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drm: bridge: dw-hdmi: Report connector status using callback 

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 exports a function dw_hdmi_set_plugged_cb 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>
Link: https://lore.kernel.org/r/20191028071930.145899-2-cychiang@chromium.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Cheng-Yi Chiang 2019-10-28 15:19:25 +08:00 committed by Shengjiu Wang
parent 4dd0357e1c
commit 4804eeb4b6
3 changed files with 55 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
View File

@ -151,11 +151,22 @@ 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 device *codec_dev)
{
struct dw_hdmi_i2s_audio_data *audio = data;
struct dw_hdmi *hdmi = audio->hdmi;
return dw_hdmi_set_plugged_cb(hdmi, fn, codec_dev);
}
static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
.hw_params = dw_hdmi_i2s_hw_params,
.audio_shutdown = dw_hdmi_i2s_audio_shutdown,
.get_eld = dw_hdmi_i2s_get_eld,
.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)

41
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
View File

@ -193,6 +193,10 @@ struct dw_hdmi {
struct mutex cec_notifier_mutex;
struct cec_notifier *cec_notifier;
hdmi_codec_plugged_cb plugged_cb;
struct device *codec_dev;
enum drm_connector_status last_connector_result;
};
#define HDMI_IH_PHY_STAT0_RX_SENSE \
@ -217,6 +221,28 @@ static inline u8 hdmi_readb(struct dw_hdmi *hdmi, int offset)
return val;
}
static void handle_plugged_change(struct dw_hdmi *hdmi, bool plugged)
{
if (hdmi->plugged_cb && hdmi->codec_dev)
hdmi->plugged_cb(hdmi->codec_dev, plugged);
}
int dw_hdmi_set_plugged_cb(struct dw_hdmi *hdmi, hdmi_codec_plugged_cb fn,
struct device *codec_dev)
{
bool plugged;
mutex_lock(&hdmi->mutex);
hdmi->plugged_cb = fn;
hdmi->codec_dev = codec_dev;
plugged = hdmi->last_connector_result == connector_status_connected;
handle_plugged_change(hdmi, plugged);
mutex_unlock(&hdmi->mutex);
return 0;
}
EXPORT_SYMBOL_GPL(dw_hdmi_set_plugged_cb);
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);
@ -2279,6 +2305,7 @@ 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;
@ -2286,7 +2313,18 @@ 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)
@ -2738,6 +2776,7 @@ __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);

4
include/drm/bridge/dw_hdmi.h
View File

@ -6,6 +6,8 @@
#ifndef __DW_HDMI__
#define __DW_HDMI__
#include <sound/hdmi-codec.h>
struct drm_connector;
struct drm_display_mode;
struct drm_encoder;
@ -156,6 +158,8 @@ void dw_hdmi_resume(struct dw_hdmi *hdmi);
void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense);
int dw_hdmi_set_plugged_cb(struct dw_hdmi *hdmi, hdmi_codec_plugged_cb fn,
struct device *codec_dev);
void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt);
void dw_hdmi_set_channel_allocation(struct dw_hdmi *hdmi, unsigned int ca);