Re: [PATCH v8 20/27] drm/connector: hdmi: Add Infoframes generation

[Alexander Stein <alexander.stein@ew.tq-group.com>]

Hi Maxime,

Am Donnerstag, 7. März 2024, 14:38:47 CET schrieb Maxime Ripard:
> Infoframes in KMS is usually handled by a bunch of low-level helpers
> that require quite some boilerplate for drivers. This leads to
> discrepancies with how drivers generate them, and which are actually
> sent.
> 
> Now that we have everything needed to generate them in the HDMI
> connector state, we can generate them in our common logic so that
> drivers can simply reuse what we precomputed.
> 
> Signed-off-by: Maxime Ripard <mripard@kernel.org>
> ---
>  drivers/gpu/drm/Kconfig                            |   1 +
>  drivers/gpu/drm/drm_atomic_state_helper.c          | 327 +++++++++++++++++++++
>  drivers/gpu/drm/drm_connector.c                    |  14 +
>  .../gpu/drm/tests/drm_atomic_state_helper_test.c   |   1 +
>  drivers/gpu/drm/tests/drm_connector_test.c         |  12 +
>  include/drm/drm_atomic_state_helper.h              |   8 +
>  include/drm/drm_connector.h                        | 133 +++++++++
>  7 files changed, 496 insertions(+)
> 
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index 872edb47bb53..ad9c467e20ce 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -97,10 +97,11 @@ config DRM_KUNIT_TEST
>  	  If in doubt, say "N".
>  
>  config DRM_KMS_HELPER
>  	tristate
>  	depends on DRM
> +	select DRM_DISPLAY_HDMI_HELPER
>  	help
>  	  CRTC helpers for KMS drivers.
>  
>  config DRM_DEBUG_DP_MST_TOPOLOGY_REFS
>          bool "Enable refcount backtrace history in the DP MST helpers"
> diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
> index e66272c0d006..46d9fd2ea8fa 100644
> --- a/drivers/gpu/drm/drm_atomic_state_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_state_helper.c
> [snip]
> @@ -958,10 +1100,195 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
>  
>  	return 0;
>  }
>  EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_check);
>  
> +#define HDMI_MAX_INFOFRAME_SIZE		29
> +
> +static int clear_device_infoframe(struct drm_connector *connector,
> +				  enum hdmi_infoframe_type type)
> +{
> +	const struct drm_connector_hdmi_funcs *funcs = connector->hdmi.funcs;
> +
> +	if (!funcs || !funcs->clear_infoframe)
> +		return 0;
> +
> +	return funcs->clear_infoframe(connector, type);
> +}
> +
> +static int clear_infoframe(struct drm_connector *connector,
> +			   struct drm_connector_hdmi_infoframe *conn_frame,
> +			   struct drm_connector_hdmi_infoframe *old_frame)
> +{
> +	int ret;
> +
> +	ret = clear_device_infoframe(connector, old_frame->data.any.type);
> +	if (ret)
> +		return ret;
> +
> +	memset(old_frame, 0, sizeof(*old_frame));
> +
> +	return 0;
> +}
> +
> +static int write_device_infoframe(struct drm_connector *connector,
> +				  union hdmi_infoframe *frame)
> +{
> +	const struct drm_connector_hdmi_funcs *funcs = connector->hdmi.funcs;
> +	u8 buffer[HDMI_MAX_INFOFRAME_SIZE];
> +	int len;
> +
> +	if (!funcs || !funcs->write_infoframe)
> +		return -ENOSYS;
> +
> +	len = hdmi_infoframe_pack(frame, buffer, sizeof(buffer));
> +	if (len < 0)
> +		return len;
> +
> +	return funcs->write_infoframe(connector, frame->any.type, buffer, len);
> +}
> +
> +static int write_infoframe(struct drm_connector *connector,
> +			   struct drm_connector_hdmi_infoframe *conn_frame,
> +			   struct drm_connector_hdmi_infoframe *new_frame)
> +{
> +	int ret;
> +
> +	ret = write_device_infoframe(connector, &new_frame->data);
> +	if (ret)
> +		return ret;
> +
> +	if (conn_frame)
> +		memcpy(conn_frame, new_frame, sizeof(*conn_frame));
> +
> +	return 0;
> +}
> +
> +static int write_or_clear_infoframe(struct drm_connector *connector,
> +				    struct drm_connector_hdmi_infoframe *conn_frame,
> +				    struct drm_connector_hdmi_infoframe *old_frame,
> +				    struct drm_connector_hdmi_infoframe *new_frame)
> +{
> +	if (new_frame->set)
> +		return write_infoframe(connector, conn_frame, new_frame);
> +
> +	if (old_frame->set && !new_frame->set)
> +		return clear_infoframe(connector, conn_frame, old_frame);
> +
> +	return 0;
> +}
> +
> +#define UPDATE_INFOFRAME(c, os, ns, i)				\
> +	write_or_clear_infoframe(c,				\
> +				 &(c)->hdmi.infoframes.i,	\
> +				 &(os)->hdmi.infoframes.i,	\
> +				 &(ns)->hdmi.infoframes.i)
> +
> +/**
> + * drm_atomic_helper_connector_hdmi_update_infoframes - Update the Infoframes
> + * @connector: A pointer to the HDMI connector
> + * @state: The HDMI connector state to generate the infoframe from
> + *
> + * This function is meant for HDMI connector drivers to write their
> + * infoframes. It will typically be used in a
> + * @drm_connector_helper_funcs.atomic_enable implementation.
> + *
> + * Returns:
> + * Zero on success, error code on failure.
> + */
> +int drm_atomic_helper_connector_hdmi_update_infoframes(struct drm_connector *connector,
> +						       struct drm_atomic_state *state)
> +{
> +	struct drm_connector_state *old_state =
> +		drm_atomic_get_old_connector_state(state, connector);
> +	struct drm_connector_state *new_state =
> +		drm_atomic_get_new_connector_state(state, connector);
> +	struct drm_display_info *info = &connector->display_info;
> +	int ret;
> +
> +	if (!info->is_hdmi)
> +		return 0;
> +
> +	if (!info->has_hdmi_infoframe)
> +		return 0;
> +
> +	mutex_lock(&connector->hdmi.infoframes.lock);
> +
> +	ret = UPDATE_INFOFRAME(connector, old_state, new_state, avi);
> +	if (ret)
> +		goto out;
> +
> +	if (connector->hdmi.infoframes.audio.set) {
> +		ret = write_infoframe(connector,
> +				      NULL,
> +				      &connector->hdmi.infoframes.audio);
> +		if (ret)
> +			goto out;
> +	}
> +
> +	ret = UPDATE_INFOFRAME(connector, old_state, new_state, hdr_drm);
> +	if (ret)
> +		goto out;
> +
> +	ret = UPDATE_INFOFRAME(connector, old_state, new_state, spd);
> +	if (ret)
> +		goto out;
> +
> +	ret = UPDATE_INFOFRAME(connector, old_state, new_state, hdmi);
> +	if (ret)
> +		goto out;
> +
> +out:
> +	mutex_unlock(&connector->hdmi.infoframes.lock);
> +	return ret;
> +}
> +EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_update_infoframes);
> +
> +#undef UPDATE_INFOFRAME
> +#undef UPDATE_INFOFRAME_TOGGLE

