Re: [PATCH v10 14/40] drm/i915: Handle HDCP2.2 downstream topology change

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>-----Original Message-----
>From: C, Ramalingam
>Sent: Thursday, January 31, 2019 12:30 PM
>To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx;
>daniel.vetter@xxxxxxxx; Winkler, Tomas <tomas.winkler@xxxxxxxxx>; Shankar,
>Uma <uma.shankar@xxxxxxxxx>
>Cc: C, Ramalingam <ramalingam.c@xxxxxxxxx>
>Subject: [PATCH v10 14/40] drm/i915: Handle HDCP2.2 downstream topology
>change
>
>When repeater notifies a downstream topology change, this patch
>reauthenticate the repeater alone without disabling the hdcp encryption. If that
>fails then complete reauthentication is executed.
>
>v2:
>  Rebased.
>v3:
>  Typo in commit msg is fixed [Uma]
>v4:
>  Rebased as part of patch reordering.
>  Minor style fixes.
>v5:
>  Rebased.
>v6:
>  Rebased.
>v7:
>  Errors due to sinks are reported as DEBUG logs.
>
>Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
>Reviewed-by: Uma Shankar <uma.shankar@xxxxxxxxx>

The latest version is ok. You can keep the RB.

>---
> drivers/gpu/drm/i915/intel_hdcp.c | 20 ++++++++++++++++++--
> 1 file changed, 18 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/gpu/drm/i915/intel_hdcp.c
>b/drivers/gpu/drm/i915/intel_hdcp.c
>index 3feff921a547..7ff29fb0aa2f 100644
>--- a/drivers/gpu/drm/i915/intel_hdcp.c
>+++ b/drivers/gpu/drm/i915/intel_hdcp.c
>@@ -1617,8 +1617,24 @@ static int intel_hdcp2_check_link(struct
>intel_connector *connector)
> 		goto out;
> 	}
>
>-	DRM_DEBUG_KMS("[%s:%d] HDCP2.2 link failed, retrying auth\n",
>-		      connector->base.name, connector->base.base.id);
>+	if (ret == HDCP_TOPOLOGY_CHANGE) {
>+		if (hdcp->value ==
>DRM_MODE_CONTENT_PROTECTION_UNDESIRED)
>+			goto out;
>+
>+		DRM_DEBUG_KMS("HDCP2.2 Downstream topology change\n");
>+		ret = hdcp2_authenticate_repeater_topology(connector);
>+		if (!ret) {
>+			hdcp->value =
>DRM_MODE_CONTENT_PROTECTION_ENABLED;
>+			schedule_work(&hdcp->prop_work);
>+			goto out;
>+		}
>+		DRM_DEBUG_KMS("[%s:%d] Repeater topology auth
>failed.(%d)\n",
>+			      connector->base.name, connector->base.base.id,
>+			      ret);
>+	} else {
>+		DRM_DEBUG_KMS("[%s:%d] HDCP2.2 link failed, retrying
>auth\n",
>+			      connector->base.name, connector->base.base.id);
>+	}
>
> 	ret = _intel_hdcp2_disable(connector);
> 	if (ret) {
>--
>2.7.4

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