[deliverable/linux.git] / drivers / gpu / drm / msm / hdmi / hdmi_connector.c

/*
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/gpio.h>

#include "msm_kms.h"
#include "hdmi.h"

struct hdmi_connector {
	struct drm_connector base;
	struct hdmi *hdmi;
	struct work_struct hpd_work;
};
#define to_hdmi_connector(x) container_of(x, struct hdmi_connector, base)

static int gpio_config(struct hdmi *hdmi, bool on)
{
	struct drm_device *dev = hdmi->dev;
	const struct hdmi_platform_config *config = hdmi->config;
	int ret;

	if (on) {
		ret = gpio_request(config->ddc_clk_gpio, "HDMI_DDC_CLK");
		if (ret) {
			dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
				"HDMI_DDC_CLK", config->ddc_clk_gpio, ret);
			goto error1;
		}
		gpio_set_value_cansleep(config->ddc_clk_gpio, 1);

		ret = gpio_request(config->ddc_data_gpio, "HDMI_DDC_DATA");
		if (ret) {
			dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
				"HDMI_DDC_DATA", config->ddc_data_gpio, ret);
			goto error2;
		}
		gpio_set_value_cansleep(config->ddc_data_gpio, 1);

		ret = gpio_request(config->hpd_gpio, "HDMI_HPD");
		if (ret) {
			dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
				"HDMI_HPD", config->hpd_gpio, ret);
			goto error3;
		}
		gpio_direction_input(config->hpd_gpio);
		gpio_set_value_cansleep(config->hpd_gpio, 1);

		if (config->mux_en_gpio != -1) {
			ret = gpio_request(config->mux_en_gpio, "HDMI_MUX_EN");
			if (ret) {
				dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
					"HDMI_MUX_EN", config->mux_en_gpio, ret);
				goto error4;
			}
			gpio_set_value_cansleep(config->mux_en_gpio, 1);
		}

		if (config->mux_sel_gpio != -1) {
			ret = gpio_request(config->mux_sel_gpio, "HDMI_MUX_SEL");
			if (ret) {
				dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
					"HDMI_MUX_SEL", config->mux_sel_gpio, ret);
				goto error5;
			}
			gpio_set_value_cansleep(config->mux_sel_gpio, 0);
		}

		if (config->mux_lpm_gpio != -1) {
			ret = gpio_request(config->mux_lpm_gpio,
					"HDMI_MUX_LPM");
			if (ret) {
				dev_err(dev->dev,
					"'%s'(%d) gpio_request failed: %d\n",
					"HDMI_MUX_LPM",
					config->mux_lpm_gpio, ret);
				goto error6;
			}
			gpio_set_value_cansleep(config->mux_lpm_gpio, 1);
		}
		DBG("gpio on");
	} else {
		gpio_free(config->ddc_clk_gpio);
		gpio_free(config->ddc_data_gpio);
		gpio_free(config->hpd_gpio);

		if (config->mux_en_gpio != -1) {
			gpio_set_value_cansleep(config->mux_en_gpio, 0);
			gpio_free(config->mux_en_gpio);
		}

		if (config->mux_sel_gpio != -1) {
			gpio_set_value_cansleep(config->mux_sel_gpio, 1);
			gpio_free(config->mux_sel_gpio);
		}

		if (config->mux_lpm_gpio != -1) {
			gpio_set_value_cansleep(config->mux_lpm_gpio, 0);
			gpio_free(config->mux_lpm_gpio);
		}
		DBG("gpio off");
	}

	return 0;

error6:
	if (config->mux_sel_gpio != -1)
		gpio_free(config->mux_sel_gpio);
error5:
	if (config->mux_en_gpio != -1)
		gpio_free(config->mux_en_gpio);
error4:
	gpio_free(config->hpd_gpio);
error3:
	gpio_free(config->ddc_data_gpio);
error2:
	gpio_free(config->ddc_clk_gpio);
error1:
	return ret;
}

