Quelle  hdmi.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2014 The Linux Foundation. All rights reserved.
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 */

#include <linux/gpio/consumer.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>

#include <drm/drm_bridge_connector.h>
#include <drm/drm_of.h>
#include <drm/display/drm_hdmi_state_helper.h>

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

void msm_hdmi_set_mode(struct hdmi *hdmi, bool power_on)
{
 uint32_t ctrl = 0;
 unsigned long flags;

 spin_lock_irqsave(&hdmi->reg_lock, flags);
 if (power_on) {
  ctrl |= HDMI_CTRL_ENABLE;
  if (!hdmi->connector->display_info.is_hdmi) {
   ctrl |= HDMI_CTRL_HDMI;
   hdmi_write(hdmi, REG_HDMI_CTRL, ctrl);
   ctrl &= ~HDMI_CTRL_HDMI;
  } else {
   ctrl |= HDMI_CTRL_HDMI;
  }
 } else {
  ctrl = HDMI_CTRL_HDMI;
 }

 hdmi_write(hdmi, REG_HDMI_CTRL, ctrl);
 spin_unlock_irqrestore(&hdmi->reg_lock, flags);
 DBG("HDMI Core: %s, HDMI_CTRL=0x%08x",
   power_on ? "Enable" : "Disable", ctrl);
}

static irqreturn_t msm_hdmi_irq(int irq, void *dev_id)
{
 struct hdmi *hdmi = dev_id;

 /* Process HPD: */
 msm_hdmi_hpd_irq(hdmi->bridge);

 /* Process DDC: */
 msm_hdmi_i2c_irq(hdmi->i2c);

 /* Process HDCP: */
 if (hdmi->hdcp_ctrl)
  msm_hdmi_hdcp_irq(hdmi->hdcp_ctrl);

 /* TODO audio.. */

 return IRQ_HANDLED;
}

static void msm_hdmi_destroy(struct hdmi *hdmi)
{
 /*
 * at this point, hpd has been disabled,
 * after flush workq, it's safe to deinit hdcp
 */
 if (hdmi->workq)
  destroy_workqueue(hdmi->workq);
 msm_hdmi_hdcp_destroy(hdmi);

 if (hdmi->i2c)
  msm_hdmi_i2c_destroy(hdmi->i2c);
}

static void msm_hdmi_put_phy(struct hdmi *hdmi)
{
 if (hdmi->phy_dev) {
  put_device(hdmi->phy_dev);
  hdmi->phy = NULL;
  hdmi->phy_dev = NULL;
 }
}

static int msm_hdmi_get_phy(struct hdmi *hdmi)
{
 struct platform_device *pdev = hdmi->pdev;
 struct platform_device *phy_pdev;
 struct device_node *phy_node;

 phy_node = of_parse_phandle(pdev->dev.of_node, "phys", 0);
 if (!phy_node) {
  DRM_DEV_ERROR(&pdev->dev, "cannot find phy device\n");
  return -ENXIO;
 }

 phy_pdev = of_find_device_by_node(phy_node);
 of_node_put(phy_node);

 if (!phy_pdev)
  return dev_err_probe(&pdev->dev, -EPROBE_DEFER, "phy driver is not ready\n");

 hdmi->phy = platform_get_drvdata(phy_pdev);
 if (!hdmi->phy) {
  put_device(&phy_pdev->dev);
  return dev_err_probe(&pdev->dev, -EPROBE_DEFER, "phy driver is not ready\n");
 }

 hdmi->phy_dev = &phy_pdev->dev;

 return 0;
}

/* construct hdmi at bind/probe time, grab all the resources.  If
 * we are to EPROBE_DEFER we want to do it here, rather than later
 * at modeset_init() time
 */
static int msm_hdmi_init(struct hdmi *hdmi)
{
 struct platform_device *pdev = hdmi->pdev;
 int ret;

 hdmi->workq = alloc_ordered_workqueue("msm_hdmi", 0);
 if (!hdmi->workq) {
  ret = -ENOMEM;
  goto fail;
 }

