2 * Copyright (C) 2013 Red Hat
3 * Author: Rob Clark <robdclark@gmail.com>
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.
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
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/>.
18 #include <linux/gpio.h>
23 struct hdmi_connector {
24 struct drm_connector base;
26 struct work_struct hpd_work;
28 #define to_hdmi_connector(x) container_of(x, struct hdmi_connector, base)
30 static int gpio_config(struct hdmi *hdmi, bool on)
32 struct drm_device *dev = hdmi->dev;
33 const struct hdmi_platform_config *config = hdmi->config;
37 ret = gpio_request(config->ddc_clk_gpio, "HDMI_DDC_CLK");
39 dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
40 "HDMI_DDC_CLK", config->ddc_clk_gpio, ret);
43 gpio_set_value_cansleep(config->ddc_clk_gpio, 1);
45 ret = gpio_request(config->ddc_data_gpio, "HDMI_DDC_DATA");
47 dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
48 "HDMI_DDC_DATA", config->ddc_data_gpio, ret);
51 gpio_set_value_cansleep(config->ddc_data_gpio, 1);
53 ret = gpio_request(config->hpd_gpio, "HDMI_HPD");
55 dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
56 "HDMI_HPD", config->hpd_gpio, ret);
59 gpio_direction_input(config->hpd_gpio);
60 gpio_set_value_cansleep(config->hpd_gpio, 1);
62 if (config->mux_en_gpio != -1) {
63 ret = gpio_request(config->mux_en_gpio, "HDMI_MUX_EN");
65 dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
66 "HDMI_MUX_EN", config->mux_en_gpio, ret);
69 gpio_set_value_cansleep(config->mux_en_gpio, 1);
72 if (config->mux_sel_gpio != -1) {
73 ret = gpio_request(config->mux_sel_gpio, "HDMI_MUX_SEL");
75 dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
76 "HDMI_MUX_SEL", config->mux_sel_gpio, ret);
79 gpio_set_value_cansleep(config->mux_sel_gpio, 0);
82 if (config->mux_lpm_gpio != -1) {
83 ret = gpio_request(config->mux_lpm_gpio,
87 "'%s'(%d) gpio_request failed: %d\n",
89 config->mux_lpm_gpio, ret);
92 gpio_set_value_cansleep(config->mux_lpm_gpio, 1);
96 gpio_free(config->ddc_clk_gpio);
97 gpio_free(config->ddc_data_gpio);
98 gpio_free(config->hpd_gpio);
100 if (config->mux_en_gpio != -1) {
101 gpio_set_value_cansleep(config->mux_en_gpio, 0);
102 gpio_free(config->mux_en_gpio);
105 if (config->mux_sel_gpio != -1) {
106 gpio_set_value_cansleep(config->mux_sel_gpio, 1);
107 gpio_free(config->mux_sel_gpio);
110 if (config->mux_lpm_gpio != -1) {
111 gpio_set_value_cansleep(config->mux_lpm_gpio, 0);
112 gpio_free(config->mux_lpm_gpio);
120 if (config->mux_sel_gpio != -1)
121 gpio_free(config->mux_sel_gpio);
123 if (config->mux_en_gpio != -1)
124 gpio_free(config->mux_en_gpio);
126 gpio_free(config->hpd_gpio);
128 gpio_free(config->ddc_data_gpio);
130 gpio_free(config->ddc_clk_gpio);
135 static int hpd_enable(struct hdmi_connector *hdmi_connector)
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;
144 ret = gpio_config(hdmi, true);
146 dev_err(dev->dev, "failed to configure GPIOs: %d\n", ret);
150 for (i = 0; i < config->hpd_clk_cnt; i++) {
151 if (config->hpd_freq && config->hpd_freq[i]) {
152 ret = clk_set_rate(hdmi->hpd_clks[i],
153 config->hpd_freq[i]);
