I see these popping up randomly on cyan:

2018-05-11T12:42:19.301878+02:00 INFO kernel: [  221.033629] sst-mfld-platform sst-mfld-platform: Enter: enable=1 port_name=ssp2-port
2018-05-11T12:42:19.301903+02:00 DEBUG kernel: [  221.033652] writing to lpe: 00000000: 01 01 01 01 00 00 1a 00 ff ff ff ff 75 00 12 00  ............u...
2018-05-11T12:42:19.301907+02:00 DEBUG kernel: [  221.033656] writing to lpe: 00000010: 03 00 03 00 90 00 03 ff 03 ff 03 00 00 00 10 00  ................
2018-05-11T12:42:19.301910+02:00 DEBUG kernel: [  221.033659] writing to lpe: 00000020: 01 00                                            ..
2018-05-11T12:42:19.304890+02:00 INFO kernel: [  221.036233] intel_sst_acpi 808622A8:00: Alloc for str 1 pipe 0x90
2018-05-11T12:42:19.305884+02:00 DEBUG kernel: [  221.037308] writing to lpe: 00000000: 01 02 01 01 00 00 1e 00 ff ff ff ff 82 00 16 00  ................
2018-05-11T12:42:19.305894+02:00 DEBUG kernel: [  221.037314] writing to lpe: 00000010: 82 00 12 00 03 00 01 02 04 08 10 20 40 80 01 02  ........... @...
2018-05-11T12:42:19.305897+02:00 DEBUG kernel: [  221.037317] writing to lpe: 00000020: 04 08 10 20 40 80                                ... @.
2018-05-11T12:42:19.306860+02:00 DEBUG kernel: [  221.038011] writing to lpe: 00000000: 01 02 01 01 00 00 14 00 ff ff ff ff 21 00 0c 00  ............!...
2018-05-11T12:42:19.306868+02:00 DEBUG kernel: [  221.038015] writing to lpe: 00000010: 01 00 00 02 67 00 00 00 00 00 32 00              ....g.....2.

I think the driver should use print_hex_dump_debug() and pr_debug() so that this detailed information is only logged if -DDEBUG is enabled.