github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-27 08:33:17 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

drm/i915: hdcp1.4 CP_IRQ handling and SW encryption tracking

Browse Source 
"hdcp_encrypted" flag is defined to denote the HDCP1.4 encryption status.
This SW tracking is used to determine the need for real hdcp1.4 disable
and hdcp_check_link upon CP_IRQ.

On CP_IRQ we filter the CP_IRQ related to the states like Link failure
and reauthentication req etc and handle them in hdcp_check_link.
CP_IRQ corresponding to the authentication msg availability are ignored.

WARN_ON is added for the abrupt stop of HDCP encryption of a port.

v2:
  bool is used in struct for the cleaner coding. [Daniel]
  check_link work_fn is scheduled for cp_irq handling [Daniel]
v3:
  rebased.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550338640-17470-6-git-send-email-ramalingam.c@intel.com
This commit is contained in:
Ramalingam C 2019-02-16 23:06:52 +05:30 committed by Daniel Vetter
parent 9055aac765
commit 09d56393c1
3 changed files with 58 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/i915/intel_dp.c
View File

@ -4780,7 +4780,7 @@ static void intel_dp_check_service_irq(struct intel_dp *intel_dp)
intel_dp_handle_test_request(intel_dp);
if (val & DP_CP_IRQ)
intel_hdcp_check_link(intel_dp->attached_connector);
intel_hdcp_handle_cp_irq(intel_dp->attached_connector);
if (val & DP_SINK_SPECIFIC_IRQ)
DRM_DEBUG_DRIVER("Sink specific irq unhandled\n");

5
drivers/gpu/drm/i915/intel_drv.h
View File

@ -409,6 +409,9 @@ struct intel_hdcp {
struct delayed_work check_work;
struct work_struct prop_work;
/* HDCP1.4 Encryption status */
bool hdcp_encrypted;
/* HDCP2.2 related definitions */
/* Flag indicates whether this connector supports HDCP2.2 or not. */
bool hdcp2_supported;
@ -2090,12 +2093,12 @@ int intel_hdcp_init(struct intel_connector *connector,
const struct intel_hdcp_shim *hdcp_shim);
int intel_hdcp_enable(struct intel_connector *connector);
int intel_hdcp_disable(struct intel_connector *connector);
int intel_hdcp_check_link(struct intel_connector *connector);
bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port);
bool intel_hdcp_capable(struct intel_connector *connector);
void intel_hdcp_component_init(struct drm_i915_private *dev_priv);
void intel_hdcp_component_fini(struct drm_i915_private *dev_priv);
void intel_hdcp_cleanup(struct intel_connector *connector);
void intel_hdcp_handle_cp_irq(struct intel_connector *connector);
/* intel_psr.c */
#define CAN_PSR(dev_priv) (HAS_PSR(dev_priv) && dev_priv->psr.sink_support)