static int hpd_enable(struct hdmi_connector *hdmi_connector)
{
	struct hdmi *hdmi = hdmi_connector->hdmi;
	const struct hdmi_platform_config *config = hdmi->config;
	struct drm_device *dev = hdmi_connector->base.dev;
	struct hdmi_phy *phy = hdmi->phy;
	uint32_t hpd_ctrl;
	int i, ret;

	for (i = 0; i < config->hpd_reg_cnt; i++) {
		ret = regulator_enable(hdmi->hpd_regs[i]);
		if (ret) {
			dev_err(dev->dev, "failed to enable hpd regulator: %s (%d)\n",
					config->hpd_reg_names[i], ret);
			goto fail;
		}
	}

	ret = gpio_config(hdmi, true);
	if (ret) {
		dev_err(dev->dev, "failed to configure GPIOs: %d\n", ret);
		goto fail;
	}

	for (i = 0; i < config->hpd_clk_cnt; i++) {
		if (config->hpd_freq && config->hpd_freq[i]) {
			ret = clk_set_rate(hdmi->hpd_clks[i],
					config->hpd_freq[i]);
			if (ret)
				dev_warn(dev->dev, "failed to set clk %s (%d)\n",
						config->hpd_clk_names[i], ret);
		}

		ret = clk_prepare_enable(hdmi->hpd_clks[i]);
		if (ret) {
			dev_err(dev->dev, "failed to enable hpd clk: %s (%d)\n",
					config->hpd_clk_names[i], ret);
			goto fail;
		}
	}

	hdmi_set_mode(hdmi, false);
	phy->funcs->reset(phy);
	hdmi_set_mode(hdmi, true);

	hdmi_write(hdmi, REG_HDMI_USEC_REFTIMER, 0x0001001b);

	/* enable HPD events: */
	hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
			HDMI_HPD_INT_CTRL_INT_CONNECT |
			HDMI_HPD_INT_CTRL_INT_EN);

	/* set timeout to 4.1ms (max) for hardware debounce */
	hpd_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
	hpd_ctrl |= HDMI_HPD_CTRL_TIMEOUT(0x1fff);

	/* Toggle HPD circuit to trigger HPD sense */
	hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
			~HDMI_HPD_CTRL_ENABLE & hpd_ctrl);
	hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
			HDMI_HPD_CTRL_ENABLE | hpd_ctrl);

	return 0;

fail:
	return ret;
}

static void hdp_disable(struct hdmi_connector *hdmi_connector)
{
	struct hdmi *hdmi = hdmi_connector->hdmi;
	const struct hdmi_platform_config *config = hdmi->config;
	struct drm_device *dev = hdmi_connector->base.dev;
	int i, ret = 0;

	/* Disable HPD interrupt */
	hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, 0);

	hdmi_set_mode(hdmi, false);

	for (i = 0; i < config->hpd_clk_cnt; i++)
		clk_disable_unprepare(hdmi->hpd_clks[i]);

	ret = gpio_config(hdmi, false);
	if (ret)
		dev_warn(dev->dev, "failed to unconfigure GPIOs: %d\n", ret);

	for (i = 0; i < config->hpd_reg_cnt; i++) {
		ret = regulator_disable(hdmi->hpd_regs[i]);
		if (ret)
			dev_warn(dev->dev, "failed to disable hpd regulator: %s (%d)\n",
					config->hpd_reg_names[i], ret);
	}
}

static void
hotplug_work(struct work_struct *work)
{
	struct hdmi_connector *hdmi_connector =
		container_of(work, struct hdmi_connector, hpd_work);
	struct drm_connector *connector = &hdmi_connector->base;
	drm_helper_hpd_irq_event(connector->dev);
}

void hdmi_connector_irq(struct drm_connector *connector)
{
	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
	struct msm_drm_private *priv = connector->dev->dev_private;
	struct hdmi *hdmi = hdmi_connector->hdmi;
	uint32_t hpd_int_status, hpd_int_ctrl;

	/* Process HPD: */
	hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
	hpd_int_ctrl   = hdmi_read(hdmi, REG_HDMI_HPD_INT_CTRL);

	if ((hpd_int_ctrl & HDMI_HPD_INT_CTRL_INT_EN) &&
			(hpd_int_status & HDMI_HPD_INT_STATUS_INT)) {
		bool detected = !!(hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED);

