[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 <linux/pinctrl/consumer.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 void hdmi_phy_reset(struct hdmi *hdmi)
{
	unsigned int val;

	val = hdmi_read(hdmi, REG_HDMI_PHY_CTRL);

	if (val & HDMI_PHY_CTRL_SW_RESET_LOW) {
		/* pull low */
		hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
				val & ~HDMI_PHY_CTRL_SW_RESET);
	} else {
		/* pull high */
		hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
				val | HDMI_PHY_CTRL_SW_RESET);
	}

	if (val & HDMI_PHY_CTRL_SW_RESET_PLL_LOW) {
		/* pull low */
		hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
				val & ~HDMI_PHY_CTRL_SW_RESET_PLL);
	} else {
		/* pull high */
		hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
				val | HDMI_PHY_CTRL_SW_RESET_PLL);
	}

	msleep(100);

	if (val & HDMI_PHY_CTRL_SW_RESET_LOW) {
		/* pull high */
		hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
				val | HDMI_PHY_CTRL_SW_RESET);
	} else {
		/* pull low */
		hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
				val & ~HDMI_PHY_CTRL_SW_RESET);
	}

	if (val & HDMI_PHY_CTRL_SW_RESET_PLL_LOW) {
		/* pull high */
		hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
				val | HDMI_PHY_CTRL_SW_RESET_PLL);
	} else {
		/* pull low */
		hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
				val & ~HDMI_PHY_CTRL_SW_RESET_PLL);
	}
}

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

	if (on) {
		if (config->ddc_clk_gpio != -1) {
			ret = gpio_request(config->ddc_clk_gpio, "HDMI_DDC_CLK");
			if (ret) {
				dev_err(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);
		}

		if (config->ddc_data_gpio != -1) {
			ret = gpio_request(config->ddc_data_gpio, "HDMI_DDC_DATA");
			if (ret) {
				dev_err(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, "'%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, "'%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, "'%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,
					"'%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 {
		if (config->ddc_clk_gpio != -1)
			gpio_free(config->ddc_clk_gpio);

		if (config->ddc_data_gpio != -1)
			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:
	if (config->ddc_data_gpio != -1)
		gpio_free(config->ddc_data_gpio);
error2:
	if (config->ddc_clk_gpio != -1)
		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 device *dev = &hdmi->pdev->dev;
	uint32_t hpd_ctrl;
	int i, ret;
	unsigned long flags;

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

	ret = pinctrl_pm_select_default_state(dev);
	if (ret) {
		dev_err(dev, "pinctrl state chg failed: %d\n", ret);
		goto fail;
	}

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

	hdmi_set_mode(hdmi, false);
	hdmi_phy_reset(hdmi);
	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 */
	spin_lock_irqsave(&hdmi->reg_lock, flags);
	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);
	spin_unlock_irqrestore(&hdmi->reg_lock, flags);

	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 device *dev = &hdmi->pdev->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, "failed to unconfigure GPIOs: %d\n", ret);

	ret = pinctrl_pm_select_sleep_state(dev);
	if (ret)
		dev_warn(dev, "pinctrl state chg failed: %d\n", ret);

	for (i = 0; i < config->hpd_reg_cnt; i++) {
		ret = regulator_disable(hdmi->hpd_regs[i]);
		if (ret)
			dev_warn(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 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(hdmi->workq, &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);

