From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH] scsi: aacraid: Add a small delay after IOP reset
Date: Tue, 19 Sep 2017 08:37:12 -0700
Message-ID: <20170919153712.GA15496@infradead.org>
References: <20170919151156.29412-1-gpiccoli@linux.vnet.ibm.com>
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To: "Guilherme G. Piccoli" <gpiccoli@linux.vnet.ibm.com>
Cc: aacraid@microsemi.com, linux-scsi@vger.kernel.org, RaghavaAditya.Renukunta@microsemi.com, david.carroll@microsemi.com, brking@linux.vnet.ibm.com, dougmill@linux.vnet.ibm.com, stable@vger.kernel.org

On Tue, Sep 19, 2017 at 12:11:55PM -0300, Guilherme G. Piccoli wrote:
>  	src_writel(dev, MUnit.IDR, IOP_SRC_RESET_MASK);
> +
> +	msleep(5000);

src_writel is a writel, and thus a posted MMIO write.  You'll need
to have to a read first to make it a reliable timing base.