		/* ack & disable (temporarily) HPD events: */
		hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
			HDMI_HPD_INT_CTRL_INT_ACK);

		DBG("status=%04x, ctrl=%04x", hpd_int_status, hpd_int_ctrl);

		/* detect disconnect if we are connected or visa versa: */
		hpd_int_ctrl = HDMI_HPD_INT_CTRL_INT_EN;
		if (!detected)
			hpd_int_ctrl |= HDMI_HPD_INT_CTRL_INT_CONNECT;
		hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, hpd_int_ctrl);

		queue_work(priv->wq, &hdmi_connector->hpd_work);
	}
}

static enum drm_connector_status detect_reg(struct hdmi *hdmi)
{
	uint32_t hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
	return (hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED) ?
			connector_status_connected : connector_status_disconnected;
}

static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
{
	const struct hdmi_platform_config *config = hdmi->config;
	return gpio_get_value(config->hpd_gpio) ?
			connector_status_connected :
			connector_status_disconnected;
}

static enum drm_connector_status hdmi_connector_detect(
		struct drm_connector *connector, bool force)
{
	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
	struct hdmi *hdmi = hdmi_connector->hdmi;
	enum drm_connector_status stat_gpio, stat_reg;
	int retry = 20;

	do {
		stat_gpio = detect_gpio(hdmi);
		stat_reg  = detect_reg(hdmi);

		if (stat_gpio == stat_reg)
			break;

		mdelay(10);
	} while (--retry);

	/* the status we get from reading gpio seems to be more reliable,
	 * so trust that one the most if we didn't manage to get hdmi and
	 * gpio status to agree:
	 */
	if (stat_gpio != stat_reg) {
		DBG("HDMI_HPD_INT_STATUS tells us: %d", stat_reg);
		DBG("hpd gpio tells us: %d", stat_gpio);
	}

	return stat_gpio;
}

static void hdmi_connector_destroy(struct drm_connector *connector)
{
	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);

	hdp_disable(hdmi_connector);

	drm_connector_unregister(connector);
	drm_connector_cleanup(connector);

	kfree(hdmi_connector);
}

static int hdmi_connector_get_modes(struct drm_connector *connector)
{
	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
	struct hdmi *hdmi = hdmi_connector->hdmi;
	struct edid *edid;
	uint32_t hdmi_ctrl;
	int ret = 0;

	hdmi_ctrl = hdmi_read(hdmi, REG_HDMI_CTRL);
	hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl | HDMI_CTRL_ENABLE);

	edid = drm_get_edid(connector, hdmi->i2c);

	hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl);

	drm_mode_connector_update_edid_property(connector, edid);

	if (edid) {
		ret = drm_add_edid_modes(connector, edid);
		kfree(edid);
	}

	return ret;
}

static int hdmi_connector_mode_valid(struct drm_connector *connector,
				 struct drm_display_mode *mode)
{
	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
	struct hdmi *hdmi = hdmi_connector->hdmi;
	const struct hdmi_platform_config *config = hdmi->config;
	struct msm_drm_private *priv = connector->dev->dev_private;
	struct msm_kms *kms = priv->kms;
	long actual, requested;

	requested = 1000 * mode->clock;
	actual = kms->funcs->round_pixclk(kms,
			requested, hdmi_connector->hdmi->encoder);

	/* for mdp5/apq8074, we manage our own pixel clk (as opposed to
	 * mdp4/dtv stuff where pixel clk is assigned to mdp/encoder
	 * instead):
	 */
	if (config->pwr_clk_cnt > 0)
		actual = clk_round_rate(hdmi->pwr_clks[0], actual);

