[PATCH v6 07/18] drm/i915/hdcp: HDCP stream encryption support
Anshuman Gupta
anshuman.gupta at intel.com
Thu Nov 26 07:37:11 UTC 2020
Both HDCP_{1.x,2.x} requires to select/deselect Multistream HDCP bit
in TRANS_DDI_FUNC_CTL in order to enable/disable stream HDCP
encryption over DP MST Transport Link.
HDCP 1.4 stream encryption requires to validate the stream encryption
status in HDCP_STATUS_{TRANSCODER,PORT} register driving that link
in order to enable/disable the stream encryption.
Both of above requirement are same for all Gen with respect to
B.Spec Documentation.
v2:
- Cosmetic changes function name, error msg print and
stream typo fixes. [Uma]
v3:
- uniformity for connector detail in DMESG. [Ram]
Cc: Ramalingam C <ramalingam.c at intel.com>
Reviewed-by: Uma Shankar <uma.shankar at intel.com>
Reviewed-by: Ramalingam C <ramalingam.c at intel.com>
Tested-by: Karthik B S <karthik.b.s at intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
---
drivers/gpu/drm/i915/display/intel_ddi.c | 10 +--
drivers/gpu/drm/i915/display/intel_ddi.h | 6 +-
.../drm/i915/display/intel_display_types.h | 4 +
drivers/gpu/drm/i915/display/intel_dp_hdcp.c | 90 ++++++++++++++++---
drivers/gpu/drm/i915/display/intel_hdmi.c | 14 +--
drivers/gpu/drm/i915/i915_reg.h | 1 +
6 files changed, 97 insertions(+), 28 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index a5a66f4346bc..8a62fdaea588 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -2029,9 +2029,9 @@ void intel_ddi_disable_transcoder_func(const struct intel_crtc_state *crtc_state
}
}
-int intel_ddi_toggle_hdcp_signalling(struct intel_encoder *intel_encoder,
- enum transcoder cpu_transcoder,
- bool enable)
+int intel_ddi_toggle_hdcp_bits(struct intel_encoder *intel_encoder,
+ enum transcoder cpu_transcoder,
+ bool enable, u32 hdcp_mask)
{
struct drm_device *dev = intel_encoder->base.dev;
struct drm_i915_private *dev_priv = to_i915(dev);
@@ -2046,9 +2046,9 @@ int intel_ddi_toggle_hdcp_signalling(struct intel_encoder *intel_encoder,
tmp = intel_de_read(dev_priv, TRANS_DDI_FUNC_CTL(cpu_transcoder));
if (enable)
- tmp |= TRANS_DDI_HDCP_SIGNALLING;
+ tmp |= hdcp_mask;
else
- tmp &= ~TRANS_DDI_HDCP_SIGNALLING;
+ tmp &= ~hdcp_mask;
intel_de_write(dev_priv, TRANS_DDI_FUNC_CTL(cpu_transcoder), tmp);
intel_display_power_put(dev_priv, intel_encoder->power_domain, wakeref);
return ret;
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.h b/drivers/gpu/drm/i915/display/intel_ddi.h
index dcc711cfe4fe..a4dd815c0000 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.h
+++ b/drivers/gpu/drm/i915/display/intel_ddi.h
@@ -50,9 +50,9 @@ u32 bxt_signal_levels(struct intel_dp *intel_dp,
const struct intel_crtc_state *crtc_state);
u32 ddi_signal_levels(struct intel_dp *intel_dp,
const struct intel_crtc_state *crtc_state);
-int intel_ddi_toggle_hdcp_signalling(struct intel_encoder *intel_encoder,
- enum transcoder cpu_transcoder,
- bool enable);
+int intel_ddi_toggle_hdcp_bits(struct intel_encoder *intel_encoder,
+ enum transcoder cpu_transcoder,
+ bool enable, u32 hdcp_mask);
void icl_sanitize_encoder_pll_mapping(struct intel_encoder *encoder);
#endif /* __INTEL_DDI_H__ */
