[v7,25/36] drm/connector: hdmi: Add Infoframes generation

  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                    |  16 +
 .../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, 498 insertions(+)
  

On Thu, 22 Feb 2024 at 20:16, Maxime Ripard <mripard@kernel.org> wrote:
>
> 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                    |  16 +
>  .../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, 498 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
> @@ -99,6 +99,7 @@ config DRM_KUNIT_TEST
>  config DRM_KMS_HELPER
>         tristate
>         depends on DRM
> +       select DRM_DISPLAY_HDMI_HELPER
>         help
>           CRTC helpers for KMS drivers.
>
> 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
> @@ -38,6 +38,8 @@
>  #include <drm/drm_vblank.h>
>  #include <drm/drm_writeback.h>
>
> +#include <drm/display/drm_hdmi_helper.h>
> +
>  #include <linux/slab.h>
>  #include <linux/dma-fence.h>
>
> @@ -914,6 +916,142 @@ hdmi_compute_config(const struct drm_connector *connector,
>         return -EINVAL;
>  }
>
> +static int hdmi_generate_avi_infoframe(const struct drm_connector *connector,
> +                                      struct drm_connector_state *state)
> +{
> +       const struct drm_display_mode *mode =
> +               connector_state_get_mode(state);
> +       struct drm_connector_hdmi_infoframe *infoframe =
> +               &state->hdmi.infoframes.avi;
> +       struct hdmi_avi_infoframe *frame =
> +               &infoframe->data.avi;
> +       bool is_full_range = state->hdmi.is_full_range;
> +       enum hdmi_quantization_range rgb_quant_range =
> +               is_full_range ? HDMI_QUANTIZATION_RANGE_FULL : HDMI_QUANTIZATION_RANGE_LIMITED;
> +       int ret;
> +
> +       ret = drm_hdmi_avi_infoframe_from_display_mode(frame, connector, mode);
> +       if (ret)
> +               return ret;
> +
> +       frame->colorspace = state->hdmi.output_format;
> +
> +       drm_hdmi_avi_infoframe_quant_range(frame, connector, mode, rgb_quant_range);
> +       drm_hdmi_avi_infoframe_colorimetry(frame, state);
> +       drm_hdmi_avi_infoframe_bars(frame, state);
> +
> +       infoframe->set = true;
> +
> +       return 0;
> +}
> +
> +static int hdmi_generate_spd_infoframe(const struct drm_connector *connector,
> +                                      struct drm_connector_state *state)
> +{
> +       struct drm_connector_hdmi_infoframe *infoframe =
> +               &state->hdmi.infoframes.spd;
> +       struct hdmi_spd_infoframe *frame =
> +               &infoframe->data.spd;
> +       int ret;
> +
> +       ret = hdmi_spd_infoframe_init(frame,
> +                                     connector->hdmi.vendor,
> +                                     connector->hdmi.product);
> +       if (ret)
> +               return ret;
> +
> +       frame->sdi = HDMI_SPD_SDI_PC;
> +
> +       infoframe->set = true;
> +
> +       return 0;
> +}
> +
> +static int hdmi_generate_hdr_infoframe(const struct drm_connector *connector,
> +                                      struct drm_connector_state *state)
> +{
> +       struct drm_connector_hdmi_infoframe *infoframe =
> +               &state->hdmi.infoframes.hdr_drm;
> +       struct hdmi_drm_infoframe *frame =
> +               &infoframe->data.drm;
> +       int ret;
> +
> +       if (connector->max_bpc < 10)
> +               return 0;
> +
> +       if (!state->hdr_output_metadata)
> +               return 0;
> +
> +       ret = drm_hdmi_infoframe_set_hdr_metadata(frame, state);
> +       if (ret)
> +               return ret;
> +
> +       infoframe->set = true;
> +
> +       return 0;
> +}
> +
> +static int hdmi_generate_hdmi_vendor_infoframe(const struct drm_connector *connector,
> +                                              struct drm_connector_state *state)
> +{
> +       const struct drm_display_mode *mode =
> +               connector_state_get_mode(state);
> +       struct drm_connector_hdmi_infoframe *infoframe =
> +               &state->hdmi.infoframes.hdmi;
> +       struct hdmi_vendor_infoframe *frame =
> +               &infoframe->data.vendor.hdmi;
> +       int ret;