	DBG("requested=%ld, actual=%ld", requested, actual);

	if (actual != requested)
		return MODE_CLOCK_RANGE;

	return 0;
}

static struct drm_encoder *
hdmi_connector_best_encoder(struct drm_connector *connector)
{
	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
	return hdmi_connector->hdmi->encoder;
}

static const struct drm_connector_funcs hdmi_connector_funcs = {
	.dpms = drm_atomic_helper_connector_dpms,
	.detect = hdmi_connector_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = hdmi_connector_destroy,
	.reset = drm_atomic_helper_connector_reset,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static const struct drm_connector_helper_funcs hdmi_connector_helper_funcs = {
	.get_modes = hdmi_connector_get_modes,
	.mode_valid = hdmi_connector_mode_valid,
	.best_encoder = hdmi_connector_best_encoder,
};

/* initialize connector */
struct drm_connector *hdmi_connector_init(struct hdmi *hdmi)
{
	struct drm_connector *connector = NULL;
	struct hdmi_connector *hdmi_connector;
	int ret;

	hdmi_connector = kzalloc(sizeof(*hdmi_connector), GFP_KERNEL);
	if (!hdmi_connector) {
		ret = -ENOMEM;
		goto fail;
	}

	hdmi_connector->hdmi = hdmi;
	INIT_WORK(&hdmi_connector->hpd_work, hotplug_work);

	connector = &hdmi_connector->base;

	drm_connector_init(hdmi->dev, connector, &hdmi_connector_funcs,
			DRM_MODE_CONNECTOR_HDMIA);
	drm_connector_helper_add(connector, &hdmi_connector_helper_funcs);

	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
			DRM_CONNECTOR_POLL_DISCONNECT;

	connector->interlace_allowed = 0;
	connector->doublescan_allowed = 0;

	drm_connector_register(connector);

	ret = hpd_enable(hdmi_connector);
	if (ret) {
		dev_err(hdmi->dev->dev, "failed to enable HPD: %d\n", ret);
		goto fail;
	}

	drm_mode_connector_attach_encoder(connector, hdmi->encoder);

	return connector;

fail:
	if (connector)
		hdmi_connector_destroy(connector);

