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From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: Mike Zheng <mail2mz@gmail.com>
Cc: htejun@gmail.com, mlord@pobox.com, linux-ide@vger.kernel.org
Subject: Re: Marvel 88SE6121 driver
Date: Mon, 28 Jan 2008 18:09:10 +0300	[thread overview]
Message-ID: <479DF016.7070100@ru.mvista.com> (raw)
In-Reply-To: <7f96c8390801280622w1edf1784p6144651d3233b8ca@mail.gmail.com>

Hello.

Mike Zheng wrote:

> From PCI config space, the VENDOR_ID and DEVICE_ID are correct for my
> driver. However the PCI_COMMAND register of 88SE6121 I got is 0x7,
> which is the same as default value. Based on the document,  it has to
> be 0x0207 to enable interrupt. However I always failed to do so, the

    Bit 10 (mask 0x0200) is fast back-to-back enable, what does it have to do 
with iterrupts.

> value remains 0x7 after it is re-assigned to the new value 0x0207. So

    This means that fast back-to-back is not supported

> that I have no interrupt from PCIe as INTA. Do you have any idea on
> this issue?

    There's also bit 11 (mask 0x0400) meaning INTx emulation *disable*.

> Thanks for your help,

> Mike Zheng

MBR, Sergei

  reply	other threads:[~2008-01-28 15:08 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-28 14:22 Marvel 88SE6121 driver Mike Zheng
2008-01-28 15:09 ` Sergei Shtylyov [this message]
2008-01-28 16:49   ` Mike Zheng

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