[Intel-gfx] [PATCH v6 11/35] drm/i915: Enable and Disable of HDCP2.2
Ramalingam C
ramalingam.c at intel.com
Sat Jul 14 03:14:53 UTC 2018
Considering that HDCP2.2 is more secure than HDCP1.4, When a setup
supports HDCP2.2 and HDCP1.4, HDCP2.2 will be enabled.
When HDCP2.2 enabling fails and HDCP1.4 is supported, HDCP1.4 is
enabled.
This change implements a sequence of enabling and disabling of
HDCP2.2 authentication and HDCP2.2 port encryption.
v2:
Included few optimization suggestions [Chris Wilson]
Commit message is updated as per the rebased version.
intel_wait_for_register is used instead of wait_for. [Chris Wilson]
v3:
No changes.
v4:
Extra comment added and Style issue fixed [Uma]
v5:
Rebased as part of patch reordering.
HDCP2 encryption status is tracked.
HW state check is moved into WARN_ON [Daniel]
v6:
Redefined the mei service functions as per comp redesign.
Merged patches related to hdcp2.2 enabling and disabling [Sean Paul].
Required shim functionality is defined [Sean Paul]
Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
drivers/gpu/drm/i915/intel_drv.h | 5 +
drivers/gpu/drm/i915/intel_hdcp.c | 226 ++++++++++++++++++++++++++++++++++++--
2 files changed, 221 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 38262792813a..21683702bcdc 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -380,6 +380,10 @@ struct intel_hdcp_shim {
/* Detects the HDCP protocol(DP/HDMI) required on the port */
enum hdcp_protocol (*hdcp_protocol)(void);
+
+ /* Detects whether Panel is HDCP2.2 capable */
+ int (*hdcp_2_2_capable)(struct intel_digital_port *intel_dig_port,
+ bool *capable);
};
struct intel_hdcp {
@@ -393,6 +397,7 @@ struct intel_hdcp {
/* HDCP2.2 related definitions */
/* Flag indicates whether this connector supports HDCP2.2 or not. */
bool hdcp2_supported;
+ bool hdcp2_in_use;
/*
* Content Stream Type defined by content owner. TYPE0(0x0) content can
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 18509c3bae08..4ace64315baa 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -17,10 +17,51 @@
#include "i915_reg.h"
#define KEY_LOAD_TRIES 5
+#define TIME_FOR_ENCRYPT_STATUS_CHANGE 32
#define GET_MEI_DDI_INDEX(port) (((port) == PORT_A) ? DDI_A : \
(enum hdcp_physical_port)(port))
static int intel_hdcp2_init(struct intel_connector *connector);
+static int _intel_hdcp2_enable(struct intel_connector *connector);
+static int _intel_hdcp2_disable(struct intel_connector *connector);
+static
+int intel_hdcp_read_valid_bksv(struct intel_digital_port *intel_dig_port,
+ const struct intel_hdcp_shim *shim, u8 *bksv);
+static
+struct intel_digital_port *conn_to_dig_port(struct intel_connector *connector);
+
+/* Is HDCP1.4 capable on Platform and Panel */
+static bool intel_hdcp_capable(struct intel_connector *connector)
+{
+ struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
+ struct intel_hdcp *hdcp = &connector->hdcp;
+ bool capable = false;
+ u8 bksv[5];
+
+ if (hdcp->shim->hdcp_capable) {
+ hdcp->shim->hdcp_capable(intel_dig_port, &capable);
+ } else {
+ if (!intel_hdcp_read_valid_bksv(intel_dig_port,
+ hdcp->shim, bksv))
+ capable = true;
+ }
+
+ return capable;
+}
+
+/* Is HDCP2.2 capable on Platform and Panel */
+static bool intel_hdcp2_capable(struct intel_connector *connector)
+{
+ struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
+ struct intel_hdcp *hdcp = &connector->hdcp;
+ bool capable = false;
+
+ /* Check the panel's hdcp2.2 compliance if platform supports it. */
+ if (hdcp->hdcp2_supported)
+ hdcp->shim->hdcp_2_2_capable(intel_dig_port, &capable);
+
+ return capable;
+}
static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port,
const struct intel_hdcp_shim *shim)
@@ -791,22 +832,33 @@ int intel_hdcp_init(struct intel_connector *connector,
int intel_hdcp_enable(struct intel_connector *connector)
{
struct intel_hdcp *hdcp = &connector->hdcp;
- int ret;
+ int ret = -EINVAL;
if (!hdcp->shim)
return -ENOENT;
mutex_lock(&hdcp->mutex);
- ret = _intel_hdcp_enable(connector);
- if (ret)
- goto out;
+ /*
+ * Considering that HDCP2.2 is more secure than HDCP1.4, If the setup
+ * is capable of HDCP2.2, it is preferred to use HDCP2.2.
