[mirror_ubuntu-focal-kernel.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_SEL", 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);
		}
		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);
		}
		DBG("gpio off");
	}

	return 0;

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;

	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;
		}
	}

	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;
		}
	}

	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 int 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_reg_cnt; i++) {
		ret = regulator_disable(hdmi->hpd_regs[i]);
		if (ret) {
			dev_err(dev->dev, "failed to disable hpd regulator: %s (%d)\n",
					config->hpd_reg_names[i], ret);
			goto fail;
		}
	}

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

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

	return 0;

fail:
	return 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);

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

		/* ack the irq: */
		hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
				hpd_int_ctrl | HDMI_HPD_INT_CTRL_INT_ACK);

		/* 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);

	hdmi_unreference(hdmi_connector->hdmi);

	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_helper_connector_dpms,
	.detect = hdmi_connector_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = hdmi_connector_destroy,
};

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_reference(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 = 1;
	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",
dada25bd	66	"HDMI_MUX_SEL", 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 RC	80	}
	81	DBG("gpio on");
	82	} else {
	83	gpio_free(config->ddc_clk_gpio);
	84	gpio_free(config->ddc_data_gpio);
	85	gpio_free(config->hpd_gpio);
	86
dada25bd RC	87	if (config->mux_en_gpio != -1) {
	88	gpio_set_value_cansleep(config->mux_en_gpio, 0);
	89	gpio_free(config->mux_en_gpio);
	90	}
	91
	92	if (config->mux_sel_gpio != -1) {
	93	gpio_set_value_cansleep(config->mux_sel_gpio, 1);
	94	gpio_free(config->mux_sel_gpio);
c8afe684 RC	95	}
	96	DBG("gpio off");
	97	}
	98
	99	return 0;
	100
dada25bd RC	101	error5:
	102	if (config->mux_en_gpio != -1)
	103	gpio_free(config->mux_en_gpio);
c8afe684 RC	104	error4:
	105	gpio_free(config->hpd_gpio);
	106	error3:
	107	gpio_free(config->ddc_data_gpio);
	108	error2:
	109	gpio_free(config->ddc_clk_gpio);
	110	error1:
	111	return ret;
	112	}
	113
	114	static int hpd_enable(struct hdmi_connector *hdmi_connector)
	115	{
a3376e3e	116	struct hdmi *hdmi = hdmi_connector->hdmi;
dada25bd	117	const struct hdmi_platform_config *config = hdmi->config;
a3376e3e	118	struct drm_device *dev = hdmi_connector->base.dev;
c8afe684 RC	119	struct hdmi_phy *phy = hdmi->phy;
c8afe684 RC	120	uint32_t hpd_ctrl;
dada25bd	121	int i, ret;
c8afe684 RC	122
	123	ret = gpio_config(hdmi, true);
	124	if (ret) {
	125	dev_err(dev->dev, "failed to configure GPIOs: %d\n", ret);
	126	goto fail;
	127	}
	128
dada25bd	129	for (i = 0; i < config->hpd_clk_cnt; i++) {
b77f47e7 SV	130	if (config->hpd_freq && config->hpd_freq[i]) {
	131	ret = clk_set_rate(hdmi->hpd_clks[i],
	132	config->hpd_freq[i]);
	133	if (ret)
	134	dev_warn(dev->dev, "failed to set clk %s (%d)\n",
	135	config->hpd_clk_names[i], ret);
	136	}
	137
