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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2013 Red Hat
4 * Author: Rob Clark <robdclark@gmail.com>
5 */
6
7#include <linux/delay.h>
8#include <linux/gpio/consumer.h>
9#include <linux/pinctrl/consumer.h>
10
11#include "msm_kms.h"
12#include "hdmi.h"
13
14struct hdmi_connector {
15 struct drm_connector base;
16 struct hdmi *hdmi;
17 struct work_struct hpd_work;
18};
19#define to_hdmi_connector(x) container_of(x, struct hdmi_connector, base)
20
21static void msm_hdmi_phy_reset(struct hdmi *hdmi)
22{
23 unsigned int val;
24
25 val = hdmi_read(hdmi, REG_HDMI_PHY_CTRL);
26
27 if (val & HDMI_PHY_CTRL_SW_RESET_LOW) {
28 /* pull low */
29 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
30 val & ~HDMI_PHY_CTRL_SW_RESET);
31 } else {
32 /* pull high */
33 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
34 val | HDMI_PHY_CTRL_SW_RESET);
35 }
36
37 if (val & HDMI_PHY_CTRL_SW_RESET_PLL_LOW) {
38 /* pull low */
39 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
40 val & ~HDMI_PHY_CTRL_SW_RESET_PLL);
41 } else {
42 /* pull high */
43 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
44 val | HDMI_PHY_CTRL_SW_RESET_PLL);
45 }
46
47 msleep(100);
48
49 if (val & HDMI_PHY_CTRL_SW_RESET_LOW) {
50 /* pull high */
51 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
52 val | HDMI_PHY_CTRL_SW_RESET);
53 } else {
54 /* pull low */
55 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
56 val & ~HDMI_PHY_CTRL_SW_RESET);
57 }
58
59 if (val & HDMI_PHY_CTRL_SW_RESET_PLL_LOW) {
60 /* pull high */
61 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
62 val | HDMI_PHY_CTRL_SW_RESET_PLL);
63 } else {
64 /* pull low */
65 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
66 val & ~HDMI_PHY_CTRL_SW_RESET_PLL);
67 }
68}
69
70static int gpio_config(struct hdmi *hdmi, bool on)
71{
72 const struct hdmi_platform_config *config = hdmi->config;
73 int i;
74
75 if (on) {
76 for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
77 struct hdmi_gpio_data gpio = config->gpios[i];
78
79 if (gpio.gpiod) {
80 if (gpio.output) {
81 gpiod_direction_output(gpio.gpiod,
82 gpio.value);
83 } else {
84 gpiod_direction_input(gpio.gpiod);
85 gpiod_set_value_cansleep(gpio.gpiod,
86 gpio.value);
87 }
88 }
89 }
90
91 DBG("gpio on");
92 } else {
93 for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
94 struct hdmi_gpio_data gpio = config->gpios[i];
95
96 if (!gpio.gpiod)
97 continue;
98
99 if (gpio.output) {
100 int value = gpio.value ? 0 : 1;
101
102 gpiod_set_value_cansleep(gpio.gpiod, value);
103 }
104 };
105
106 DBG("gpio off");
107 }
108
109 return 0;
110}
111
112static void enable_hpd_clocks(struct hdmi *hdmi, bool enable)
113{
114 const struct hdmi_platform_config *config = hdmi->config;
115 struct device *dev = &hdmi->pdev->dev;
116 int i, ret;
117
118 if (enable) {
119 for (i = 0; i < config->hpd_clk_cnt; i++) {
120 if (config->hpd_freq && config->hpd_freq[i]) {
121 ret = clk_set_rate(hdmi->hpd_clks[i],
122 config->hpd_freq[i]);
123 if (ret)
124 dev_warn(dev,
125 "failed to set clk %s (%d)\n",
126 config->hpd_clk_names[i], ret);
127 }
128
129 ret = clk_prepare_enable(hdmi->hpd_clks[i]);
130 if (ret) {
131 DRM_DEV_ERROR(dev,
132 "failed to enable hpd clk: %s (%d)\n",
133 config->hpd_clk_names[i], ret);
134 }
135 }
136 } else {
137 for (i = config->hpd_clk_cnt - 1; i >= 0; i--)
138 clk_disable_unprepare(hdmi->hpd_clks[i]);
139 }
140}
141
142int msm_hdmi_hpd_enable(struct drm_connector *connector)
143{
144 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
145 struct hdmi *hdmi = hdmi_connector->hdmi;
146 const struct hdmi_platform_config *config = hdmi->config;
147 struct device *dev = &hdmi->pdev->dev;
148 uint32_t hpd_ctrl;
149 int i, ret;
150 unsigned long flags;
151
152 for (i = 0; i < config->hpd_reg_cnt; i++) {
153 ret = regulator_enable(hdmi->hpd_regs[i]);
154 if (ret) {
155 DRM_DEV_ERROR(dev, "failed to enable hpd regulator: %s (%d)\n",
156 config->hpd_reg_names[i], ret);
157 goto fail;
158 }
159 }
160
