On Thu, Apr 18, 2019 at 02:27:56PM +0530, Ramalingam C wrote:
> This patch adds a DRM ENUM property to the selected connectors.
> This property is used for mentioning the protected content's type
> from userspace to kernel HDCP authentication.
>
> Type of the stream is decided by the protected content providers.
> Type 0 content can be rendered on any HDCP protected display wires.
> But Type 1 content can be rendered only on HDCP2.2 protected paths.
>
> So when a userspace sets this property to Type 1 and starts the HDCP
> enable, kernel will honour it only if HDCP2.2 authentication is through
> for type 1. Else HDCP enable will be failed.
>
> v2:
> cp_content_type is replaced with content_protection_type [daniel]
> check at atomic_set_property is removed [Maarten]
> v3:
> %s/content_protection_type/hdcp_content_type [Pekka]
> v4:
> property is created for the first requested connector and then reused.
> [Danvet]
>
> Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_atomic_uapi.c | 4 +++
> drivers/gpu/drm/drm_connector.c | 53 ++++++++++++++++++++++++++++++-
> drivers/gpu/drm/i915/intel_hdcp.c | 4 ++-
> include/drm/drm_connector.h | 9 +++++-
> include/drm/drm_mode_config.h | 6 ++++
> include/uapi/drm/drm_mode.h | 4 +++
> 6 files changed, 77 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
> index 002dcede7915..0b0747869963 100644
> --- a/drivers/gpu/drm/drm_atomic_uapi.c
> +++ b/drivers/gpu/drm/drm_atomic_uapi.c
> @@ -733,6 +733,8 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector,
> return -EINVAL;
> }
> state->content_protection = val;
> + } else if (property == config->hdcp_content_type_property) {
> + state->hdcp_content_type = val;
> } else if (property == connector->colorspace_property) {
> state->colorspace = val;
> } else if (property == config->writeback_fb_id_property) {
> @@ -809,6 +811,8 @@ drm_atomic_connector_get_property(struct drm_connector *connector,
> *val = state->scaling_mode;
> } else if (property == config->content_protection_property) {
> *val = state->content_protection;
> + } else if (property == config->hdcp_content_type_property) {
> + *val = state->hdcp_content_type;
> } else if (property == config->writeback_fb_id_property) {
> /* Writeback framebuffer is one-shot, write and forget */
> *val = 0;
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 7c0eda9cca60..03907d13ef66 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -857,6 +857,13 @@ static const struct drm_prop_enum_list hdmi_colorspaces[] = {
> { DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER, "DCI-P3_RGB_Theater" },
> };
>
> +static struct drm_prop_enum_list drm_hdcp_content_type_enum_list[] = {
> + { DRM_MODE_HDCP_CONTENT_TYPE0, "HDCP Type0" },
> + { DRM_MODE_HDCP_CONTENT_TYPE1, "HDCP Type1" },
> +};
> +DRM_ENUM_NAME_FN(drm_get_hdcp_content_type_name,
> + drm_hdcp_content_type_enum_list)
> +
> /**
> * DOC: standard connector properties
> *
> @@ -962,6 +969,23 @@ static const struct drm_prop_enum_list hdmi_colorspaces[] = {
> * the value transitions from ENABLED to DESIRED. This signifies the link
> * is no longer protected and userspace should take appropriate action
> * (whatever that might be).
> + * HDCP Content Type:
> + * This property is used by the userspace to configure the kernel with
> + * upcoming stream's content type. Content Type of a stream is decided by
"upcoming" sounds a bit like "in a future patch", which is confusing in
documentation. Maybe "to be displayed" instead of "upcoming"?
> + * the owner of the stream, as HDCP Type0 or HDCP Type1.
> + *
> + * The value of the property can be one the below:
> + * - DRM_MODE_HDCP_CONTENT_TYPE0 = 0
> + * HDCP Type0 streams can be transmitted on a link which is
> + * encrypted with HDCP 1.4 or HDCP 2.2.
> + * - DRM_MODE_HDCP_CONTENT_TYPE1 = 1
> + * HDCP Type1 streams can be transmitted on a link which is
> + * encrypted only with HDCP 2.2.
> + *
> + * Please note this content type is introduced at HDCP 2.2 and used in its
> + * authentication process.
I'd replace this with "Note that the HDCP Content Type property is
optional, and defaults to type 0. It is only exposed by drivers supporting
HDCP 2.x." I think that makes it clearer for userspace people what this
means.
> If content type is changed when
> + * content_protection is not UNDESIRED, then kernel will disable the HDCP
> + * and re-enable with new type in the same atomic commit
> *
> * max bpc:
> * This range property is used by userspace to limit the bit depth. When
> @@ -1520,18 +1544,29 @@ EXPORT_SYMBOL(drm_connector_attach_scaling_mode_property);
> * property
> *
> * @connector: connector to attach CP property on.
> + * @hdcp_content_type: is HDCP Content Type property needed for connector
> *
> * This is used to add support for content protection on select connectors.
> * Content Protection is intentionally vague to allow for different underlying
> * technologies, however it is most implemented by HDCP.
