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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#include <linux/pinctrl/consumer.h>
20
21#include "msm_kms.h"
22#include "hdmi.h"
23
24struct hdmi_connector {
25 struct drm_connector base;
26 struct hdmi *hdmi;
27 struct work_struct hpd_work;
28};
29#define to_hdmi_connector(x) container_of(x, struct hdmi_connector, base)
30
31static void msm_hdmi_phy_reset(struct hdmi *hdmi)
32{
33 unsigned int val;
34
35 val = hdmi_read(hdmi, REG_HDMI_PHY_CTRL);
36
37 if (val & HDMI_PHY_CTRL_SW_RESET_LOW) {
38 /* pull low */
39 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
40 val & ~HDMI_PHY_CTRL_SW_RESET);
41 } else {
42 /* pull high */
43 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
44 val | HDMI_PHY_CTRL_SW_RESET);
45 }
46
47 if (val & HDMI_PHY_CTRL_SW_RESET_PLL_LOW) {
48 /* pull low */
49 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
50 val & ~HDMI_PHY_CTRL_SW_RESET_PLL);
51 } else {
52 /* pull high */
53 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
54 val | HDMI_PHY_CTRL_SW_RESET_PLL);
55 }
56
57 msleep(100);
58
59 if (val & HDMI_PHY_CTRL_SW_RESET_LOW) {
60 /* pull high */
61 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
62 val | HDMI_PHY_CTRL_SW_RESET);
63 } else {
64 /* pull low */
65 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
66 val & ~HDMI_PHY_CTRL_SW_RESET);
67 }
68
69 if (val & HDMI_PHY_CTRL_SW_RESET_PLL_LOW) {
70 /* pull high */
71 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
72 val | HDMI_PHY_CTRL_SW_RESET_PLL);
73 } else {
74 /* pull low */
75 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
76 val & ~HDMI_PHY_CTRL_SW_RESET_PLL);
77 }
78}
79
80static int gpio_config(struct hdmi *hdmi, bool on)
81{
82 struct device *dev = &hdmi->pdev->dev;
83 const struct hdmi_platform_config *config = hdmi->config;
84 int ret, i;
85
86 if (on) {
87 for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
88 struct hdmi_gpio_data gpio = config->gpios[i];
89
90 if (gpio.num != -1) {
91 ret = gpio_request(gpio.num, gpio.label);
92 if (ret) {
93 dev_err(dev,
94 "'%s'(%d) gpio_request failed: %d\n",
95 gpio.label, gpio.num, ret);
96 goto err;
97 }
98
99 if (gpio.output) {
100 gpio_direction_output(gpio.num,
101 gpio.value);
102 } else {
103 gpio_direction_input(gpio.num);
104 gpio_set_value_cansleep(gpio.num,
105 gpio.value);
106 }
107 }
108 }
109
110 DBG("gpio on");
111 } else {
112 for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
113 struct hdmi_gpio_data gpio = config->gpios[i];
114
115 if (gpio.num == -1)
116 continue;
117
118 if (gpio.output) {
119 int value = gpio.value ? 0 : 1;
120
121 gpio_set_value_cansleep(gpio.num, value);
122 }
123
124 gpio_free(gpio.num);
125 };
126
127 DBG("gpio off");
128 }
129
130 return 0;
131err:
132 while (i--) {
133 if (config->gpios[i].num != -1)
134 gpio_free(config->gpios[i].num);
135 }
136
137 return ret;
138}
139
140static void enable_hpd_clocks(struct hdmi *hdmi, bool enable)
141{
142 const struct hdmi_platform_config *config = hdmi->config;
