[PATCH 2/3] drm/rockchip: cdn-dp: Support HDMI codec plug-change callback

[Brian Norris]

Some audio servers like to monitor a jack device (perhaps combined with
EDID, for audio-presence info) to determine DP/HDMI audio presence.

Signed-off-by: Brian Norris <briannor...@chromium.org>
---

 drivers/gpu/drm/rockchip/cdn-dp-core.c | 28 ++++++++++++++++++++++++++
 drivers/gpu/drm/rockchip/cdn-dp-core.h |  4 ++++
 2 files changed, 32 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c 
b/drivers/gpu/drm/rockchip/cdn-dp-core.c
index 16497c31d9f9..edd6a1fc46cd 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-core.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c
@@ -586,6 +586,13 @@ static bool cdn_dp_check_link_status(struct cdn_dp_device 
*dp)
        return drm_dp_channel_eq_ok(link_status, min(port->lanes, sink_lanes));
 }
 
+static void cdn_dp_audio_handle_plugged_change(struct cdn_dp_device *dp,
+                                              bool plugged)
+{
+       if (dp->codec_dev)
+               dp->plugged_cb(dp->codec_dev, plugged);
+}
+
 static void cdn_dp_encoder_enable(struct drm_encoder *encoder)
 {
        struct cdn_dp_device *dp = encoder_to_dp(encoder);
@@ -641,6 +648,9 @@ static void cdn_dp_encoder_enable(struct drm_encoder 
*encoder)
                DRM_DEV_ERROR(dp->dev, "Failed to valid video %d\n", ret);
                goto out;
        }
+
+       cdn_dp_audio_handle_plugged_change(dp, true);
+
 out:
        mutex_unlock(&dp->lock);
 }
@@ -651,6 +661,8 @@ static void cdn_dp_encoder_disable(struct drm_encoder 
*encoder)
        int ret;
 
        mutex_lock(&dp->lock);
+       cdn_dp_audio_handle_plugged_change(dp, false);
+
        if (dp->active) {
                ret = cdn_dp_disable(dp);
                if (ret) {
@@ -846,11 +858,27 @@ static int cdn_dp_audio_get_eld(struct device *dev, void 
*data,
        return 0;
 }
 
+static int cdn_dp_audio_hook_plugged_cb(struct device *dev, void *data,
+                                       hdmi_codec_plugged_cb fn,
+                                       struct device *codec_dev)
+{
+       struct cdn_dp_device *dp = dev_get_drvdata(dev);
+
+       mutex_lock(&dp->lock);
+       dp->plugged_cb = fn;
+       dp->codec_dev = codec_dev;
+       cdn_dp_audio_handle_plugged_change(dp, dp->connected);
+       mutex_unlock(&dp->lock);
+
+       return 0;
+}
+
 static const struct hdmi_codec_ops audio_codec_ops = {
        .hw_params = cdn_dp_audio_hw_params,
        .audio_shutdown = cdn_dp_audio_shutdown,
        .mute_stream = cdn_dp_audio_mute_stream,
        .get_eld = cdn_dp_audio_get_eld,
+       .hook_plugged_cb = cdn_dp_audio_hook_plugged_cb,
        .no_capture_mute = 1,
 };
 
diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.h 
b/drivers/gpu/drm/rockchip/cdn-dp-core.h
index 81ac9b658a70..d808a9de45ed 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-core.h
+++ b/drivers/gpu/drm/rockchip/cdn-dp-core.h
@@ -10,6 +10,7 @@
 #include <drm/drm_dp_helper.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_probe_helper.h>
+#include <sound/hdmi-codec.h>
 
 #include "rockchip_drm_drv.h"
 
@@ -101,5 +102,8 @@ struct cdn_dp_device {
 
        u8 dpcd[DP_RECEIVER_CAP_SIZE];
        bool sink_has_audio;
+
+       hdmi_codec_plugged_cb plugged_cb;
+       struct device *codec_dev;
 };
 #endif  /* _CDN_DP_CORE_H */
-- 
2.34.1.703.g22d0c6ccf7-goog