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From: Sergei Shtylyov <sshtylyov@mvista.com>
To: Manuel Lauss <manuel.lauss@googlemail.com>
Cc: Linux-MIPS <linux-mips@linux-mips.org>
Subject: Re: [PATCH] MIPS: DB1200: Set Config_OD for improved stability.
Date: Thu, 10 Feb 2011 21:25:37 +0300	[thread overview]
Message-ID: <4D542DA1.5020705@mvista.com> (raw)
In-Reply-To: <4D542B1D.1060407@mvista.com>

I wrote:

>> Setting Config_OD gets rid of a _LOT_ of spurious CPLD interrupts,
>> but also decreases overall performance a bit.

>> Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
> [...]

>> diff --git a/arch/mips/alchemy/devboards/db1200/setup.c 
>> b/arch/mips/alchemy/devboards/db1200/setup.c
>> index 8876195..a3729c9 100644
>> --- a/arch/mips/alchemy/devboards/db1200/setup.c
>> +++ b/arch/mips/alchemy/devboards/db1200/setup.c
>> @@ -23,6 +23,13 @@ void __init board_setup(void)
>>      unsigned long freq0, clksrc, div, pfc;
>>      unsigned short whoami;
>>  
>> +    /* Set Config_OD (disable overlapping bus transaction):

>    The bit is called Config[OD] by other Alchemy code.
>    You just should add your Au1200 revision to 
> au1xxx_cpu_needs_config_od() in <asm/mach-au1x00.h> so that 
> plat_mem_setup() automatically sets the bit (just after it calls 
> board_setup()); Au1200 rev. AC should have it set already...

    Forgot to add that if you don't do it, the code in plat_mem_setup() will 
clear the bit after you've set it.

WBR, Sergei

  reply	other threads:[~2011-02-10 18:27 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-10 14:17 [PATCH RESEND] MIPS: Alchemy: update inlinable GPIO API Manuel Lauss
2011-02-10 14:17 ` [PATCH] MIPS: DB1200: Set Config_OD for improved stability Manuel Lauss
2011-02-10 18:14   ` Sergei Shtylyov
2011-02-10 18:25     ` Sergei Shtylyov [this message]
2011-02-10 14:17 ` [PATCH] Alchemy: irq: replace au_readl/writel accessors Manuel Lauss

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