linux-kernel - RE: [PATCH v4 0/6] Add iMX8MP PCIe support

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Date:   Tue, 30 Aug 2022 02:58:44 +0000
From:   Hongxing Zhu <hongxing.zhu@....com>
To:     Lucas Stach <l.stach@...gutronix.de>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "robh@...nel.org" <robh@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "alexander.stein@...tq-group.com" <alexander.stein@...tq-group.com>,
        "marex@...x.de" <marex@...x.de>,
        "richard.leitner@...ux.dev" <richard.leitner@...ux.dev>
CC:     "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH v4 0/6] Add iMX8MP PCIe support

> -----Original Message-----
> From: Lucas Stach <l.stach@...gutronix.de>
> Sent: 2022年8月29日 23:20
> To: Hongxing Zhu <hongxing.zhu@....com>; p.zabel@...gutronix.de;
> bhelgaas@...gle.com; lorenzo.pieralisi@....com; robh@...nel.org;
> shawnguo@...nel.org; vkoul@...nel.org; alexander.stein@...tq-group.com;
> marex@...x.de; richard.leitner@...ux.dev
> Cc: linux-phy@...ts.infradead.org; devicetree@...r.kernel.org;
> linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; kernel@...gutronix.de; dl-linux-imx
> <linux-imx@....com>
> Subject: Re: [PATCH v4 0/6] Add iMX8MP PCIe support
> 
> Hi Richard,
> 
> instead of review comments I sent you a two patches to rework things more to
> my liking. Hope you agree with the approach.
> 
> One question, though: did you test this with devices with Gen2/3 speeds? The
> Marvell WiFi module on my EVK board only links with Gen1, while it claims
> Gen2 speed in the LnkCap register. However, it does seem to come up with
> Gen1 as the target link speed in LnkCtl2, so maybe the device is at fault here.
Hi Lucas:
Thanks for your help on this series.
I'm agree with your approach, and let blk-ctrl driver do the hsiomix resets.
Can I include the #1 patch into this series, and rebase the 2# fixup! patch
 into the phy changes patch with your sign-off?

Yes, I did the Gen3 NVEM device tests on i.MX8MP EVK board.
The Gen3 works fine.
Logs:
"
[    1.808033] phy phy-32f00000.pcie-phy.1: phy_power_on was called before phy_init
[    1.822609] imx6q-pcie 33800000.pcie: iATU unroll: enabled
[    1.836620] imx6q-pcie 33800000.pcie: iATU regions: 4 ob, 4 ib, align 64K, limit 16G
[    1.950427] imx6q-pcie 33800000.pcie: PCIe Gen.1 x1 link up
[    2.058138] imx6q-pcie 33800000.pcie: PCIe Gen.3 x1 link up
[    2.063731] imx6q-pcie 33800000.pcie: Link up, Gen3
[    2.068619] imx6q-pcie 33800000.pcie: PCIe Gen.3 x1 link up
"

Best Regards
Richard Zhu
> 
> Regards,
> Lucas
> 
> Am Montag, dem 29.08.2022 um 16:15 +0800 schrieb Richard Zhu:
> > Based on the 6.0-rc1 of the pci/next branch.
> > This series adds the i.MX8MP PCIe support and tested on i.MX8MP EVK
> > board when one PCIe NVME device is used.
> >
> > - i.MX8MP PCIe has reversed initial PERST bit value refer to
> i.MX8MQ/i.MX8MM.
> >   Add the PHY PERST explicitly for i.MX8MP PCIe PHY.
> > - Add the i.MX8MP PCIe PHY support in the i.MX8M PCIe PHY driver.
> >   And share as much as possible codes with i.MX8MM PCIe PHY.
> > - Add the i.MX8MP PCIe support in binding document, DTS files, and PCIe
> >   driver.
> >
> > Main changes v3-->v4:
> > - Regarding Phillip's suggestions, add fix tag into the first commit.
> > - Add Reviewed and Tested tags.
> >
> > Main changes v2-->v3:
> > - Fix the schema checking error in the PHY dt-binding patch.
> > - Inspired by Lucas, the PLL configurations might not required when
> >   external OSC is used as PCIe referrence clock. It's true. Remove all
> >   the HSIO PLL bit manipulations, and PCIe works fine on i.MX8MP EVK
> board
> >   with one NVME device is used.
> > - Drop the #4 patch of v2, since it had been applied by Rob.
> >
> > Main changes v1-->v2:
> > - It's my fault forget including Vinod, re-send v2 after include Vinod
> >   and linux-phy@...ts.infradead.org.
> > - List the basements of this patch-set. The branch, codes changes and so on.
> > - Clean up some useless register and bit definitions in #3 patch.
> >
> > Documentation/devicetree/bindings/phy/fsl,imx8-pcie-phy.yaml |  16
> +++++++--
> > arch/arm64/boot/dts/freescale/imx8mp-evk.dts                 |  53
> +++++++++++++++++++++++++++++
> > arch/arm64/boot/dts/freescale/imx8mp.dtsi                    |  46
> ++++++++++++++++++++++++-
> > drivers/pci/controller/dwc/pci-imx6.c                        |  17
> +++++++++-
> > drivers/phy/freescale/phy-fsl-imx8m-pcie.c                   | 150
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------
> ------------------
> > drivers/reset/reset-imx7.c                                   |   1 +
> > 6 files changed, 232 insertions(+), 51 deletions(-)
> >
> > [PATCH v4 1/6] reset: imx7: Fix the iMX8MP PCIe PHY PERST support
> > [PATCH v4 2/6] dt-binding: phy: Add iMX8MP PCIe PHY binding [PATCH v4
> > 3/6] phy: freescale: imx8m-pcie: Add iMX8MP PCIe PHY [PATCH v4 4/6]
> > arm64: dts: imx8mp: Add iMX8MP PCIe support [PATCH v4 5/6] arm64: dts:
> > imx8mp-evk: Add PCIe support [PATCH v4 6/6] PCI: imx6: Add iMX8MP PCIe
> > support
>