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_SEL", 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);
83 gpio_free(config->ddc_clk_gpio);
84 gpio_free(config->ddc_data_gpio);
85 gpio_free(config->hpd_gpio);
87 if (config->mux_en_gpio != -1) {
88 gpio_set_value_cansleep(config->mux_en_gpio, 0);
89 gpio_free(config->mux_en_gpio);
92 if (config->mux_sel_gpio != -1) {
93 gpio_set_value_cansleep(config->mux_sel_gpio, 1);
94 gpio_free(config->mux_sel_gpio);
102 if (config->mux_en_gpio != -1)
103 gpio_free(config->mux_en_gpio);
105 gpio_free(config->hpd_gpio);
107 gpio_free(config->ddc_data_gpio);
109 gpio_free(config->ddc_clk_gpio);
114 static int hpd_enable(struct hdmi_connector *hdmi_connector)
116 struct hdmi *hdmi = hdmi_connector->hdmi;
117 const struct hdmi_platform_config *config = hdmi->config;
118 struct drm_device *dev = hdmi_connector->base.dev;
119 struct hdmi_phy *phy = hdmi->phy;
123 ret = gpio_config(hdmi, true);
125 dev_err(dev->dev, "failed to configure GPIOs: %d\n", ret);
129 for (i = 0; i < config->hpd_clk_cnt; i++) {
130 ret = clk_prepare_enable(hdmi->hpd_clks[i]);
132 dev_err(dev->dev, "failed to enable hpd clk: %s (%d)\n",
133 config->hpd_clk_names[i], ret);
138 for (i = 0; i < config->hpd_reg_cnt; i++) {
139 ret = regulator_enable(hdmi->hpd_regs[i]);
141 dev_err(dev->dev, "failed to enable hpd regulator: %s (%d)\n",
142 config->hpd_reg_names[i], ret);
147 hdmi_set_mode(hdmi, false);
148 phy->funcs->reset(phy);
149 hdmi_set_mode(hdmi, true);
151 hdmi_write(hdmi, REG_HDMI_USEC_REFTIMER, 0x0001001b);
153 /* enable HPD events: */
154 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
155 HDMI_HPD_INT_CTRL_INT_CONNECT |
156 HDMI_HPD_INT_CTRL_INT_EN);
158 /* set timeout to 4.1ms (max) for hardware debounce */
159 hpd_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
160 hpd_ctrl |= HDMI_HPD_CTRL_TIMEOUT(0x1fff);
162 /* Toggle HPD circuit to trigger HPD sense */
163 hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
164 ~HDMI_HPD_CTRL_ENABLE & hpd_ctrl);
165 hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
166 HDMI_HPD_CTRL_ENABLE | hpd_ctrl);
174 static int hdp_disable(struct hdmi_connector *hdmi_connector)
176 struct hdmi *hdmi = hdmi_connector->hdmi;
177 const struct hdmi_platform_config *config = hdmi->config;
178 struct drm_device *dev = hdmi_connector->base.dev;
181 /* Disable HPD interrupt */
182 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, 0);
184 hdmi_set_mode(hdmi, false);
186 for (i = 0; i < config->hpd_reg_cnt; i++) {
187 ret = regulator_disable(hdmi->hpd_regs[i]);
189 dev_err(dev->dev, "failed to disable hpd regulator: %s (%d)\n",
190 config->hpd_reg_names[i], ret);
195 for (i = 0; i < config->hpd_clk_cnt; i++)
196 clk_disable_unprepare(hdmi->hpd_clks[i]);
198 ret = gpio_config(hdmi, false);
200 dev_err(dev->dev, "failed to unconfigure GPIOs: %d\n", ret);
211 hotplug_work(struct work_struct *work)
213 struct hdmi_connector *hdmi_connector =
214 container_of(work, struct hdmi_connector, hpd_work);
215 struct drm_connector *connector = &hdmi_connector->base;
216 drm_helper_hpd_irq_event(connector->dev);
219 void hdmi_connector_irq(struct drm_connector *connector)
221 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
222 struct msm_drm_private *priv = connector->dev->dev_private;
223 struct hdmi *hdmi = hdmi_connector->hdmi;
224 uint32_t hpd_int_status, hpd_int_ctrl;
227 hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
228 hpd_int_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_INT_CTRL);
230 if ((hpd_int_ctrl & HDMI_HPD_INT_CTRL_INT_EN) &&
231 (hpd_int_status & HDMI_HPD_INT_STATUS_INT)) {
232 bool detected = !!(hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED);
234 DBG("status=%04x, ctrl=%04x", hpd_int_status, hpd_int_ctrl);
237 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
238 hpd_int_ctrl | HDMI_HPD_INT_CTRL_INT_ACK);
240 /* detect disconnect if we are connected or visa versa: */
241 hpd_int_ctrl = HDMI_HPD_INT_CTRL_INT_EN;
243 hpd_int_ctrl |= HDMI_HPD_INT_CTRL_INT_CONNECT;
244 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, hpd_int_ctrl);
246 queue_work(priv->wq, &hdmi_connector->hpd_work);
250 static enum drm_connector_status detect_reg(struct hdmi *hdmi)
252 uint32_t hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
253 return (hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED) ?
