On Fri, Dec 04, 2015 at 06:12:46PM +0100, Takashi Iwai wrote:
> Implement a new i915_audio_component_ops, get_eld(). It's called by
> the audio driver to fetch the current audio status and ELD of the
> given HDMI/DP port. It returns the size of expected ELD bytes if it's
> valid, zero if no valid ELD is found, or a negative error code. The
> current state of audio on/off is stored in the given pointer, too.
>
> Note that the returned size isn't limited to the given max bytes. If
> the size is greater than the max bytes, it means that only a part of
> ELD has been copied back.
>
> For achieving this implementation, a new field audio_connector is
> added to struct intel_digital_port. It points to the connector
> assigned to the given digital port. It's set/reset at each audio
> enable/disable call in intel_audio.c, and protected with av_mutex.
>
> Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
> ---
> v2->v3:
> * Track drm_connector for easier ELD retrieval, remove superfluous
> audio_enabled flag instead
> * Back to av_mutex
> * Rebase to drm-next, update get_eld documentation for new kernel doc
>
> drivers/gpu/drm/i915/intel_audio.c | 42 ++++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_drv.h | 2 ++
> include/drm/i915_component.h | 14 +++++++++++++
> 3 files changed, 58 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
> index 9aa83e71b792..eeac9f763110 100644
> --- a/drivers/gpu/drm/i915/intel_audio.c
> +++ b/drivers/gpu/drm/i915/intel_audio.c
> @@ -521,6 +521,10 @@ void intel_audio_codec_enable(struct intel_encoder *intel_encoder)
> dev_priv->display.audio_codec_enable(connector, intel_encoder,
> adjusted_mode);
>
> + mutex_lock(&dev_priv->av_mutex);
> + intel_dig_port->audio_connector = connector;
This still has the problem that the eld might get ovewritten while we're
only holding av_mutex below. But I think that can/should be solved as part
of my probe vs. modeset locking rework.
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> + mutex_unlock(&dev_priv->av_mutex);
> +
> if (acomp && acomp->audio_ops && acomp->audio_ops->pin_eld_notify)
> acomp->audio_ops->pin_eld_notify(acomp->audio_ops->audio_ptr, (int) port);
> }
> @@ -544,6 +548,10 @@ void intel_audio_codec_disable(struct intel_encoder *intel_encoder)
> if (dev_priv->display.audio_codec_disable)
> dev_priv->display.audio_codec_disable(intel_encoder);
>
> + mutex_lock(&dev_priv->av_mutex);
> + intel_dig_port->audio_connector = NULL;
> + mutex_unlock(&dev_priv->av_mutex);
> +
> if (acomp && acomp->audio_ops && acomp->audio_ops->pin_eld_notify)
> acomp->audio_ops->pin_eld_notify(acomp->audio_ops->audio_ptr, (int) port);
> }
> @@ -703,6 +711,39 @@ static int i915_audio_component_sync_audio_rate(struct device *dev,
> return 0;
> }
>
> +static int i915_audio_component_get_eld(struct device *dev, int port,
> + bool *enabled,
> + unsigned char *buf, int max_bytes)
> +{
> + struct drm_i915_private *dev_priv = dev_to_i915(dev);
> + struct drm_device *drm_dev = dev_priv->dev;
> + struct intel_encoder *intel_encoder;
> + struct intel_digital_port *intel_dig_port;
> + const u8 *eld;
> + int ret = -EINVAL;
> +
> + mutex_lock(&dev_priv->av_mutex);
> + for_each_intel_encoder(drm_dev, intel_encoder) {
> + if (intel_encoder->type != INTEL_OUTPUT_DISPLAYPORT &&
> + intel_encoder->type != INTEL_OUTPUT_HDMI)
> + continue;
> + intel_dig_port = enc_to_dig_port(&intel_encoder->base);
> + if (port == intel_dig_port->port) {
> + ret = 0;
> + *enabled = intel_dig_port->audio_connector != NULL;
> + if (!*enabled)
> + break;
> + eld = intel_dig_port->audio_connector->eld;
> + ret = drm_eld_size(eld);
> + memcpy(buf, eld, min(max_bytes, ret));
> + break;
> + }
> + }
> +
> + mutex_unlock(&dev_priv->av_mutex);
> + return ret;
> +}
> +
> static const struct i915_audio_component_ops i915_audio_component_ops = {
> .owner = THIS_MODULE,
> .get_power = i915_audio_component_get_power,
> @@ -710,6 +751,7 @@ static const struct i915_audio_component_ops i915_audio_component_ops = {
> .codec_wake_override = i915_audio_component_codec_wake_override,
> .get_cdclk_freq = i915_audio_component_get_cdclk_freq,
> .sync_audio_rate = i915_audio_component_sync_audio_rate,
> + .get_eld = i915_audio_component_get_eld,
> };
>
> static int i915_audio_component_bind(struct device *i915_dev,
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index ab5c147fa9e9..fe58a5722b16 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -814,6 +814,8 @@ struct intel_digital_port {
> struct intel_hdmi hdmi;
> enum irqreturn (*hpd_pulse)(struct intel_digital_port *, bool);
> bool release_cl2_override;
> + /* for communication with audio component; protected by av_mutex */
> + const struct drm_connector *audio_connector;
> };
>
> struct intel_dp_mst_encoder {
> diff --git a/include/drm/i915_component.h b/include/drm/i915_component.h
> index fab13851f95a..b46fa0ef3005 100644
> --- a/include/drm/i915_component.h
> +++ b/include/drm/i915_component.h
> @@ -65,6 +65,20 @@ struct i915_audio_component_ops {
> * sample rate, it will call this function to set n/cts
> */
> int (*sync_audio_rate)(struct device *, int port, int rate);
> + /**
> + * @get_eld: fill the audio state and ELD bytes for the given port
> + *
> + * Called from audio driver to get the HDMI/DP audio state of the given
> + * digital port, and also fetch ELD bytes to the given pointer.
> + *
> + * It returns the byte size of the original ELD (not the actually
> + * copied size), zero for an invalid ELD, or a negative error code.
> + *
> + * Note that the returned size may be over @max_bytes. Then it
> + * implies that only a part of ELD has been copied to the buffer.
> + */
> + int (*get_eld)(struct device *, int port, bool *enabled,
> + unsigned char *buf, int max_bytes);
> };
>
> /**
> --
> 2.6.3
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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