	hdmi->hdmi_mode = drm_detect_hdmi_monitor(edid);
	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->pdev->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>
865807d0	19	#include <linux/pinctrl/consumer.h>
c8afe684	20
dd2da6e3	21	#include "msm_kms.h"
c8afe684 RC	22	#include "hdmi.h"
	23
	24	struct hdmi_connector {
a3376e3e RC	25	struct drm_connector base;
a3376e3e RC	26	struct hdmi *hdmi;
dada25bd	27	struct work_struct hpd_work;
c8afe684 RC	28	};
	29	#define to_hdmi_connector(x) container_of(x, struct hdmi_connector, base)
	30
da328552 SV	31	static void hdmi_phy_reset(struct hdmi *hdmi)
	32	{
	33	unsigned int val;
	34
	35	val = hdmi_read(hdmi, REG_HDMI_PHY_CTRL);
	36
	37	if (val & HDMI_PHY_CTRL_SW_RESET_LOW) {
	38	/* pull low */
	39	hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
	40	val & ~HDMI_PHY_CTRL_SW_RESET);
	41	} else {
	42	/* pull high */
	43	hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
	44	val \| HDMI_PHY_CTRL_SW_RESET);
	45	}
	46
	47	if (val & HDMI_PHY_CTRL_SW_RESET_PLL_LOW) {
	48	/* pull low */
	49	hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
	50	val & ~HDMI_PHY_CTRL_SW_RESET_PLL);
	51	} else {
	52	/* pull high */
	53	hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
	54	val \| HDMI_PHY_CTRL_SW_RESET_PLL);
	55	}
	56
	57	msleep(100);
	58
	59	if (val & HDMI_PHY_CTRL_SW_RESET_LOW) {
	60	/* pull high */
	61	hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
	62	val \| HDMI_PHY_CTRL_SW_RESET);
	63	} else {
	64	/* pull low */
	65	hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
	66	val & ~HDMI_PHY_CTRL_SW_RESET);
	67	}
	68
	69	if (val & HDMI_PHY_CTRL_SW_RESET_PLL_LOW) {
	70	/* pull high */
	71	hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
	72	val \| HDMI_PHY_CTRL_SW_RESET_PLL);
	73	} else {
	74	/* pull low */
	75	hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
	76	val & ~HDMI_PHY_CTRL_SW_RESET_PLL);
	77	}
	78	}
	79
c8afe684 RC	80	static int gpio_config(struct hdmi *hdmi, bool on)
c8afe684 RC	81	{
5e4eb82f	82	struct device *dev = &hdmi->pdev->dev;
dada25bd	83	const struct hdmi_platform_config *config = hdmi->config;
c8afe684 RC	84	int ret;
	85
	86	if (on) {
3a84f846 SV	87	if (config->ddc_clk_gpio != -1) {
	88	ret = gpio_request(config->ddc_clk_gpio, "HDMI_DDC_CLK");
	89	if (ret) {
	90	dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
	91	"HDMI_DDC_CLK", config->ddc_clk_gpio, ret);
	92	goto error1;
	93	}
	94	gpio_set_value_cansleep(config->ddc_clk_gpio, 1);
c8afe684	95	}
dada25bd	96
3a84f846 SV	97	if (config->ddc_data_gpio != -1) {
	98	ret = gpio_request(config->ddc_data_gpio, "HDMI_DDC_DATA");
	99	if (ret) {
	100	dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
	101	"HDMI_DDC_DATA", config->ddc_data_gpio, ret);
	102	goto error2;
	103	}
	104	gpio_set_value_cansleep(config->ddc_data_gpio, 1);
c8afe684	105	}
dada25bd	106
c8afe684 RC	107	ret = gpio_request(config->hpd_gpio, "HDMI_HPD");
c8afe684 RC	108	if (ret) {
5e4eb82f	109	dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
c8afe684 RC	110	"HDMI_HPD", config->hpd_gpio, ret);
	111	goto error3;
	112	}
dada25bd RC	113	gpio_direction_input(config->hpd_gpio);
	114	gpio_set_value_cansleep(config->hpd_gpio, 1);
	115
	116	if (config->mux_en_gpio != -1) {
	117	ret = gpio_request(config->mux_en_gpio, "HDMI_MUX_EN");
c8afe684	118	if (ret) {
5e4eb82f	119	dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
a2fe6cdc	120	"HDMI_MUX_EN", config->mux_en_gpio, ret);
