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>
Subject: Re: [PATCH 3/4] PCI: dra7xx: Add support to force RC to work in GEN1 mode
Date: Sat, 12 Nov 2016 12:40:10 +0530 [thread overview]
Message-ID: <8ecc1325-365d-bdec-d435-729e0ea49d20@ti.com> (raw)
In-Reply-To: <20161111211528.GF9868@bhelgaas-glaptop.roam.corp.google.com>
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?
Thanks
Kishon
next prev parent reply other threads:[~2016-11-13 20:17 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 [this message]
2016-11-14 21:24 ` Bjorn Helgaas
2016-11-16 16:44 ` Kishon Vijay Abraham I
2016-10-11 12:58 ` [PATCH 4/4] PCI: dra7xx: Enable MSI and legacy interrupts simultaneously Kishon Vijay Abraham I
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