[PATCH 3/7] drm/bridge/synopsys: dw-hdmi: Add HDMI notifier support

[Cheng-Yi Chiang]

Use hdmi-notifier to notify codec driver that there is HDMI plug/unplug
event.

Signed-off-by: Cheng-Yi Chiang <cychi...@chromium.org>
---
 drivers/gpu/drm/bridge/synopsys/Kconfig   |  1 +
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 28 +++++++++++++++++++++--
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/Kconfig 
b/drivers/gpu/drm/bridge/synopsys/Kconfig
index 3cc53b44186e..43192d9d7357 100644
--- a/drivers/gpu/drm/bridge/synopsys/Kconfig
+++ b/drivers/gpu/drm/bridge/synopsys/Kconfig
@@ -3,6 +3,7 @@ config DRM_DW_HDMI
        select DRM_KMS_HELPER
        select REGMAP_MMIO
        select CEC_CORE if CEC_NOTIFIER
+       select HDMI_NOTIFIERS
 
 config DRM_DW_HDMI_AHB_AUDIO
        tristate "Synopsys Designware AHB Audio interface"
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c 
b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index ab7968c8f6a2..53701921eb1f 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -17,6 +17,7 @@
 #include <linux/err.h>
 #include <linux/clk.h>
 #include <linux/hdmi.h>
+#include <linux/hdmi-notifier.h>
 #include <linux/mutex.h>
 #include <linux/of_device.h>
 #include <linux/regmap.h>
@@ -190,6 +191,7 @@ struct dw_hdmi {
        void (*disable_audio)(struct dw_hdmi *hdmi);
 
        struct cec_notifier *cec_notifier;
+       struct hdmi_notifier *hdmi_notifier;
 };
 
 #define HDMI_IH_PHY_STAT0_RX_SENSE \
@@ -2301,8 +2303,15 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
        }
 
        if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
-               dev_dbg(hdmi->dev, "EVENT=%s\n",
-                       phy_int_pol & HDMI_PHY_HPD ? "plugin" : "plugout");
+               if (phy_int_pol & HDMI_PHY_HPD) {
+                       dev_dbg(hdmi->dev, "EVENT=plugin\n");
+                       if (hdmi->hdmi_notifier)
+                               hdmi_event_connect(hdmi->hdmi_notifier);
+               } else {
+                       dev_dbg(hdmi->dev, "EVENT=plugout\n");
+                       if (hdmi->hdmi_notifier)
+                               hdmi_event_disconnect(hdmi->hdmi_notifier);
+               }
                if (hdmi->bridge.dev)
                        drm_helper_hpd_irq_event(hdmi->bridge.dev);
        }
@@ -2606,6 +2615,12 @@ __dw_hdmi_probe(struct platform_device *pdev,
                goto err_iahb;
        }
 
+       hdmi->hdmi_notifier = hdmi_notifier_get(dev);
+       if (!hdmi->hdmi_notifier) {
+               ret = -ENOMEM;
+               goto err_iahb;
+       }
+
        /*
         * To prevent overflows in HDMI_IH_FC_STAT2, set the clk regenerator
         * N and cts values before enabling phy
@@ -2696,6 +2711,9 @@ __dw_hdmi_probe(struct platform_device *pdev,
        if (hdmi->cec_notifier)
                cec_notifier_put(hdmi->cec_notifier);
 
+       if (hdmi->hdmi_notifier)
+               hdmi_notifier_put(hdmi->hdmi_notifier);
+
        clk_disable_unprepare(hdmi->iahb_clk);
        if (hdmi->cec_clk)
                clk_disable_unprepare(hdmi->cec_clk);
@@ -2709,6 +2727,9 @@ __dw_hdmi_probe(struct platform_device *pdev,
 
 static void __dw_hdmi_remove(struct dw_hdmi *hdmi)
 {
+       if (hdmi->hdmi_notifier)
+               hdmi_event_disconnect(hdmi->hdmi_notifier);
+
        if (hdmi->audio && !IS_ERR(hdmi->audio))
                platform_device_unregister(hdmi->audio);
        if (!IS_ERR(hdmi->cec))
@@ -2720,6 +2741,9 @@ static void __dw_hdmi_remove(struct dw_hdmi *hdmi)
        if (hdmi->cec_notifier)
                cec_notifier_put(hdmi->cec_notifier);
 
+       if (hdmi->hdmi_notifier)
+               hdmi_notifier_put(hdmi->hdmi_notifier);
+
        clk_disable_unprepare(hdmi->iahb_clk);
        clk_disable_unprepare(hdmi->isfr_clk);
        if (hdmi->cec_clk)
-- 
2.22.0.rc1.257.g3120a18244-goog