From: Wolfram Sang <wsa@the-dreams.de>
To: Phil Edworthy <phil.edworthy@renesas.com>
Cc: Simon Horman <horms@verge.net.au>,
Bjorn Helgaas <bhelgaas@google.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
linux-sh@vger.kernel.org
Subject: Re: [PATCH v2 2/4] PCI: rcar: Support runtime PM link state L1 handling in pcie-rcar
Date: Wed, 06 Jan 2016 08:35:36 +0000 [thread overview]
Message-ID: <20160106083536.GC1525@katana> (raw)
In-Reply-To: <1451998831-27705-3-git-send-email-phil.edworthy@renesas.com>
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On Tue, Jan 05, 2016 at 01:00:29PM +0000, Phil Edworthy wrote:
> The R-Car PCIe host controller does not handle L1 ASPM. Instead, the
> hardware needs assistance to transition to L1. When the controller
> has received a PM_ENTER_L1 DLLP, we can't access a card's config regs
> until we have got it out of L1 link state. The host controller will
> handle this as long as it has also been transitioned to L1 link state.
>
> So, when attempting a config access, check to see if the card has gone
> into L1, and if so, do the same for the host controller.
>
> This is based on a patch by Hien Dang <hien.dang.eb@rvc.renesas.com>
>
> Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
> ---
> v2:
> - Use readl_poll_timeout_atomic when waiting until we are in L1.
Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
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next prev parent reply other threads:[~2016-01-06 8:35 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-05 13:00 [PATCH v2 0/4] Various R-Car PCIe patches Phil Edworthy
2016-01-05 13:00 ` [PATCH v2 1/4] PCI: rcar: remove unused pci_sys_data structure in pcie-rcar Phil Edworthy
2016-01-08 1:50 ` Simon Horman
2016-01-08 21:06 ` Bjorn Helgaas
2016-01-11 11:23 ` Phil Edworthy
2016-01-05 13:00 ` [PATCH v2 2/4] PCI: rcar: Support runtime PM link state L1 handling " Phil Edworthy
2016-01-06 8:35 ` Wolfram Sang [this message]
2016-01-08 21:31 ` Bjorn Helgaas
2016-01-11 11:42 ` Phil Edworthy
2016-01-13 16:58 ` Phil Edworthy
2016-01-05 13:00 ` [PATCH v2 3/4] PCI: rcar: Add runtime PM support to pcie-rcar Phil Edworthy
2016-01-06 8:35 ` Wolfram Sang
2016-01-06 8:45 ` Geert Uytterhoeven
2016-01-06 8:50 ` Wolfram Sang
2016-01-05 13:00 ` [PATCH v2 4/4] PCI: rcar: Add Gen2 PHY setup " Phil Edworthy
2016-01-06 8:39 ` Wolfram Sang
2016-01-11 14:48 ` [PATCH v2 0/4] Various R-Car PCIe patches Bjorn Helgaas
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