	return ERR_PTR(ret);
}
Commit	Line	Data
c8afe684 RC	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
dd2da6e3	20	#include "msm_kms.h"
c8afe684 RC	21	#include "hdmi.h"
	22
	23	struct hdmi_connector {
a3376e3e RC	24	struct drm_connector base;
a3376e3e RC	25	struct hdmi *hdmi;
dada25bd	26	struct work_struct hpd_work;
c8afe684 RC	27	};
	28	#define to_hdmi_connector(x) container_of(x, struct hdmi_connector, base)
	29
	30	static int gpio_config(struct hdmi *hdmi, bool on)
	31	{
	32	struct drm_device *dev = hdmi->dev;
dada25bd	33	const struct hdmi_platform_config *config = hdmi->config;
c8afe684 RC	34	int ret;
	35
	36	if (on) {
	37	ret = gpio_request(config->ddc_clk_gpio, "HDMI_DDC_CLK");
	38	if (ret) {
	39	dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
	40	"HDMI_DDC_CLK", config->ddc_clk_gpio, ret);
	41	goto error1;
	42	}
dada25bd RC	43	gpio_set_value_cansleep(config->ddc_clk_gpio, 1);
dada25bd RC	44
c8afe684 RC	45	ret = gpio_request(config->ddc_data_gpio, "HDMI_DDC_DATA");
	46	if (ret) {
	47	dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
	48	"HDMI_DDC_DATA", config->ddc_data_gpio, ret);
	49	goto error2;
	50	}
dada25bd RC	51	gpio_set_value_cansleep(config->ddc_data_gpio, 1);
dada25bd RC	52
c8afe684 RC	53	ret = gpio_request(config->hpd_gpio, "HDMI_HPD");
	54	if (ret) {
	55	dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
	56	"HDMI_HPD", config->hpd_gpio, ret);
	57	goto error3;
	58	}
dada25bd RC	59	gpio_direction_input(config->hpd_gpio);
	60	gpio_set_value_cansleep(config->hpd_gpio, 1);
	61
	62	if (config->mux_en_gpio != -1) {
	63	ret = gpio_request(config->mux_en_gpio, "HDMI_MUX_EN");
c8afe684 RC	64	if (ret) {
c8afe684 RC	65	dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
a2fe6cdc	66	"HDMI_MUX_EN", config->mux_en_gpio, ret);
c8afe684 RC	67	goto error4;
c8afe684 RC	68	}
dada25bd RC	69	gpio_set_value_cansleep(config->mux_en_gpio, 1);
	70	}
	71
	72	if (config->mux_sel_gpio != -1) {
	73	ret = gpio_request(config->mux_sel_gpio, "HDMI_MUX_SEL");
	74	if (ret) {
	75	dev_err(dev->dev, "'%s'(%d) gpio_request failed: %d\n",
	76	"HDMI_MUX_SEL", config->mux_sel_gpio, ret);
	77	goto error5;
	78	}
	79	gpio_set_value_cansleep(config->mux_sel_gpio, 0);
c8afe684	80	}
1930f38a BG	81
	82	if (config->mux_lpm_gpio != -1) {
	83	ret = gpio_request(config->mux_lpm_gpio,
	84	"HDMI_MUX_LPM");
	85	if (ret) {
	86	dev_err(dev->dev,
	87	"'%s'(%d) gpio_request failed: %d\n",
	88	"HDMI_MUX_LPM",
	89	config->mux_lpm_gpio, ret);
	90	goto error6;
	91	}
	92	gpio_set_value_cansleep(config->mux_lpm_gpio, 1);
	93	}
c8afe684 RC	94	DBG("gpio on");
	95	} else {
	96	gpio_free(config->ddc_clk_gpio);
	97	gpio_free(config->ddc_data_gpio);
	98	gpio_free(config->hpd_gpio);
	99
dada25bd RC	100	if (config->mux_en_gpio != -1) {
	101	gpio_set_value_cansleep(config->mux_en_gpio, 0);
	102	gpio_free(config->mux_en_gpio);
	103	}
	104
	105	if (config->mux_sel_gpio != -1) {
	106	gpio_set_value_cansleep(config->mux_sel_gpio, 1);
	107	gpio_free(config->mux_sel_gpio);
c8afe684	108	}
1930f38a BG	109
	110	if (config->mux_lpm_gpio != -1) {
	111	gpio_set_value_cansleep(config->mux_lpm_gpio, 0);
	112	gpio_free(config->mux_lpm_gpio);
	113	}
c8afe684 RC	114	DBG("gpio off");
	115	}
	116
	117	return 0;
	118
1930f38a BG	119	error6:
	120	if (config->mux_sel_gpio != -1)
	121	gpio_free(config->mux_sel_gpio);
dada25bd RC	122	error5:
	123	if (config->mux_en_gpio != -1)
	124	gpio_free(config->mux_en_gpio);
c8afe684 RC	125	error4:
	126	gpio_free(config->hpd_gpio);
	127	error3:
	128	gpio_free(config->ddc_data_gpio);