143 struct device *dev = &hdmi->pdev->dev;
144 int i, ret;
145
146 if (enable) {
147 for (i = 0; i < config->hpd_clk_cnt; i++) {
148 if (config->hpd_freq && config->hpd_freq[i]) {
149 ret = clk_set_rate(hdmi->hpd_clks[i],
150 config->hpd_freq[i]);
151 if (ret)
152 dev_warn(dev,
153 "failed to set clk %s (%d)\n",
154 config->hpd_clk_names[i], ret);
155 }
156
157 ret = clk_prepare_enable(hdmi->hpd_clks[i]);
158 if (ret) {
159 dev_err(dev,
160 "failed to enable hpd clk: %s (%d)\n",
161 config->hpd_clk_names[i], ret);
162 }
163 }
164 } else {
165 for (i = config->hpd_clk_cnt - 1; i >= 0; i--)
166 clk_disable_unprepare(hdmi->hpd_clks[i]);
167 }
168}
169
170static int hpd_enable(struct hdmi_connector *hdmi_connector)
171{
172 struct hdmi *hdmi = hdmi_connector->hdmi;
173 const struct hdmi_platform_config *config = hdmi->config;
174 struct device *dev = &hdmi->pdev->dev;
175 uint32_t hpd_ctrl;
176 int i, ret;
177 unsigned long flags;
178
179 for (i = 0; i < config->hpd_reg_cnt; i++) {
180 ret = regulator_enable(hdmi->hpd_regs[i]);
181 if (ret) {
182 dev_err(dev, "failed to enable hpd regulator: %s (%d)\n",
183 config->hpd_reg_names[i], ret);
184 goto fail;
185 }
186 }
187
188 ret = pinctrl_pm_select_default_state(dev);
189 if (ret) {
190 dev_err(dev, "pinctrl state chg failed: %d\n", ret);
191 goto fail;
192 }
193
194 ret = gpio_config(hdmi, true);
195 if (ret) {
196 dev_err(dev, "failed to configure GPIOs: %d\n", ret);
197 goto fail;
198 }
199
200 pm_runtime_get_sync(dev);
201 enable_hpd_clocks(hdmi, true);
202
203 msm_hdmi_set_mode(hdmi, false);
204 msm_hdmi_phy_reset(hdmi);
205 msm_hdmi_set_mode(hdmi, true);
206
207 hdmi_write(hdmi, REG_HDMI_USEC_REFTIMER, 0x0001001b);
208
209 /* enable HPD events: */
210 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
211 HDMI_HPD_INT_CTRL_INT_CONNECT |
212 HDMI_HPD_INT_CTRL_INT_EN);
213
214 /* set timeout to 4.1ms (max) for hardware debounce */
215 spin_lock_irqsave(&hdmi->reg_lock, flags);
216 hpd_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
217 hpd_ctrl |= HDMI_HPD_CTRL_TIMEOUT(0x1fff);
218
219 /* Toggle HPD circuit to trigger HPD sense */
220 hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
221 ~HDMI_HPD_CTRL_ENABLE & hpd_ctrl);
222 hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
223 HDMI_HPD_CTRL_ENABLE | hpd_ctrl);
224 spin_unlock_irqrestore(&hdmi->reg_lock, flags);
225
226 return 0;
227
228fail:
229 return ret;
230}
231
232static void hdp_disable(struct hdmi_connector *hdmi_connector)
233{
234 struct hdmi *hdmi = hdmi_connector->hdmi;
235 const struct hdmi_platform_config *config = hdmi->config;
236 struct device *dev = &hdmi->pdev->dev;
237 int i, ret = 0;
238
239 /* Disable HPD interrupt */
240 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, 0);
241
242 msm_hdmi_set_mode(hdmi, false);
243
244 enable_hpd_clocks(hdmi, false);
245 pm_runtime_put_autosuspend(dev);
246
247 ret = gpio_config(hdmi, false);
248 if (ret)
249 dev_warn(dev, "failed to unconfigure GPIOs: %d\n", ret);
250
251 ret = pinctrl_pm_select_sleep_state(dev);
252 if (ret)
