linux-kernel - Re: [PATCH] arm64: defconfig: build-in Qualcomm SC7180 and SM8450 interconnects

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Date:   Fri, 21 Oct 2022 11:18:29 +0200
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: defconfig: build-in Qualcomm SC7180 and SM8450
 interconnects



On 21.10.2022 05:27, Krzysztof Kozlowski wrote:
> On Qualcomm SC7180 and SM8450 SocS, the typical debug console serial
> port is part of GENI Serial Engine QUP Wrapper Controller which uses
> interconnects.  This means that without interconnect drivers, the serial
> might not probe.  Without serial console, the root might not be mounted
> by initramfs:
> 
>   + REASON=No init found. Try passing init= bootarg. PS1=(initramfs
>   ...
>   (initramfs) run-init -c /dev/console -n /root /sbin/init
>   run-init: opening console: No such file or directory
> 
> This means that interconnect drivers on these Qualcomm SoCs cannot be
> modules and must be built-in to mount rootfs.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@...ainline.org>

Konrad
>  arch/arm64/configs/defconfig | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
> index 2af94d3c1c11..c1b7fb44e381 100644
> --- a/arch/arm64/configs/defconfig
> +++ b/arch/arm64/configs/defconfig
> @@ -1301,7 +1301,7 @@ CONFIG_INTERCONNECT_QCOM_MSM8916=m
>  CONFIG_INTERCONNECT_QCOM_MSM8996=m
>  CONFIG_INTERCONNECT_QCOM_OSM_L3=m
>  CONFIG_INTERCONNECT_QCOM_QCS404=m
> -CONFIG_INTERCONNECT_QCOM_SC7180=m
> +CONFIG_INTERCONNECT_QCOM_SC7180=y
>  CONFIG_INTERCONNECT_QCOM_SC7280=y
>  CONFIG_INTERCONNECT_QCOM_SC8180X=y
>  CONFIG_INTERCONNECT_QCOM_SC8280XP=y
> @@ -1309,7 +1309,7 @@ CONFIG_INTERCONNECT_QCOM_SDM845=y
>  CONFIG_INTERCONNECT_QCOM_SM8150=m
>  CONFIG_INTERCONNECT_QCOM_SM8250=m
>  CONFIG_INTERCONNECT_QCOM_SM8350=m
> -CONFIG_INTERCONNECT_QCOM_SM8450=m
> +CONFIG_INTERCONNECT_QCOM_SM8450=y
>  CONFIG_EXT2_FS=y
>  CONFIG_EXT3_FS=y
>  CONFIG_EXT4_FS_POSIX_ACL=y