	129	error2:
	130	gpio_free(config->ddc_clk_gpio);
	131	error1:
	132	return ret;
	133	}
	134
	135	static int hpd_enable(struct hdmi_connector *hdmi_connector)
	136	{
a3376e3e	137	struct hdmi *hdmi = hdmi_connector->hdmi;
dada25bd	138	const struct hdmi_platform_config *config = hdmi->config;
a3376e3e	139	struct drm_device *dev = hdmi_connector->base.dev;
c8afe684 RC	140	struct hdmi_phy *phy = hdmi->phy;
c8afe684 RC	141	uint32_t hpd_ctrl;
dada25bd	142	int i, ret;
c8afe684	143
e6d7a16f JW	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->dev, "failed to enable hpd regulator: %s (%d)\n",
	148	config->hpd_reg_names[i], ret);
	149	goto fail;
	150	}
	151	}
	152
c8afe684 RC	153	ret = gpio_config(hdmi, true);
	154	if (ret) {
	155	dev_err(dev->dev, "failed to configure GPIOs: %d\n", ret);
	156	goto fail;
	157	}
	158
dada25bd	159	for (i = 0; i < config->hpd_clk_cnt; i++) {
b77f47e7 SV	160	if (config->hpd_freq && config->hpd_freq[i]) {
	161	ret = clk_set_rate(hdmi->hpd_clks[i],
	162	config->hpd_freq[i]);
	163	if (ret)
	164	dev_warn(dev->dev, "failed to set clk %s (%d)\n",
	165	config->hpd_clk_names[i], ret);
	166	}
	167
dada25bd RC	168	ret = clk_prepare_enable(hdmi->hpd_clks[i]);
	169	if (ret) {
	170	dev_err(dev->dev, "failed to enable hpd clk: %s (%d)\n",
	171	config->hpd_clk_names[i], ret);
	172	goto fail;
	173	}
c8afe684 RC	174	}
c8afe684 RC	175
c8afe684 RC	176	hdmi_set_mode(hdmi, false);
	177	phy->funcs->reset(phy);
	178	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	hpd_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
	189	hpd_ctrl \|= HDMI_HPD_CTRL_TIMEOUT(0x1fff);
	190
	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);
	196
	197	return 0;
	198
	199	fail:
	200	return ret;
	201	}
	202
e6d7a16f	203	static void hdp_disable(struct hdmi_connector *hdmi_connector)
c8afe684	204	{
a3376e3e	205	struct hdmi *hdmi = hdmi_connector->hdmi;
dada25bd	206	const struct hdmi_platform_config *config = hdmi->config;
a3376e3e	207	struct drm_device *dev = hdmi_connector->base.dev;
dada25bd	208	int i, ret = 0;
c8afe684 RC	209
	210	/* Disable HPD interrupt */
	211	hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, 0);
	212
	213	hdmi_set_mode(hdmi, false);
	214
dada25bd RC	215	for (i = 0; i < config->hpd_clk_cnt; i++)
dada25bd RC	216	clk_disable_unprepare(hdmi->hpd_clks[i]);
c8afe684 RC	217
c8afe684 RC	218	ret = gpio_config(hdmi, false);
e6d7a16f JW	219	if (ret)
e6d7a16f JW	220	dev_warn(dev->dev, "failed to unconfigure GPIOs: %d\n", ret);
c8afe684	221
e6d7a16f JW	222	for (i = 0; i < config->hpd_reg_cnt; i++) {
	223	ret = regulator_disable(hdmi->hpd_regs[i]);
	224	if (ret)
	225	dev_warn(dev->dev, "failed to disable hpd regulator: %s (%d)\n",
	226	config->hpd_reg_names[i], ret);
	227	}
c8afe684 RC	228	}
c8afe684 RC	229
dada25bd RC	230	static void
	231	hotplug_work(struct work_struct *work)
	232	{
	233	struct hdmi_connector *hdmi_connector =
	234	container_of(work, struct hdmi_connector, hpd_work);
	235	struct drm_connector *connector = &hdmi_connector->base;
	236	drm_helper_hpd_irq_event(connector->dev);
	237	}
	238
c8afe684 RC	239	void hdmi_connector_irq(struct drm_connector *connector)
c8afe684 RC	240	{
a3376e3e	241	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
dada25bd	242	struct msm_drm_private *priv = connector->dev->dev_private;
a3376e3e	243	struct hdmi *hdmi = hdmi_connector->hdmi;
c8afe684 RC	244	uint32_t hpd_int_status, hpd_int_ctrl;
	245
	246	/* Process HPD: */
	247	hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
