net: ipa: extend endpoints in packet init command

The IP_PACKET_INIT immediate command defines the destination
endpoint to which a packet should be sent.  Prior to IPA v5.0, a
5 bit field in that command represents the endpoint, but starting
with IPA v5.0, the field is extended to 8 bits to support more than
32 endpoints.

Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ipa/ipa_cmd.c

@@ -94,11 +94,11 @@ struct ipa_cmd_register_write {
 /* IPA_CMD_IP_PACKET_INIT */
 
 struct ipa_cmd_ip_packet_init {
-	u8 dest_endpoint;
+	u8 dest_endpoint;	/* Full 8 bits used for IPA v5.0+ */
 	u8 reserved[7];
 };
 
-/* Field masks for ipa_cmd_ip_packet_init dest_endpoint field */
+/* Field mask for ipa_cmd_ip_packet_init dest_endpoint field (unused v5.0+) */
 #define IPA_PACKET_INIT_DEST_ENDPOINT_FMASK		GENMASK(4, 0)
 
 /* IPA_CMD_DMA_SHARED_MEM */
@@ -491,8 +491,13 @@ static void ipa_cmd_ip_packet_init_add(struct gsi_trans *trans, u8 endpoint_id)
 	cmd_payload = ipa_cmd_payload_alloc(ipa, &payload_addr);
 	payload = &cmd_payload->ip_packet_init;
 
-	payload->dest_endpoint = u8_encode_bits(endpoint_id,
-					IPA_PACKET_INIT_DEST_ENDPOINT_FMASK);
+	if (ipa->version < IPA_VERSION_5_0) {
+		payload->dest_endpoint =
+			u8_encode_bits(endpoint_id,
+				       IPA_PACKET_INIT_DEST_ENDPOINT_FMASK);
+	} else {
+		payload->dest_endpoint = endpoint_id;
+	}
 
 	gsi_trans_cmd_add(trans, payload, sizeof(*payload), payload_addr,
 			  opcode);