[Intel-gfx] [PATCH v5 16/40] drm/i915: Implement HDCP2.2 repeater authentication

[kbuild test robot]

Hi Ramalingam,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-intel/for-linux-next]
[also build test WARNING on v4.18-rc2 next-20180627]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ramalingam-C/drm-i915-Implement-HDCP2-2/20180627-174219
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

   drivers/gpu/drm/i915/i915_drv.h:3674:16: sparse: expression using sizeof(void)
>> drivers/gpu/drm/i915/intel_hdcp.c:1451:30: sparse: incorrect type in assignment (different base types) @@    expected restricted __be16 [assigned] [usertype] k @@    got e] k @@
   drivers/gpu/drm/i915/intel_hdcp.c:1451:30:    expected restricted __be16 [assigned] [usertype] k
   drivers/gpu/drm/i915/intel_hdcp.c:1451:30:    got int
   drivers/gpu/drm/i915/intel_hdcp.c:1890:6: sparse: symbol 'is_hdcp2_supported' was not declared. Should it be static?

vim +1451 drivers/gpu/drm/i915/intel_hdcp.c

  1432	
  1433	static
  1434	int hdcp2_propagate_stream_management_info(struct intel_connector *connector)
  1435	{
  1436		struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
  1437		struct intel_hdcp *hdcp = &connector->hdcp;
  1438		union {
  1439			struct hdcp2_rep_stream_manage stream_manage;
  1440			struct hdcp2_rep_stream_ready stream_ready;
  1441		} msgs;
  1442		const struct intel_hdcp_shim *shim = hdcp->hdcp_shim;
  1443		int ret;
  1444	
  1445		/* Prepare RepeaterAuth_Stream_Manage msg */
  1446		msgs.stream_manage.msg_id = HDCP_2_2_REP_STREAM_MANAGE;
  1447		reverse_endianness(msgs.stream_manage.seq_num_m, HDCP_2_2_SEQ_NUM_LEN,
  1448				   (u8 *)&hdcp->seq_num_m);
  1449	
  1450		/* K no of streams is fixed as 1. Stored as big-endian. */
> 1451		msgs.stream_manage.k = __swab16(1);
  1452	
  1453		/* For HDMI this is forced to be 0x0. For DP SST also this is 0x0. */
  1454		msgs.stream_manage.streams[0].stream_id = 0;
  1455		msgs.stream_manage.streams[0].stream_type = hdcp->content_type;
  1456	
  1457		/* Send it to Repeater */
  1458		ret = shim->write_2_2_msg(intel_dig_port, &msgs.stream_manage,
  1459					  sizeof(msgs.stream_manage));
  1460		if (ret < 0)
  1461			return ret;
  1462	
  1463		ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_REP_STREAM_READY,
  1464					 &msgs.stream_ready, sizeof(msgs.stream_ready));
  1465		if (ret < 0)
  1466			return ret;
  1467	
  1468		hdcp->mei_data.seq_num_m = hdcp->seq_num_m;
  1469		hdcp->mei_data.streams[0].stream_type = hdcp->content_type;
  1470	
  1471		ret = hdcp2_verify_mprime(connector, &msgs.stream_ready);
  1472		if (ret < 0)
  1473			return ret;
  1474	
  1475		hdcp->seq_num_m++;
  1476	
  1477		if (hdcp->seq_num_m > HDCP_2_2_SEQ_NUM_MAX) {
  1478			DRM_DEBUG_KMS("seq_num_m roll over.\n");
  1479			return -1;
  1480		}
  1481	
  1482		return 0;
  1483	}
  1484	

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