drm: generic fn converting be24 to cpu and vice versa

Existing functions for converting a 3bytes(be24) of big endian value
into u32 of little endian and vice versa are renamed as

s/drm_hdcp2_seq_num_to_u32/drm_hdcp_be24_to_cpu
s/drm_hdcp2_u32_to_seq_num/drm_hdcp_cpu_to_be24
Signed-off-by: NRamalingam C <ramalingam.c@intel.com>
Suggested-by: NDaniel Vetter <daniel@ffwll.ch>
cc: Tomas Winkler <tomas.winkler@intel.com>
Acked-by: NDave Airlie <airlied@gmail.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190507162745.25600-4-ramalingam.c@intel.com

drivers/gpu/drm/i915/intel_hdcp.c

@@ -1305,7 +1305,7 @@ int hdcp2_propagate_stream_management_info(struct intel_connector *connector)
 
 	/* Prepare RepeaterAuth_Stream_Manage msg */
 	msgs.stream_manage.msg_id = HDCP_2_2_REP_STREAM_MANAGE;
-	drm_hdcp2_u32_to_seq_num(msgs.stream_manage.seq_num_m, hdcp->seq_num_m);
+	drm_hdcp_cpu_to_be24(msgs.stream_manage.seq_num_m, hdcp->seq_num_m);
 
 	/* K no of streams is fixed as 1. Stored as big-endian. */
 	msgs.stream_manage.k = cpu_to_be16(1);
@@ -1370,7 +1370,8 @@ int hdcp2_authenticate_repeater_topology(struct intel_connector *connector)
 	}
 
 	/* Converting and Storing the seq_num_v to local variable as DWORD */
-	seq_num_v = drm_hdcp2_seq_num_to_u32(msgs.recvid_list.seq_num_v);
+	seq_num_v =
+		drm_hdcp_be24_to_cpu((const u8 *)msgs.recvid_list.seq_num_v);
 
 	if (seq_num_v < hdcp->seq_num_v) {
 		/* Roll over of the seq_num_v from repeater. Reauthenticate. */

drivers/misc/mei/hdcp/mei_hdcp.c

@@ -576,7 +576,7 @@ static int mei_hdcp_verify_mprime(struct device *dev,
 
 	memcpy(verify_mprime_in.m_prime, stream_ready->m_prime,
 	       HDCP_2_2_MPRIME_LEN);
-	drm_hdcp2_u32_to_seq_num(verify_mprime_in.seq_num_m, data->seq_num_m);
+	drm_hdcp_cpu_to_be24(verify_mprime_in.seq_num_m, data->seq_num_m);
 	memcpy(verify_mprime_in.streams, data->streams,
 	       (data->k * sizeof(struct hdcp2_streamid_type)));
 

include/drm/drm_hdcp.h

@@ -252,13 +252,13 @@ struct hdcp2_rep_stream_ready {
  * host format and back
  */
 static inline
-u32 drm_hdcp2_seq_num_to_u32(u8 seq_num[HDCP_2_2_SEQ_NUM_LEN])
+u32 drm_hdcp_be24_to_cpu(const u8 seq_num[HDCP_2_2_SEQ_NUM_LEN])
 {
 	return (u32)(seq_num[2] | seq_num[1] << 8 | seq_num[0] << 16);
 }
 
 static inline
-void drm_hdcp2_u32_to_seq_num(u8 seq_num[HDCP_2_2_SEQ_NUM_LEN], u32 val)
+void drm_hdcp_cpu_to_be24(u8 seq_num[HDCP_2_2_SEQ_NUM_LEN], u32 val)
 {
 	seq_num[0] = val >> 16;
 	seq_num[1] = val >> 8;