linux-kernel - Re: [PATCH v4 00/11] PCI: rockchip: Fix RK3399 PCIe endpoint controller driver

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Message-ID: <CAAEEuhpj4TZNrPEPn7LuGOHHoYt1FbCEGH1d9g+8iKMeoBA+=Q@mail.gmail.com>
Date:   Tue, 18 Apr 2023 09:51:21 +0200
From:   Rick Wertenbroek <rick.wertenbroek@...il.com>
To:     Damien Le Moal <dlemoal@...nel.org>
Cc:     alberto.dassatti@...g-vd.ch, xxm@...k-chips.com,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Brian Norris <briannorris@...omium.org>,
        Johan Jonker <jbx6244@...il.com>,
        Caleb Connolly <kc@...tmarketos.org>,
        Corentin Labbe <clabbe@...libre.com>,
        Judy Hsiao <judyhsiao@...omium.org>,
        Arnaud Ferraris <arnaud.ferraris@...labora.com>,
        Hugh Cole-Baker <sigmaris@...il.com>,
        linux-pci@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 00/11] PCI: rockchip: Fix RK3399 PCIe endpoint
 controller driver

On Tue, Apr 18, 2023 at 2:09 AM Damien Le Moal <dlemoal@...nel.org> wrote:
>
> On 4/17/23 18:26, Rick Wertenbroek wrote:
> > This is a series of patches that fixes the PCIe endpoint controller driver
> > for the Rockchip RK3399 SoC. The driver was introduced in commit
> > cf590b078391 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller")
> > The original driver had issues and would not allow for the RK3399 to
> > operate in PCIe endpoint mode correctly. This patch series fixes that so
> > that the PCIe core controller of the RK3399 SoC can now act as a PCIe
> > endpoint. This is v4 of the patch series and addresses the comments received
> > during the review of the v3 [1]. The changes to the v3 are minor and none of
> > them change the logic of the driver.
> >
> > Thank you in advance for reviewing this patch series and hopefully
> > getting this merged. Having a functional PCIe endpoint controller
> > driver for the RK3399 would allow to develop further PCIe endpoint
> > functions through the Linux PCIe endpoint framework using this SoC.
> >
> > [1] https://lore.kernel.org/linux-pci/20230404082426.3880812-1-rick.wertenbroek@gmail.com/
> >
> > Summary of changes to V3 :
> >
> > * Set the fields in the standard order in the dtsi and removed unnecessary
> >   change in associated documentation, thanks to Krzysztof for pointing this out.
> > * Added comment to explain how MSI-X capabilities advertisement was removed.
> > * Changed Damien Le Moal <damien.lemoal@...nsource.wdc.com> address to his
> >   kernel.org address Damien Le Moal <dlemoal@...nel.org> in tags.
> > * [minor] Simplified code where a power of 2 was applied followed by a ilog2
> >   operation.
> > * [minor] Small code changes, replaced constant variable by macro, split
> >   remaining long lines.
>
> I retested this series, all good. So my Tested-by tag stands.
>
> Lorenzo, Krzysztof, Bjorn,
>
> Let's please get this series queued for 6.4 ASAP as otherwise the rockchip EP
> controller is unusable.
>
> Also please note that working with Rick off-list, we found out that more fixes
> are in fact needed for the PCI address mapping (ATU programming) on top of this
> series. But the problems detected are subtle and harder to trigger. The fixes
> needed involve changes to the EPC core API so we are still working on the best
> way to do that. We'll work on another series on top of this one for addressing
> these issues.
>
>

Thank you Damien for taking the time testing and reviewing this, it is
highly appreciated.
I just sent a v5 [1] addressing your comments and added the tags.

Best regards,
Rick

[1] https://lore.kernel.org/linux-pci/20230418074700.1083505-1-rick.wertenbroek@gmail.com/