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drm/i915: Stop encryption for repeater with no sink

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If a HDCP repeater is detected with zero downstream devices,
HDCP spec approves either of below actions:

1. Dont continue on second stage authentication. Disable encryption.
2. Continue with second stage authentication excluding the KSV list and
   on success, continue encryption.

Since disable encryption is agreed, repeater is not expected to have its
own display. So there is no consumption of the display content in such
setup.

Hence, incase of repeater with zero device count, this patch fails the
HDCP authentication and stops the HDCP encryption.

v2:
  Rephrased commit msg and added comments in code [Seanpaul]

v3:
  No changes. Added Reviewed-by tag.

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/1517609350-10698-3-git-send-email-ramalingam.c@intel.com
This commit is contained in:
Ramalingam C 2018-02-03 03:39:04 +05:30 committed by Sean Paul
parent a01244967d
commit f179a2fc2e
1 changed files with 8 additions and 2 deletions
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10
drivers/gpu/drm/i915/intel_hdcp.c
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@ -166,10 +166,16 @@ int intel_hdcp_auth_downstream(struct intel_digital_port *intel_dig_port,
return -EPERM;
}
/* If there are no downstream devices, we're all done. */
/*
* When repeater reports 0 device count, HDCP1.4 spec allows disabling
* the HDCP encryption. That implies that repeater can't have its own
* display. As there is no consumption of encrypted content in the
* repeater with 0 downstream devices, we are failing the
* authentication.
*/
num_downstream = DRM_HDCP_NUM_DOWNSTREAM(bstatus[0]);
if (num_downstream == 0)
return 0;
return -EINVAL;
ksv_fifo = kzalloc(num_downstream * DRM_HDCP_KSV_LEN, GFP_KERNEL);
if (!ksv_fifo)