Re: [PATCH linux-2.6.13-rc3] SATA: rewritten sil24 driver

[Tejun Heo <htejun@gmail.com>]

 Hello, Edward.

 One more question.

> > >
> > >I think this will work (adapted from sil_interrupt():
> > >
> > >static void sil_irq_clear(struct ata_port *ap)
> > >{
> > >        struct sil_port_priv *pp = ap->private_data;
> > >        struct Port_Registers *port_base = pp->pregs;
> > >    unsigned long port_int;
> > >
> > >    port_int  = readl((void *)&port_base->IntStatus);
> > >    writel(port_int, &port_base->IntStatus);
> > >}
> > >
> > >I'm assuming that this entry point is expected to clear all interrupts, no?
> > 
> > Correct.
> > 
> 
>  I'll verify with the error register clearing part of the original
> driver and submit a patch.
> 

 Command completion interrupt is automatcally cleared by reading
PORT_SLOT_STAT register (SlotStatus in the original driver), and error
registers should be manually cleared by writing to PORT_IRQ_STAT
(IntStatus).

 I agree that above code should clear both.  Just wanna verify.  Have
you tested it and/or do you have any information confirming this?  If
we don't have any further info, I think we should read PORT_SLOT_STAT
before clearing PORT_IRQ_STAT to be on the safe side.

 Thanks.

-- 
tejun
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/