1 /*
2 * Copyright (C) 2013 Red Hat
3 * Author: Rob Clark <robdclark@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 #include <linux/gpio.h>
19
20 #include "msm_kms.h"
21 #include "hdmi.h"
22
23 struct hdmi_connector {
24 struct drm_connector base;
25 struct hdmi *hdmi;
26 struct work_struct hpd_work;
27 };
28 #define to_hdmi_connector(x) container_of(x, struct hdmi_connector, base)
29
gpio_config(struct hdmi * hdmi,bool on)30 static int gpio_config(struct hdmi *hdmi, bool on)
31 {
32 struct drm_device *dev = hdmi->dev;
33 const struct hdmi_platform_config *config = hdmi->config;
34 int ret;
35
36 if (on) {
37 ret = gpio_request(config->ddc_clk_gpio, "HDMI_DDC_CLK");
38 if (ret) {
39 dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
40 "HDMI_DDC_CLK", config->ddc_clk_gpio, ret);
41 goto error1;
42 }
43 gpio_set_value_cansleep(config->ddc_clk_gpio, 1);
44
45 ret = gpio_request(config->ddc_data_gpio, "HDMI_DDC_DATA");
46 if (ret) {
47 dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
48 "HDMI_DDC_DATA", config->ddc_data_gpio, ret);
49 goto error2;
50 }
51 gpio_set_value_cansleep(config->ddc_data_gpio, 1);
52
53 ret = gpio_request(config->hpd_gpio, "HDMI_HPD");
54 if (ret) {
55 dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
56 "HDMI_HPD", config->hpd_gpio, ret);
57 goto error3;
58 }
59 gpio_direction_input(config->hpd_gpio);
60 gpio_set_value_cansleep(config->hpd_gpio, 1);
61
62 if (config->mux_en_gpio != -1) {
63 ret = gpio_request(config->mux_en_gpio, "HDMI_MUX_EN");
64 if (ret) {
65 dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
66 "HDMI_MUX_EN", config->mux_en_gpio, ret);
67 goto error4;
68 }
69 gpio_set_value_cansleep(config->mux_en_gpio, 1);
70 }
71
72 if (config->mux_sel_gpio != -1) {
73 ret = gpio_request(config->mux_sel_gpio, "HDMI_MUX_SEL");
74 if (ret) {
75 dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
76 "HDMI_MUX_SEL", config->mux_sel_gpio, ret);
77 goto error5;
78 }
79 gpio_set_value_cansleep(config->mux_sel_gpio, 0);
80 }
81
82 if (config->mux_lpm_gpio != -1) {
83 ret = gpio_request(config->mux_lpm_gpio,
84 "HDMI_MUX_LPM");
85 if (ret) {
86 dev_err(dev->dev,
87 "'%s'(%d) gpio_request failed: %d\n",
88 "HDMI_MUX_LPM",
89 config->mux_lpm_gpio, ret);
90 goto error6;
91 }
92 gpio_set_value_cansleep(config->mux_lpm_gpio, 1);
93 }
94 DBG("gpio on");
95 } else {
96 gpio_free(config->ddc_clk_gpio);
97 gpio_free(config->ddc_data_gpio);
98 gpio_free(config->hpd_gpio);
99
100 if (config->mux_en_gpio != -1) {
101 gpio_set_value_cansleep(config->mux_en_gpio, 0);
102 gpio_free(config->mux_en_gpio);
103 }
104
105 if (config->mux_sel_gpio != -1) {
106 gpio_set_value_cansleep(config->mux_sel_gpio, 1);
107 gpio_free(config->mux_sel_gpio);
108 }
109
110 if (config->mux_lpm_gpio != -1) {
111 gpio_set_value_cansleep(config->mux_lpm_gpio, 0);
112 gpio_free(config->mux_lpm_gpio);
113 }
114 DBG("gpio off");
115 }
116
117 return 0;
118
119 error6:
120 if (config->mux_sel_gpio != -1)
121 gpio_free(config->mux_sel_gpio);
122 error5:
123 if (config->mux_en_gpio != -1)
124 gpio_free(config->mux_en_gpio);
125 error4:
126 gpio_free(config->hpd_gpio);
127 error3:
128 gpio_free(config->ddc_data_gpio);
129 error2:
130 gpio_free(config->ddc_clk_gpio);
131 error1:
132 return ret;
133 }
134
hpd_enable(struct hdmi_connector * hdmi_connector)135 static int hpd_enable(struct hdmi_connector *hdmi_connector)
