libata: normalize port_info, port_operations and sht tables

Over the time, port info, ops and sht structures developed quite a bit
of inconsistencies.  This patch updates drivers.

* Enable/disable_pm callbacks added to all ahci ops tables.

* Every driver for SFF controllers now uses ata_sff_port_start()
  instead of ata_port_start() unless the driver has custom
  implementation.

* Every driver for SFF controllers now uses ata_pci_default_filter()
  unless the driver has custom implementation.

* Removed an odd port_info->sht initialization from ata_piix.c.
  Likely a merge byproduct.

* A port which has ATA_FLAG_SATA set doesn't need to set cable_detect
  to ata_cable_sata().  Remove it from via and mv port ops.

* Some drivers had unnecessary .max_sectors initialization which is
  ignored and was missing .slave_destroy callback.  Fixed.

* Removed unnecessary sht initializations port_info's.

* Removed onsolete scsi device suspend/resume callbacks from
  pata_bf54x.

* No reason to set ata_pci_default_filter() and bmdma functions for
  PIO-only drivers.  Remove those callbacks and replace
  ata_bmdma_irq_clear with ata_noop_irq_clear.

* pata_platform sets port_start to ata_dummy_ret0.  port_start can
  just be set to NULL.

* sata_fsl supports NCQ but was missing qc_defer.  Fixed.

* pata_rb600_cf implements dummy port_start.  Removed.

Signed-off-by: Tejun Heo <htejun@gmail.com>

1 files changed, 0 insertions, 4 deletions

diff --git a/drivers/ata/pata_platform.c b/drivers/ata/pata_platform.c
index a8429f5c3006..602f5562d6fb 100644
--- a/drivers/ata/pata_platform.c
+++ b/drivers/ata/pata_platform.c
@@ -46,8 +46,6 @@ static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unu
         return 0;
 }
 
-static int ata_dummy_ret0(struct ata_port *ap)  { return 0; }
-
 static struct scsi_host_template pata_platform_sht = {
         .module                 = THIS_MODULE,
         .name                   = DRV_NAME,
@@ -88,8 +86,6 @@ static struct ata_port_operations pata_platform_port_ops = {
 
         .irq_clear              = ata_noop_irq_clear,
         .irq_on                 = ata_irq_on,
-
-        .port_start             = ata_dummy_ret0,
 };
 
 static void pata_platform_setup_port(struct ata_ioports *ioaddr,