161 ret = pinctrl_pm_select_default_state(dev);
162 if (ret) {
163 DRM_DEV_ERROR(dev, "pinctrl state chg failed: %d\n", ret);
164 goto fail;
165 }
166
167 ret = gpio_config(hdmi, true);
168 if (ret) {
169 DRM_DEV_ERROR(dev, "failed to configure GPIOs: %d\n", ret);
170 goto fail;
171 }
172
173 pm_runtime_get_sync(dev);
174 enable_hpd_clocks(hdmi, true);
175
176 msm_hdmi_set_mode(hdmi, false);
177 msm_hdmi_phy_reset(hdmi);
178 msm_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 spin_lock_irqsave(&hdmi->reg_lock, flags);
189 hpd_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
190 hpd_ctrl |= HDMI_HPD_CTRL_TIMEOUT(0x1fff);
191
192 /* Toggle HPD circuit to trigger HPD sense */
193 hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
194 ~HDMI_HPD_CTRL_ENABLE & hpd_ctrl);
195 hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
196 HDMI_HPD_CTRL_ENABLE | hpd_ctrl);
197 spin_unlock_irqrestore(&hdmi->reg_lock, flags);
198
199 return 0;
200
201fail:
202 return ret;
203}
204
205static void hdp_disable(struct hdmi_connector *hdmi_connector)
206{
207 struct hdmi *hdmi = hdmi_connector->hdmi;
208 const struct hdmi_platform_config *config = hdmi->config;
209 struct device *dev = &hdmi->pdev->dev;
210 int i, ret = 0;
211
212 /* Disable HPD interrupt */
213 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, 0);
214
215 msm_hdmi_set_mode(hdmi, false);
216
217 enable_hpd_clocks(hdmi, false);
218 pm_runtime_put_autosuspend(dev);
219
220 ret = gpio_config(hdmi, false);
221 if (ret)
222 dev_warn(dev, "failed to unconfigure GPIOs: %d\n", ret);
223
224 ret = pinctrl_pm_select_sleep_state(dev);
225 if (ret)
226 dev_warn(dev, "pinctrl state chg failed: %d\n", ret);
227
228 for (i = 0; i < config->hpd_reg_cnt; i++) {
229 ret = regulator_disable(hdmi->hpd_regs[i]);
230 if (ret)
231 dev_warn(dev, "failed to disable hpd regulator: %s (%d)\n",
232 config->hpd_reg_names[i], ret);
233 }
234}
235
236static void
237msm_hdmi_hotplug_work(struct work_struct *work)
238{
239 struct hdmi_connector *hdmi_connector =
240 container_of(work, struct hdmi_connector, hpd_work);
241 struct drm_connector *connector = &hdmi_connector->base;
242 drm_helper_hpd_irq_event(connector->dev);
243}
244
245void msm_hdmi_connector_irq(struct drm_connector *connector)
246{
247 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
248 struct hdmi *hdmi = hdmi_connector->hdmi;
249 uint32_t hpd_int_status, hpd_int_ctrl;
250
251 /* Process HPD: */
252 hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
253 hpd_int_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_INT_CTRL);
254
255 if ((hpd_int_ctrl & HDMI_HPD_INT_CTRL_INT_EN) &&
256 (hpd_int_status & HDMI_HPD_INT_STATUS_INT)) {
257 bool detected = !!(hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED);
258
259 /* ack & disable (temporarily) HPD events: */
260 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
261 HDMI_HPD_INT_CTRL_INT_ACK);
262
263 DBG("status=%04x, ctrl=%04x", hpd_int_status, hpd_int_ctrl);
264
265 /* detect disconnect if we are connected or visa versa: */
266 hpd_int_ctrl = HDMI_HPD_INT_CTRL_INT_EN;
267 if (!detected)
268 hpd_int_ctrl |= HDMI_HPD_INT_CTRL_INT_CONNECT;
269 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, hpd_int_ctrl);
270
271 queue_work(hdmi->workq, &hdmi_connector->hpd_work);
272 }
273}
274
275static enum drm_connector_status detect_reg(struct hdmi *hdmi)
276{
277 uint32_t hpd_int_status;
278
279 pm_runtime_get_sync(&hdmi->pdev->dev);
280 enable_hpd_clocks(hdmi, true);
281
282 hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
283
284 enable_hpd_clocks(hdmi, false);
285 pm_runtime_put_autosuspend(&hdmi->pdev->dev);
286
287 return (hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED) ?
288 connector_status_connected : connector_status_disconnected;
289}
290
291#define HPD_GPIO_INDEX 2
292static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
293{
294 const struct hdmi_platform_config *config = hdmi->config;
295 struct hdmi_gpio_data hpd_gpio = config->gpios[HPD_GPIO_INDEX];
296
297 return gpiod_get_value(hpd_gpio.gpiod) ?