c8afe684 RC	121	goto error4;
c8afe684 RC	122	}
dada25bd RC	123	gpio_set_value_cansleep(config->mux_en_gpio, 1);
	124	}
	125
	126	if (config->mux_sel_gpio != -1) {
	127	ret = gpio_request(config->mux_sel_gpio, "HDMI_MUX_SEL");
	128	if (ret) {
5e4eb82f	129	dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
dada25bd RC	130	"HDMI_MUX_SEL", config->mux_sel_gpio, ret);
	131	goto error5;
	132	}
	133	gpio_set_value_cansleep(config->mux_sel_gpio, 0);
c8afe684	134	}
1930f38a BG	135
	136	if (config->mux_lpm_gpio != -1) {
	137	ret = gpio_request(config->mux_lpm_gpio,
	138	"HDMI_MUX_LPM");
	139	if (ret) {
5e4eb82f	140	dev_err(dev,
1930f38a BG	141	"'%s'(%d) gpio_request failed: %d\n",
	142	"HDMI_MUX_LPM",
	143	config->mux_lpm_gpio, ret);
	144	goto error6;
	145	}
	146	gpio_set_value_cansleep(config->mux_lpm_gpio, 1);
	147	}
c8afe684 RC	148	DBG("gpio on");
c8afe684 RC	149	} else {
3a84f846 SV	150	if (config->ddc_clk_gpio != -1)
	151	gpio_free(config->ddc_clk_gpio);
	152
	153	if (config->ddc_data_gpio != -1)
	154	gpio_free(config->ddc_data_gpio);
	155
c8afe684 RC	156	gpio_free(config->hpd_gpio);
c8afe684 RC	157
dada25bd RC	158	if (config->mux_en_gpio != -1) {
	159	gpio_set_value_cansleep(config->mux_en_gpio, 0);
	160	gpio_free(config->mux_en_gpio);
	161	}
	162
	163	if (config->mux_sel_gpio != -1) {
	164	gpio_set_value_cansleep(config->mux_sel_gpio, 1);
	165	gpio_free(config->mux_sel_gpio);
c8afe684	166	}
1930f38a BG	167
	168	if (config->mux_lpm_gpio != -1) {
	169	gpio_set_value_cansleep(config->mux_lpm_gpio, 0);
	170	gpio_free(config->mux_lpm_gpio);
	171	}
c8afe684 RC	172	DBG("gpio off");
	173	}
	174
	175	return 0;
	176
1930f38a BG	177	error6:
	178	if (config->mux_sel_gpio != -1)
	179	gpio_free(config->mux_sel_gpio);
dada25bd RC	180	error5:
	181	if (config->mux_en_gpio != -1)
	182	gpio_free(config->mux_en_gpio);
c8afe684 RC	183	error4:
	184	gpio_free(config->hpd_gpio);
	185	error3:
3a84f846 SV	186	if (config->ddc_data_gpio != -1)
3a84f846 SV	187	gpio_free(config->ddc_data_gpio);
c8afe684	188	error2:
3a84f846 SV	189	if (config->ddc_clk_gpio != -1)
3a84f846 SV	190	gpio_free(config->ddc_clk_gpio);
c8afe684 RC	191	error1:
	192	return ret;
	193	}
	194
	195	static int hpd_enable(struct hdmi_connector *hdmi_connector)
	196	{
a3376e3e	197	struct hdmi *hdmi = hdmi_connector->hdmi;
dada25bd	198	const struct hdmi_platform_config *config = hdmi->config;
5e4eb82f	199	struct device *dev = &hdmi->pdev->dev;
c8afe684	200	uint32_t hpd_ctrl;
dada25bd	201	int i, ret;
c6a57a50	202	unsigned long flags;
c8afe684	203
e6d7a16f JW	204	for (i = 0; i < config->hpd_reg_cnt; i++) {
	205	ret = regulator_enable(hdmi->hpd_regs[i]);
	206	if (ret) {
5e4eb82f	207	dev_err(dev, "failed to enable hpd regulator: %s (%d)\n",
e6d7a16f JW	208	config->hpd_reg_names[i], ret);
	209	goto fail;
	210	}
	211	}
	212
865807d0 SV	213	ret = pinctrl_pm_select_default_state(dev);
	214	if (ret) {
	215	dev_err(dev, "pinctrl state chg failed: %d\n", ret);
	216	goto fail;
	217	}
	218
c8afe684 RC	219	ret = gpio_config(hdmi, true);
c8afe684 RC	220	if (ret) {
5e4eb82f	221	dev_err(dev, "failed to configure GPIOs: %d\n", ret);
c8afe684 RC	222	goto fail;
	223	}
	224
dada25bd	225	for (i = 0; i < config->hpd_clk_cnt; i++) {
b77f47e7 SV	226	if (config->hpd_freq && config->hpd_freq[i]) {
	227	ret = clk_set_rate(hdmi->hpd_clks[i],
	228	config->hpd_freq[i]);
	229	if (ret)
5e4eb82f	230	dev_warn(dev, "failed to set clk %s (%d)\n",
