Subject: Re: sym scsi driver problem with 2.6.26 or newer debian kernel on p610 (fwd)

From: Laszlo Fekete <[email-masked]>
Date: Sat, 27 Jun 2009 19:46:29 +0200

Hello!

Thank you very much, this patch works me too.

Maybe this patch will be in the debian kernel someday?

Thank you: blackluck

Michael Ellerman wrote:
> On Wed, 2009-06-24 at 15:56 +1000, Benjamin Herrenschmidt wrote:
>   
>> On Wed, 2009-06-24 at 15:53 +1000, Michael Ellerman wrote:
>>     
>>> Doesn't fix my machine :/
>>>
>>>       
>> That doesn't make sense ... What if you remove the bit inside the ifdef
>> CONFIG_MPIC_BROKEN_REGREAD in _mpic_read() ?
>>
>> If that makes a difference, then it would be interesting to add a printk
>> in there that prints what the original value "val" is and what we have
>> in the shadow...
>>     
>
> With this patch it boots:
>
> diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
> index 2353adc..fc17289 100644
> --- a/arch/powerpc/sysdev/mpic.c
> +++ b/arch/powerpc/sysdev/mpic.c
> @@ -231,13 +231,16 @@ static inline u32 _mpic_irq_read(struct mpic *mpic, unsign
>         unsigned int    isu = src_no >> mpic->isu_shift;
>         unsigned int    idx = src_no & mpic->isu_mask;
>         unsigned int    val;
> +       unsigned int    shadow;
>  
>         val = _mpic_read(mpic->reg_type, &mpic->isus[isu],
>                          reg + (idx * MPIC_INFO(IRQ_STRIDE)));  
>  #ifdef CONFIG_MPIC_BROKEN_REGREAD
> -       if (reg == 0)
> -               val = (val & (MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY)) |
> +       if (reg == 0) {
> +               shadow = (val & (MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY)) |
>                         mpic->isu_reg0_shadow[idx];
> +               printk("%s: val 0x%x shadow 0x%x\n", __func__, val, shadow);
> +       }
>  #endif
>         return val;
>  }
>
>
> And I see:
>
> sym53c8xx 0000:00:0c.0: enabling device (0140 -> 0143)
> sym0: <896> rev 0x7 at pci 0000:00:0c.0 irq 17
> sym0: No NVRAM, ID 7, Fast-40, SE, parity checking
> _mpic_irq_read: val 0x80480004 shadow 0x80080014
> _mpic_irq_read: val 0x480004 shadow 0x480004
>
>
>
> cheers
>