linux-kernel - [PATCH v1 1/2] DRM: Create new Content Protection connector property

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Message-ID: <20230421161237.357342-2-markyacoub@google.com>
Date:   Fri, 21 Apr 2023 12:12:36 -0400
From:   Mark Yacoub <markyacoub@...omium.org>
To:     dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     seanpaul@...omium.org, dianders@...omium.org,
        dmitry.baryshkov@...aro.org, Mark Yacoub <markyacoub@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/2] DRM: Create new Content Protection connector property

From: Mark Yacoub <markyacoub@...omium.org>

[Why]
To enable Protected Content, some drivers require a key to be injected
from user space to enable HDCP on the connector.

[How]
Create new "Content Protection Property" of type "Blob"

Signed-off-by: Mark Yacoub <markyacoub@...omium.org>
---
 drivers/gpu/drm/drm_atomic_uapi.c | 9 +++++++++
 include/drm/drm_connector.h       | 6 ++++++
 include/drm/drm_mode_config.h     | 6 ++++++
 3 files changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index d867e7f9f2cd5..e20bc57cdb05c 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -749,6 +749,11 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector,
 		state->content_protection = val;
 	} else if (property == config->hdcp_content_type_property) {
 		state->hdcp_content_type = val;
+	} else if (property == config->content_protection_key_property) {
+		ret = drm_atomic_replace_property_blob_from_id(
+			dev, &state->content_protection_key, val, -1, -1,
+			&replaced);
+		return ret;
 	} else if (property == connector->colorspace_property) {
 		state->colorspace = val;
 	} else if (property == config->writeback_fb_id_property) {
@@ -843,6 +848,10 @@ drm_atomic_connector_get_property(struct drm_connector *connector,
 		*val = state->content_protection;
 	} else if (property == config->hdcp_content_type_property) {
 		*val = state->hdcp_content_type;
+	} else if (property == config->content_protection_key_property) {
+		*val = state->content_protection_key ?
+			       state->content_protection_key->base.id :
+			       0;
 	} else if (property == config->writeback_fb_id_property) {
 		/* Writeback framebuffer is one-shot, write and forget */
 		*val = 0;
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 7b5048516185c..2fbe51272bfeb 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -896,6 +896,12 @@ struct drm_connector_state {
 	 */
 	unsigned int content_protection;
 
+	/**
+	 * @content_protection_key: DRM blob property for holding the Content
+	 * Protection Key injected from user space.
+	 */
+	struct drm_property_blob *content_protection_key;
+
 	/**
 	 * @colorspace: State variable for Connector property to request
 	 * colorspace change on Sink. This is most commonly used to switch
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index e5b053001d22e..615d1e5f57562 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -887,6 +887,12 @@ struct drm_mode_config {
 	 */
 	struct drm_property *hdcp_content_type_property;
 
+	/**
+	 * @content_protection_key_property: DRM blob property that receives the 
+	 * content protection key from user space to be injected into the kernel.
+	 */
+	struct drm_property *content_protection_key_property;
+
 	/* dumb ioctl parameters */
 	uint32_t preferred_depth, prefer_shadow;
 
-- 
2.40.0.634.g4ca3ef3211-goog