linux-kernel - RE: [PATCH v6 02/11] arm64: defconfig: enable CONFIG_PCIE_RCAR

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Date:   Fri, 3 Apr 2020 09:44:58 +0000
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Will Deacon <will@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Catalin Marinas <catalin.marinas@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Murray <andrew.murray@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Frank Rowand <frowand.list@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Simon Horman <horms@...ge.net.au>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Tom Joseph <tjoseph@...ence.com>,
        Heiko Stuebner <heiko@...ech.de>,
        "linux-rockchip@...ts.infradead.org" 
        <linux-rockchip@...ts.infradead.org>,
        Lad Prabhakar <prabhakar.csengg@...il.com>,
        Magnus Damm <magnus.damm@...il.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: RE: [PATCH v6 02/11] arm64: defconfig: enable CONFIG_PCIE_RCAR_HOST

Hi Prabhakar-san,

> From: Prabhakar Mahadev Lad, Sent: Friday, April 3, 2020 6:32 PM
<snip>
> > > BTW, I'm wondering about "[PATCH v6 05/11] PCI: rcar: Fix calculating
> > > mask for PCIEPAMR register". Can the issue fixed by this patch happen with
> > > the current driver in host mode, or is that limited to ep mode?
> > > In case of the former, please submit it to the PCI maintainer as a separate
> > > fix.
> >
> > Thank you for pointed it out. I think this is the case of the former.
> > IIUC, if such a small window PCIe device exists, the issue happens.
> >
> > Prabhakar-san, is my understanding correct?
> >
> This issue will only be hit on EP, when in host mode the sizes will be fixed to 1 Mbytes /2 Mbytes /128 Mbytes

Thank you for your comment. Now I understood this is related to "PCIEn memory m" in the document
and related to ranges property in the device node. So, I'd like to recall my previous comment and
I agree the patch 06/11 is required on EP mode only.

Best regards,
Yoshihiro Shimoda