+ */
+ if (intel_hdcp2_capable(connector))
+ ret = _intel_hdcp2_enable(connector);
+
+ /* When HDCP2.2 fails, HDCP1.4 will be attempted */
+ if (ret && intel_hdcp_capable(connector)) {
+ ret = _intel_hdcp_enable(connector);
+ if (!ret)
+ schedule_delayed_work(&hdcp->check_work,
+ DRM_HDCP_CHECK_PERIOD_MS);
+ }
+
+ if (!ret) {
+ hdcp->value = DRM_MODE_CONTENT_PROTECTION_ENABLED;
+ schedule_work(&hdcp->prop_work);
+ }
- hdcp->value = DRM_MODE_CONTENT_PROTECTION_ENABLED;
- schedule_work(&hdcp->prop_work);
- schedule_delayed_work(&hdcp->check_work,
- DRM_HDCP_CHECK_PERIOD_MS);
-out:
mutex_unlock(&hdcp->mutex);
return ret;
}
@@ -823,7 +875,10 @@ int intel_hdcp_disable(struct intel_connector *connector)
if (hdcp->value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
hdcp->value = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
- ret = _intel_hdcp_disable(connector);
+ if (hdcp->hdcp2_in_use)
+ ret = _intel_hdcp2_disable(connector);
+ else
+ ret = _intel_hdcp_disable(connector);
}
mutex_unlock(&hdcp->mutex);
@@ -923,6 +978,157 @@ int intel_hdcp_check_link(struct intel_connector *connector)
return ret;
}
+static int hdcp2_close_mei_session(struct intel_connector *connector)
+{
+ struct mei_hdcp_data *data = &connector->hdcp.mei_data;
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct i915_component_master *comp = dev_priv->comp_master;
+
+ if (!comp)
+ return -EINVAL;
+
+ if (!comp->hdcp_ops || !comp->mei_cldev || data->port == INVALID_PORT)
+ return -EINVAL;
+
+ return comp->hdcp_ops->close_hdcp_session(comp->mei_cldev, data);
+}
+
+static int hdcp2_deauthenticate_port(struct intel_connector *connector)
+{
+ return hdcp2_close_mei_session(connector);
+}
+
+static int hdcp2_authenticate_sink(struct intel_connector *connector)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+ DRM_ERROR("Sink authentication is done in subsequent patches\n");
+ return -EINVAL;
+}
+
+static int hdcp2_enable_encryption(struct intel_connector *connector)
+{
+ struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_hdcp *hdcp = &connector->hdcp;
+ enum port port = connector->encoder->port;
+ int ret;
+
+ WARN_ON(I915_READ(HDCP2_STATUS_DDI(port)) & LINK_ENCRYPTION_STATUS);
+
+ if (hdcp->shim->toggle_signalling)
+ hdcp->shim->toggle_signalling(intel_dig_port, true);
+
+ if (I915_READ(HDCP2_STATUS_DDI(port)) & LINK_AUTH_STATUS) {
+ /* Link is Authenticated. Now set for Encryption */
+ I915_WRITE(HDCP2_CTL_DDI(port),
+ I915_READ(HDCP2_CTL_DDI(port)) |
+ CTL_LINK_ENCRYPTION_REQ);
+ }
+
+ ret = intel_wait_for_register(dev_priv, HDCP2_STATUS_DDI(port),
+ LINK_ENCRYPTION_STATUS,
+ LINK_ENCRYPTION_STATUS,