298 connector_status_connected :
299 connector_status_disconnected;
300}
301
302static enum drm_connector_status hdmi_connector_detect(
303 struct drm_connector *connector, bool force)
304{
305 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
306 struct hdmi *hdmi = hdmi_connector->hdmi;
307 const struct hdmi_platform_config *config = hdmi->config;
308 struct hdmi_gpio_data hpd_gpio = config->gpios[HPD_GPIO_INDEX];
309 enum drm_connector_status stat_gpio, stat_reg;
310 int retry = 20;
311
312 /*
313 * some platforms may not have hpd gpio. Rely only on the status
314 * provided by REG_HDMI_HPD_INT_STATUS in this case.
315 */
316 if (!hpd_gpio.gpiod)
317 return detect_reg(hdmi);
318
319 do {
320 stat_gpio = detect_gpio(hdmi);
321 stat_reg = detect_reg(hdmi);
322
323 if (stat_gpio == stat_reg)
324 break;
325
326 mdelay(10);
327 } while (--retry);
328
329 /* the status we get from reading gpio seems to be more reliable,
330 * so trust that one the most if we didn't manage to get hdmi and
331 * gpio status to agree:
332 */
333 if (stat_gpio != stat_reg) {
334 DBG("HDMI_HPD_INT_STATUS tells us: %d", stat_reg);
335 DBG("hpd gpio tells us: %d", stat_gpio);
336 }
337
338 return stat_gpio;
339}
340
341static void hdmi_connector_destroy(struct drm_connector *connector)
342{
343 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
344
345 hdp_disable(hdmi_connector);
346
347 drm_connector_cleanup(connector);
348
349 kfree(hdmi_connector);
350}
351
352static int msm_hdmi_connector_get_modes(struct drm_connector *connector)
353{
354 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
355 struct hdmi *hdmi = hdmi_connector->hdmi;
356 struct edid *edid;
357 uint32_t hdmi_ctrl;
358 int ret = 0;
359
360 hdmi_ctrl = hdmi_read(hdmi, REG_HDMI_CTRL);
361 hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl | HDMI_CTRL_ENABLE);
362
363 edid = drm_get_edid(connector, hdmi->i2c);
364
365 hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl);
366
367 hdmi->hdmi_mode = drm_detect_hdmi_monitor(edid);
368 drm_connector_update_edid_property(connector, edid);
369
370 if (edid) {
371 ret = drm_add_edid_modes(connector, edid);
372 kfree(edid);
373 }
374
375 return ret;
376}
377
378static int msm_hdmi_connector_mode_valid(struct drm_connector *connector,
379 struct drm_display_mode *mode)
380{
381 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
382 struct hdmi *hdmi = hdmi_connector->hdmi;
383 const struct hdmi_platform_config *config = hdmi->config;
384 struct msm_drm_private *priv = connector->dev->dev_private;
385 struct msm_kms *kms = priv->kms;
386 long actual, requested;
387
388 requested = 1000 * mode->clock;
389 actual = kms->funcs->round_pixclk(kms,
390 requested, hdmi_connector->hdmi->encoder);
391
392 /* for mdp5/apq8074, we manage our own pixel clk (as opposed to
393 * mdp4/dtv stuff where pixel clk is assigned to mdp/encoder
394 * instead):
395 */
396 if (config->pwr_clk_cnt > 0)
397 actual = clk_round_rate(hdmi->pwr_clks[0], actual);
398
399 DBG("requested=%ld, actual=%ld", requested, actual);
400
401 if (actual != requested)
402 return MODE_CLOCK_RANGE;
403
404 return 0;
405}
406
407static const struct drm_connector_funcs hdmi_connector_funcs = {
408 .detect = hdmi_connector_detect,
409 .fill_modes = drm_helper_probe_single_connector_modes,
410 .destroy = hdmi_connector_destroy,
411 .reset = drm_atomic_helper_connector_reset,
412 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
413 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
414};
415
416static const struct drm_connector_helper_funcs msm_hdmi_connector_helper_funcs = {
417 .get_modes = msm_hdmi_connector_get_modes,
418 .mode_valid = msm_hdmi_connector_mode_valid,
419};
420
421/* initialize connector */
422struct drm_connector *msm_hdmi_connector_init(struct hdmi *hdmi)
423{
424 struct drm_connector *connector = NULL;
425 struct hdmi_connector *hdmi_connector;
426
427 hdmi_connector = kzalloc(sizeof(*hdmi_connector), GFP_KERNEL);
428 if (!hdmi_connector)
429 return ERR_PTR(-ENOMEM);
430
431 hdmi_connector->hdmi = hdmi;
432 INIT_WORK(&hdmi_connector->hpd_work, msm_hdmi_hotplug_work);
433
434 connector = &hdmi_connector->base;
435
436 drm_connector_init(hdmi->dev, connector, &hdmi_connector_funcs,
437 DRM_MODE_CONNECTOR_HDMIA);
438 drm_connector_helper_add(connector, &msm_hdmi_connector_helper_funcs);
439
440 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
441 DRM_CONNECTOR_POLL_DISCONNECT;
442
443 connector->interlace_allowed = 0;
444 connector->doublescan_allowed = 0;
445
446 drm_connector_attach_encoder(connector, hdmi->encoder);
447
448 return connector;
449}