From: Kishon Vijay Abraham I <kishon@ti.com>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
Rob Herring <robh+dt@kernel.org>, <linux-omap@vger.kernel.org>,
<linux-pci@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <nsekhar@ti.com>,
Shawn Lin <shawn.lin@rock-chips.com>
Subject: Re: [PATCH 3/4] PCI: dra7xx: Add support to force RC to work in GEN1 mode
Date: Wed, 16 Nov 2016 22:14:00 +0530 [thread overview]
Message-ID: <dda43649-0afd-2bd0-33ba-c95067104244@ti.com> (raw)
In-Reply-To: <20161114212400.GA19092@bhelgaas-glaptop.roam.corp.google.com>
Hi Bjorn,
On Tuesday 15 November 2016 02:54 AM, Bjorn Helgaas wrote:
> [+cc Shawn]
>
> On Sat, Nov 12, 2016 at 12:40:10PM +0530, Kishon Vijay Abraham I wrote:
>> Hi,
>>
>> On Saturday 12 November 2016 02:45 AM, Bjorn Helgaas wrote:
>>> Hi Kishon,
>>>
>>> On Tue, Oct 11, 2016 at 06:28:34PM +0530, Kishon Vijay Abraham I wrote:
>>>> PCIe in AM57x/DRA7x devices is by default
>>>> configured to work in GEN2 mode. However there
>>>> may be situations when working in GEN1 mode is
>>>> desired. One example is limitation i925 (PCIe GEN2
>>>> mode not supported at junction temperatures < 0C).
>>>>
>>>> Add support to force Root Complex to work in GEN1
>>>> mode if so desired, but don't force GEN1 mode on
>>>> any board just yet.
>>>>
>>>> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
>>>> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
>>>> ---
>>>> Documentation/devicetree/bindings/pci/ti-pci.txt | 1 +
>>>> drivers/pci/host/pci-dra7xx.c | 27 ++++++++++++++++++++++
>>>> 2 files changed, 28 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/pci/ti-pci.txt b/Documentation/devicetree/bindings/pci/ti-pci.txt
>>>> index 60e2516..a3d6ca3 100644
>>>> --- a/Documentation/devicetree/bindings/pci/ti-pci.txt
>>>> +++ b/Documentation/devicetree/bindings/pci/ti-pci.txt
>>>> @@ -25,6 +25,7 @@ PCIe Designware Controller
>>>>
>>>> Optional Property:
>>>> - gpios : Should be added if a gpio line is required to drive PERST# line
>>>> + - ti,pcie-is-gen1 : Force the PCIe controller to work in GEN1 (2.5 GT/s).
>>>
>>> Can we use "max-link-speed" so it's similar to imx6?
>>
>> yeah, maybe we should make it a generic PCI property?
>
> I forgot that Shawn has already done this! I had already merged those
> patches on pci/host-rockchip, but I moved them to pci/host since
> they're not Rockchip-specific. Can you take a look at that and see if
> you can do what you need based on that pci/host branch?
Sure, I'll look at that on Monday when I'm back from vacation.
Cheers
Kishon
next prev parent reply other threads:[~2016-11-16 16:44 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-11 12:58 [PATCH 0/4] PCI: designware/dra7xx: misc fixes and cleanups Kishon Vijay Abraham I
2016-10-11 12:58 ` [PATCH 1/4] PCI: designware: Fix compiler warning Kishon Vijay Abraham I
2016-10-11 13:50 ` Bjorn Helgaas
2016-10-11 12:58 ` [PATCH 2/4] PCI: dra7xx: simplify the probe code Kishon Vijay Abraham I
2016-10-11 12:58 ` [PATCH 3/4] PCI: dra7xx: Add support to force RC to work in GEN1 mode Kishon Vijay Abraham I
2016-10-11 16:19 ` Sekhar Nori
2016-10-12 4:14 ` Shawn Lin
2016-11-11 21:15 ` Bjorn Helgaas
2016-11-12 7:10 ` Kishon Vijay Abraham I
2016-11-14 21:24 ` Bjorn Helgaas
2016-11-16 16:44 ` Kishon Vijay Abraham I [this message]
2016-10-11 12:58 ` [PATCH 4/4] PCI: dra7xx: Enable MSI and legacy interrupts simultaneously Kishon Vijay Abraham I
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