> +
> +       ret = drm_hdmi_vendor_infoframe_from_display_mode(frame, connector, mode);
> +       if (ret) {
> +               if (ret == -EINVAL)
> +                       return 0;
> +
> +               return ret;
> +       }
> +
> +       infoframe->set = true;
> +
> +       return 0;
> +}
> +
> +static int
> +hdmi_generate_infoframes(const struct drm_connector *connector,
> +                        struct drm_connector_state *state)
> +{
> +       const struct drm_display_info *info = &connector->display_info;
> +       int ret;
> +
> +       if (!info->is_hdmi)
> +               return 0;
> +
> +       if (!info->has_hdmi_infoframe)
> +               return 0;
> +
> +       ret = hdmi_generate_avi_infoframe(connector, state);
> +       if (ret)
> +               return ret;
> +
> +       ret = hdmi_generate_spd_infoframe(connector, state);
> +       if (ret)
> +               return ret;
> +
> +       /*
> +        * Audio Infoframes will be generated by ALSA, and updated by
> +        * drm_atomic_helper_connector_hdmi_update_audio_infoframe().
> +        */
> +
> +       ret = hdmi_generate_hdr_infoframe(connector, state);
> +       if (ret)
> +               return ret;
> +
> +       ret = hdmi_generate_hdmi_vendor_infoframe(connector, state);
> +       if (ret)
> +               return ret;
> +
> +       return 0;
> +}
> +
>  /**
>   * drm_atomic_helper_connector_hdmi_check() - Helper to check HDMI connector atomic state
>   * @connector: DRM Connector
> @@ -943,6 +1081,10 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
>         if (ret)
>                 return ret;
>
> +       ret = hdmi_generate_infoframes(connector, new_state);
> +       if (ret)
> +               return ret;
> +
>         if (old_state->hdmi.broadcast_rgb != new_state->hdmi.broadcast_rgb ||
>             old_state->hdmi.output_bpc != new_state->hdmi.output_bpc ||
>             old_state->hdmi.output_format != new_state->hdmi.output_format) {
> @@ -960,6 +1102,191 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
>  }
>  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
> +
> +/**
> + * 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
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 6ffe59d01698..6cfc301096ef 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -456,6 +456,8 @@ EXPORT_SYMBOL(drmm_connector_init);
>   * drmm_connector_hdmi_init - Init a preallocated HDMI connector
>   * @dev: DRM device
>   * @connector: A pointer to the HDMI connector to init
> + * @vendor: HDMI Controller Vendor name
> + * @product: HDMI Controller Product name
>   * @funcs: callbacks for this connector
>   * @hdmi_funcs: HDMI-related callbacks for this connector
>   * @connector_type: user visible type of the connector
> @@ -476,6 +478,7 @@ EXPORT_SYMBOL(drmm_connector_init);
>   */
>  int drmm_connector_hdmi_init(struct drm_device *dev,
>                              struct drm_connector *connector,
> +                            const char *vendor, const char *product,
>                              const struct drm_connector_funcs *funcs,
>                              const struct drm_connector_hdmi_funcs *hdmi_funcs,
>                              int connector_type,
> @@ -485,6 +488,13 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
>  {
>         int ret;
>
> +       if (!vendor || !product)
> +               return -EINVAL;
> +
> +       if ((strlen(vendor) > DRM_CONNECTOR_HDMI_VENDOR_LEN) ||
> +           (strlen(product) > DRM_CONNECTOR_HDMI_PRODUCT_LEN))
> +               return -EINVAL;
> +
>         if (!(connector_type == DRM_MODE_CONNECTOR_HDMIA ||
>               connector_type == DRM_MODE_CONNECTOR_HDMIB))
>                 return -EINVAL;
> @@ -500,6 +510,12 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
>                 return ret;
>
>         connector->hdmi.supported_formats = supported_formats;
> +       strtomem_pad(connector->hdmi.vendor, vendor, 0);
> +       strtomem_pad(connector->hdmi.product, product, 0);
> +
> +       ret = drmm_mutex_init(dev, &connector->hdmi.infoframes.lock);

I'd suggest moving this call to the generic __drm_connector_init().