 hdmi->i2c = msm_hdmi_i2c_init(hdmi);
 if (IS_ERR(hdmi->i2c)) {
  ret = PTR_ERR(hdmi->i2c);
  DRM_DEV_ERROR(&pdev->dev, "failed to get i2c: %d\n", ret);
  hdmi->i2c = NULL;
  goto fail;
 }

 hdmi->hdcp_ctrl = msm_hdmi_hdcp_init(hdmi);
 if (IS_ERR(hdmi->hdcp_ctrl)) {
  dev_warn(&pdev->dev, "failed to init hdcp: disabled\n");
  hdmi->hdcp_ctrl = NULL;
 }

 return 0;

fail:
 msm_hdmi_destroy(hdmi);

 return ret;
}

/* Second part of initialization, the drm/kms level modeset_init,
 * constructs/initializes mode objects, etc, is called from master
 * driver (not hdmi sub-device's probe/bind!)
 *
 * Any resource (regulator/clk/etc) which could be missing at boot
 * should be handled in msm_hdmi_init() so that failure happens from
 * hdmi sub-device's probe.
 */
int msm_hdmi_modeset_init(struct hdmi *hdmi,
  struct drm_device *dev, struct drm_encoder *encoder)
{
 int ret;

 hdmi->dev = dev;
 hdmi->encoder = encoder;

 ret = msm_hdmi_bridge_init(hdmi);
 if (ret) {
  DRM_DEV_ERROR(dev->dev, "failed to create HDMI bridge: %d\n", ret);
  goto fail;
 }

 if (hdmi->next_bridge) {
  ret = drm_bridge_attach(hdmi->encoder, hdmi->next_bridge, hdmi->bridge,
     DRM_BRIDGE_ATTACH_NO_CONNECTOR);
  if (ret) {
   DRM_DEV_ERROR(dev->dev, "failed to attach next HDMI bridge: %d\n", ret);
   goto fail;
  }
 }

 hdmi->connector = drm_bridge_connector_init(hdmi->dev, encoder);
 if (IS_ERR(hdmi->connector)) {
  ret = PTR_ERR(hdmi->connector);
  DRM_DEV_ERROR(dev->dev, "failed to create HDMI connector: %d\n", ret);
  hdmi->connector = NULL;
  goto fail;
 }

 drm_connector_attach_encoder(hdmi->connector, hdmi->encoder);

 ret = devm_request_irq(dev->dev, hdmi->irq,
   msm_hdmi_irq, IRQF_TRIGGER_HIGH,
   "hdmi_isr", hdmi);
 if (ret < 0) {
  DRM_DEV_ERROR(dev->dev, "failed to request IRQ%u: %d\n",
    hdmi->irq, ret);
  goto fail;
 }

 return 0;

fail:
 if (hdmi->connector) {
  hdmi->connector->funcs->destroy(hdmi->connector);
  hdmi->connector = NULL;
 }

 return ret;
}

/*
 * The hdmi device:
 */

static const char * const pwr_reg_names_8960[] = {"core-vdda"};
static const char * const pwr_clk_names_8960[] = {"core", "master_iface", "slave_iface"};

static const struct hdmi_platform_config hdmi_tx_8960_config = {
 .pwr_reg_names = pwr_reg_names_8960,
 .pwr_reg_cnt = ARRAY_SIZE(pwr_reg_names_8960),
 .pwr_clk_names = pwr_clk_names_8960,
 .pwr_clk_cnt = ARRAY_SIZE(pwr_clk_names_8960),
};

static const char * const pwr_reg_names_8x74[] = {"core-vdda", "core-vcc"};
static const char * const pwr_clk_names_8x74[] = {"iface", "core", "mdp_core", "alt_iface"};

static const struct hdmi_platform_config hdmi_tx_8974_config = {
 .pwr_reg_names = pwr_reg_names_8x74,
 .pwr_reg_cnt = ARRAY_SIZE(pwr_reg_names_8x74),
 .pwr_clk_names = pwr_clk_names_8x74,
 .pwr_clk_cnt = ARRAY_SIZE(pwr_clk_names_8x74),
};

