[PATCH v3 07/10] drm/i915: Populate downstream info for HDCP1.4

Ramalingam C
2019-03-22T00:44:45Z

Implements drm blob property content_protection_downstream_info
property on HDCP capable connectors.

Downstream topology info is gathered across authentication stages
and stored in intel_hdcp. When HDCP authentication is complete,
new blob with latest downstream topology information is updated to
content_protection_downstream_info property.

v2:
%s/cp_downstream/content_protection_downstream [daniel]
v3:
%s/content_protection_downstream/hdcp_topology [daniel]

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
drivers/gpu/drm/i915/intel_drv.h | 2 ++
drivers/gpu/drm/i915/intel_hdcp.c | 30 +++++++++++++++++++++++++++++-
include/drm/drm_hdcp.h | 1 +
include/uapi/drm/drm_mode.h | 5 +++++
4 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 4db15ee81042..46325fb33507 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -482,6 +482,8 @@ struct intel_hdcp {
wait_queue_head_t cp_irq_queue;
atomic_t cp_irq_count;
int cp_irq_count_cached;
+
+ struct hdcp_topology_info *topology_info;
};

struct intel_connector {
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 921f07c64350..0e3d7afecd5a 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -580,6 +580,9 @@ int intel_hdcp_auth_downstream(struct intel_hdcp *hdcp,
if (num_downstream == 0)
return -EINVAL;

+ hdcp->topology_info->device_count = num_downstream;
+ hdcp->topology_info->depth = DRM_HDCP_DEPTH(bstatus[1]);
+
ksv_fifo = kcalloc(DRM_HDCP_KSV_LEN, num_downstream, GFP_KERNEL);
if (!ksv_fifo)
return -ENOMEM;
@@ -593,6 +596,8 @@ int intel_hdcp_auth_downstream(struct intel_hdcp *hdcp,
return -EPERM;
}

+ memcpy(hdcp->topology_info->ksv_list, ksv_fifo,
+ num_downstream * DRM_HDCP_KSV_LEN);
/*
* When V prime mismatches, DP Spec mandates re-read of
* V prime atleast twice.
@@ -694,15 +699,20 @@ static int intel_hdcp_auth(struct intel_connector *connector)
return -EPERM;
}

+ hdcp->topology_info->ver_in_force = DRM_MODE_HDCP14_IN_FORCE;
+ memcpy(hdcp->topology_info->bksv, bksv.shim, DRM_MODE_HDCP_KSV_LEN);
+
I915_WRITE(PORT_HDCP_BKSVLO(port), bksv.reg[0]);
I915_WRITE(PORT_HDCP_BKSVHI(port), bksv.reg[1]);

ret = shim->repeater_present(intel_dig_port, &repeater_present);
if (ret)
return ret;
- if (repeater_present)
+ if (repeater_present) {
I915_WRITE(HDCP_REP_CTL,
intel_hdcp_get_repeater_ctl(intel_dig_port));
+ hdcp->topology_info->is_repeater = true;
+ }

ret = shim->toggle_signalling(intel_dig_port, true);
if (ret)
@@ -798,6 +808,12 @@ static int _intel_hdcp_disable(struct intel_connector *connector)
return ret;
}

+ memset(hdcp->topology_info, 0, sizeof(struct hdcp_topology_info));
+
+ if (drm_connector_update_hdcp_topology_property(&connector->base,
+ connector->hdcp.topology_info))
+ DRM_ERROR("Downstream_info update failed.\n");
+
DRM_DEBUG_KMS("HDCP is disabled\n");
return 0;
}
@@ -831,6 +847,10 @@ static int _intel_hdcp_enable(struct intel_connector *connector)
ret = intel_hdcp_auth(connector);
if (!ret) {
connector->hdcp.hdcp_encrypted = true;
+ if (drm_connector_update_hdcp_topology_property(
+ &connector->base,
+ connector->hdcp.topology_info))
+ DRM_ERROR("Downstream_info update failed.\n");
return 0;
}

@@ -1882,6 +1902,14 @@ int intel_hdcp_init(struct intel_connector *connector,
if (ret)
return ret;

+ ret = drm_connector_attach_hdcp_topology_property(&connector->base);
+ if (ret)
+ return ret;
+
+ hdcp->topology_info = kzalloc(sizeof(*hdcp->topology_info), GFP_KERNEL);
+ if (!hdcp->topology_info)
+ return -ENOMEM;
+
hdcp->shim = shim;
mutex_init(&hdcp->mutex);
INIT_DELAYED_WORK(&hdcp->check_work, intel_hdcp_check_work);
diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h
index 652aaf5d658e..654a170f03eb 100644
--- a/include/drm/drm_hdcp.h
+++ b/include/drm/drm_hdcp.h
@@ -23,6 +23,7 @@
#define DRM_HDCP_V_PRIME_PART_LEN 4
#define DRM_HDCP_V_PRIME_NUM_PARTS 5
#define DRM_HDCP_NUM_DOWNSTREAM(x) (x & 0x7f)
+#define DRM_HDCP_DEPTH(x) ((x) & 0x7)
#define DRM_HDCP_MAX_CASCADE_EXCEEDED(x) (x & BIT(3))
#define DRM_HDCP_MAX_DEVICE_EXCEEDED(x) (x & BIT(7))

diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 03d3aa2b1a49..733db7283e57 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -216,8 +216,13 @@ extern "C" {

#define DRM_MODE_HDCP_KSV_LEN 5
#define DRM_MODE_HDCP_MAX_DEVICE_CNT 127
+#define DRM_MODE_HDCP14_IN_FORCE (1 << 0)
+#define DRM_MODE_HDCP22_IN_FORCE (1 << 1)

struct hdcp_topology_info {
+ /* Version of HDCP authenticated (1.4/2.2) */
+ __u32 ver_in_force;
+
/* KSV of immediate HDCP Sink. In Little-Endian Format. */
char bksv[DRM_MODE_HDCP_KSV_LEN];

--
2.19.1

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