This way no matter how the rest of the drm code (mis)uses the
connector, the lock is always present and valid.

> +       if (ret)
> +               return ret;
>
>         /*
>          * drm_connector_attach_max_bpc_property() requires the
> diff --git a/drivers/gpu/drm/tests/drm_atomic_state_helper_test.c b/drivers/gpu/drm/tests/drm_atomic_state_helper_test.c
> index dcc0f7486f49..b28409fe65dd 100644
> --- a/drivers/gpu/drm/tests/drm_atomic_state_helper_test.c
> +++ b/drivers/gpu/drm/tests/drm_atomic_state_helper_test.c
> @@ -203,6 +203,7 @@ drm_atomic_helper_connector_hdmi_init(struct kunit *test,
>
>         conn = &priv->connector;
>         ret = drmm_connector_hdmi_init(drm, conn,
> +                                      "Vendor", "Product",
>                                        &dummy_connector_funcs,
>                                        &dummy_connector_hdmi_funcs,
>                                        DRM_MODE_CONNECTOR_HDMIA,
> diff --git a/drivers/gpu/drm/tests/drm_connector_test.c b/drivers/gpu/drm/tests/drm_connector_test.c
> index 6a3651b08c81..b9c80d282380 100644
> --- a/drivers/gpu/drm/tests/drm_connector_test.c
> +++ b/drivers/gpu/drm/tests/drm_connector_test.c
> @@ -189,6 +189,7 @@ static void drm_test_connector_hdmi_init_valid(struct kunit *test)
>         int ret;
>
>         ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
> +                                      "Vendor", "Product",
>                                        &dummy_funcs,
>                                        &dummy_hdmi_funcs,
>                                        DRM_MODE_CONNECTOR_HDMIA,
> @@ -208,6 +209,7 @@ static void drm_test_connector_hdmi_init_null_ddc(struct kunit *test)
>         int ret;
>
>         ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
> +                                      "Vendor", "Product",
>                                        &dummy_funcs,
>                                        &dummy_hdmi_funcs,
>                                        DRM_MODE_CONNECTOR_HDMIA,
> @@ -227,6 +229,7 @@ static void drm_test_connector_hdmi_init_bpc_invalid(struct kunit *test)
>         int ret;
>
>         ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
> +                                      "Vendor", "Product",
>                                        &dummy_funcs,
>                                        &dummy_hdmi_funcs,
>                                        DRM_MODE_CONNECTOR_HDMIA,
> @@ -246,6 +249,7 @@ static void drm_test_connector_hdmi_init_bpc_null(struct kunit *test)
>         int ret;
>
>         ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
> +                                      "Vendor", "Product",
>                                        &dummy_funcs,
>                                        &dummy_hdmi_funcs,
>                                        DRM_MODE_CONNECTOR_HDMIA,
> @@ -269,6 +273,7 @@ static void drm_test_connector_hdmi_init_bpc_8(struct kunit *test)
>         int ret;
>
>         ret = drmm_connector_hdmi_init(&priv->drm, connector,
> +                                      "Vendor", "Product",
>                                        &dummy_funcs,
>                                        &dummy_hdmi_funcs,
>                                        DRM_MODE_CONNECTOR_HDMIA,
> @@ -304,6 +309,7 @@ static void drm_test_connector_hdmi_init_bpc_10(struct kunit *test)
>         int ret;
>
>         ret = drmm_connector_hdmi_init(&priv->drm, connector,
> +                                      "Vendor", "Product",
>                                        &dummy_funcs,
>                                        &dummy_hdmi_funcs,
>                                        DRM_MODE_CONNECTOR_HDMIA,
> @@ -339,6 +345,7 @@ static void drm_test_connector_hdmi_init_bpc_12(struct kunit *test)
>         int ret;
>
>         ret = drmm_connector_hdmi_init(&priv->drm, connector,
> +                                      "Vendor", "Product",
>                                        &dummy_funcs,
>                                        &dummy_hdmi_funcs,