136 {
137 struct hdmi *hdmi = hdmi_connector->hdmi;
138 const struct hdmi_platform_config *config = hdmi->config;
139 struct drm_device *dev = hdmi_connector->base.dev;
140 struct hdmi_phy *phy = hdmi->phy;
141 uint32_t hpd_ctrl;
142 int i, ret;
143
144 for (i = 0; i < config->hpd_reg_cnt; i++) {
145 ret = regulator_enable(hdmi->hpd_regs[i]);
146 if (ret) {
147 dev_err(dev->dev, "failed to enable hpd regulator: %s (%d)\n",
148 config->hpd_reg_names[i], ret);
149 goto fail;
150 }
151 }
152
153 ret = gpio_config(hdmi, true);
154 if (ret) {
155 dev_err(dev->dev, "failed to configure GPIOs: %d\n", ret);
156 goto fail;
157 }
158
159 for (i = 0; i < config->hpd_clk_cnt; i++) {
160 if (config->hpd_freq && config->hpd_freq[i]) {
161 ret = clk_set_rate(hdmi->hpd_clks[i],
162 config->hpd_freq[i]);
163 if (ret)
164 dev_warn(dev->dev, "failed to set clk %s (%d)\n",
165 config->hpd_clk_names[i], ret);
166 }
167
168 ret = clk_prepare_enable(hdmi->hpd_clks[i]);
169 if (ret) {
170 dev_err(dev->dev, "failed to enable hpd clk: %s (%d)\n",
171 config->hpd_clk_names[i], ret);
172 goto fail;
173 }
174 }
175
176 hdmi_set_mode(hdmi, false);
177 phy->funcs->reset(phy);
178 hdmi_set_mode(hdmi, true);
179
180 hdmi_write(hdmi, REG_HDMI_USEC_REFTIMER, 0x0001001b);
181
182 /* enable HPD events: */
183 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
184 HDMI_HPD_INT_CTRL_INT_CONNECT |
185 HDMI_HPD_INT_CTRL_INT_EN);
186
187 /* set timeout to 4.1ms (max) for hardware debounce */
188 hpd_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
189 hpd_ctrl |= HDMI_HPD_CTRL_TIMEOUT(0x1fff);
190
191 /* Toggle HPD circuit to trigger HPD sense */
192 hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
193 ~HDMI_HPD_CTRL_ENABLE & hpd_ctrl);
194 hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
195 HDMI_HPD_CTRL_ENABLE | hpd_ctrl);
196
197 return 0;
198
199 fail:
200 return ret;
201 }
202
hdp_disable(struct hdmi_connector * hdmi_connector)203 static void hdp_disable(struct hdmi_connector *hdmi_connector)
204 {
205 struct hdmi *hdmi = hdmi_connector->hdmi;
206 const struct hdmi_platform_config *config = hdmi->config;
207 struct drm_device *dev = hdmi_connector->base.dev;
208 int i, ret = 0;
209
210 /* Disable HPD interrupt */
211 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, 0);
212
213 hdmi_set_mode(hdmi, false);
214
215 for (i = 0; i < config->hpd_clk_cnt; i++)
216 clk_disable_unprepare(hdmi->hpd_clks[i]);
217
218 ret = gpio_config(hdmi, false);
219 if (ret)
220 dev_warn(dev->dev, "failed to unconfigure GPIOs: %d\n", ret);
221
222 for (i = 0; i < config->hpd_reg_cnt; i++) {
223 ret = regulator_disable(hdmi->hpd_regs[i]);
224 if (ret)
225 dev_warn(dev->dev, "failed to disable hpd regulator: %s (%d)\n",
226 config->hpd_reg_names[i], ret);
227 }
228 }
229
230 static void
hotplug_work(struct work_struct * work)231 hotplug_work(struct work_struct *work)
232 {
233 struct hdmi_connector *hdmi_connector =
234 container_of(work, struct hdmi_connector, hpd_work);
235 struct drm_connector *connector = &hdmi_connector->base;
236 drm_helper_hpd_irq_event(connector->dev);
237 }
238
hdmi_connector_irq(struct drm_connector * connector)239 void hdmi_connector_irq(struct drm_connector *connector)
240 {
241 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
242 struct msm_drm_private *priv = connector->dev->dev_private;
243 struct hdmi *hdmi = hdmi_connector->hdmi;
