Re: [PATCH] arm64: defconfig: Enable Qualcomm UFS and QMP UFS PHY drivers as built-in

[Krzysztof Kozlowski <krzk@kernel.org>]

On 17/04/2026 05:55, Shawn Guo wrote:
> UFS is the primary storage for Linux rootfs across the breadth of
> Qualcomm development boards - Mobile, Automotive and IoT.  With
> Qualcomm UFS host controller driver (SCSI_UFS_QCOM) and the UFS PHY
> driver (PHY_QCOM_QMP_UFS) as modules, developers need an initramfs

Yes, you always need initramfs and every developer has it.

> to boot from UFS, which adds friction to daily development workflows.

No friction, it's both standard, easy and all of Qualcomm and Linaro
developers have it solved long time ago.

> Promote both to built-in to allow booting directly from UFS without
> an initramfs.
> 
> PHY_QCOM_QMP is a menuconfig umbrella for all Qualcomm QMP PHY drivers.
> Setting it to built-in is required to allow any of its sub-drivers to be
> built-in.  Since only the UFS PHY (PHY_QCOM_QMP_UFS) needs to be
> built-in for the rootfs use case, the PCIe and USB sub-drivers
> (PHY_QCOM_QMP_PCIE, PHY_QCOM_QMP_PCIE_8996, PHY_QCOM_QMP_USB) are
> explicitly set to module to avoid unnecessarily inflating the kernel
> image.  The combo PHY sub-driver (PHY_QCOM_QMP_COMBO) is naturally
> capped at module by its dependencies on TYPEC=m and DRM=m.
> 
> Signed-off-by: Shawn Guo <shengchao.guo@oss.qualcomm.com>
> ---
>  arch/arm64/configs/defconfig | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
> index dd1ac01ee29b..f6ac2d29cbdf 100644
> --- a/arch/arm64/configs/defconfig
> +++ b/arch/arm64/configs/defconfig
> @@ -1316,7 +1316,7 @@ CONFIG_SCSI_UFSHCD=y
>  CONFIG_SCSI_UFS_BSG=y
>  CONFIG_SCSI_UFSHCD_PLATFORM=y
>  CONFIG_SCSI_UFS_CDNS_PLATFORM=m
> -CONFIG_SCSI_UFS_QCOM=m
> +CONFIG_SCSI_UFS_QCOM=y

No, I reiterated this many times on the list, so once more: no.

This is fine as module.

Best regards,
Krzysztof