1 files changed, 477 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
new file mode 100644
index 000000000..30e908dfd
--- /dev/null
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
@@ -0,0 +1,477 @@
+/*
+ * 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 msm_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, i;
+
+	if (on) {
+		for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
+			struct hdmi_gpio_data gpio = config->gpios[i];
+
+			if (gpio.num != -1) {
+				ret = gpio_request(gpio.num, gpio.label);
+				if (ret) {
+					dev_err(dev,
+						"'%s'(%d) gpio_request failed: %d\n",
+						gpio.label, gpio.num, ret);
+					goto err;
+				}
+
+				if (gpio.output) {
+					gpio_direction_output(gpio.num,
+							      gpio.value);
+				} else {
+					gpio_direction_input(gpio.num);
+					gpio_set_value_cansleep(gpio.num,
+								gpio.value);
+				}
+			}
+		}
+
+		DBG("gpio on");
+	} else {
+		for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
+			struct hdmi_gpio_data gpio = config->gpios[i];
+
+			if (gpio.num == -1)
+				continue;
+
+			if (gpio.output) {
+				int value = gpio.value ? 0 : 1;
+
+				gpio_set_value_cansleep(gpio.num, value);
+			}
+
+			gpio_free(gpio.num);
+		};
+
+		DBG("gpio off");
+	}
+
+	return 0;
+err:
+	while (i--) {
+		if (config->gpios[i].num != -1)
+			gpio_free(config->gpios[i].num);
+	}
+
+	return ret;
+}
+
+static void enable_hpd_clocks(struct hdmi *hdmi, bool enable)
+{
+	const struct hdmi_platform_config *config = hdmi->config;
+	struct device *dev = &hdmi->pdev->dev;
+	int i, ret;
+
+	if (enable) {
+		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);
+			}
+		}
+	} else {
+		for (i = config->hpd_clk_cnt - 1; i >= 0; i--)
+			clk_disable_unprepare(hdmi->hpd_clks[i]);
+	}
+}
+
+int msm_hdmi_hpd_enable(struct drm_connector *connector)
+{
+	struct hdmi_connector *hdmi_connector = to_hdmi_connector(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;
+	}
+
+	pm_runtime_get_sync(dev);
+	enable_hpd_clocks(hdmi, true);
+
+	msm_hdmi_set_mode(hdmi, false);
+	msm_hdmi_phy_reset(hdmi);
+	msm_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);
+
+	msm_hdmi_set_mode(hdmi, false);
+
+	enable_hpd_clocks(hdmi, false);
+	pm_runtime_put_autosuspend(dev);
+
+	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
+msm_hdmi_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 msm_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;
+
+	pm_runtime_get_sync(&hdmi->pdev->dev);
+	enable_hpd_clocks(hdmi, true);
+
+	hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
+
+	enable_hpd_clocks(hdmi, false);
+	pm_runtime_put_autosuspend(&hdmi->pdev->dev);
+
+	return (hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED) ?
+			connector_status_connected : connector_status_disconnected;
+}
+
+#define HPD_GPIO_INDEX	2
+static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
+{
+	const struct hdmi_platform_config *config = hdmi->config;
+	struct hdmi_gpio_data hpd_gpio = config->gpios[HPD_GPIO_INDEX];
+
+	return gpio_get_value(hpd_gpio.num) ?
+			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;
+	const struct hdmi_platform_config *config = hdmi->config;
+	struct hdmi_gpio_data hpd_gpio = config->gpios[HPD_GPIO_INDEX];
+	enum drm_connector_status stat_gpio, stat_reg;
+	int retry = 20;
+
+	/*
+	 * some platforms may not have hpd gpio. Rely only on the status
+	 * provided by REG_HDMI_HPD_INT_STATUS in this case.
+	 */
+	if (hpd_gpio.num == -1)
+		return detect_reg(hdmi);
+
+	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_cleanup(connector);
+
+	kfree(hdmi_connector);
+}
+
+static int msm_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_connector_update_edid_property(connector, edid);
+
+	if (edid) {
+		ret = drm_add_edid_modes(connector, edid);
+		kfree(edid);
+	}
+
+	return ret;
+}
+
+static int msm_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 const struct drm_connector_funcs hdmi_connector_funcs = {
+	.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 msm_hdmi_connector_helper_funcs = {
+	.get_modes = msm_hdmi_connector_get_modes,
+	.mode_valid = msm_hdmi_connector_mode_valid,
+};
+
+/* initialize connector */
+struct drm_connector *msm_hdmi_connector_init(struct hdmi *hdmi)
+{
+	struct drm_connector *connector = NULL;
+	struct hdmi_connector *hdmi_connector;
+
+	hdmi_connector = kzalloc(sizeof(*hdmi_connector), GFP_KERNEL);
+	if (!hdmi_connector)
+		return ERR_PTR(-ENOMEM);
+
+	hdmi_connector->hdmi = hdmi;
+	INIT_WORK(&hdmi_connector->hpd_work, msm_hdmi_hotplug_work);
+
+	connector = &hdmi_connector->base;
+
+	drm_connector_init(hdmi->dev, connector, &hdmi_connector_funcs,
+			DRM_MODE_CONNECTOR_HDMIA);
+	drm_connector_helper_add(connector, &msm_hdmi_connector_helper_funcs);
+
+	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
+			DRM_CONNECTOR_POLL_DISCONNECT;
+
+	connector->interlace_allowed = 0;
+	connector->doublescan_allowed = 0;
+
+	drm_connector_attach_encoder(connector, hdmi->encoder);
+
+	return connector;
+}