244 uint32_t hpd_int_status, hpd_int_ctrl;
245
246 /* Process HPD: */
247 hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
248 hpd_int_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_INT_CTRL);
249
250 if ((hpd_int_ctrl & HDMI_HPD_INT_CTRL_INT_EN) &&
251 (hpd_int_status & HDMI_HPD_INT_STATUS_INT)) {
252 bool detected = !!(hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED);
253
254 /* ack & disable (temporarily) HPD events: */
255 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
256 HDMI_HPD_INT_CTRL_INT_ACK);
257
258 DBG("status=%04x, ctrl=%04x", hpd_int_status, hpd_int_ctrl);
259
260 /* detect disconnect if we are connected or visa versa: */
261 hpd_int_ctrl = HDMI_HPD_INT_CTRL_INT_EN;
262 if (!detected)
263 hpd_int_ctrl |= HDMI_HPD_INT_CTRL_INT_CONNECT;
264 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, hpd_int_ctrl);
265
266 queue_work(priv->wq, &hdmi_connector->hpd_work);
267 }
268 }
269
detect_reg(struct hdmi * hdmi)270 static enum drm_connector_status detect_reg(struct hdmi *hdmi)
271 {
272 uint32_t hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
273 return (hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED) ?
274 connector_status_connected : connector_status_disconnected;
275 }
276
detect_gpio(struct hdmi * hdmi)277 static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
278 {
279 const struct hdmi_platform_config *config = hdmi->config;
280 return gpio_get_value(config->hpd_gpio) ?
281 connector_status_connected :
282 connector_status_disconnected;
283 }
284
hdmi_connector_detect(struct drm_connector * connector,bool force)285 static enum drm_connector_status hdmi_connector_detect(
286 struct drm_connector *connector, bool force)
287 {
288 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
289 struct hdmi *hdmi = hdmi_connector->hdmi;
290 enum drm_connector_status stat_gpio, stat_reg;
291 int retry = 20;
292
293 do {
294 stat_gpio = detect_gpio(hdmi);
295 stat_reg = detect_reg(hdmi);
296
297 if (stat_gpio == stat_reg)
298 break;
299
300 mdelay(10);
301 } while (--retry);
302
303 /* the status we get from reading gpio seems to be more reliable,
304 * so trust that one the most if we didn't manage to get hdmi and
305 * gpio status to agree:
306 */
307 if (stat_gpio != stat_reg) {
308 DBG("HDMI_HPD_INT_STATUS tells us: %d", stat_reg);
309 DBG("hpd gpio tells us: %d", stat_gpio);
310 }
311
312 return stat_gpio;
313 }
314
hdmi_connector_destroy(struct drm_connector * connector)315 static void hdmi_connector_destroy(struct drm_connector *connector)
316 {
317 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
318
319 hdp_disable(hdmi_connector);
320
321 drm_connector_unregister(connector);
322 drm_connector_cleanup(connector);
323
324 kfree(hdmi_connector);
325 }
326
hdmi_connector_get_modes(struct drm_connector * connector)327 static int hdmi_connector_get_modes(struct drm_connector *connector)
328 {
329 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
330 struct hdmi *hdmi = hdmi_connector->hdmi;
331 struct edid *edid;
332 uint32_t hdmi_ctrl;
333 int ret = 0;
334
335 hdmi_ctrl = hdmi_read(hdmi, REG_HDMI_CTRL);
336 hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl | HDMI_CTRL_ENABLE);
337
338 edid = drm_get_edid(connector, hdmi->i2c);
339
340 hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl);
341