73
drivers/gpu/drm/i915/intel_hdcp.c
View File

@ -74,6 +74,16 @@ bool intel_hdcp_capable(struct intel_connector *connector)
return capable;
}
static inline bool intel_hdcp_in_use(struct intel_connector *connector)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
enum port port = connector->encoder->port;
u32 reg;
reg = I915_READ(PORT_HDCP_STATUS(port));
return reg & HDCP_STATUS_ENC;
}
static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port,
const struct intel_hdcp_shim *shim)
{
@ -668,6 +678,7 @@ static int _intel_hdcp_disable(struct intel_connector *connector)
DRM_DEBUG_KMS("[%s:%d] HDCP is being disabled...\n",
connector->base.name, connector->base.base.id);
hdcp->hdcp_encrypted = false;
I915_WRITE(PORT_HDCP_CONF(port), 0);
if (intel_wait_for_register(dev_priv, PORT_HDCP_STATUS(port), ~0, 0,
ENCRYPT_STATUS_CHANGE_TIMEOUT_MS)) {
@ -713,8 +724,10 @@ static int _intel_hdcp_enable(struct intel_connector *connector)
/* Incase of authentication failures, HDCP spec expects reauth. */
for (i = 0; i < tries; i++) {
ret = intel_hdcp_auth(conn_to_dig_port(connector), hdcp->shim);
if (!ret)
if (!ret) {
hdcp->hdcp_encrypted = true;
return 0;
}
DRM_DEBUG_KMS("HDCP Auth failure (%d)\n", ret);
@ -741,16 +754,17 @@ int intel_hdcp_check_link(struct intel_connector *connector)
enum port port = intel_dig_port->base.port;
int ret = 0;
if (!hdcp->shim)
return -ENOENT;
mutex_lock(&hdcp->mutex);
if (hdcp->value == DRM_MODE_CONTENT_PROTECTION_UNDESIRED)
/* Check_link valid only when HDCP1.4 is enabled */
if (hdcp->value != DRM_MODE_CONTENT_PROTECTION_ENABLED ||
!hdcp->hdcp_encrypted) {
ret = -EINVAL;
goto out;
}
if (!(I915_READ(PORT_HDCP_STATUS(port)) & HDCP_STATUS_ENC)) {
DRM_ERROR("%s:%d HDCP check failed: link is not encrypted,%x\n",
if (WARN_ON(!intel_hdcp_in_use(connector))) {
DRM_ERROR("%s:%d HDCP link stopped encryption,%x\n",
connector->base.name, connector->base.base.id,
I915_READ(PORT_HDCP_STATUS(port)));
ret = -ENXIO;
@ -791,18 +805,6 @@ int intel_hdcp_check_link(struct intel_connector *connector)
return ret;
}
static void intel_hdcp_check_work(struct work_struct *work)
{
struct intel_hdcp *hdcp = container_of(to_delayed_work(work),
struct intel_hdcp,
check_work);
struct intel_connector *connector = intel_hdcp_to_connector(hdcp);
if (!intel_hdcp_check_link(connector))
schedule_delayed_work(&hdcp->check_work,
DRM_HDCP_CHECK_PERIOD_MS);
}
static void intel_hdcp_prop_work(struct work_struct *work)
{
struct intel_hdcp *hdcp = container_of(work, struct intel_hdcp,
@ -1120,6 +1122,18 @@ int hdcp2_deauthenticate_port(struct intel_connector *connector)
return hdcp2_close_mei_session(connector);
}
static void intel_hdcp_check_work(struct work_struct *work)
{
struct intel_hdcp *hdcp = container_of(to_delayed_work(work),
struct intel_hdcp,
check_work);
struct intel_connector *connector = intel_hdcp_to_connector(hdcp);
if (!intel_hdcp_check_link(connector))
schedule_delayed_work(&hdcp->check_work,
DRM_HDCP_CHECK_PERIOD_MS);
}
static int i915_hdcp_component_bind(struct device *i915_kdev,
struct device *mei_kdev, void *data)
{
@ -1281,7 +1295,8 @@ 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->hdcp_encrypted)
ret = _intel_hdcp_disable(connector);
}
mutex_unlock(&hdcp->mutex);
@ -1345,3 +1360,21 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
new_state->crtc);
crtc_state->mode_changed = true;
}
/* Handles the CP_IRQ raised from the DP HDCP sink */
void intel_hdcp_handle_cp_irq(struct intel_connector *connector)
{
struct intel_hdcp *hdcp = &connector->hdcp;
if (!hdcp->shim)
return;
/*
* CP_IRQ could be triggered due to 1. HDCP2.2 auth msgs availability,
* 2. link failure and 3. repeater reauth request. At present we dont
* handle the CP_IRQ for the HDCP2.2 auth msg availability for read.
* To handle other two causes for CP_IRQ we have the work_fn which is
* scheduled here.
*/
schedule_delayed_work(&hdcp->check_work, 0);
}