• Evan Wang's avatar
    libahci: Allow drivers to override stop_engine · fa89f53b
    Evan Wang authored
    Marvell armada37xx, armada7k and armada8k share the same
    AHCI sata controller IP, and currently there is an issue
    (Errata Ref#226)that the SATA can not be detected via SATA
    Port-MultiPlayer(PMP). After debugging, the reason is
    found that the value of Port-x FIS-based Switching Control
    (PxFBS@0x40) became wrong.
    According to design, the bits[11:8, 0] of register PxFBS
    are cleared when Port Command and Status (0x18) bit[0]
    changes its value from 1 to 0, i.e. falling edge of Port
    Command and Status bit[0] sends PULSE that resets PxFBS
    bits[11:8; 0].
    So it needs save the port PxFBS register before PxCMD
    ST write and restore the port PxFBS register afterwards
    in ahci_stop_engine().
    
    This commit allows drivers to override ahci_stop_engine
    behavior for use by the Marvell AHCI driver(and potentially
    other drivers in the future).
    Signed-off-by: default avatarEvan Wang <xswang@marvell.com>
    Cc: Ofer Heifetz <oferh@marvell.com>
    Cc: Tejun Heo <tj@kernel.org>
    Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
    Signed-off-by: default avatarTejun Heo <tj@kernel.org>
    fa89f53b
ahci.h 16.8 KB