	248	hpd_int_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_INT_CTRL);
	249
	250	if ((hpd_int_ctrl & HDMI_HPD_INT_CTRL_INT_EN) &&
	251	(hpd_int_status & HDMI_HPD_INT_STATUS_INT)) {
	252	bool detected = !!(hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED);
	253
ff2f974e	254	/* ack & disable (temporarily) HPD events: */
c8afe684	255	hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
ff2f974e JW	256	HDMI_HPD_INT_CTRL_INT_ACK);
	257
	258	DBG("status=%04x, ctrl=%04x", hpd_int_status, hpd_int_ctrl);
c8afe684	259
c8afe684 RC	260	/* detect disconnect if we are connected or visa versa: */
	261	hpd_int_ctrl = HDMI_HPD_INT_CTRL_INT_EN;
	262	if (!detected)
	263	hpd_int_ctrl \|= HDMI_HPD_INT_CTRL_INT_CONNECT;
	264	hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, hpd_int_ctrl);
dada25bd RC	265
dada25bd RC	266	queue_work(priv->wq, &hdmi_connector->hpd_work);
c8afe684 RC	267	}
	268	}
	269
3189650d RC	270	static enum drm_connector_status detect_reg(struct hdmi *hdmi)
	271	{
	272	uint32_t hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
	273	return (hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED) ?
	274	connector_status_connected : connector_status_disconnected;
	275	}
	276
	277	static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
	278	{
	279	const struct hdmi_platform_config *config = hdmi->config;
	280	return gpio_get_value(config->hpd_gpio) ?
	281	connector_status_connected :
	282	connector_status_disconnected;
	283	}
	284
c8afe684 RC	285	static enum drm_connector_status hdmi_connector_detect(
	286	struct drm_connector *connector, bool force)
	287	{
a3376e3e RC	288	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
a3376e3e RC	289	struct hdmi *hdmi = hdmi_connector->hdmi;
3189650d	290	enum drm_connector_status stat_gpio, stat_reg;
c8afe684 RC	291	int retry = 20;
c8afe684 RC	292
3189650d RC	293	do {
	294	stat_gpio = detect_gpio(hdmi);
	295	stat_reg = detect_reg(hdmi);
c8afe684	296
3189650d	297	if (stat_gpio == stat_reg)
dada25bd	298	break;
3189650d	299
c8afe684	300	mdelay(10);
3189650d RC	301	} while (--retry);
	302
	303	/* the status we get from reading gpio seems to be more reliable,
	304	* so trust that one the most if we didn't manage to get hdmi and
	305	* gpio status to agree:
	306	*/
	307	if (stat_gpio != stat_reg) {
	308	DBG("HDMI_HPD_INT_STATUS tells us: %d", stat_reg);
	309	DBG("hpd gpio tells us: %d", stat_gpio);
c8afe684 RC	310	}
c8afe684 RC	311
3189650d	312	return stat_gpio;
c8afe684 RC	313	}
	314
	315	static void hdmi_connector_destroy(struct drm_connector *connector)
	316	{
a3376e3e	317	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
c8afe684 RC	318
	319	hdp_disable(hdmi_connector);
	320
34ea3d38	321	drm_connector_unregister(connector);
c8afe684 RC	322	drm_connector_cleanup(connector);
c8afe684 RC	323
c8afe684 RC	324	kfree(hdmi_connector);
	325	}
	326
	327	static int hdmi_connector_get_modes(struct drm_connector *connector)
	328	{
a3376e3e RC	329	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
a3376e3e RC	330	struct hdmi *hdmi = hdmi_connector->hdmi;
c8afe684 RC	331	struct edid *edid;
	332	uint32_t hdmi_ctrl;
	333	int ret = 0;
	334
	335	hdmi_ctrl = hdmi_read(hdmi, REG_HDMI_CTRL);
	336	hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl \| HDMI_CTRL_ENABLE);
	337
	338	edid = drm_get_edid(connector, hdmi->i2c);
	339
	340	hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl);
	341
	342	drm_mode_connector_update_edid_property(connector, edid);
	343
	344	if (edid) {
	345	ret = drm_add_edid_modes(connector, edid);
	346	kfree(edid);
