drm/i915: Detect panel's hdcp capability

DP HDCP1.4 spec mandates that An can be written to panel only after
detecting the panel's hdcp capability.

For DP 0th Bit of Bcaps register indicates the panel's hdcp capability
For HDMI valid BKSV indicates the panel's hdcp capability.

For HDMI it is optional to detect the panel's hdcp capability before
An Write.

v2:
  Added comments explaining the need for action [Seanpaul].
  Made panel's hdcp capability detection optional for hdmi [Seanpaul].
  Defined a func for reading bcaps for DP [Seanpaul].

v3:
  Removed the NULL initialization [Seanpaul].

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1517609350-10698-7-git-send-email-ramalingam.c@intel.com

3 files changed, 56 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 9323b3541b1e..59024c7ec2cd 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -5084,17 +5084,32 @@ static int intel_dp_hdcp_read_bstatus(struct intel_digital_port *intel_dig_port,
 }
 
 static
-int intel_dp_hdcp_repeater_present(struct intel_digital_port *intel_dig_port,
-				   bool *repeater_present)
+int intel_dp_hdcp_read_bcaps(struct intel_digital_port *intel_dig_port,
+			     u8 *bcaps)
 {
 	ssize_t ret;
-	u8 bcaps;
+
 	ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux, DP_AUX_HDCP_BCAPS,
-			       &bcaps, 1);
+			       bcaps, 1);
 	if (ret != 1) {
 		DRM_ERROR("Read bcaps from DP/AUX failed (%zd)\n", ret);
 		return ret >= 0 ? -EIO : ret;
 	}
+
+	return 0;
+}
+
+static
+int intel_dp_hdcp_repeater_present(struct intel_digital_port *intel_dig_port,
+				   bool *repeater_present)
+{
+	ssize_t ret;
+	u8 bcaps;
+
+	ret = intel_dp_hdcp_read_bcaps(intel_dig_port, &bcaps);
+	if (ret)
+		return ret;
+
 	*repeater_present = bcaps & DP_BCAPS_REPEATER_PRESENT;
 	return 0;
 }
@@ -5195,6 +5210,21 @@ bool intel_dp_hdcp_check_link(struct intel_digital_port *intel_dig_port)
 	return !(bstatus & (DP_BSTATUS_LINK_FAILURE | DP_BSTATUS_REAUTH_REQ));
 }
 
+static
+int intel_dp_hdcp_capable(struct intel_digital_port *intel_dig_port,
+			  bool *hdcp_capable)
+{
+	ssize_t ret;
+	u8 bcaps;
+
+	ret = intel_dp_hdcp_read_bcaps(intel_dig_port, &bcaps);
+	if (ret)
+		return ret;
+
+	*hdcp_capable = bcaps & DP_BCAPS_HDCP_CAPABLE;
+	return 0;
+}
+
 static const struct intel_hdcp_shim intel_dp_hdcp_shim = {
 	.write_an_aksv = intel_dp_hdcp_write_an_aksv,
 	.read_bksv = intel_dp_hdcp_read_bksv,
@@ -5206,6 +5236,7 @@ static const struct intel_hdcp_shim intel_dp_hdcp_shim = {
 	.read_v_prime_part = intel_dp_hdcp_read_v_prime_part,
 	.toggle_signalling = intel_dp_hdcp_toggle_signalling,
 	.check_link = intel_dp_hdcp_check_link,
+	.hdcp_capable = intel_dp_hdcp_capable,
 };
 
 static void intel_edp_panel_vdd_sanitize(struct intel_dp *intel_dp)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 9461777d65b4..c902be85e456 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -369,6 +369,10 @@ struct intel_hdcp_shim {
 
 	/* Ensures the link is still protected */
 	bool (*check_link)(struct intel_digital_port *intel_dig_port);
+
+	/* Detects panel's hdcp capability. This is optional for HDMI. */
+	int (*hdcp_capable)(struct intel_digital_port *intel_dig_port,
+			    bool *hdcp_capable);
 };
 
 struct intel_connector {
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index 5c8e6d1829ef..d8c0202cf0c0 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -414,12 +414,28 @@ static int intel_hdcp_auth(struct intel_digital_port *intel_dig_port,
 		u32 reg;
 		u8 shim[DRM_HDCP_RI_LEN];
 	} ri;
-	bool repeater_present;
+	bool repeater_present, hdcp_capable;
 
 	dev_priv = intel_dig_port->base.base.dev->dev_private;
 
 	port = intel_dig_port->base.port;
 
+	/*
+	 * Detects whether the display is HDCP capable. Although we check for
+	 * valid Bksv below, the HDCP over DP spec requires that we check
+	 * whether the display supports HDCP before we write An. For HDMI
+	 * displays, this is not necessary.
+	 */
+	if (shim->hdcp_capable) {
+		ret = shim->hdcp_capable(intel_dig_port, &hdcp_capable);
+		if (ret)
+			return ret;
+		if (!hdcp_capable) {
+			DRM_ERROR("Panel is not HDCP capable\n");
+			return -EINVAL;
+		}
+	}
+
 	/* Initialize An with 2 random values and acquire it */
 	for (i = 0; i < 2; i++)
 		I915_WRITE(PORT_HDCP_ANINIT(port), get_random_u32());