b77f47e7 SV	231	config->hpd_clk_names[i], ret);
	232	}
	233
dada25bd RC	234	ret = clk_prepare_enable(hdmi->hpd_clks[i]);
dada25bd RC	235	if (ret) {
5e4eb82f	236	dev_err(dev, "failed to enable hpd clk: %s (%d)\n",
dada25bd RC	237	config->hpd_clk_names[i], ret);
	238	goto fail;
	239	}
c8afe684 RC	240	}
c8afe684 RC	241
c8afe684	242	hdmi_set_mode(hdmi, false);
da328552	243	hdmi_phy_reset(hdmi);
c8afe684 RC	244	hdmi_set_mode(hdmi, true);
	245
	246	hdmi_write(hdmi, REG_HDMI_USEC_REFTIMER, 0x0001001b);
	247
	248	/* enable HPD events: */
	249	hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
	250	HDMI_HPD_INT_CTRL_INT_CONNECT \|
	251	HDMI_HPD_INT_CTRL_INT_EN);
	252
	253	/* set timeout to 4.1ms (max) for hardware debounce */
c6a57a50	254	spin_lock_irqsave(&hdmi->reg_lock, flags);
c8afe684 RC	255	hpd_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
	256	hpd_ctrl \|= HDMI_HPD_CTRL_TIMEOUT(0x1fff);
	257
	258	/* Toggle HPD circuit to trigger HPD sense */
	259	hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
	260	~HDMI_HPD_CTRL_ENABLE & hpd_ctrl);
	261	hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
	262	HDMI_HPD_CTRL_ENABLE \| hpd_ctrl);
c6a57a50	263	spin_unlock_irqrestore(&hdmi->reg_lock, flags);
c8afe684 RC	264
	265	return 0;
	266
	267	fail:
	268	return ret;
	269	}
	270
e6d7a16f	271	static void hdp_disable(struct hdmi_connector *hdmi_connector)
c8afe684	272	{
a3376e3e	273	struct hdmi *hdmi = hdmi_connector->hdmi;
dada25bd	274	const struct hdmi_platform_config *config = hdmi->config;
5e4eb82f	275	struct device *dev = &hdmi->pdev->dev;
dada25bd	276	int i, ret = 0;
c8afe684 RC	277
	278	/* Disable HPD interrupt */
	279	hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, 0);
	280
	281	hdmi_set_mode(hdmi, false);
	282
dada25bd RC	283	for (i = 0; i < config->hpd_clk_cnt; i++)
dada25bd RC	284	clk_disable_unprepare(hdmi->hpd_clks[i]);
c8afe684 RC	285
c8afe684 RC	286	ret = gpio_config(hdmi, false);
e6d7a16f	287	if (ret)
5e4eb82f	288	dev_warn(dev, "failed to unconfigure GPIOs: %d\n", ret);
c8afe684	289
865807d0 SV	290	ret = pinctrl_pm_select_sleep_state(dev);
	291	if (ret)
	292	dev_warn(dev, "pinctrl state chg failed: %d\n", ret);
	293
e6d7a16f JW	294	for (i = 0; i < config->hpd_reg_cnt; i++) {
	295	ret = regulator_disable(hdmi->hpd_regs[i]);
	296	if (ret)
5e4eb82f	297	dev_warn(dev, "failed to disable hpd regulator: %s (%d)\n",
e6d7a16f JW	298	config->hpd_reg_names[i], ret);
e6d7a16f JW	299	}
c8afe684 RC	300	}
c8afe684 RC	301
dada25bd RC	302	static void
	303	hotplug_work(struct work_struct *work)
	304	{
	305	struct hdmi_connector *hdmi_connector =
	306	container_of(work, struct hdmi_connector, hpd_work);
	307	struct drm_connector *connector = &hdmi_connector->base;
	308	drm_helper_hpd_irq_event(connector->dev);
	309	}
	310
c8afe684 RC	311	void hdmi_connector_irq(struct drm_connector *connector)
c8afe684 RC	312	{
a3376e3e RC	313	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
a3376e3e RC	314	struct hdmi *hdmi = hdmi_connector->hdmi;
c8afe684 RC	315	uint32_t hpd_int_status, hpd_int_ctrl;
	316
	317	/* Process HPD: */
	318	hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
	319	hpd_int_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_INT_CTRL);
	320
	321	if ((hpd_int_ctrl & HDMI_HPD_INT_CTRL_INT_EN) &&
	322	(hpd_int_status & HDMI_HPD_INT_STATUS_INT)) {
	323	bool detected = !!(hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED);
	324