>                                        DRM_MODE_CONNECTOR_HDMIA,
> @@ -370,6 +377,7 @@ static void drm_test_connector_hdmi_init_formats_empty(struct kunit *test)
>         int ret;
>
>         ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
> +                                      "Vendor", "Product",
>                                        &dummy_funcs,
>                                        &dummy_hdmi_funcs,
>                                        DRM_MODE_CONNECTOR_HDMIA,
> @@ -389,6 +397,7 @@ static void drm_test_connector_hdmi_init_formats_no_rgb(struct kunit *test)
>         int ret;
>
>         ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
> +                                      "Vendor", "Product",
>                                        &dummy_funcs,
>                                        &dummy_hdmi_funcs,
>                                        DRM_MODE_CONNECTOR_HDMIA,
> @@ -409,6 +418,7 @@ static void drm_test_connector_hdmi_init_type_valid(struct kunit *test)
>         int ret;
>
>         ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
> +                                      "Vendor", "Product",
>                                        &dummy_funcs,
>                                        &dummy_hdmi_funcs,
>                                        connector_type,
> @@ -443,6 +453,7 @@ static void drm_test_connector_hdmi_init_type_invalid(struct kunit *test)
>         int ret;
>
>         ret = drmm_connector_hdmi_init(&priv->drm, &priv->connector,
> +                                      "Vendor", "Product",
>                                        &dummy_funcs,
>                                        &dummy_hdmi_funcs,
>                                        connector_type,
> @@ -708,6 +719,7 @@ static void drm_test_drm_connector_attach_broadcast_rgb_property_hdmi_connector(
>         int ret;
>
>         ret = drmm_connector_hdmi_init(&priv->drm, connector,
> +                                      "Vendor", "Product",
>                                        &dummy_funcs,
>                                        &dummy_hdmi_funcs,
>                                        DRM_MODE_CONNECTOR_HDMIA,
> diff --git a/include/drm/drm_atomic_state_helper.h b/include/drm/drm_atomic_state_helper.h
> index d59d2b3aef9a..22f083968aa8 100644
> --- a/include/drm/drm_atomic_state_helper.h
> +++ b/include/drm/drm_atomic_state_helper.h
> @@ -40,6 +40,8 @@ struct drm_private_state;
>  struct drm_modeset_acquire_ctx;
>  struct drm_device;
>
> +struct hdmi_audio_infoframe;
> +
>  void __drm_atomic_helper_crtc_state_reset(struct drm_crtc_state *state,
>                                           struct drm_crtc *crtc);
>  void __drm_atomic_helper_crtc_reset(struct drm_crtc *crtc,
> @@ -88,6 +90,12 @@ void
>  __drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state);
>  void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
>                                           struct drm_connector_state *state);
> +
> +int drm_atomic_helper_connector_hdmi_update_audio_infoframe(struct drm_connector *connector,
> +                                                           struct hdmi_audio_infoframe *frame);
> +int drm_atomic_helper_connector_hdmi_update_infoframes(struct drm_connector *connector,
> +                                                      struct drm_atomic_state *state);
> +
>  void __drm_atomic_helper_private_obj_duplicate_state(struct drm_private_obj *obj,
>                                                      struct drm_private_state *state);
>
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 3eaf4d54364d..5964ef283022 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -914,6 +914,21 @@ struct drm_tv_connector_state {
>         unsigned int hue;
>  };
>
> +/**
> + * struct drm_connector_hdmi_infoframe - HDMI Infoframe container
> + */
> +struct drm_connector_hdmi_infoframe {
> +       /**
> +        * @data: HDMI Infoframe structure
> +        */
> +       union hdmi_infoframe data;
> +
> +       /**
> +        * @set: Is the content of @data valid?
