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From: Vidya Sagar <vidyas@nvidia.com>
To: <bhelgaas@google.com>, <lorenzo.pieralisi@arm.com>,
	<rjw@rjwysocki.net>, <lenb@kernel.org>, <andrew.murray@arm.com>,
	<treding@nvidia.com>, <jonathanh@nvidia.com>
Cc: <linux-tegra@vger.kernel.org>, <linux-pci@vger.kernel.org>,
	<linux-acpi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<kthota@nvidia.com>, <mmaddireddy@nvidia.com>,
	<sagar.tv@gmail.com>
Subject: Re: [PATCH V3 0/2] PCI: Add MCFG quirks for Tegra194 host controllers
Date: Thu, 16 Jan 2020 22:48:08 +0530
Message-ID: <e264ae37-f3b3-96d1-9294-3ea9f78b78fc@nvidia.com> (raw)
In-Reply-To: <20200110191500.9538-1-vidyas@nvidia.com>

Hi Bjorn,
Could you please review this series?

Thanks in advance,
Vidya Sagar

On 1/11/20 12:44 AM, Vidya Sagar wrote:
> The PCIe controller in Tegra194 SoC is not completely ECAM-compliant.
> With the current hardware design limitations in place, ECAM can be enabled
> only for one controller (C5 controller to be precise) with bus numbers
> starting from 160 instead of 0. A different approach is taken to avoid this
> abnormal way of enabling ECAM for just one controller but to enable
> configuration space access for all the other controllers. In this approach,
> ops are added through MCFG quirk mechanism which access the configuration
> spaces by dynamically programming iATU (internal AddressTranslation Unit)
> to generate respective configuration accesses just like the way it is
> done in DesignWare core sub-system.
> To increase the size of ECAM, a device-tree change is pushed in this series
> to move the IO window from 32-bit PCIe aperture to 64-bit PCIe aperture leaving
> the entire 32MB of 32-bit aperture for configuration space access.
> 
> V3:
> * Pushed a device-tree change in the series to enable more space for ECAM
> 
> Vidya Sagar (2):
>    arm64: tegra: Re-order PCIe aperture mappings to support ACPI boot
>    PCI: Add MCFG quirks for Tegra194 host controllers
> 
>   arch/arm64/boot/dts/nvidia/tegra194.dtsi   |  36 ++++----
>   drivers/acpi/pci_mcfg.c                    |   7 ++
>   drivers/pci/controller/dwc/Kconfig         |   3 +-
>   drivers/pci/controller/dwc/Makefile        |   2 +-
>   drivers/pci/controller/dwc/pcie-tegra194.c | 102 +++++++++++++++++++++
>   include/linux/pci-ecam.h                   |   1 +
>   6 files changed, 131 insertions(+), 20 deletions(-)
> 

      parent reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-03 17:49 [PATCH] " Vidya Sagar
2020-01-03 18:04 ` Bjorn Helgaas
2020-01-04  3:44   ` Vidya Sagar
2020-01-17 12:17     ` Lorenzo Pieralisi
2020-01-20 11:10       ` Thierry Reding
2020-01-20 15:18         ` Lorenzo Pieralisi
2020-01-21 13:44           ` Thierry Reding
2020-01-23 10:49             ` Lorenzo Pieralisi
2020-01-04 21:53 ` kbuild test robot
2020-01-06  8:27 ` [PATCH V2] " Vidya Sagar
2020-01-10 19:14   ` [PATCH V3 0/2] " Vidya Sagar
2020-01-10 19:14     ` [PATCH V3 1/2] arm64: tegra: Re-order PCIe aperture mappings to support ACPI boot Vidya Sagar
2020-01-10 19:15     ` [PATCH V3 2/2] PCI: Add MCFG quirks for Tegra194 host controllers Vidya Sagar
2020-01-17 11:42       ` Thierry Reding
2020-01-16 17:18     ` Vidya Sagar [this message]

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