[PATCH v3 28/40] drm/i915: Handle HDCP2.2 downstream topology change

[Shankar, Uma]

>-----Original Message-----
>From: dri-devel [mailto:dri-devel-bounces at lists.freedesktop.org] On Behalf Of
>Ramalingam C
>Sent: Tuesday, April 3, 2018 7:28 PM
>To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org;
>seanpaul at chromium.org; daniel at ffwll.ch; chris at chris-wilson.co.uk;
>jani.nikula at linux.intel.com; Winkler, Tomas <tomas.winkler at intel.com>;
>Usyskin, Alexander <alexander.usyskin at intel.com>
>Cc: Vivi, Rodrigo <rodrigo.vivi at intel.com>
>Subject: [PATCH v3 28/40] drm/i915: Handle HDCP2.2 downstream topology
>change
>
>When repeater notifies a downstream topology change, this patch
>reauthenticate the repeater alone with out disabling the hdcp encryption. If that

Don’t leave a space b/w with and out. 

With that fix.
Reviewed-by: Uma Shankar <uma.shankar at intel.com>

>fails then complete reauthentication is executed.
>
>v2:
>  Rebased.
>v3:
>  No Changes.
>
>Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
>---
> drivers/gpu/drm/i915/intel_hdcp.c | 19 +++++++++++++++++--
> 1 file changed, 17 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/gpu/drm/i915/intel_hdcp.c
>b/drivers/gpu/drm/i915/intel_hdcp.c
>index e2aec73aefe3..fd30e2b1ddc3 100644
>--- a/drivers/gpu/drm/i915/intel_hdcp.c
>+++ b/drivers/gpu/drm/i915/intel_hdcp.c
>@@ -1497,8 +1497,23 @@ static int intel_hdcp2_check_link(struct
>intel_connector *connector)
> 		goto out;
> 	}
>
>-	DRM_INFO("[%s:%d] HDCP2.2 link failed, retrying authentication\n",
>-		 connector->base.name, connector->base.base.id);
>+	if (ret == DRM_HDCP_TOPOLOGY_CHANGE) {
>+		if (hdcp->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->hdcp_value =
>DRM_MODE_CONTENT_PROTECTION_ENABLED;
>+			schedule_work(&hdcp->hdcp_prop_work);
>+			goto out;
>+		}
>+		DRM_ERROR("[%s:%d] Repeater topology auth failed.(%d)\n",
>+			  connector->base.name, connector->base.base.id, ret);
>+	} else {
>+		DRM_ERROR("[%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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