Re: Celleb cannot exit from ata_host_intr()

[Albert Lee <albertcc@tw.ibm.com>]

Hi Iguchi-san,

> 
> 
>>Is the irq of Celleb IDE shared with other adapters?
>>If the irq is non-shared, could you check if the following code works
>>for Celleb:
>>
>>			/* if it's not our irq... */
>>			if ((host_stat & ATA_DMA_ACTIVE) &&
>>			    !(host_stat & ATA_DMA_INTR))
>>				goto idle_irq;
> 
> 
> My irq is non-shared, but above code doesn't work.
> I got the following register values at this point:
> - DMA_STATUS = 0x01 (ATA_DMA_ACTIVE is 1)
> - ALT_STATUS = 0x51 (ERR is 1)

Ah, I see, so the adapter thinks BMDMA is still active. :(
Wonder whether this behavior would be related to CD-ROM drive...
i.e. Does it possibly work ok with other CD-ROM models?

> 
> Now I think I should handle this problem in my bmdma_status() hook
> because it is a device specific problem.
> I intend to emulate ATA_DMA_INTR if the following conditions are true:
> - In ISR
> - ALT_STATUS[ERR] = 1
> - DMA_STATUS[DMA_ACTIVE] = 1
> 
> 

Some controller like Promise 2027x has an extra register/bit for INTRQ.
Don't know whether Celleb has such hardware bit or not. If do, maybe
such bit can be also used as substitute for bmdma:INTR.

--
albert