253 dev_warn(dev, "pinctrl state chg failed: %d\n", ret);
254
255 for (i = 0; i < config->hpd_reg_cnt; i++) {
256 ret = regulator_disable(hdmi->hpd_regs[i]);
257 if (ret)
258 dev_warn(dev, "failed to disable hpd regulator: %s (%d)\n",
259 config->hpd_reg_names[i], ret);
260 }
261}
262
263static void
264msm_hdmi_hotplug_work(struct work_struct *work)
265{
266 struct hdmi_connector *hdmi_connector =
267 container_of(work, struct hdmi_connector, hpd_work);
268 struct drm_connector *connector = &hdmi_connector->base;
269 drm_helper_hpd_irq_event(connector->dev);
270}
271
272void msm_hdmi_connector_irq(struct drm_connector *connector)
273{
274 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
275 struct hdmi *hdmi = hdmi_connector->hdmi;
276 uint32_t hpd_int_status, hpd_int_ctrl;
277
278 /* Process HPD: */
279 hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
280 hpd_int_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_INT_CTRL);
281
282 if ((hpd_int_ctrl & HDMI_HPD_INT_CTRL_INT_EN) &&
283 (hpd_int_status & HDMI_HPD_INT_STATUS_INT)) {
284 bool detected = !!(hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED);
285
286 /* ack & disable (temporarily) HPD events: */
287 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
288 HDMI_HPD_INT_CTRL_INT_ACK);
289
290 DBG("status=%04x, ctrl=%04x", hpd_int_status, hpd_int_ctrl);
291
292 /* detect disconnect if we are connected or visa versa: */
293 hpd_int_ctrl = HDMI_HPD_INT_CTRL_INT_EN;
294 if (!detected)
295 hpd_int_ctrl |= HDMI_HPD_INT_CTRL_INT_CONNECT;
296 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, hpd_int_ctrl);
297
298 queue_work(hdmi->workq, &hdmi_connector->hpd_work);
299 }
300}
301
302static enum drm_connector_status detect_reg(struct hdmi *hdmi)
303{
304 uint32_t hpd_int_status;
305
306 pm_runtime_get_sync(&hdmi->pdev->dev);
307 enable_hpd_clocks(hdmi, true);
308
309 hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
310
311 enable_hpd_clocks(hdmi, false);
312 pm_runtime_put_autosuspend(&hdmi->pdev->dev);
313
314 return (hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED) ?
315 connector_status_connected : connector_status_disconnected;
316}
317
318#define HPD_GPIO_INDEX 2
319static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
320{
321 const struct hdmi_platform_config *config = hdmi->config;
322 struct hdmi_gpio_data hpd_gpio = config->gpios[HPD_GPIO_INDEX];
323
324 return gpio_get_value(hpd_gpio.num) ?
325 connector_status_connected :
326 connector_status_disconnected;
327}
328
329static enum drm_connector_status hdmi_connector_detect(
330 struct drm_connector *connector, bool force)
331{
332 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
333 struct hdmi *hdmi = hdmi_connector->hdmi;
334 const struct hdmi_platform_config *config = hdmi->config;
335 struct hdmi_gpio_data hpd_gpio = config->gpios[HPD_GPIO_INDEX];
336 enum drm_connector_status stat_gpio, stat_reg;
337 int retry = 20;
338
339 /*
340 * some platforms may not have hpd gpio. Rely only on the status
341 * provided by REG_HDMI_HPD_INT_STATUS in this case.
