260 			       void *data)
261 {
262 	struct imx_hdmi *hdmi = dev_get_drvdata(dev);
263 
264 	dw_hdmi_unbind(hdmi->hdmi);
265 }
266 
267 static const struct component_ops dw_hdmi_imx_ops = {
268 	.bind	= dw_hdmi_imx_bind,
269 	.unbind	= dw_hdmi_imx_unbind,
270 };
271 
dw_hdmi_imx_probe(struct platform_device * pdev)272 static int dw_hdmi_imx_probe(struct platform_device *pdev)
273 {
274 	return component_add(&pdev->dev, &dw_hdmi_imx_ops);
275 }
276 
dw_hdmi_imx_remove(struct platform_device * pdev)277 static int dw_hdmi_imx_remove(struct platform_device *pdev)
278 {
279 	component_del(&pdev->dev, &dw_hdmi_imx_ops);
280 
281 	return 0;
282 }
283 
284 static struct platform_driver dw_hdmi_imx_platform_driver = {
285 	.probe  = dw_hdmi_imx_probe,
286 	.remove = dw_hdmi_imx_remove,
287 	.driver = {
288 		.name = "dwhdmi-imx",
289 		.of_match_table = dw_hdmi_imx_dt_ids,
290 	},
291 };
292 
293 module_platform_driver(dw_hdmi_imx_platform_driver);
294 
295 MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com>");
296 MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
297 MODULE_DESCRIPTION("IMX6 Specific DW-HDMI Driver Extension");
298 MODULE_LICENSE("GPL");
299 MODULE_ALIAS("platform:dwhdmi-imx");
300