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Subject[PATCH v3 2/5] drm: bridge: dw-hdmi: Report connector status using callback
Date
Allow codec driver register callback function for plug event.

The callback registration flow:
dw-hdmi <--- hw-hdmi-i2s-audio <--- hdmi-codec

dw-hdmi-i2s-audio implements hook_plugged_cb op
so codec driver can register the callback.

dw-hdmi implements set_plugged_cb op so platform device can register the
callback.

When connector plug/unplug event happens, report this event using the
callback.

Make sure that audio and drm are using the single source of truth for
connector status.

Signed-off-by: Cheng-Yi Chiang <cychiang@chromium.org>
---
.../gpu/drm/bridge/synopsys/dw-hdmi-audio.h | 3 +
.../drm/bridge/synopsys/dw-hdmi-i2s-audio.c | 10 ++++
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 55 ++++++++++++++++++-
3 files changed, 67 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h
index 63b5756f463b..f523c590984e 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h
@@ -2,6 +2,8 @@
#ifndef DW_HDMI_AUDIO_H
#define DW_HDMI_AUDIO_H

+#include <sound/hdmi-codec.h>
+
struct dw_hdmi;

struct dw_hdmi_audio_data {
@@ -17,6 +19,7 @@ struct dw_hdmi_i2s_audio_data {

void (*write)(struct dw_hdmi *hdmi, u8 val, int offset);
u8 (*read)(struct dw_hdmi *hdmi, int offset);
+ int (*set_plugged_cb)(struct dw_hdmi *hdmi, hdmi_codec_plugged_cb fn);
};

#endif
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
index 5cbb71a866d5..7b93cf05c985 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
@@ -104,10 +104,20 @@ static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
return -EINVAL;
}

+static int dw_hdmi_i2s_hook_plugged_cb(struct device *dev, void *data,
+ hdmi_codec_plugged_cb fn)
+{
+ struct dw_hdmi_i2s_audio_data *audio = data;
+ struct dw_hdmi *hdmi = audio->hdmi;
+
+ return audio->set_plugged_cb(hdmi, fn);
+}
+
static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
.hw_params = dw_hdmi_i2s_hw_params,
.audio_shutdown = dw_hdmi_i2s_audio_shutdown,
.get_dai_id = dw_hdmi_i2s_get_dai_id,
+ .hook_plugged_cb = dw_hdmi_i2s_hook_plugged_cb,
};

static int snd_dw_hdmi_probe(struct platform_device *pdev)
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 045b1b13fd0e..ce6646067472 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -26,6 +26,8 @@
#include <drm/drm_probe_helper.h>
#include <drm/bridge/dw_hdmi.h>

+#include <sound/hdmi-codec.h>
+
#include <uapi/linux/media-bus-format.h>
#include <uapi/linux/videodev2.h>

@@ -185,6 +187,9 @@ struct dw_hdmi {
void (*disable_audio)(struct dw_hdmi *hdmi);

struct cec_notifier *cec_notifier;
+
+ hdmi_codec_plugged_cb plugged_cb;
+ enum drm_connector_status last_connector_result;
};

#define HDMI_IH_PHY_STAT0_RX_SENSE \
@@ -209,6 +214,40 @@ static inline u8 hdmi_readb(struct dw_hdmi *hdmi, int offset)
return val;
}

+static void handle_plugged_change(struct dw_hdmi *hdmi, bool plugged)
+{
+ struct platform_device *codec_pdev;
+
+ if (!hdmi->audio || IS_ERR(hdmi->audio))
+ return;
+ codec_pdev = platform_get_drvdata(hdmi->audio);
+ if (!codec_pdev || IS_ERR(codec_pdev))
+ return;
+ if (!hdmi->plugged_cb)
+ return;
+
+ hdmi->plugged_cb(&codec_pdev->dev, plugged);
+}
+
+static int hdmi_set_plugged_cb(struct dw_hdmi *hdmi, hdmi_codec_plugged_cb fn)
+{
+ bool plugged;
+ struct platform_device *codec_pdev;
+
+ if (!hdmi->audio || IS_ERR(hdmi->audio))
+ return -EINVAL;
+ codec_pdev = platform_get_drvdata(hdmi->audio);
+ if (!codec_pdev || IS_ERR(codec_pdev))
+ return -EINVAL;
+
+ mutex_lock(&hdmi->mutex);
+ hdmi->plugged_cb = fn;
+ plugged = hdmi->last_connector_result == connector_status_connected;
+ handle_plugged_change(hdmi, plugged);
+ mutex_unlock(&hdmi->mutex);
+ return 0;
+}
+
static void hdmi_modb(struct dw_hdmi *hdmi, u8 data, u8 mask, unsigned reg)
{
regmap_update_bits(hdmi->regm, reg << hdmi->reg_shift, mask, data);
@@ -2044,6 +2083,7 @@ dw_hdmi_connector_detect(struct drm_connector *connector, bool force)
{
struct dw_hdmi *hdmi = container_of(connector, struct dw_hdmi,
connector);
+ enum drm_connector_status result;

mutex_lock(&hdmi->mutex);
hdmi->force = DRM_FORCE_UNSPECIFIED;
@@ -2051,7 +2091,18 @@ dw_hdmi_connector_detect(struct drm_connector *connector, bool force)
dw_hdmi_update_phy_mask(hdmi);
mutex_unlock(&hdmi->mutex);

- return hdmi->phy.ops->read_hpd(hdmi, hdmi->phy.data);
+ result = hdmi->phy.ops->read_hpd(hdmi, hdmi->phy.data);
+
+ mutex_lock(&hdmi->mutex);
+ if (result != hdmi->last_connector_result) {
+ dev_dbg(hdmi->dev, "read_hpd result: %d", result);
+ handle_plugged_change(hdmi,
+ result == connector_status_connected);
+ hdmi->last_connector_result = result;
+ }
+ mutex_unlock(&hdmi->mutex);
+
+ return result;
}

static int dw_hdmi_connector_get_modes(struct drm_connector *connector)
@@ -2460,6 +2511,7 @@ __dw_hdmi_probe(struct platform_device *pdev,
hdmi->rxsense = true;
hdmi->phy_mask = (u8)~(HDMI_PHY_HPD | HDMI_PHY_RX_SENSE);
hdmi->mc_clkdis = 0x7f;
+ hdmi->last_connector_result = connector_status_disconnected;

mutex_init(&hdmi->mutex);
mutex_init(&hdmi->audio_mutex);
@@ -2653,6 +2705,7 @@ __dw_hdmi_probe(struct platform_device *pdev,
audio.hdmi = hdmi;
audio.write = hdmi_writeb;
audio.read = hdmi_readb;
+ audio.set_plugged_cb = hdmi_set_plugged_cb;
hdmi->enable_audio = dw_hdmi_i2s_audio_enable;
hdmi->disable_audio = dw_hdmi_i2s_audio_disable;

--
2.22.0.510.g264f2c817a-goog
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