* Re: [patch 3/3] ata: SWNCQ should be enabled by default
[not found] ` <15F501D1A78BD343BE8F4D8DB854566B1BFE2AF4@hkemmail01.nvidia.com>
@ 2008-04-04 7:38 ` Jeff Garzik
0 siblings, 0 replies; only message in thread
From: Jeff Garzik @ 2008-04-04 7:38 UTC (permalink / raw)
To: Kuan Luo
Cc: Robert Hancock, Tejun Heo, Zoltan Boszormenyi, akpm, linux-ide,
Peer Chen, Allen Martin, LKML
Kuan Luo wrote:
> Robert wrote:
>> -Hotplug/hot-unplug fails to work properly, hotplug interrupts not
>> raised (seemingly only on certain boards/configurations as I can't
>> duplicate this problem).
>> http://bugzilla.kernel.org/show_bug.cgi?id=8421
>>
> I occasionly encountered this problem in one port under certain system,
> but didn't see this issue under other systems in the same mainboard.
> After adding the operation of manually clearing the added/removed
> interrupt bit in NV_INT_STATUS_CK804 register
> in nv_adma_interrupt function, i saw some improvement.
>
> The key problem is that no one who knows this controller comes to help
> to solve these issue.
> Given this disadvantage, i think disabling it maybe is a good choice.
> I don't know whether we need to continue to provide patch for adma after
> disabling adma function.
Based on all these discussions and experiences, I just checked in the
following commit, setting adma_enabled to zero:
[libata] sata_nv: disable ADMA by default
Continues to have open issues, and engineering support is extremely
difficult to come by, according to fellow NVIDIA engineers.
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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