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drm/i915: dont retry stream management at seq_num_m roll over

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When roll over detected for seq_num_m, we shouldn't continue with stream
management with rolled over value.

So we are terminating the stream management retry, on roll over of the
seq_num_m.

v2:
  using drm_dbg_kms instead of DRM_DEBUG_KMS [Anshuman]
v3:
  dev_priv is used as i915 [JaniN]
v4:
  roll over is detected at the start of the stream management.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Anshuman Gupta <anshuman.gupta@intel.com> [v3]
Tested-by: Anshuman Gupta <anshuman.gupta@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200923132435.17039-3-anshuman.gupta@intel.com
This commit is contained in:
Ramalingam C 2020-09-23 18:54:35 +05:30
parent cb88d1fac1
commit bff88b1c8f
1 changed files with 10 additions and 5 deletions
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15
drivers/gpu/drm/i915/display/intel_hdcp.c
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@ -1448,7 +1448,6 @@ static
int _hdcp2_propagate_stream_management_info(struct intel_connector *connector)
{
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;
union {
struct hdcp2_rep_stream_manage stream_manage;
@ -1457,6 +1456,9 @@ int _hdcp2_propagate_stream_management_info(struct intel_connector *connector)
const struct intel_hdcp_shim *shim = hdcp->shim;
int ret;
if (connector->hdcp.seq_num_m > HDCP_2_2_SEQ_NUM_MAX)
return -ERANGE;
/* Prepare RepeaterAuth_Stream_Manage msg */
msgs.stream_manage.msg_id = HDCP_2_2_REP_STREAM_MANAGE;
drm_hdcp_cpu_to_be24(msgs.stream_manage.seq_num_m, hdcp->seq_num_m);
@ -1485,10 +1487,6 @@ int _hdcp2_propagate_stream_management_info(struct intel_connector *connector)
out:
hdcp->seq_num_m++;
if (hdcp->seq_num_m > HDCP_2_2_SEQ_NUM_MAX) {
drm_dbg_kms(&i915->drm, "seq_num_m roll over.\n");
return -ERANGE;
}
return ret;
}
@ -1699,6 +1697,13 @@ hdcp2_propagate_stream_management_info(struct intel_connector *connector)
if (!ret)
break;
/* Lets restart the auth incase of seq_num_m roll over */
if (connector->hdcp.seq_num_m > HDCP_2_2_SEQ_NUM_MAX) {
drm_dbg_kms(&i915->drm,
"seq_num_m roll over.(%d)\n", ret);
break;
}
drm_dbg_kms(&i915->drm,
"HDCP2 stream management %d of %d Failed.(%d)\n",
i + 1, tries, ret);