UPDATE_INFOFRAME_TOGGLE seems to never be defined.

Best regards,
Alexadner

> +
> +/**
> + * drm_atomic_helper_connector_hdmi_update_audio_infoframe - Update the Audio Infoframe
> + * @connector: A pointer to the HDMI connector
> + * @frame: A pointer to the audio infoframe to write
> + *
> + * This function is meant for HDMI connector drivers to update their
> + * audio infoframe. It will typically be used in one of the ALSA hooks
> + * (most likely prepare).
> + *
> + * Returns:
> + * Zero on success, error code on failure.
> + */
> +int
> +drm_atomic_helper_connector_hdmi_update_audio_infoframe(struct drm_connector *connector,
> +							struct hdmi_audio_infoframe *frame)
> +{
> +	struct drm_connector_hdmi_infoframe infoframe = {};
> +	struct drm_display_info *info = &connector->display_info;
> +	int ret;
> +
> +	if (!info->is_hdmi)
> +		return 0;
> +
> +	if (!info->has_hdmi_infoframe)
> +		return 0;
> +
> +	memcpy(&infoframe.data, frame, sizeof(infoframe.data));
> +	infoframe.set = true;
> +
> +	mutex_lock(&connector->hdmi.infoframes.lock);
> +
> +	ret = write_infoframe(connector,
> +			      &connector->hdmi.infoframes.audio,
> +			      &infoframe);
> +
> +	mutex_unlock(&connector->hdmi.infoframes.lock);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_update_audio_infoframe);
> +
>  /**
>   * __drm_atomic_helper_connector_duplicate_state - copy atomic connector state
>   * @connector: connector object
>   * @state: atomic connector state
>   *
> [snip]

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