155 dev_warn(dev->dev, "failed to set clk %s (%d)\n",
156 config->hpd_clk_names[i], ret);
159 ret = clk_prepare_enable(hdmi->hpd_clks[i]);
161 dev_err(dev->dev, "failed to enable hpd clk: %s (%d)\n",
162 config->hpd_clk_names[i], ret);
167 for (i = 0; i < config->hpd_reg_cnt; i++) {
168 ret = regulator_enable(hdmi->hpd_regs[i]);
170 dev_err(dev->dev, "failed to enable hpd regulator: %s (%d)\n",
171 config->hpd_reg_names[i], ret);
176 hdmi_set_mode(hdmi, false);
177 phy->funcs->reset(phy);
178 hdmi_set_mode(hdmi, true);
180 hdmi_write(hdmi, REG_HDMI_USEC_REFTIMER, 0x0001001b);
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);
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);
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);
203 static int hdp_disable(struct hdmi_connector *hdmi_connector)
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;
210 /* Disable HPD interrupt */
211 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, 0);
213 hdmi_set_mode(hdmi, false);
215 for (i = 0; i < config->hpd_reg_cnt; i++) {
216 ret = regulator_disable(hdmi->hpd_regs[i]);
218 dev_err(dev->dev, "failed to disable hpd regulator: %s (%d)\n",
219 config->hpd_reg_names[i], ret);
224 for (i = 0; i < config->hpd_clk_cnt; i++)
225 clk_disable_unprepare(hdmi->hpd_clks[i]);
227 ret = gpio_config(hdmi, false);
229 dev_err(dev->dev, "failed to unconfigure GPIOs: %d\n", ret);
240 hotplug_work(struct work_struct *work)
242 struct hdmi_connector *hdmi_connector =
243 container_of(work, struct hdmi_connector, hpd_work);
244 struct drm_connector *connector = &hdmi_connector->base;
245 drm_helper_hpd_irq_event(connector->dev);
248 void hdmi_connector_irq(struct drm_connector *connector)
250 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
251 struct msm_drm_private *priv = connector->dev->dev_private;
252 struct hdmi *hdmi = hdmi_connector->hdmi;
253 uint32_t hpd_int_status, hpd_int_ctrl;
256 hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
257 hpd_int_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_INT_CTRL);
259 if ((hpd_int_ctrl & HDMI_HPD_INT_CTRL_INT_EN) &&
260 (hpd_int_status & HDMI_HPD_INT_STATUS_INT)) {
261 bool detected = !!(hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED);
263 DBG("status=%04x, ctrl=%04x", hpd_int_status, hpd_int_ctrl);
266 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
267 hpd_int_ctrl | HDMI_HPD_INT_CTRL_INT_ACK);
269 /* detect disconnect if we are connected or visa versa: */
270 hpd_int_ctrl = HDMI_HPD_INT_CTRL_INT_EN;
272 hpd_int_ctrl |= HDMI_HPD_INT_CTRL_INT_CONNECT;
273 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, hpd_int_ctrl);
275 queue_work(priv->wq, &hdmi_connector->hpd_work);
279 static enum drm_connector_status detect_reg(struct hdmi *hdmi)
281 uint32_t hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
282 return (hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED) ?
283 connector_status_connected : connector_status_disconnected;
286 static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
288 const struct hdmi_platform_config *config = hdmi->config;
289 return gpio_get_value(config->hpd_gpio) ?
