On Fri, Jul 5, 2019 at 1:45 PM Jonas Karlman <jonas@xxxxxxxxx> wrote: > > On 2019-07-05 06:26, Cheng-Yi Chiang wrote: > > 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. > > I have a similar notification need for making a snd_ctl_notify() call from hdmi-codec when ELD changes, > see [1] for work in progress patches (part of a dw-hdmi multi-channel lpcm series I am preparing). > > Any suggestions on how to handle a ELD change notification? > Should I use a similar pattern as in this series? Hi Jonas, I think we are using a very similar pattern. The difference is that in my series the function is not exposed on hdmi-codec.h. I think your method makes sense for your case because dw-hdmi-i2s-audio.c needs to access and update data inside dw_hdmi_i2s_audio_data, while in my use case it is only a thin layer setting up the callback for jack status. > (I lost track of the hdmi-notifier/drm_audio_component discussion) > It was a long discussion. I think the conclusion was that if we are only talking about hdmi-codec, then we just need to extend the ops exposed in hdmi-codec and don't need to use hdmi-notifier or drm_audio_component. > [1] https://github.com/Kwiboo/linux-rockchip/compare/54b40fdd264c7ed96017271eb6524cca4ff755ab...9c17284e8a8657e8b1da53a1c7ff056cbd8ce43c > > Best regards, > Jonas > > > > > Signed-off-by: Cheng-Yi Chiang <cychiang@xxxxxxxxxxxx> > > --- > > .../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 | 34 ++++++++++++++++++- > > 3 files changed, 46 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..c69a399fc7ca 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 +214,17 @@ static inline u8 hdmi_readb(struct dw_hdmi *hdmi, int offset) > > return val; > > } > > > > +static int hdmi_set_plugged_cb(struct dw_hdmi *hdmi, hdmi_codec_plugged_cb fn) > > +{ > > + mutex_lock(&hdmi->mutex); > > + hdmi->plugged_cb = fn; > > + if (hdmi->audio && !IS_ERR(hdmi->audio)) > > + fn(hdmi->audio, > > + hdmi->last_connector_result == connector_status_connected); > > + 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 +2060,7 @@ 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 +2068,20 @@ 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); > > + if (hdmi->plugged_cb && hdmi->audio && !IS_ERR(hdmi->audio)) { > > + hdmi->plugged_cb(hdmi->audio, > > + 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 +2490,7 @@ __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 +2684,7 @@ __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; > > > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