254 connector_status_connected : connector_status_disconnected;
257 static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
259 const struct hdmi_platform_config *config = hdmi->config;
260 return gpio_get_value(config->hpd_gpio) ?
261 connector_status_connected :
262 connector_status_disconnected;
265 static enum drm_connector_status hdmi_connector_detect(
266 struct drm_connector *connector, bool force)
268 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
269 struct hdmi *hdmi = hdmi_connector->hdmi;
270 enum drm_connector_status stat_gpio, stat_reg;
274 stat_gpio = detect_gpio(hdmi);
275 stat_reg = detect_reg(hdmi);
277 if (stat_gpio == stat_reg)
283 /* the status we get from reading gpio seems to be more reliable,
284 * so trust that one the most if we didn't manage to get hdmi and
285 * gpio status to agree:
287 if (stat_gpio != stat_reg) {
288 DBG("HDMI_HPD_INT_STATUS tells us: %d", stat_reg);
289 DBG("hpd gpio tells us: %d", stat_gpio);
295 static void hdmi_connector_destroy(struct drm_connector *connector)
297 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
299 hdp_disable(hdmi_connector);
301 drm_sysfs_connector_remove(connector);
302 drm_connector_cleanup(connector);
304 hdmi_unreference(hdmi_connector->hdmi);
306 kfree(hdmi_connector);
309 static int hdmi_connector_get_modes(struct drm_connector *connector)
311 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
312 struct hdmi *hdmi = hdmi_connector->hdmi;
317 hdmi_ctrl = hdmi_read(hdmi, REG_HDMI_CTRL);
318 hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl | HDMI_CTRL_ENABLE);
320 edid = drm_get_edid(connector, hdmi->i2c);
322 hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl);
324 drm_mode_connector_update_edid_property(connector, edid);
327 ret = drm_add_edid_modes(connector, edid);
334 static int hdmi_connector_mode_valid(struct drm_connector *connector,
335 struct drm_display_mode *mode)
337 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
338 struct hdmi *hdmi = hdmi_connector->hdmi;
339 const struct hdmi_platform_config *config = hdmi->config;
340 struct msm_drm_private *priv = connector->dev->dev_private;
341 struct msm_kms *kms = priv->kms;
342 long actual, requested;
344 requested = 1000 * mode->clock;
345 actual = kms->funcs->round_pixclk(kms,
346 requested, hdmi_connector->hdmi->encoder);
348 /* for mdp5/apq8074, we manage our own pixel clk (as opposed to
349 * mdp4/dtv stuff where pixel clk is assigned to mdp/encoder
352 if (config->pwr_clk_cnt > 0)
353 actual = clk_round_rate(hdmi->pwr_clks[0], actual);
355 DBG("requested=%ld, actual=%ld", requested, actual);
357 if (actual != requested)
358 return MODE_CLOCK_RANGE;
363 static struct drm_encoder *
364 hdmi_connector_best_encoder(struct drm_connector *connector)
366 struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
367 return hdmi_connector->hdmi->encoder;
370 static const struct drm_connector_funcs hdmi_connector_funcs = {
371 .dpms = drm_helper_connector_dpms,
372 .detect = hdmi_connector_detect,
373 .fill_modes = drm_helper_probe_single_connector_modes,
374 .destroy = hdmi_connector_destroy,
377 static const struct drm_connector_helper_funcs hdmi_connector_helper_funcs = {
378 .get_modes = hdmi_connector_get_modes,
379 .mode_valid = hdmi_connector_mode_valid,
380 .best_encoder = hdmi_connector_best_encoder,
383 /* initialize connector */
384 struct drm_connector *hdmi_connector_init(struct hdmi *hdmi)
386 struct drm_connector *connector = NULL;
387 struct hdmi_connector *hdmi_connector;
390 hdmi_connector = kzalloc(sizeof(*hdmi_connector), GFP_KERNEL);
391 if (!hdmi_connector) {
396 hdmi_connector->hdmi = hdmi_reference(hdmi);
397 INIT_WORK(&hdmi_connector->hpd_work, hotplug_work);
399 connector = &hdmi_connector->base;
401 drm_connector_init(hdmi->dev, connector, &hdmi_connector_funcs,
402 DRM_MODE_CONNECTOR_HDMIA);
403 drm_connector_helper_add(connector, &hdmi_connector_helper_funcs);
405 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
406 DRM_CONNECTOR_POLL_DISCONNECT;
408 connector->interlace_allowed = 1;
409 connector->doublescan_allowed = 0;
411 drm_sysfs_connector_add(connector);
413 ret = hpd_enable(hdmi_connector);
415 dev_err(hdmi->dev->dev, "failed to enable HPD: %d\n", ret);
419 drm_mode_connector_attach_encoder(connector, hdmi->encoder);
425 hdmi_connector_destroy(connector);