sata_scr_write — write SCR register of the specified port
ATA link to write SCR for
SCR to write
value to write
Write val to SCR register reg of link. This function is guaranteed to succeed if link is ap->link, the cable type of the port is SATA and the port implements ->scr_read.
None if link is ap->link. Kernel thread context otherwise.
0 on success, negative errno on failure.