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 59f3e6d64af8..ca8258483d5e 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -339,6 +339,10 @@ struct intel_hdcp_shim {
enum transcoder cpu_transcoder,
bool enable);
+ /* Enable/Disable stream encryption on DP MST Transport Link */
+ int (*stream_encryption)(struct intel_connector *connector,
+ bool enable);
+
/* Ensures the link is still protected */
bool (*check_link)(struct intel_digital_port *dig_port,
struct intel_connector *connector);
diff --git a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
index 03424d20e9f7..94c5462fa037 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
@@ -16,6 +16,30 @@
#include "intel_dp.h"
#include "intel_hdcp.h"
+static unsigned int transcoder_to_stream_enc_status(enum transcoder cpu_transcoder)
+{
+ u32 stream_enc_mask;
+
+ switch (cpu_transcoder) {
+ case TRANSCODER_A:
+ stream_enc_mask = HDCP_STATUS_STREAM_A_ENC;
+ break;
+ case TRANSCODER_B:
+ stream_enc_mask = HDCP_STATUS_STREAM_B_ENC;
+ break;
+ case TRANSCODER_C:
+ stream_enc_mask = HDCP_STATUS_STREAM_C_ENC;
+ break;
+ case TRANSCODER_D:
+ stream_enc_mask = HDCP_STATUS_STREAM_D_ENC;
+ break;
+ default:
+ stream_enc_mask = 0;
+ }
+
+ return stream_enc_mask;
+}
+
static void intel_dp_hdcp_wait_for_cp_irq(struct intel_hdcp *hdcp, int timeout)
{
long ret;
@@ -622,24 +646,57 @@ static const struct intel_hdcp_shim intel_dp_hdcp_shim = {
};
static int
-intel_dp_mst_hdcp_toggle_signalling(struct intel_digital_port *dig_port,
- enum transcoder cpu_transcoder,
- bool enable)
+intel_dp_mst_toggle_hdcp_stream_select(struct intel_connector *connector,
+ bool enable)
{
- struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
+ struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
+ struct drm_i915_private *i915 = to_i915(connector->base.dev);
+ struct intel_hdcp *hdcp = &connector->hdcp;
int ret;
- if (!enable)
- usleep_range(6, 60); /* Bspec says >= 6us */
-
- ret = intel_ddi_toggle_hdcp_signalling(&dig_port->base,
- cpu_transcoder, enable);
+ ret = intel_ddi_toggle_hdcp_bits(&dig_port->base,
+ hdcp->stream_transcoder, enable,
+ TRANS_DDI_HDCP_SELECT);
if (ret)
- drm_dbg_kms(&i915->drm, "%s HDCP signalling failed (%d)\n",
- enable ? "Enable" : "Disable", ret);
+ drm_err(&i915->drm, "%s HDCP stream select failed (%d)\n",
+ enable ? "Enable" : "Disable", ret);
return ret;
}
+static int
+intel_dp_mst_hdcp_stream_encryption(struct intel_connector *connector,
+ bool enable)
+{
+ struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
+ struct drm_i915_private *i915 = to_i915(connector->base.dev);
+ struct intel_hdcp *hdcp = &connector->hdcp;
+ enum port port = dig_port->base.port;
+ enum transcoder cpu_transcoder = hdcp->stream_transcoder;
+ u32 stream_enc_status;
+ int ret;
+
+ ret = intel_dp_mst_toggle_hdcp_stream_select(connector, enable);
+ if (ret)
+ return ret;
+
+ stream_enc_status = transcoder_to_stream_enc_status(cpu_transcoder);
+ if (!stream_enc_status)
+ return -EINVAL;
+
+ /* Wait for encryption confirmation */
+ if (intel_de_wait_for_register(i915,
+ HDCP_STATUS(i915, cpu_transcoder, port),
+ stream_enc_status,
+ enable ? stream_enc_status : 0,
+ HDCP_ENCRYPT_STATUS_CHANGE_TIMEOUT_MS)) {
+ drm_err(&i915->drm, "Timed out waiting for transcoder: %s stream encryption %s\n",