static int msm_hdmi_bind(struct device *dev, struct device *master, void *data)
{
 struct msm_drm_private *priv = dev_get_drvdata(master);
 struct hdmi *hdmi = dev_get_drvdata(dev);
 int err;

 err = msm_hdmi_init(hdmi);
 if (err)
  return err;
 priv->kms->hdmi = hdmi;

 return 0;
}

static void msm_hdmi_unbind(struct device *dev, struct device *master,
  void *data)
{
 struct msm_drm_private *priv = dev_get_drvdata(master);

 if (priv->kms->hdmi) {
  msm_hdmi_destroy(priv->kms->hdmi);
  priv->kms->hdmi = NULL;
 }
}

static const struct component_ops msm_hdmi_ops = {
  .bind   = msm_hdmi_bind,
  .unbind = msm_hdmi_unbind,
};

static int msm_hdmi_dev_probe(struct platform_device *pdev)
{
 const struct hdmi_platform_config *config;
 struct device *dev = &pdev->dev;
 struct hdmi *hdmi;
 struct resource *res;
 int i, ret;

 config = of_device_get_match_data(dev);
 if (!config)
  return -EINVAL;

 hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
 if (!hdmi)
  return -ENOMEM;

 hdmi->pdev = pdev;
 hdmi->config = config;
 spin_lock_init(&hdmi->reg_lock);
 mutex_init(&hdmi->state_mutex);

 ret = drm_of_find_panel_or_bridge(pdev->dev.of_node, 1, 0, NULL, &hdmi->next_bridge);
 if (ret && ret != -ENODEV)
  return ret;

 hdmi->mmio = msm_ioremap(pdev, "core_physical");
 if (IS_ERR(hdmi->mmio))
  return PTR_ERR(hdmi->mmio);

 /* HDCP needs physical address of hdmi register */
 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
  "core_physical");
 if (!res)
  return -EINVAL;
 hdmi->mmio_phy_addr = res->start;

 hdmi->qfprom_mmio = msm_ioremap(pdev, "qfprom_physical");
 if (IS_ERR(hdmi->qfprom_mmio)) {
  DRM_DEV_INFO(&pdev->dev, "can't find qfprom resource\n");
  hdmi->qfprom_mmio = NULL;
 }

 hdmi->irq = platform_get_irq(pdev, 0);
 if (hdmi->irq < 0)
  return hdmi->irq;

 hdmi->pwr_regs = devm_kcalloc(&pdev->dev,
          config->pwr_reg_cnt,
          sizeof(hdmi->pwr_regs[0]),
          GFP_KERNEL);
 if (!hdmi->pwr_regs)
  return -ENOMEM;

 for (i = 0; i < config->pwr_reg_cnt; i++)
  hdmi->pwr_regs[i].supply = config->pwr_reg_names[i];

 ret = devm_regulator_bulk_get(&pdev->dev, config->pwr_reg_cnt, hdmi->pwr_regs);
 if (ret)
  return dev_err_probe(dev, ret, "failed to get pwr regulators\n");

 hdmi->pwr_clks = devm_kcalloc(&pdev->dev,
          config->pwr_clk_cnt,
          sizeof(hdmi->pwr_clks[0]),
          GFP_KERNEL);
 if (!hdmi->pwr_clks)
  return -ENOMEM;

 for (i = 0; i < config->pwr_clk_cnt; i++)
  hdmi->pwr_clks[i].id = config->pwr_clk_names[i];

 ret = devm_clk_bulk_get(&pdev->dev, config->pwr_clk_cnt, hdmi->pwr_clks);
 if (ret)
  return ret;

 hdmi->extp_clk = devm_clk_get_optional(&pdev->dev, "extp");
 if (IS_ERR(hdmi->extp_clk))
  return dev_err_probe(dev, PTR_ERR(hdmi->extp_clk),
         "failed to get extp clock\n");

 hdmi->hpd_gpiod = devm_gpiod_get_optional(&pdev->dev, "hpd", GPIOD_IN);
 /* This will catch e.g. -EPROBE_DEFER */
 if (IS_ERR(hdmi->hpd_gpiod))
  return dev_err_probe(dev, PTR_ERR(hdmi->hpd_gpiod),
         "failed to get hpd gpio\n");