> +        */
> +       bool set;
> +};
> +
>  /**
>   * struct drm_connector_state - mutable connector state
>   */
> @@ -1070,6 +1085,35 @@ struct drm_connector_state {
>                  */
>                 enum drm_hdmi_broadcast_rgb broadcast_rgb;
>
> +               /**
> +                * @infoframes: HDMI Infoframes matching that state
> +                */
> +               struct {
> +                       /**
> +                        * @avi: AVI Infoframes structure matching our
> +                        * state.
> +                        */
> +                       struct drm_connector_hdmi_infoframe avi;
> +
> +                       /**
> +                        * @hdr_drm: DRM (Dynamic Range and Mastering)
> +                        * Infoframes structure matching our state.
> +                        */
> +                       struct drm_connector_hdmi_infoframe hdr_drm;
> +
> +                       /**
> +                        * @spd: SPD Infoframes structure matching our
> +                        * state.
> +                        */
> +                       struct drm_connector_hdmi_infoframe spd;
> +
> +                       /**
> +                        * @vendor: HDMI Vendor Infoframes structure
> +                        * matching our state.
> +                        */
> +                       struct drm_connector_hdmi_infoframe hdmi;
> +               } infoframes;
> +
>                 /**
>                  * @is_full_range: Is the output supposed to use a full
>                  * RGB Quantization Range or not?
> @@ -1115,6 +1159,41 @@ struct drm_connector_hdmi_funcs {
>         (*tmds_char_rate_valid)(const struct drm_connector *connector,
>                                 const struct drm_display_mode *mode,
>                                 unsigned long long tmds_rate);
> +
> +       /**
> +        * @clear_infoframe:
> +        *
> +        * This callback is invoked through
> +        * @drm_atomic_helper_hdmi_connector_update_infoframes during a
> +        * commit to clear the infoframes into the hardware. It will be
> +        * called multiple times, once for every disabled infoframe
> +        * type.
> +        *
> +        * The @clear_infoframe callback is optional.
> +        *
> +        * Returns:
> +        * 0 on success, a negative error code otherwise
> +        */
> +       int (*clear_infoframe)(struct drm_connector *connector,
> +                              enum hdmi_infoframe_type type);
> +
> +       /**
> +        * @write_infoframe:
> +        *
> +        * This callback is invoked through
> +        * @drm_atomic_helper_hdmi_connector_update_infoframes during a
> +        * commit to program the infoframes into the hardware. It will
> +        * be called multiple times, once for every updated infoframe
> +        * type.
> +        *
> +        * The @write_infoframe callback is mandatory.
> +        *
> +        * Returns:
> +        * 0 on success, a negative error code otherwise
> +        */
> +       int (*write_infoframe)(struct drm_connector *connector,
> +                              enum hdmi_infoframe_type type,
> +                              const u8 *buffer, size_t len);
>  };
>
>  /**
> @@ -1986,6 +2065,18 @@ struct drm_connector {
>          * @hdmi: HDMI-related variable and properties.
>          */
>         struct {
> +#define DRM_CONNECTOR_HDMI_VENDOR_LEN  8
> +               /**
> +                * @vendor: HDMI Controller Vendor Name
> +                */
> +               unsigned char vendor[DRM_CONNECTOR_HDMI_VENDOR_LEN] __nonstring;
> +
> +#define DRM_CONNECTOR_HDMI_PRODUCT_LEN 16
> +               /**
> +                * @product: HDMI Controller Product Name
> +                */
> +               unsigned char product[DRM_CONNECTOR_HDMI_PRODUCT_LEN] __nonstring;
> +
>                 /**
>                  * @supported_formats: Bitmask of @hdmi_colorspace
>                  * supported by the controller.