+ transcoder_name(cpu_transcoder), enable ? "enabled" : "disabled");
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
static
bool intel_dp_mst_hdcp_check_link(struct intel_digital_port *dig_port,
struct intel_connector *connector)
@@ -656,11 +713,15 @@ bool intel_dp_mst_hdcp_check_link(struct intel_digital_port *dig_port,
connector->port, &reply);
if (ret) {
drm_dbg_kms(&i915->drm,
- "[CONNECTOR:%d:%s] failed QSES ret=%d\n",
- connector->base.base.id, connector->base.name, ret);
+ "[%s:%d] failed QSES ret=%d\n",
+ connector->base.name, connector->base.base.id, ret);
return false;
}
+ drm_dbg_kms(&i915->drm, "[%s:%d] QSES stream auth: %d stream enc: %d\n",
+ connector->base.name, connector->base.base.id,
+ reply.auth_completed, reply.encryption_enabled);
+
return reply.auth_completed && reply.encryption_enabled;
}
@@ -673,7 +734,8 @@ static const struct intel_hdcp_shim intel_dp_mst_hdcp_shim = {
.read_ksv_ready = intel_dp_hdcp_read_ksv_ready,
.read_ksv_fifo = intel_dp_hdcp_read_ksv_fifo,
.read_v_prime_part = intel_dp_hdcp_read_v_prime_part,
- .toggle_signalling = intel_dp_mst_hdcp_toggle_signalling,
+ .toggle_signalling = intel_dp_hdcp_toggle_signalling,
+ .stream_encryption = intel_dp_mst_hdcp_stream_encryption,
.check_link = intel_dp_mst_hdcp_check_link,
.hdcp_capable = intel_dp_hdcp_capable,
diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 82674a8853c6..8c8205d1b8dd 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -1495,15 +1495,16 @@ static int kbl_repositioning_enc_en_signal(struct intel_connector *connector,
usleep_range(25, 50);
}
- ret = intel_ddi_toggle_hdcp_signalling(&dig_port->base, cpu_transcoder,
- false);
+ ret = intel_ddi_toggle_hdcp_bits(&dig_port->base, cpu_transcoder,
+ false, TRANS_DDI_HDCP_SIGNALLING);
if (ret) {
drm_err(&dev_priv->drm,
"Disable HDCP signalling failed (%d)\n", ret);
return ret;
}
- ret = intel_ddi_toggle_hdcp_signalling(&dig_port->base, cpu_transcoder,
- true);
+
+ ret = intel_ddi_toggle_hdcp_bits(&dig_port->base, cpu_transcoder,
+ true, TRANS_DDI_HDCP_SIGNALLING);
if (ret) {
drm_err(&dev_priv->drm,
"Enable HDCP signalling failed (%d)\n", ret);
@@ -1526,8 +1527,9 @@ int intel_hdmi_hdcp_toggle_signalling(struct intel_digital_port *dig_port,
if (!enable)
usleep_range(6, 60); /* Bspec says >= 6us */
- ret = intel_ddi_toggle_hdcp_signalling(&dig_port->base, cpu_transcoder,
- enable);
+ ret = intel_ddi_toggle_hdcp_bits(&dig_port->base,
+ cpu_transcoder, enable,
+ TRANS_DDI_HDCP_SIGNALLING);
if (ret) {
drm_err(&dev_priv->drm, "%s HDCP signalling failed (%d)\n",
enable ? "Enable" : "Disable", ret);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 5375b219cc3b..c8e5853731c4 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -9960,6 +9960,7 @@ enum skl_power_gate {
#define TRANS_DDI_DP_VC_PAYLOAD_ALLOC (1 << 8)
#define TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE (1 << 7)
#define TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ (1 << 6)
+#define TRANS_DDI_HDCP_SELECT REG_BIT(5)
#define TRANS_DDI_BFI_ENABLE (1 << 4)
#define TRANS_DDI_HIGH_TMDS_CHAR_RATE (1 << 4)
#define TRANS_DDI_HDMI_SCRAMBLING (1 << 0)
--
2.26.2
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