dada25bd RC	138	ret = clk_prepare_enable(hdmi->hpd_clks[i]);
	139	if (ret) {
	140	dev_err(dev->dev, "failed to enable hpd clk: %s (%d)\n",
	141	config->hpd_clk_names[i], ret);
	142	goto fail;
	143	}
c8afe684 RC	144	}
c8afe684 RC	145
dada25bd RC	146	for (i = 0; i < config->hpd_reg_cnt; i++) {
	147	ret = regulator_enable(hdmi->hpd_regs[i]);
	148	if (ret) {
	149	dev_err(dev->dev, "failed to enable hpd regulator: %s (%d)\n",
	150	config->hpd_reg_names[i], ret);
	151	goto fail;
	152	}
c8afe684 RC	153	}
	154
	155	hdmi_set_mode(hdmi, false);
	156	phy->funcs->reset(phy);
	157	hdmi_set_mode(hdmi, true);
	158
	159	hdmi_write(hdmi, REG_HDMI_USEC_REFTIMER, 0x0001001b);
	160
	161	/* enable HPD events: */
	162	hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
	163	HDMI_HPD_INT_CTRL_INT_CONNECT \|
	164	HDMI_HPD_INT_CTRL_INT_EN);
	165
	166	/* set timeout to 4.1ms (max) for hardware debounce */
	167	hpd_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
	168	hpd_ctrl \|= HDMI_HPD_CTRL_TIMEOUT(0x1fff);
	169
	170	/* Toggle HPD circuit to trigger HPD sense */
	171	hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
	172	~HDMI_HPD_CTRL_ENABLE & hpd_ctrl);
	173	hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
	174	HDMI_HPD_CTRL_ENABLE \| hpd_ctrl);
	175
	176	return 0;
	177
	178	fail:
	179	return ret;
	180	}
	181
	182	static int hdp_disable(struct hdmi_connector *hdmi_connector)
	183	{
a3376e3e	184	struct hdmi *hdmi = hdmi_connector->hdmi;
dada25bd	185	const struct hdmi_platform_config *config = hdmi->config;
a3376e3e	186	struct drm_device *dev = hdmi_connector->base.dev;
dada25bd	187	int i, ret = 0;
c8afe684 RC	188
	189	/* Disable HPD interrupt */
	190	hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, 0);
	191
	192	hdmi_set_mode(hdmi, false);
	193
dada25bd RC	194	for (i = 0; i < config->hpd_reg_cnt; i++) {
	195	ret = regulator_disable(hdmi->hpd_regs[i]);
	196	if (ret) {
	197	dev_err(dev->dev, "failed to disable hpd regulator: %s (%d)\n",
	198	config->hpd_reg_names[i], ret);
	199	goto fail;
	200	}
c8afe684 RC	201	}
c8afe684 RC	202
dada25bd RC	203	for (i = 0; i < config->hpd_clk_cnt; i++)
dada25bd RC	204	clk_disable_unprepare(hdmi->hpd_clks[i]);
c8afe684 RC	205
	206	ret = gpio_config(hdmi, false);
	207	if (ret) {
	208	dev_err(dev->dev, "failed to unconfigure GPIOs: %d\n", ret);
	209	goto fail;
	210	}
	211
	212	return 0;
	213
	214	fail:
	215	return ret;
	216	}
	217
dada25bd RC	218	static void
	219	hotplug_work(struct work_struct *work)
	220	{
	221	struct hdmi_connector *hdmi_connector =
	222	container_of(work, struct hdmi_connector, hpd_work);
	223	struct drm_connector *connector = &hdmi_connector->base;
	224	drm_helper_hpd_irq_event(connector->dev);
	225	}
	226
c8afe684 RC	227	void hdmi_connector_irq(struct drm_connector *connector)
c8afe684 RC	228	{
a3376e3e	229	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
dada25bd	230	struct msm_drm_private *priv = connector->dev->dev_private;
a3376e3e	231	struct hdmi *hdmi = hdmi_connector->hdmi;
c8afe684 RC	232	uint32_t hpd_int_status, hpd_int_ctrl;
	233
	234	/* Process HPD: */
	235	hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
	236	hpd_int_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_INT_CTRL);
	237
	238	if ((hpd_int_ctrl & HDMI_HPD_INT_CTRL_INT_EN) &&
	239	(hpd_int_status & HDMI_HPD_INT_STATUS_INT)) {
