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

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Date:   Fri, 17 Jan 2020 12:42:47 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Vidya Sagar <vidyas@...dia.com>
Cc:     bhelgaas@...gle.com, lorenzo.pieralisi@....com, rjw@...ysocki.net,
        lenb@...nel.org, andrew.murray@....com, treding@...dia.com,
        jonathanh@...dia.com, 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 2/2] PCI: Add MCFG quirks for Tegra194 host controllers

On Sat, Jan 11, 2020 at 12:45:00AM +0530, 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.
> 
> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
> Reported-by: kbuild test robot <lkp@...el.com>
> ---
> V3:
> * Removed MCFG address hardcoding in pci_mcfg.c file
> * Started using 'dbi_base' for accessing root port's own config space
> * and using 'config_base' for accessing config space of downstream hierarchy
> 
> V2:
> * Fixed build issues reported by kbuild test bot
> 
>  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 +
>  5 files changed, 113 insertions(+), 2 deletions(-)

Acked-by: Thierry Reding <treding@...dia.com>

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