linux-kernel - RE: [PATCH 2/4] PCI: rcar: Support runtime PM link state L1 handling in pcie-rcar

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Message-ID: <KL1PR06MB1174165C6112327548CD29DDF5E40@KL1PR06MB1174.apcprd06.prod.outlook.com>
Date:	Mon, 21 Dec 2015 10:52:37 +0000
From:	Phil Edworthy <phil.edworthy@...esas.com>
To:	Wolfram Sang <wsa@...-dreams.de>
CC:	Simon Horman <horms@...ge.net.au>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>
Subject: RE: [PATCH 2/4] PCI: rcar: Support runtime PM link state L1 handling
 in pcie-rcar

Hi Wolfram,

On 18 December 2015 14:04, Wolfram Sang wrote:
> > Since the hardware doesn't support hot plug, I believe this loop will
> > always exit very quickly. Unless someone has taken a hammer to the HW
> > of course.
> 
> I know what you mean. But since readl_poll_timeout() makes it easy, we
> should better be safe than sorry.
Hmm, I changed the code, but now it doesn't come out of suspend unless
sleep_us passed to readl_poll_timeout is 0. Any reason you can think of?

To test, I am just using:
Build the kernel with CONFIG_PM_DEBUG. 
echo platform > /sys/power/pm_test
echo N > /sys/module/printk/parameters/console_suspend
echo mem > /sys/power/state

Thanks
Phil
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