290 connector_status_connected :
291 connector_status_disconnected;
294 static enum drm_connector_status hdmi_connector_detect(
295 struct drm_connector *connector, bool force)
297 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
298 struct hdmi *hdmi = hdmi_connector->hdmi;
299 enum drm_connector_status stat_gpio, stat_reg;
303 stat_gpio = detect_gpio(hdmi);
304 stat_reg = detect_reg(hdmi);
306 if (stat_gpio == stat_reg)
312 /* the status we get from reading gpio seems to be more reliable,
313 * so trust that one the most if we didn't manage to get hdmi and
314 * gpio status to agree:
316 if (stat_gpio != stat_reg) {
317 DBG("HDMI_HPD_INT_STATUS tells us: %d", stat_reg);
318 DBG("hpd gpio tells us: %d", stat_gpio);
324 static void hdmi_connector_destroy(struct drm_connector *connector)
326 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
328 hdp_disable(hdmi_connector);
330 drm_connector_unregister(connector);
331 drm_connector_cleanup(connector);
333 kfree(hdmi_connector);
336 static int hdmi_connector_get_modes(struct drm_connector *connector)
338 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
339 struct hdmi *hdmi = hdmi_connector->hdmi;
344 hdmi_ctrl = hdmi_read(hdmi, REG_HDMI_CTRL);
345 hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl | HDMI_CTRL_ENABLE);
347 edid = drm_get_edid(connector, hdmi->i2c);
349 hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl);
351 drm_mode_connector_update_edid_property(connector, edid);
354 ret = drm_add_edid_modes(connector, edid);
361 static int hdmi_connector_mode_valid(struct drm_connector *connector,
362 struct drm_display_mode *mode)
364 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
365 struct hdmi *hdmi = hdmi_connector->hdmi;
366 const struct hdmi_platform_config *config = hdmi->config;
367 struct msm_drm_private *priv = connector->dev->dev_private;
368 struct msm_kms *kms = priv->kms;
369 long actual, requested;
371 requested = 1000 * mode->clock;
372 actual = kms->funcs->round_pixclk(kms,
373 requested, hdmi_connector->hdmi->encoder);
375 /* for mdp5/apq8074, we manage our own pixel clk (as opposed to
376 * mdp4/dtv stuff where pixel clk is assigned to mdp/encoder
379 if (config->pwr_clk_cnt > 0)
380 actual = clk_round_rate(hdmi->pwr_clks[0], actual);
382 DBG("requested=%ld, actual=%ld", requested, actual);
384 if (actual != requested)
385 return MODE_CLOCK_RANGE;
390 static struct drm_encoder *
391 hdmi_connector_best_encoder(struct drm_connector *connector)
393 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
394 return hdmi_connector->hdmi->encoder;
397 static const struct drm_connector_funcs hdmi_connector_funcs = {
398 .dpms = drm_helper_connector_dpms,
399 .detect = hdmi_connector_detect,
400 .fill_modes = drm_helper_probe_single_connector_modes,
401 .destroy = hdmi_connector_destroy,
402 .reset = drm_atomic_helper_connector_reset,
403 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
404 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
407 static const struct drm_connector_helper_funcs hdmi_connector_helper_funcs = {
408 .get_modes = hdmi_connector_get_modes,
409 .mode_valid = hdmi_connector_mode_valid,
410 .best_encoder = hdmi_connector_best_encoder,
413 /* initialize connector */
414 struct drm_connector *hdmi_connector_init(struct hdmi *hdmi)
416 struct drm_connector *connector = NULL;
417 struct hdmi_connector *hdmi_connector;
420 hdmi_connector = kzalloc(sizeof(*hdmi_connector), GFP_KERNEL);
421 if (!hdmi_connector) {
426 hdmi_connector->hdmi = hdmi;
427 INIT_WORK(&hdmi_connector->hpd_work, hotplug_work);
429 connector = &hdmi_connector->base;
431 drm_connector_init(hdmi->dev, connector, &hdmi_connector_funcs,
432 DRM_MODE_CONNECTOR_HDMIA);
433 drm_connector_helper_add(connector, &hdmi_connector_helper_funcs);
435 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
436 DRM_CONNECTOR_POLL_DISCONNECT;
438 connector->interlace_allowed = 1;
439 connector->doublescan_allowed = 0;
441 drm_connector_register(connector);
443 ret = hpd_enable(hdmi_connector);
445 dev_err(hdmi->dev->dev, "failed to enable HPD: %d\n", ret);
449 drm_mode_connector_attach_encoder(connector, hdmi->encoder);
455 hdmi_connector_destroy(connector);