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

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Message-ID: <HK2PR0601MB1393CE3EA6A72D0F74498251F5F20@HK2PR0601MB1393.apcprd06.prod.outlook.com>
Date:	Mon, 4 Jan 2016 14:18:12 +0000
From:	Phil Edworthy <phil.edworthy@...esas.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Wolfram Sang <wsa@...-dreams.de>,
	Simon Horman <horms@...ge.net.au>,
	"Bjorn Helgaas" <bhelgaas@...gle.com>,
	"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 Geert,

On 21 December 2015 13:17, Geert Uytterhoeven wrote:
> On Mon, Dec 21, 2015 at 11:52 AM, Phil Edworthy
> <phil.edworthy@...esas.com> wrote:
> > 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?
> 
> Timers or interrupts disabled?
> 
> Does the might_sleep_if() scream if CONFIG_DEBUG_ATOMIC_SLEEP=y?
Yes, it does indeed scream. Would you recommend to still use readl_poll_timeout
with sleep_us set to 0?

Thanks
Phil