linux-kernel - Re: [PATCH v2 4/5] PCI: mvebu: add support for reset on GPIO

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Message-ID: <20130814115328.GA32395@titan.lakedaemon.net>
Date:	Wed, 14 Aug 2013 07:53:28 -0400
From:	Jason Cooper <jason@...edaemon.net>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Andrew Lunn <andrew@...n.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Stephen Warren <swarren@...dotorg.org>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH v2 4/5] PCI: mvebu: add support for reset on GPIO

On Wed, Aug 14, 2013 at 11:25:02AM +0200, Sebastian Hesselbarth wrote:
> On 08/14/2013 11:07 AM, Thierry Reding wrote:
> >On Tue, Aug 13, 2013 at 02:25:23PM +0200, Sebastian Hesselbarth wrote:
> >[...]
> >>diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
> >[...]
> >>@@ -897,6 +904,30 @@ static int mvebu_pcie_probe(struct platform_device *pdev)
> >[...]
> >>+			u32 reset_udelay = 20000;
> >[...]
> >>+			udelay(reset_udelay);
> >
> >udelay(20000) is probably not a good idea. You should probably use
> >something like usleep_range() or msleep() here. Also see:
> >
> >	Documentation/timers/timers-howto.txt
> 
> Thierry,
> 
> thanks for mentioning this. I clearly got distracted from ms to us
> switch due to the different reset API convention. As the delay will
> be most likely 10ms+, we should change the above to
> msleep(reset_udelay/1000) instead.

I'll just go ahead and fix this up locally.  No need to resend.

thx,

Jason.
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