linux-kernel - RE: [EXT] [RFC PATCH 0/5] PCIe EPF support for internal DMAC handling and driver update for R-Car PCIe EP to support DMAC

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Date:   Thu, 10 Feb 2022 05:54:26 +0000
From:   Li Chen <lchen@...arella.com>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
CC:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Rob Herring <robh@...nel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: RE: [EXT] [RFC PATCH 0/5] PCIe EPF support for internal DMAC handling
 and driver update for R-Car PCIe EP to support DMAC

Hi Prabhakar,

> -----Original Message-----
> From: Lad, Prabhakar [mailto:prabhakar.csengg@...il.com]
> Sent: Wednesday, February 9, 2022 4:53 PM
> To: Li Chen
> Cc: Lad Prabhakar; Kishon Vijay Abraham I; Bjorn Helgaas; Lorenzo Pieralisi;
> Krzysztof Wilczyński; Arnd Bergmann; Greg Kroah-Hartman; Marek Vasut;
> Yoshihiro Shimoda; Rob Herring; linux-pci@...r.kernel.org; linux-renesas-
> soc@...r.kernel.org; linux-kernel@...r.kernel.org; Biju Das
> Subject: Re: [EXT] [RFC PATCH 0/5] PCIe EPF support for internal DMAC handling
> and driver update for R-Car PCIe EP to support DMAC
> 
> Hi Chen-san,
> 
> On Wed, Feb 9, 2022 at 4:48 AM Li Chen <lchen@...arella.com> wrote:
> >
> > Hi Prabhakar,
> >
> > > [0] https://urldefense.com/v3/__https://www.spinics.net/lists/linux-
> > >
> pci/msg92385.html__;!!PeEy7nZLVv0!yP0WqYs165riCjWRhZprjgMVVLfQLtkkPfv_
> > > R7XCoqkqgMsOyor90EZp0YAdxu0$
> >
> > Can your streaming DMA test case(-d) pass if you use EP's internal DMAC
> instead of external DMAC?
> >
> Sorry I don't quite get you here.
> 
> This patch series adds support for EP to transfer using internal DMAC
> as no external DMAC is supported, so when "-d" option is passed and if
> EP has registered it has internal dmac it will use the same and run
> the pcitest.

Ok, in my case, read/write via external DMAC always get incorrect data, but read via internal DMAC is correct. Maybe this is our RTL's issue.

Regards,
Li

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