342 drm_mode_connector_update_edid_property(connector, edid);
343
344 if (edid) {
345 ret = drm_add_edid_modes(connector, edid);
346 kfree(edid);
347 }
348
349 return ret;
350 }
351
hdmi_connector_mode_valid(struct drm_connector * connector,struct drm_display_mode * mode)352 static int hdmi_connector_mode_valid(struct drm_connector *connector,
353 struct drm_display_mode *mode)
354 {
355 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
356 struct hdmi *hdmi = hdmi_connector->hdmi;
357 const struct hdmi_platform_config *config = hdmi->config;
358 struct msm_drm_private *priv = connector->dev->dev_private;
359 struct msm_kms *kms = priv->kms;
360 long actual, requested;
361
362 requested = 1000 * mode->clock;
363 actual = kms->funcs->round_pixclk(kms,
364 requested, hdmi_connector->hdmi->encoder);
365
366 /* for mdp5/apq8074, we manage our own pixel clk (as opposed to
367 * mdp4/dtv stuff where pixel clk is assigned to mdp/encoder
368 * instead):
369 */
370 if (config->pwr_clk_cnt > 0)
371 actual = clk_round_rate(hdmi->pwr_clks[0], actual);
372
373 DBG("requested=%ld, actual=%ld", requested, actual);
374
375 if (actual != requested)
376 return MODE_CLOCK_RANGE;
377
378 return 0;
379 }
380
381 static struct drm_encoder *
hdmi_connector_best_encoder(struct drm_connector * connector)382 hdmi_connector_best_encoder(struct drm_connector *connector)
383 {
384 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
385 return hdmi_connector->hdmi->encoder;
386 }
387
388 static const struct drm_connector_funcs hdmi_connector_funcs = {
389 .dpms = drm_atomic_helper_connector_dpms,
390 .detect = hdmi_connector_detect,
391 .fill_modes = drm_helper_probe_single_connector_modes,
392 .destroy = hdmi_connector_destroy,
393 .reset = drm_atomic_helper_connector_reset,
394 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
395 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
396 };
397
398 static const struct drm_connector_helper_funcs hdmi_connector_helper_funcs = {
399 .get_modes = hdmi_connector_get_modes,
400 .mode_valid = hdmi_connector_mode_valid,
401 .best_encoder = hdmi_connector_best_encoder,
402 };
403
404 /* initialize connector */
hdmi_connector_init(struct hdmi * hdmi)405 struct drm_connector *hdmi_connector_init(struct hdmi *hdmi)
406 {
407 struct drm_connector *connector = NULL;
408 struct hdmi_connector *hdmi_connector;
409 int ret;
410
411 hdmi_connector = kzalloc(sizeof(*hdmi_connector), GFP_KERNEL);
412 if (!hdmi_connector) {
413 ret = -ENOMEM;
414 goto fail;
415 }
416
417 hdmi_connector->hdmi = hdmi;
418 INIT_WORK(&hdmi_connector->hpd_work, hotplug_work);
419
420 connector = &hdmi_connector->base;
421
422 drm_connector_init(hdmi->dev, connector, &hdmi_connector_funcs,
423 DRM_MODE_CONNECTOR_HDMIA);
424 drm_connector_helper_add(connector, &hdmi_connector_helper_funcs);
425
426 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
427 DRM_CONNECTOR_POLL_DISCONNECT;
428
429 connector->interlace_allowed = 0;
430 connector->doublescan_allowed = 0;
431
432 drm_connector_register(connector);
433
434 ret = hpd_enable(hdmi_connector);
435 if (ret) {
436 dev_err(hdmi->dev->dev, "failed to enable HPD: %d\n", ret);
437 goto fail;
438 }
439
440 drm_mode_connector_attach_encoder(connector, hdmi->encoder);
441
442 return connector;
443
444 fail:
445 if (connector)
446 hdmi_connector_destroy(connector);
447
448 return ERR_PTR(ret);
449 }
450