+ TIME_FOR_ENCRYPT_STATUS_CHANGE);
+
+ return ret;
+}
+
+static int hdcp2_disable_encryption(struct intel_connector *connector)
+{
+ struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_hdcp *hdcp = &connector->hdcp;
+ enum port port = connector->encoder->port;
+ int ret;
+
+ WARN_ON(!(I915_READ(HDCP2_STATUS_DDI(port)) & LINK_ENCRYPTION_STATUS));
+
+ I915_WRITE(HDCP2_CTL_DDI(port),
+ I915_READ(HDCP2_CTL_DDI(port)) & ~CTL_LINK_ENCRYPTION_REQ);
+
+ ret = intel_wait_for_register(dev_priv, HDCP2_STATUS_DDI(port),
+ LINK_ENCRYPTION_STATUS, 0x0,
+ TIME_FOR_ENCRYPT_STATUS_CHANGE);
+ if (ret == -ETIMEDOUT)
+ DRM_DEBUG_KMS("Disable Encryption Timedout");
+
+ if (hdcp->shim->toggle_signalling)
+ hdcp->shim->toggle_signalling(intel_dig_port, false);
+
+ return ret;
+}
+
+static int hdcp2_authenticate_and_encrypt(struct intel_connector *connector)
+{
+ int ret, i, tries = 3;
+
+ for (i = 0; i < tries; i++) {
+ ret = hdcp2_authenticate_sink(connector);
+ if (!ret)
+ break;
+
+ /* Clearing the mei hdcp session */
+ hdcp2_deauthenticate_port(connector);
+ DRM_DEBUG_KMS("HDCP2.2 Auth %d of %d Failed.(%d)\n",
+ i + 1, tries, ret);
+ }
+
+ if (i != tries) {
+ /*
+ * Ensuring the required 200mSec min time interval between
+ * Session Key Exchange and encryption.
+ */
+ msleep(HDCP_2_2_DELAY_BEFORE_ENCRYPTION_EN);
+ ret = hdcp2_enable_encryption(connector);
+ if (ret < 0) {
+ DRM_DEBUG_KMS("Encryption Enable Failed.(%d)\n", ret);
+ hdcp2_deauthenticate_port(connector);
+ }
+ }
+
+ return ret;
+}
+
+static int _intel_hdcp2_enable(struct intel_connector *connector)
+{
+ struct intel_hdcp *hdcp = &connector->hdcp;
+ int ret;
+
+ DRM_DEBUG_KMS("[%s:%d] HDCP2.2 is being enabled. Type: %d\n",
+ connector->base.name, connector->base.base.id,
+ hdcp->content_type);
+
+ ret = hdcp2_authenticate_and_encrypt(connector);
+ if (ret) {
+ DRM_ERROR("HDCP2 Type%d Enabling Failed. (%d)\n",
+ hdcp->content_type, ret);
+ return ret;
+ }
+
+ DRM_DEBUG_KMS("[%s:%d] HDCP2.2 is enabled. Type %d\n",
+ connector->base.name, connector->base.base.id,
+ hdcp->content_type);
+
+ hdcp->hdcp2_in_use = true;
+ return 0;
+}
+
+static int _intel_hdcp2_disable(struct intel_connector *connector)
+{
+ int ret;
+
+ DRM_DEBUG_KMS("[%s:%d] HDCP2.2 is being Disabled\n",
+ connector->base.name, connector->base.base.id);
+
+ ret = hdcp2_disable_encryption(connector);
+
+ hdcp2_deauthenticate_port(connector);
+ connector->hdcp.hdcp2_in_use = false;
+
+ return ret;
+}
+
static int i915_hdcp_component_match(struct device *dev, void *data)
{
return !strcmp(dev->driver->name, "mei_hdcp");
--
2.7.4
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