 if (!hdmi->hpd_gpiod)
  DBG("failed to get HPD gpio");

 if (hdmi->hpd_gpiod)
  gpiod_set_consumer_name(hdmi->hpd_gpiod, "HDMI_HPD");

 ret = msm_hdmi_get_phy(hdmi);
 if (ret) {
  DRM_DEV_ERROR(&pdev->dev, "failed to get phy\n");
  return ret;
 }

 ret = devm_pm_runtime_enable(&pdev->dev);
 if (ret)
  goto err_put_phy;

 platform_set_drvdata(pdev, hdmi);

 ret = component_add(&pdev->dev, &msm_hdmi_ops);
 if (ret)
  goto err_put_phy;

 return 0;

err_put_phy:
 msm_hdmi_put_phy(hdmi);
 return ret;
}

static void msm_hdmi_dev_remove(struct platform_device *pdev)
{
 struct hdmi *hdmi = dev_get_drvdata(&pdev->dev);

 component_del(&pdev->dev, &msm_hdmi_ops);

 msm_hdmi_put_phy(hdmi);
}

static int msm_hdmi_runtime_suspend(struct device *dev)
{
 struct hdmi *hdmi = dev_get_drvdata(dev);
 const struct hdmi_platform_config *config = hdmi->config;

 clk_bulk_disable_unprepare(config->pwr_clk_cnt, hdmi->pwr_clks);

 pinctrl_pm_select_sleep_state(dev);

 regulator_bulk_disable(config->pwr_reg_cnt, hdmi->pwr_regs);

 return 0;
}

static int msm_hdmi_runtime_resume(struct device *dev)
{
 struct hdmi *hdmi = dev_get_drvdata(dev);
 const struct hdmi_platform_config *config = hdmi->config;
 int ret;

 ret = regulator_bulk_enable(config->pwr_reg_cnt, hdmi->pwr_regs);
 if (ret)
  return ret;

 ret = pinctrl_pm_select_default_state(dev);
 if (ret)
  goto fail;

 ret = clk_bulk_prepare_enable(config->pwr_clk_cnt, hdmi->pwr_clks);
 if (ret)
  goto fail;

 return 0;

fail:
 pinctrl_pm_select_sleep_state(dev);

 return ret;
}

DEFINE_RUNTIME_DEV_PM_OPS(msm_hdmi_pm_ops, msm_hdmi_runtime_suspend, msm_hdmi_runtime_resume, NULL);

static const struct of_device_id msm_hdmi_dt_match[] = {
 { .compatible = "qcom,hdmi-tx-8998", .data = &hdmi_tx_8974_config },
 { .compatible = "qcom,hdmi-tx-8996", .data = &hdmi_tx_8974_config },
 { .compatible = "qcom,hdmi-tx-8994", .data = &hdmi_tx_8974_config },
 { .compatible = "qcom,hdmi-tx-8084", .data = &hdmi_tx_8974_config },
 { .compatible = "qcom,hdmi-tx-8974", .data = &hdmi_tx_8974_config },
 { .compatible = "qcom,hdmi-tx-8960", .data = &hdmi_tx_8960_config },
 { .compatible = "qcom,hdmi-tx-8660", .data = &hdmi_tx_8960_config },
 {}
};

static struct platform_driver msm_hdmi_driver = {
 .probe = msm_hdmi_dev_probe,
 .remove = msm_hdmi_dev_remove,
 .driver = {
  .name = "hdmi_msm",
  .of_match_table = msm_hdmi_dt_match,
  .pm = &msm_hdmi_pm_ops,
 },
};

void __init msm_hdmi_register(void)
{
 msm_hdmi_phy_driver_register();
 platform_driver_register(&msm_hdmi_driver);
}

void __exit msm_hdmi_unregister(void)
{
 platform_driver_unregister(&msm_hdmi_driver);
 msm_hdmi_phy_driver_unregister();
}