ff2f974e	325	/* ack & disable (temporarily) HPD events: */
c8afe684	326	hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
ff2f974e JW	327	HDMI_HPD_INT_CTRL_INT_ACK);
	328
	329	DBG("status=%04x, ctrl=%04x", hpd_int_status, hpd_int_ctrl);
c8afe684	330
c8afe684 RC	331	/* detect disconnect if we are connected or visa versa: */
	332	hpd_int_ctrl = HDMI_HPD_INT_CTRL_INT_EN;
	333	if (!detected)
	334	hpd_int_ctrl \|= HDMI_HPD_INT_CTRL_INT_CONNECT;
	335	hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, hpd_int_ctrl);
dada25bd	336
c6a57a50	337	queue_work(hdmi->workq, &hdmi_connector->hpd_work);
c8afe684 RC	338	}
	339	}
	340
3189650d RC	341	static enum drm_connector_status detect_reg(struct hdmi *hdmi)
	342	{
	343	uint32_t hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
	344	return (hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED) ?
	345	connector_status_connected : connector_status_disconnected;
	346	}
	347
	348	static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
	349	{
	350	const struct hdmi_platform_config *config = hdmi->config;
	351	return gpio_get_value(config->hpd_gpio) ?
	352	connector_status_connected :
	353	connector_status_disconnected;
	354	}
	355
c8afe684 RC	356	static enum drm_connector_status hdmi_connector_detect(
	357	struct drm_connector *connector, bool force)
	358	{
a3376e3e RC	359	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
a3376e3e RC	360	struct hdmi *hdmi = hdmi_connector->hdmi;
3189650d	361	enum drm_connector_status stat_gpio, stat_reg;
c8afe684 RC	362	int retry = 20;
c8afe684 RC	363
3189650d RC	364	do {
	365	stat_gpio = detect_gpio(hdmi);
	366	stat_reg = detect_reg(hdmi);
c8afe684	367
3189650d	368	if (stat_gpio == stat_reg)
dada25bd	369	break;
3189650d	370
c8afe684	371	mdelay(10);
3189650d RC	372	} while (--retry);
	373
	374	/* the status we get from reading gpio seems to be more reliable,
	375	* so trust that one the most if we didn't manage to get hdmi and
	376	* gpio status to agree:
	377	*/
	378	if (stat_gpio != stat_reg) {
	379	DBG("HDMI_HPD_INT_STATUS tells us: %d", stat_reg);
	380	DBG("hpd gpio tells us: %d", stat_gpio);
c8afe684 RC	381	}
c8afe684 RC	382
3189650d	383	return stat_gpio;
c8afe684 RC	384	}
	385
	386	static void hdmi_connector_destroy(struct drm_connector *connector)
	387	{
a3376e3e	388	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
c8afe684 RC	389
	390	hdp_disable(hdmi_connector);
	391
34ea3d38	392	drm_connector_unregister(connector);
c8afe684 RC	393	drm_connector_cleanup(connector);
c8afe684 RC	394
c8afe684 RC	395	kfree(hdmi_connector);
	396	}
	397
	398	static int hdmi_connector_get_modes(struct drm_connector *connector)
	399	{
a3376e3e RC	400	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
a3376e3e RC	401	struct hdmi *hdmi = hdmi_connector->hdmi;
c8afe684 RC	402	struct edid *edid;
	403	uint32_t hdmi_ctrl;
	404	int ret = 0;
	405
	406	hdmi_ctrl = hdmi_read(hdmi, REG_HDMI_CTRL);
	407	hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl \| HDMI_CTRL_ENABLE);
	408
	409	edid = drm_get_edid(connector, hdmi->i2c);
	410
	411	hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl);
	412
c6a57a50	413	hdmi->hdmi_mode = drm_detect_hdmi_monitor(edid);
c8afe684 RC	414	drm_mode_connector_update_edid_property(connector, edid);
	415
	416	if (edid) {
	417	ret = drm_add_edid_modes(connector, edid);
	418	kfree(edid);
	419	}
	420
	421	return ret;
	422	}
	423
	424	static int hdmi_connector_mode_valid(struct drm_connector *connector,