342 */
343 if (hpd_gpio.num == -1)
344 return detect_reg(hdmi);
345
346 do {
347 stat_gpio = detect_gpio(hdmi);
348 stat_reg = detect_reg(hdmi);
349
350 if (stat_gpio == stat_reg)
351 break;
352
353 mdelay(10);
354 } while (--retry);
355
356 /* the status we get from reading gpio seems to be more reliable,
357 * so trust that one the most if we didn't manage to get hdmi and
358 * gpio status to agree:
359 */
360 if (stat_gpio != stat_reg) {
361 DBG("HDMI_HPD_INT_STATUS tells us: %d", stat_reg);
362 DBG("hpd gpio tells us: %d", stat_gpio);
363 }
364
365 return stat_gpio;
366}
367
368static void hdmi_connector_destroy(struct drm_connector *connector)
369{
370 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
371
372 hdp_disable(hdmi_connector);
373
374 drm_connector_cleanup(connector);
375
376 kfree(hdmi_connector);
377}
378
379static int msm_hdmi_connector_get_modes(struct drm_connector *connector)
380{
381 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
382 struct hdmi *hdmi = hdmi_connector->hdmi;
383 struct edid *edid;
384 uint32_t hdmi_ctrl;
385 int ret = 0;
386
387 hdmi_ctrl = hdmi_read(hdmi, REG_HDMI_CTRL);
388 hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl | HDMI_CTRL_ENABLE);
389
390 edid = drm_get_edid(connector, hdmi->i2c);
391
392 hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl);
393
394 hdmi->hdmi_mode = drm_detect_hdmi_monitor(edid);
395 drm_mode_connector_update_edid_property(connector, edid);
396
397 if (edid) {
398 ret = drm_add_edid_modes(connector, edid);
399 kfree(edid);
400 }
401
402 return ret;
403}
404
405static int msm_hdmi_connector_mode_valid(struct drm_connector *connector,
406 struct drm_display_mode *mode)
407{
408 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
409 struct hdmi *hdmi = hdmi_connector->hdmi;
410 const struct hdmi_platform_config *config = hdmi->config;
411 struct msm_drm_private *priv = connector->dev->dev_private;
412 struct msm_kms *kms = priv->kms;
413 long actual, requested;
414
415 requested = 1000 * mode->clock;
416 actual = kms->funcs->round_pixclk(kms,
417 requested, hdmi_connector->hdmi->encoder);
418
419 /* for mdp5/apq8074, we manage our own pixel clk (as opposed to
420 * mdp4/dtv stuff where pixel clk is assigned to mdp/encoder
421 * instead):
422 */
423 if (config->pwr_clk_cnt > 0)
424 actual = clk_round_rate(hdmi->pwr_clks[0], actual);
425
426 DBG("requested=%ld, actual=%ld", requested, actual);
427
428 if (actual != requested)
429 return MODE_CLOCK_RANGE;
430
431 return 0;
432}
433
434static const struct drm_connector_funcs hdmi_connector_funcs = {
435 .detect = hdmi_connector_detect,
436 .fill_modes = drm_helper_probe_single_connector_modes,
437 .destroy = hdmi_connector_destroy,
438 .reset = drm_atomic_helper_connector_reset,
439 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
440 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
441};
442
443static const struct drm_connector_helper_funcs msm_hdmi_connector_helper_funcs = {
444 .get_modes = msm_hdmi_connector_get_modes,
445 .mode_valid = msm_hdmi_connector_mode_valid,
446};
447
448/* initialize connector */
449struct drm_connector *msm_hdmi_connector_init(struct hdmi *hdmi)
450{
451 struct drm_connector *connector = NULL;
452 struct hdmi_connector *hdmi_connector;
453 int ret;
454
455 hdmi_connector = kzalloc(sizeof(*hdmi_connector), GFP_KERNEL);
456 if (!hdmi_connector)
457 return ERR_PTR(-ENOMEM);
458
459 hdmi_connector->hdmi = hdmi;
460 INIT_WORK(&hdmi_connector->hpd_work, msm_hdmi_hotplug_work);
461
462 connector = &hdmi_connector->base;
463
464 drm_connector_init(hdmi->dev, connector, &hdmi_connector_funcs,
465 DRM_MODE_CONNECTOR_HDMIA);
466 drm_connector_helper_add(connector, &msm_hdmi_connector_helper_funcs);
467
468 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
469 DRM_CONNECTOR_POLL_DISCONNECT;
470
471 connector->interlace_allowed = 0;
472 connector->doublescan_allowed = 0;
473
474 ret = hpd_enable(hdmi_connector);
475 if (ret) {
476 dev_err(&hdmi->pdev->dev, "failed to enable HPD: %d\n", ret);
477 return ERR_PTR(ret);
478 }
479
480 drm_mode_connector_attach_encoder(connector, hdmi->encoder);
481
482 return connector;
483}