> *
> + * When hdcp_content_type is true enum property called HDCP Content Type is
> + * created (if it is not already) and attached to the connector.
> + *
> + * This property is used for sending the protected content's stream type
> + * from userspace to kernel on selected connectors. Protected content provider
> + * will decide their type of their content and declare the same to kernel.
> + *
> + * Content type will be used during the HDCP 2.2 authentication.
> + * Content type will be set to &drm_connector_state.hdcp_content_type.
> + *
> * The content protection will be set to &drm_connector_state.content_protection
> *
> * Returns:
> * Zero on success, negative errno on failure.
> */
> int drm_connector_attach_content_protection_property(
> - struct drm_connector *connector)
> + struct drm_connector *connector, bool hdcp_content_type)
> {
> struct drm_device *dev = connector->dev;
> struct drm_property *prop =
> @@ -1548,6 +1583,22 @@ int drm_connector_attach_content_protection_property(
> DRM_MODE_CONTENT_PROTECTION_UNDESIRED);
> dev->mode_config.content_protection_property = prop;
>
> + if (!hdcp_content_type)
> + return 0;
> +
> + prop = dev->mode_config.hdcp_content_type_property;
> + if (!prop)
> + prop = drm_property_create_enum(dev, 0, "HDCP Content Type",
> + drm_hdcp_content_type_enum_list,
> + ARRAY_SIZE(
> + drm_hdcp_content_type_enum_list));
> + if (!prop)
> + return -ENOMEM;
> +
> + drm_object_attach_property(&connector->base, prop,
> + DRM_MODE_HDCP_CONTENT_TYPE0);
> + dev->mode_config.hdcp_content_type_property = prop;
> +
> return 0;
> }
> EXPORT_SYMBOL(drm_connector_attach_content_protection_property);
> diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
> index 440fef448feb..a61391d374e8 100644
> --- a/drivers/gpu/drm/i915/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/intel_hdcp.c
> @@ -1798,7 +1798,9 @@ int intel_hdcp_init(struct intel_connector *connector,
> if (!shim)
> return -EINVAL;
>
> - ret = drm_connector_attach_content_protection_property(&connector->base);
> + ret =
> + drm_connector_attach_content_protection_property(&connector->base,
> + false);
> if (ret)
> return ret;
>
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 5e41942e5679..2d2c2d5e7681 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -556,6 +556,12 @@ struct drm_connector_state {
> */
> unsigned int content_type;
>
> + /**
> + * @hdcp_content_type: Connector property to pass the type of
> + * protected content. This is most commonly used for HDCP.
> + */
> + unsigned int hdcp_content_type;
> +
> /**
> * @scaling_mode: Connector property to control the
> * upscaling, mostly used for built-in panels.
> @@ -1326,6 +1332,7 @@ const char *drm_get_dvi_i_select_name(int val);
> const char *drm_get_tv_subconnector_name(int val);
> const char *drm_get_tv_select_name(int val);
> const char *drm_get_content_protection_name(int val);
> +const char *drm_get_hdcp_content_type_name(int val);
>
> int drm_mode_create_dvi_i_properties(struct drm_device *dev);
> int drm_mode_create_tv_margin_properties(struct drm_device *dev);
> @@ -1340,7 +1347,7 @@ int drm_connector_attach_scaling_mode_property(struct drm_connector *connector,
> int drm_connector_attach_vrr_capable_property(
> struct drm_connector *connector);
> int drm_connector_attach_content_protection_property(
> - struct drm_connector *connector);
> + struct drm_connector *connector, bool hdcp_content_type);
> int drm_mode_create_aspect_ratio_property(struct drm_device *dev);
> int drm_mode_create_colorspace_property(struct drm_connector *connector);
> int drm_mode_create_content_type_property(struct drm_device *dev);
> diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
> index 5764ee3c7453..b359b5b71eb9 100644
> --- a/include/drm/drm_mode_config.h
> +++ b/include/drm/drm_mode_config.h
> @@ -842,6 +842,12 @@ struct drm_mode_config {
> */
> struct drm_property *content_protection_property;
>
> + /**
> + * @hdcp_content_type_property: DRM ENUM property for type of
> + * Protected Content.
> + */
> + struct drm_property *hdcp_content_type_property;
> +
> /* dumb ioctl parameters */
> uint32_t preferred_depth, prefer_shadow;
>
> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
> index 83cd1636b9be..8ac03351fdee 100644
> --- a/include/uapi/drm/drm_mode.h
> +++ b/include/uapi/drm/drm_mode.h
> @@ -209,6 +209,10 @@ extern "C" {
> #define DRM_MODE_CONTENT_PROTECTION_DESIRED 1
> #define DRM_MODE_CONTENT_PROTECTION_ENABLED 2
>
> +/* Content Type classification for HDCP2.2 vs others */
> +#define DRM_MODE_HDCP_CONTENT_TYPE0 0
> +#define DRM_MODE_HDCP_CONTENT_TYPE1 1
> +
With the kernel doc nits addressed:
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> struct drm_mode_modeinfo {
> __u32 clock;
> __u16 hdisplay;
> --
> 2.19.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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