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[ARM] pata_icside: fix the FIXMEs

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Alan Cox suggested that the solution to the FIXMEs in pata_icside is
to use a private postreset method to detect the lack of devices on a
port, and in such a case, disable the interrupt for the port.

This patch implements such a method, and removes the hard coded
disable of port 0.  Tested as working.

Acked-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2007-08-06 16:10:54 +01:00 committed by Russell King
parent b8b786098b
commit eba84481c7
1 changed files with 11 additions and 17 deletions
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28
drivers/ata/pata_icside.c
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@ -330,17 +330,12 @@ static void ata_dummy_noret(struct ata_port *port)
{
}
/*
* We need to shut down unused ports to prevent spurious interrupts.
* FIXME: the libata core doesn't call this function for PATA interfaces.
*/
static void pata_icside_port_disable(struct ata_port *ap)
static void pata_icside_postreset(struct ata_port *ap, unsigned int *classes)
{
struct pata_icside_state *state = ap->host->private_data;
ata_port_printk(ap, KERN_ERR, "disabling icside port\n");
ata_port_disable(ap);
if (classes[0] != ATA_DEV_NONE || classes[1] != ATA_DEV_NONE)
return ata_std_postreset(ap, classes);
state->port[ap->port_no].disabled = 1;
@ -356,6 +351,12 @@ static void pata_icside_port_disable(struct ata_port *ap)
}
}
static void pata_icside_error_handler(struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, ata_std_prereset, ata_std_softreset, NULL,
pata_icside_postreset);
}
static u8 pata_icside_irq_ack(struct ata_port *ap, unsigned int chk_drq)
{
unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
@ -374,7 +375,7 @@ static u8 pata_icside_irq_ack(struct ata_port *ap, unsigned int chk_drq)
}
static struct ata_port_operations pata_icside_port_ops = {
.port_disable = pata_icside_port_disable,
.port_disable = ata_port_disable,
.set_dmamode = pata_icside_set_dmamode,
@ -397,7 +398,7 @@ static struct ata_port_operations pata_icside_port_ops = {
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = ata_bmdma_error_handler,
.error_handler = pata_icside_error_handler,
.post_internal_cmd = pata_icside_bmdma_stop,
.irq_clear = ata_dummy_noret,
@ -484,13 +485,6 @@ static int __devinit pata_icside_register_v6(struct pata_icside_info *info)
state->port[0].port_sel = sel;
state->port[1].port_sel = sel | 1;
/*
* FIXME: work around libata's aversion to calling port_disable.
* This permanently disables interrupts on port 0 - bad luck if
* you have a drive on that port.
*/
state->port[0].disabled = 1;
info->base = easi_base;
info->irqops = &pata_icside_ops_arcin_v6;
info->nr_ports = 2;