[PATCH v6 11/35] drm/i915: Enable and Disable of HDCP2.2
Shankar, Uma
uma.shankar at intel.com
Tue Jul 31 20:49:14 UTC 2018
>-----Original Message-----
>From: C, Ramalingam
>Sent: Saturday, July 14, 2018 8:45 AM
>To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org;
>daniel at ffwll.ch; seanpaul at chromium.org; Winkler, Tomas
><tomas.winkler at intel.com>; Usyskin, Alexander <alexander.usyskin at intel.com>;
>Shankar, Uma <uma.shankar at intel.com>
>Cc: Sharma, Shashank <shashank.sharma at intel.com>; C, Ramalingam
><ramalingam.c at intel.com>
>Subject: [PATCH v6 11/35] drm/i915: Enable and Disable of HDCP2.2
>
>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
Instead of Panel, call it as sink.
>+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
Same as above.
>+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. */
Here too.
>+ 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);
>+ }
>
x>- 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) {
The return value is not handled in the call chain. Please check for return value
in the calling functions.
>+ 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)
As Described above.
>+{
>+ 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);
Handle the error returned.
>+
>+ 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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