[PATCH 2/4] exynos_hdmi: add HDMI notifier support

[Hans Verkuil]

From: Hans Verkuil <hans.verk...@cisco.com>

Implement the HDMI notifier support to allow CEC drivers to
be informed when there is a new EDID and when a connect or
disconnect happens.

Signed-off-by: Hans Verkuil <hans.verkuil at cisco.com>
---
 drivers/gpu/drm/exynos/Kconfig       |  1 +
 drivers/gpu/drm/exynos/exynos_hdmi.c | 24 +++++++++++++++++++++---
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig
index 465d344f..34f3b6f 100644
--- a/drivers/gpu/drm/exynos/Kconfig
+++ b/drivers/gpu/drm/exynos/Kconfig
@@ -77,6 +77,7 @@ config DRM_EXYNOS_DP
 config DRM_EXYNOS_HDMI
        bool "HDMI"
        depends on DRM_EXYNOS_MIXER || DRM_EXYNOS5433_DECON
+       select HDMI_NOTIFIERS
        help
          Choose this option if you want to use Exynos HDMI for DRM.

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c 
b/drivers/gpu/drm/exynos/exynos_hdmi.c
index e8fb6ef..2bfc411 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -31,6 +31,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/clk.h>
 #include <linux/gpio/consumer.h>
+#include <linux/hdmi-notifier.h>
 #include <linux/regulator/consumer.h>
 #include <linux/io.h>
 #include <linux/of_address.h>
@@ -132,6 +133,7 @@ struct hdmi_context {
        struct delayed_work             hotplug_work;
        struct drm_display_mode         current_mode;
        u8                              cea_video_id;
+       struct hdmi_notifier            *notifier;
        const struct hdmi_driver_data   *drv_data;

        void __iomem                    *regs;
@@ -857,9 +859,12 @@ static enum drm_connector_status hdmi_detect(struct 
drm_connector *connector,
 {
        struct hdmi_context *hdata = connector_to_hdmi(connector);

-       if (gpiod_get_value(hdata->hpd_gpio))
+       if (gpiod_get_value(hdata->hpd_gpio)) {
+               hdmi_event_connect(hdata->notifier);
                return connector_status_connected;
+       }

+       hdmi_event_disconnect(hdata->notifier);
        return connector_status_disconnected;
 }

@@ -898,6 +903,9 @@ static int hdmi_get_modes(struct drm_connector *connector)
                edid->width_cm, edid->height_cm);

        drm_mode_connector_update_edid_property(connector, edid);
+       hdmi_event_connect(hdata->notifier);
+       hdmi_event_new_edid(hdata->notifier, edid,
+                           EDID_LENGTH * (1 + edid->extensions));

        ret = drm_add_edid_modes(connector, edid);

@@ -1544,6 +1552,7 @@ static void hdmi_disable(struct drm_encoder *encoder)
        if (funcs && funcs->disable)
                (*funcs->disable)(crtc);

+       hdmi_event_disconnect(hdata->notifier);
        cancel_delayed_work(&hdata->hotplug_work);

        hdmiphy_disable(hdata);
@@ -1893,15 +1902,22 @@ static int hdmi_probe(struct platform_device *pdev)
                }
        }

+       hdata->notifier = hdmi_notifier_get(&pdev->dev);
+       if (hdata->notifier == NULL) {
+               ret = -ENOMEM;
+               goto err_hdmiphy;
+       }
+
        pm_runtime_enable(dev);

        ret = component_add(&pdev->dev, &hdmi_component_ops);
        if (ret)
-               goto err_disable_pm_runtime;
+               goto err_notifier_put;

        return ret;

-err_disable_pm_runtime:
+err_notifier_put:
+       hdmi_notifier_put(hdata->notifier);
        pm_runtime_disable(dev);

 err_hdmiphy:
@@ -1918,9 +1934,11 @@ static int hdmi_remove(struct platform_device *pdev)
        struct hdmi_context *hdata = platform_get_drvdata(pdev);

        cancel_delayed_work_sync(&hdata->hotplug_work);
+       hdmi_event_disconnect(hdata->notifier);

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

+       hdmi_notifier_put(hdata->notifier);
        pm_runtime_disable(&pdev->dev);

        if (!IS_ERR(hdata->reg_hdmi_en))
-- 
2.10.2