On Sat, Jul 14, 2007 at 08:15:59PM +0100, Russell King wrote:
> On Sat, Jul 14, 2007 at 12:54:35AM +0100, Alan Cox wrote:
> > > We need to set the IRQ enable initially so that the identity information
> > > can be read and the drive accessed etc. However, if no drives are
> > > detected on a port, there is no callback into the low level driver -
> > > the port_disable method is never called. (I believe it is with SATA.)
> >
> > No. It actually makes no sense to do so as libata is hot plug capable
> > thus the usual case is "no drives are currently detected"
> >
> > > I tried asking about this several times before the driver was merged
> > > and every time it was completely ignored.
> >
> > Provide a private postreset method thats
> >
> >
> > static void my_postreset(struct ata_port *ap, unsigned int *classes)
> > {
> > if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
> > force IRQ off [should be off anyway]
> > } else {
> > return ata_std_postreset(ap, classes);
> > }
> > }
>
> So something like this?
I never got a response on this, so it hasn't gone any further.
> diff --git a/drivers/ata/pata_icside.c b/drivers/ata/pata_icside.c
> index c791a46..91bdb01 100644
> --- a/drivers/ata/pata_icside.c
> +++ b/drivers/ata/pata_icside.c
> @@ -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;
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of:
-
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