> @@ -1996,6 +2087,47 @@ struct drm_connector {
>                  * @funcs: HDMI connector Control Functions
>                  */
>                 const struct drm_connector_hdmi_funcs *funcs;
> +
> +               /**
> +                * @infoframes: Current Infoframes output by the connector
> +                */
> +               struct {
> +                       /**
> +                        * @lock: Mutex protecting against concurrent access to
> +                        * the infoframes, most notably between KMS and ALSA.
> +                        */
> +                       struct mutex lock;
> +
> +                       /**
> +                        * @audio: Current Audio Infoframes structure. Protected
> +                        * by @lock.
> +                        */
> +                       struct drm_connector_hdmi_infoframe audio;
> +
> +                       /**
> +                        * @avi: Current AVI Infoframes structure. Protected by
> +                        * @lock.
> +                        */
> +                       struct drm_connector_hdmi_infoframe avi;
> +
> +                       /**
> +                        * @hdr_drm: Current DRM (Dynamic Range and Mastering)
> +                        * Infoframes structure. Protected by @lock.
> +                        */
> +                       struct drm_connector_hdmi_infoframe hdr_drm;
> +
> +                       /**
> +                        * @spd: Current SPD Infoframes structure. Protected by
> +                        * @lock.
> +                        */
> +                       struct drm_connector_hdmi_infoframe spd;
> +
> +                       /**
> +                        * @vendor: Current HDMI Vendor Infoframes structure.
> +                        * Protected by @lock.
> +                        */
> +                       struct drm_connector_hdmi_infoframe hdmi;
> +               } infoframes;
>         } hdmi;
>  };
>
> @@ -2017,6 +2149,7 @@ int drmm_connector_init(struct drm_device *dev,
>                         struct i2c_adapter *ddc);
>  int drmm_connector_hdmi_init(struct drm_device *dev,
>                              struct drm_connector *connector,
> +                            const char *vendor, const char *product,
>                              const struct drm_connector_funcs *funcs,
>                              const struct drm_connector_hdmi_funcs *hdmi_funcs,
>                              int connector_type,
>
> --
> 2.43.2
>
  

On Sun, Feb 25, 2024 at 05:02:51PM +0200, Dmitry Baryshkov wrote:
> > @@ -476,6 +478,7 @@ EXPORT_SYMBOL(drmm_connector_init);
> >   */
> >  int drmm_connector_hdmi_init(struct drm_device *dev,
> >                              struct drm_connector *connector,
> > +                            const char *vendor, const char *product,
> >                              const struct drm_connector_funcs *funcs,
> >                              const struct drm_connector_hdmi_funcs *hdmi_funcs,
> >                              int connector_type,
> > @@ -485,6 +488,13 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
> >  {
> >         int ret;
> >
> > +       if (!vendor || !product)
> > +               return -EINVAL;
> > +
> > +       if ((strlen(vendor) > DRM_CONNECTOR_HDMI_VENDOR_LEN) ||
> > +           (strlen(product) > DRM_CONNECTOR_HDMI_PRODUCT_LEN))
> > +               return -EINVAL;
> > +
> >         if (!(connector_type == DRM_MODE_CONNECTOR_HDMIA ||
> >               connector_type == DRM_MODE_CONNECTOR_HDMIB))
> >                 return -EINVAL;
> > @@ -500,6 +510,12 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
> >                 return ret;
> >
> >         connector->hdmi.supported_formats = supported_formats;
> > +       strtomem_pad(connector->hdmi.vendor, vendor, 0);
> > +       strtomem_pad(connector->hdmi.product, product, 0);
> > +
> > +       ret = drmm_mutex_init(dev, &connector->hdmi.infoframes.lock);
> 
> I'd suggest moving this call to the generic __drm_connector_init().
> This way no matter how the rest of the drm code (mis)uses the
> connector, the lock is always present and valid.

Yeah, that makes sense, I'll change it.

Thanks!
Maxime