	240	bool detected = !!(hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED);
	241
	242	DBG("status=%04x, ctrl=%04x", hpd_int_status, hpd_int_ctrl);
	243
	244	/* ack the irq: */
	245	hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
	246	hpd_int_ctrl \| HDMI_HPD_INT_CTRL_INT_ACK);
	247
c8afe684 RC	248	/* detect disconnect if we are connected or visa versa: */
	249	hpd_int_ctrl = HDMI_HPD_INT_CTRL_INT_EN;
	250	if (!detected)
	251	hpd_int_ctrl \|= HDMI_HPD_INT_CTRL_INT_CONNECT;
	252	hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, hpd_int_ctrl);
dada25bd RC	253
dada25bd RC	254	queue_work(priv->wq, &hdmi_connector->hpd_work);
c8afe684 RC	255	}
	256	}
	257
3189650d RC	258	static enum drm_connector_status detect_reg(struct hdmi *hdmi)
	259	{
	260	uint32_t hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
	261	return (hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED) ?
	262	connector_status_connected : connector_status_disconnected;
	263	}
	264
	265	static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
	266	{
	267	const struct hdmi_platform_config *config = hdmi->config;
	268	return gpio_get_value(config->hpd_gpio) ?
	269	connector_status_connected :
	270	connector_status_disconnected;
	271	}
	272
c8afe684 RC	273	static enum drm_connector_status hdmi_connector_detect(
	274	struct drm_connector *connector, bool force)
	275	{
a3376e3e RC	276	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
a3376e3e RC	277	struct hdmi *hdmi = hdmi_connector->hdmi;
3189650d	278	enum drm_connector_status stat_gpio, stat_reg;
c8afe684 RC	279	int retry = 20;
c8afe684 RC	280
3189650d RC	281	do {
	282	stat_gpio = detect_gpio(hdmi);
	283	stat_reg = detect_reg(hdmi);
c8afe684	284
3189650d	285	if (stat_gpio == stat_reg)
dada25bd	286	break;
3189650d	287
c8afe684	288	mdelay(10);
3189650d RC	289	} while (--retry);
	290
	291	/* the status we get from reading gpio seems to be more reliable,
	292	* so trust that one the most if we didn't manage to get hdmi and
	293	* gpio status to agree:
	294	*/
	295	if (stat_gpio != stat_reg) {
	296	DBG("HDMI_HPD_INT_STATUS tells us: %d", stat_reg);
	297	DBG("hpd gpio tells us: %d", stat_gpio);
c8afe684 RC	298	}
c8afe684 RC	299
3189650d	300	return stat_gpio;
c8afe684 RC	301	}
	302
	303	static void hdmi_connector_destroy(struct drm_connector *connector)
	304	{
a3376e3e	305	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
c8afe684 RC	306
	307	hdp_disable(hdmi_connector);
	308
34ea3d38	309	drm_connector_unregister(connector);
c8afe684 RC	310	drm_connector_cleanup(connector);
c8afe684 RC	311
a3376e3e	312	hdmi_unreference(hdmi_connector->hdmi);
c8afe684 RC	313
	314	kfree(hdmi_connector);
	315	}
	316
	317	static int hdmi_connector_get_modes(struct drm_connector *connector)
	318	{
a3376e3e RC	319	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
a3376e3e RC	320	struct hdmi *hdmi = hdmi_connector->hdmi;
c8afe684 RC	321	struct edid *edid;
	322	uint32_t hdmi_ctrl;
	323	int ret = 0;
	324
	325	hdmi_ctrl = hdmi_read(hdmi, REG_HDMI_CTRL);
	326	hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl \| HDMI_CTRL_ENABLE);
	327
	328	edid = drm_get_edid(connector, hdmi->i2c);
	329
	330	hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl);
	331
	332	drm_mode_connector_update_edid_property(connector, edid);
	333
	334	if (edid) {
	335	ret = drm_add_edid_modes(connector, edid);
