linux-kernel - Re: [PATCH] ARM: dts: imx6qdl: only enable pcie in the pcie dts file

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Date:   Mon, 13 Jul 2020 14:48:52 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Richard Zhu <hongxing.zhu@....com>
Cc:     linux-imx@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: imx6qdl: only enable pcie in the pcie dts file

On Mon, Jul 06, 2020 at 04:44:41PM +0800, Richard Zhu wrote:
> Since iMX6Q/DL PCIe has the PM limitation (ERR005723 "PCIe PCIe does
> not support L2 Power Down").
> System suspend/resume would be broken by PCIe, if PCIe is enabled.
> Only enable PCIe in the xxx-pcie.dts files to avoid the brokens when
> other xxx.dtb files are used on sabresd and sabreauto boards.
> 
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> ---
>  arch/arm/boot/dts/Makefile                  |  4 ++++
>  arch/arm/boot/dts/imx6dl-sabreauto-pcie.dts | 12 ++++++++++++
>  arch/arm/boot/dts/imx6dl-sabresd-pcie.dts   | 12 ++++++++++++
>  arch/arm/boot/dts/imx6q-sabreauto-pcie.dts  | 12 ++++++++++++
>  arch/arm/boot/dts/imx6q-sabresd-pcie.dts    | 12 ++++++++++++
>  arch/arm/boot/dts/imx6qdl-sabreauto.dtsi    |  4 ----
>  arch/arm/boot/dts/imx6qdl-sabresd.dtsi      |  1 -
>  7 files changed, 52 insertions(+), 5 deletions(-)
>  create mode 100644 arch/arm/boot/dts/imx6dl-sabreauto-pcie.dts
>  create mode 100644 arch/arm/boot/dts/imx6dl-sabresd-pcie.dts
>  create mode 100644 arch/arm/boot/dts/imx6q-sabreauto-pcie.dts
>  create mode 100644 arch/arm/boot/dts/imx6q-sabresd-pcie.dts

No.  There are hundreds of boards based on i.MX6Q/DL.  We are not going
to maintain a -pcie.dts for every single one of them.

Shawn