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