[PATCH v3 24/40] 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 next-20180403]
[cannot apply to v4.16]
[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-HDCP2-2/20180404-031743
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/intel_hdcp.c:1182:30: sparse: incorrect type in assignment (different base types) @@    expected restricted __be16 [assigned] [usertype] k @@    got e] k @@
   drivers/gpu/drm/i915/intel_hdcp.c:1182:30:    expected restricted __be16 [assigned] [usertype] k
   drivers/gpu/drm/i915/intel_hdcp.c:1182:30:    got int
   drivers/gpu/drm/i915/intel_hdcp.c:1277:12: warning: 'hdcp2_authenticate_sink' defined but not used [-Wunused-function]
    static int hdcp2_authenticate_sink(struct intel_connector *connector)
               ^~~~~~~~~~~~~~~~~~~~~~~
   In file included from drivers/gpu/drm/i915/intel_hdcp.c:13:0:
   include/linux/mei_hdcp.h:148:12: warning: 'mei_cldev_unregister_notify' defined but not used [-Wunused-function]
    static int mei_cldev_unregister_notify(struct notifier_block *nb)
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/mei_hdcp.h:144:12: warning: 'mei_cldev_register_notify' defined but not used [-Wunused-function]
    static int mei_cldev_register_notify(struct notifier_block *nb)
               ^~~~~~~~~~~~~~~~~~~~~~~~~

vim +1182 drivers/gpu/drm/i915/intel_hdcp.c

  1163	
  1164	static
  1165	int hdcp2_propagate_stream_management_info(struct intel_connector *connector)
  1166	{
  1167		struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
  1168		struct intel_hdcp *hdcp = &connector->hdcp;
  1169		union {
  1170			struct hdcp2_rep_stream_manage stream_manage;
  1171			struct hdcp2_rep_stream_ready stream_ready;
  1172		} msgs;
  1173		const struct intel_hdcp_shim *shim = hdcp->hdcp_shim;
  1174		int ret;
  1175	
  1176		/* Prepare RepeaterAuth_Stream_Manage msg */
  1177		msgs.stream_manage.msg_id = HDCP_2_2_REP_STREAM_MANAGE;
  1178		reverse_endianness(msgs.stream_manage.seq_num_m, HDCP_2_2_SEQ_NUM_LEN,
  1179				   (u8 *)&hdcp->seq_num_m);
  1180	
  1181		/* K no of streams is fixed as 1. Stored as big-endian. */
> 1182		msgs.stream_manage.k = __swab16(1);
  1183	
  1184		/* For HDMI this is forced to be 0x0. For DP SST also this is 0x0. */
  1185		msgs.stream_manage.streams[0].stream_id = 0;
  1186		msgs.stream_manage.streams[0].stream_type = hdcp->content_type;
  1187	
  1188		/* Send it to Repeater */
  1189		ret = shim->write_2_2_msg(intel_dig_port, &msgs.stream_manage,
  1190					  sizeof(msgs.stream_manage));
  1191		if (ret < 0)
  1192			return ret;
  1193	
  1194		ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_REP_STREAM_READY,
  1195					 &msgs.stream_ready, sizeof(msgs.stream_ready));
  1196		if (ret < 0)
  1197			return ret;
  1198	
  1199		hdcp->mei_data.seq_num_m = hdcp->seq_num_m;
  1200		hdcp->mei_data.streams[0].stream_type = hdcp->content_type;
  1201	
  1202		ret = hdcp2_verify_mprime(hdcp,	&msgs.stream_ready);
  1203		if (ret < 0)
  1204			return ret;
  1205	
  1206		hdcp->seq_num_m++;
  1207	
  1208		if (hdcp->seq_num_m > HDCP_2_2_SEQ_NUM_MAX) {
  1209			DRM_DEBUG_KMS("seq_num_m roll over.\n");
  1210			return -1;
  1211		}
  1212		return 0;
  1213	}
  1214	

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