	425	struct drm_display_mode *mode)
	426	{
a3376e3e	427	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
dada25bd RC	428	struct hdmi *hdmi = hdmi_connector->hdmi;
dada25bd RC	429	const struct hdmi_platform_config *config = hdmi->config;
c8afe684 RC	430	struct msm_drm_private *priv = connector->dev->dev_private;
	431	struct msm_kms *kms = priv->kms;
	432	long actual, requested;
	433
	434	requested = 1000 * mode->clock;
	435	actual = kms->funcs->round_pixclk(kms,
a3376e3e	436	requested, hdmi_connector->hdmi->encoder);
c8afe684	437
dada25bd RC	438	/* for mdp5/apq8074, we manage our own pixel clk (as opposed to
	439	* mdp4/dtv stuff where pixel clk is assigned to mdp/encoder
	440	* instead):
	441	*/
	442	if (config->pwr_clk_cnt > 0)
	443	actual = clk_round_rate(hdmi->pwr_clks[0], actual);
	444
c8afe684 RC	445	DBG("requested=%ld, actual=%ld", requested, actual);
	446
	447	if (actual != requested)
	448	return MODE_CLOCK_RANGE;
	449
	450	return 0;
	451	}
	452
a3376e3e RC	453	static struct drm_encoder *
	454	hdmi_connector_best_encoder(struct drm_connector *connector)
	455	{
	456	struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
	457	return hdmi_connector->hdmi->encoder;
	458	}
	459
c8afe684	460	static const struct drm_connector_funcs hdmi_connector_funcs = {
0b776d45	461	.dpms = drm_atomic_helper_connector_dpms,
c8afe684 RC	462	.detect = hdmi_connector_detect,
	463	.fill_modes = drm_helper_probe_single_connector_modes,
	464	.destroy = hdmi_connector_destroy,
3e7849ef RC	465	.reset = drm_atomic_helper_connector_reset,
	466	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	467	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
c8afe684 RC	468	};
	469
	470	static const struct drm_connector_helper_funcs hdmi_connector_helper_funcs = {
	471	.get_modes = hdmi_connector_get_modes,
	472	.mode_valid = hdmi_connector_mode_valid,
a3376e3e	473	.best_encoder = hdmi_connector_best_encoder,
c8afe684 RC	474	};
	475
	476	/* initialize connector */
a3376e3e	477	struct drm_connector hdmi_connector_init(struct hdmi hdmi)
c8afe684 RC	478	{
	479	struct drm_connector *connector = NULL;
	480	struct hdmi_connector *hdmi_connector;
	481	int ret;
	482
	483	hdmi_connector = kzalloc(sizeof(*hdmi_connector), GFP_KERNEL);
	484	if (!hdmi_connector) {
	485	ret = -ENOMEM;
	486	goto fail;
	487	}
	488
d1a717bd	489	hdmi_connector->hdmi = hdmi;
dada25bd	490	INIT_WORK(&hdmi_connector->hpd_work, hotplug_work);
a3376e3e RC	491
a3376e3e RC	492	connector = &hdmi_connector->base;
c8afe684	493
a3376e3e	494	drm_connector_init(hdmi->dev, connector, &hdmi_connector_funcs,
c8afe684 RC	495	DRM_MODE_CONNECTOR_HDMIA);
	496	drm_connector_helper_add(connector, &hdmi_connector_helper_funcs);
	497
3189650d RC	498	connector->polled = DRM_CONNECTOR_POLL_CONNECT \|
3189650d RC	499	DRM_CONNECTOR_POLL_DISCONNECT;
c8afe684	500
cddfaebd	501	connector->interlace_allowed = 0;
c8afe684 RC	502	connector->doublescan_allowed = 0;
c8afe684 RC	503
34ea3d38	504	drm_connector_register(connector);
c8afe684	505
c8afe684 RC	506	ret = hpd_enable(hdmi_connector);
c8afe684 RC	507	if (ret) {
5e4eb82f	508	dev_err(&hdmi->pdev->dev, "failed to enable HPD: %d\n", ret);
c8afe684 RC	509	goto fail;
	510	}
	511
a3376e3e	512	drm_mode_connector_attach_encoder(connector, hdmi->encoder);
c8afe684 RC	513
	514	return connector;
	515
	516	fail:
	517	if (connector)
	518	hdmi_connector_destroy(connector);
	519
	520	return ERR_PTR(ret);
	521	}