--- /dev/null
+/*
+ * 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);
+}
Code Review / kvmfornfv.git / blobdiff