	336	kfree(edid);
	337	}
	338
	339	return ret;
	340	}
	341
	342	static int hdmi_connector_mode_valid(struct drm_connector *connector,
	343	struct drm_display_mode *mode)
	344	{
a3376e3e	345	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
dada25bd RC	346	struct hdmi *hdmi = hdmi_connector->hdmi;
dada25bd RC	347	const struct hdmi_platform_config *config = hdmi->config;
c8afe684 RC	348	struct msm_drm_private *priv = connector->dev->dev_private;
	349	struct msm_kms *kms = priv->kms;
	350	long actual, requested;
	351
	352	requested = 1000 * mode->clock;
	353	actual = kms->funcs->round_pixclk(kms,
a3376e3e	354	requested, hdmi_connector->hdmi->encoder);
c8afe684	355
dada25bd RC	356	/* for mdp5/apq8074, we manage our own pixel clk (as opposed to
	357	* mdp4/dtv stuff where pixel clk is assigned to mdp/encoder
	358	* instead):
	359	*/
	360	if (config->pwr_clk_cnt > 0)
	361	actual = clk_round_rate(hdmi->pwr_clks[0], actual);
	362
c8afe684 RC	363	DBG("requested=%ld, actual=%ld", requested, actual);
	364
	365	if (actual != requested)
	366	return MODE_CLOCK_RANGE;
	367
	368	return 0;
	369	}
	370
a3376e3e RC	371	static struct drm_encoder *
	372	hdmi_connector_best_encoder(struct drm_connector *connector)
	373	{
	374	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
	375	return hdmi_connector->hdmi->encoder;
	376	}
	377
c8afe684 RC	378	static const struct drm_connector_funcs hdmi_connector_funcs = {
	379	.dpms = drm_helper_connector_dpms,
	380	.detect = hdmi_connector_detect,
	381	.fill_modes = drm_helper_probe_single_connector_modes,
	382	.destroy = hdmi_connector_destroy,
	383	};
	384
	385	static const struct drm_connector_helper_funcs hdmi_connector_helper_funcs = {
	386	.get_modes = hdmi_connector_get_modes,
	387	.mode_valid = hdmi_connector_mode_valid,
a3376e3e	388	.best_encoder = hdmi_connector_best_encoder,
c8afe684 RC	389	};
	390
	391	/* initialize connector */
a3376e3e	392	struct drm_connector hdmi_connector_init(struct hdmi hdmi)
c8afe684 RC	393	{
	394	struct drm_connector *connector = NULL;
	395	struct hdmi_connector *hdmi_connector;
	396	int ret;
	397
	398	hdmi_connector = kzalloc(sizeof(*hdmi_connector), GFP_KERNEL);
	399	if (!hdmi_connector) {
	400	ret = -ENOMEM;
	401	goto fail;
	402	}
	403
a3376e3e	404	hdmi_connector->hdmi = hdmi_reference(hdmi);
dada25bd	405	INIT_WORK(&hdmi_connector->hpd_work, hotplug_work);
a3376e3e RC	406
a3376e3e RC	407	connector = &hdmi_connector->base;
c8afe684	408
a3376e3e	409	drm_connector_init(hdmi->dev, connector, &hdmi_connector_funcs,
c8afe684 RC	410	DRM_MODE_CONNECTOR_HDMIA);
	411	drm_connector_helper_add(connector, &hdmi_connector_helper_funcs);
	412
3189650d RC	413	connector->polled = DRM_CONNECTOR_POLL_CONNECT \|
3189650d RC	414	DRM_CONNECTOR_POLL_DISCONNECT;
c8afe684 RC	415
	416	connector->interlace_allowed = 1;
	417	connector->doublescan_allowed = 0;
	418
34ea3d38	419	drm_connector_register(connector);
c8afe684	420
c8afe684 RC	421	ret = hpd_enable(hdmi_connector);
c8afe684 RC	422	if (ret) {
a3376e3e	423	dev_err(hdmi->dev->dev, "failed to enable HPD: %d\n", ret);
c8afe684 RC	424	goto fail;
	425	}
	426
a3376e3e	427	drm_mode_connector_attach_encoder(connector, hdmi->encoder);
c8afe684 RC	428
	429	return connector;
	430
	431	fail:
	432	if (connector)
	433	hdmi_connector_destroy(connector);
	434
	435	return ERR_PTR(ret);
	436	}