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sata_via: load DEVICE register when CTL changes

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VIA controllers clear DEVICE register when IEN changes.  Make sure
DEVICE is updated along with CTL.

This change is separated from Joseph Chan's larger patch.

  http://thread.gmane.org/gmane.linux.kernel.commits.mm/40640

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Joseph Chan <JosephChan@via.com.tw>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2008-10-22 00:45:57 +09:00 committed by Jeff Garzik
parent 816ab89782
commit b78152e9db
1 changed files with 32 additions and 3 deletions
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35
drivers/ata/sata_via.c
View file

@ -70,6 +70,7 @@ enum {
static int svia_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
static int svia_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
static int svia_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
static void svia_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
static void svia_noop_freeze(struct ata_port *ap);
static int vt6420_prereset(struct ata_link *link, unsigned long deadline);
static int vt6421_pata_cable_detect(struct ata_port *ap);
@ -103,21 +104,26 @@ static struct scsi_host_template svia_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
static struct ata_port_operations vt6420_sata_ops = {
static struct ata_port_operations svia_base_ops = {
.inherits = &ata_bmdma_port_ops,
.sff_tf_load = svia_tf_load,
};
static struct ata_port_operations vt6420_sata_ops = {
.inherits = &svia_base_ops,
.freeze = svia_noop_freeze,
.prereset = vt6420_prereset,
};
static struct ata_port_operations vt6421_pata_ops = {
.inherits = &ata_bmdma_port_ops,
.inherits = &svia_base_ops,
.cable_detect = vt6421_pata_cable_detect,
.set_piomode = vt6421_set_pio_mode,
.set_dmamode = vt6421_set_dma_mode,
};
static struct ata_port_operations vt6421_sata_ops = {
.inherits = &ata_bmdma_port_ops,
.inherits = &svia_base_ops,
.scr_read = svia_scr_read,
.scr_write = svia_scr_write,
};
@ -168,6 +174,29 @@ static int svia_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
return 0;
}
/**
* svia_tf_load - send taskfile registers to host controller
* @ap: Port to which output is sent
* @tf: ATA taskfile register set
*
* Outputs ATA taskfile to standard ATA host controller.
*
* This is to fix the internal bug of via chipsets, which will
* reset the device register after changing the IEN bit on ctl
* register.
*/
static void svia_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
{
struct ata_taskfile ttf;
if (tf->ctl != ap->last_ctl) {
ttf = *tf;
ttf.flags |= ATA_TFLAG_DEVICE;
tf = &ttf;
}
ata_sff_tf_load(ap, tf);
}
static void svia_noop_freeze(struct ata_port *ap)
{
/* Some VIA controllers choke if ATA_NIEN is manipulated in