	347	}
	348
	349	return ret;
	350	}
	351
	352	static int hdmi_connector_mode_valid(struct drm_connector *connector,
	353	struct drm_display_mode *mode)
	354	{
a3376e3e	355	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
dada25bd RC	356	struct hdmi *hdmi = hdmi_connector->hdmi;
dada25bd RC	357	const struct hdmi_platform_config *config = hdmi->config;
c8afe684 RC	358	struct msm_drm_private *priv = connector->dev->dev_private;
	359	struct msm_kms *kms = priv->kms;
	360	long actual, requested;
	361
	362	requested = 1000 * mode->clock;
	363	actual = kms->funcs->round_pixclk(kms,
a3376e3e	364	requested, hdmi_connector->hdmi->encoder);
c8afe684	365
dada25bd RC	366	/* for mdp5/apq8074, we manage our own pixel clk (as opposed to
	367	* mdp4/dtv stuff where pixel clk is assigned to mdp/encoder
	368	* instead):
	369	*/
	370	if (config->pwr_clk_cnt > 0)
	371	actual = clk_round_rate(hdmi->pwr_clks[0], actual);
	372
c8afe684 RC	373	DBG("requested=%ld, actual=%ld", requested, actual);
	374
	375	if (actual != requested)
	376	return MODE_CLOCK_RANGE;
	377
	378	return 0;
	379	}
	380
a3376e3e RC	381	static struct drm_encoder *
	382	hdmi_connector_best_encoder(struct drm_connector *connector)
	383	{
	384	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
	385	return hdmi_connector->hdmi->encoder;
	386	}
	387
c8afe684	388	static const struct drm_connector_funcs hdmi_connector_funcs = {
0b776d45	389	.dpms = drm_atomic_helper_connector_dpms,
c8afe684 RC	390	.detect = hdmi_connector_detect,
	391	.fill_modes = drm_helper_probe_single_connector_modes,
	392	.destroy = hdmi_connector_destroy,
3e7849ef RC	393	.reset = drm_atomic_helper_connector_reset,
	394	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	395	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
c8afe684 RC	396	};
	397
	398	static const struct drm_connector_helper_funcs hdmi_connector_helper_funcs = {
	399	.get_modes = hdmi_connector_get_modes,
	400	.mode_valid = hdmi_connector_mode_valid,
a3376e3e	401	.best_encoder = hdmi_connector_best_encoder,
c8afe684 RC	402	};
	403
	404	/* initialize connector */
a3376e3e	405	struct drm_connector hdmi_connector_init(struct hdmi hdmi)
c8afe684 RC	406	{
	407	struct drm_connector *connector = NULL;
	408	struct hdmi_connector *hdmi_connector;
	409	int ret;
	410
	411	hdmi_connector = kzalloc(sizeof(*hdmi_connector), GFP_KERNEL);
	412	if (!hdmi_connector) {
	413	ret = -ENOMEM;
	414	goto fail;
	415	}
	416
d1a717bd	417	hdmi_connector->hdmi = hdmi;
dada25bd	418	INIT_WORK(&hdmi_connector->hpd_work, hotplug_work);
a3376e3e RC	419
a3376e3e RC	420	connector = &hdmi_connector->base;
c8afe684	421
a3376e3e	422	drm_connector_init(hdmi->dev, connector, &hdmi_connector_funcs,
c8afe684 RC	423	DRM_MODE_CONNECTOR_HDMIA);
	424	drm_connector_helper_add(connector, &hdmi_connector_helper_funcs);
	425
3189650d RC	426	connector->polled = DRM_CONNECTOR_POLL_CONNECT \|
3189650d RC	427	DRM_CONNECTOR_POLL_DISCONNECT;
c8afe684	428
cddfaebd	429	connector->interlace_allowed = 0;
c8afe684 RC	430	connector->doublescan_allowed = 0;
c8afe684 RC	431
34ea3d38	432	drm_connector_register(connector);
c8afe684	433
c8afe684 RC	434	ret = hpd_enable(hdmi_connector);
c8afe684 RC	435	if (ret) {
a3376e3e	436	dev_err(hdmi->dev->dev, "failed to enable HPD: %d\n", ret);
c8afe684 RC	437	goto fail;
	438	}
	439
a3376e3e	440	drm_mode_connector_attach_encoder(connector, hdmi->encoder);
c8afe684 RC	441
	442	return connector;
	443
	444	fail:
	445	if (connector)
	446	hdmi_connector_destroy(connector);
	447
	448	return ERR_PTR(ret);
	449	}