linux-kernel - Re: [PATCH V3 0/2] PCI: Add MCFG quirks for Tegra194 host controllers

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Message-ID: <e264ae37-f3b3-96d1-9294-3ea9f78b78fc@nvidia.com>
Date:   Thu, 16 Jan 2020 22:48:08 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <bhelgaas@...gle.com>, <lorenzo.pieralisi@....com>,
        <rjw@...ysocki.net>, <lenb@...nel.org>, <andrew.murray@....com>,
        <treding@...dia.com>, <jonathanh@...dia.com>
CC:     <linux-tegra@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kthota@...dia.com>, <mmaddireddy@...dia.com>, <sagar.tv@...il.com>
Subject: Re: [PATCH V3 0/2] PCI: Add MCFG quirks for Tegra194 host controllers

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(-)
>