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| author | Evan Wang | 2018-04-13 06:32:30 +0200 |
|---|---|---|
| committer | Tejun Heo | 2018-04-26 20:25:04 +0200 |
| commit | fa89f53bd7288d6aa7a982841119e7123faf5a53 (patch) | |
| tree | edcd32381580db6a29a58a681df8ee70dd7d8a68 /drivers/ata/ahci.h | |
| parent | Revert "ata: ahci-platform: add reset control support" (diff) | |
| download | kernel-qcow2-linux-fa89f53bd7288d6aa7a982841119e7123faf5a53.tar.gz kernel-qcow2-linux-fa89f53bd7288d6aa7a982841119e7123faf5a53.tar.xz kernel-qcow2-linux-fa89f53bd7288d6aa7a982841119e7123faf5a53.zip | |
libahci: Allow drivers to override stop_engine
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: Evan 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: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata/ahci.h')
| -rw-r--r-- | drivers/ata/ahci.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h index a9d996e17d75..824bd399f02e 100644 --- a/drivers/ata/ahci.h +++ b/drivers/ata/ahci.h @@ -365,6 +365,13 @@ struct ahci_host_priv { * be overridden anytime before the host is activated. */ void (*start_engine)(struct ata_port *ap); + /* + * Optional ahci_stop_engine override, if not set this gets set to the + * default ahci_stop_engine during ahci_save_initial_config, this can + * be overridden anytime before the host is activated. + */ + int (*stop_engine)(struct ata_port *ap); + irqreturn_t (*irq_handler)(int irq, void *dev_instance); /* only required for per-port MSI(-X) support */ |