[PATCH v6 0/7] Introduce SpacemiT K1 PCIe phy and host controller

[Jason Montleon]

On Thu, Nov 13, 2025 at 4:45 PM Alex Elder <elder at riscstar.com> wrote:
>
> This series introduces a PHY driver and a PCIe driver to support PCIe
> on the SpacemiT K1 SoC.  The PCIe implementation is derived from a
> Synopsys DesignWare PCIe IP.  The PHY driver supports one combination
> PCIe/USB PHY as well as two PCIe-only PHYs.  The combo PHY port uses
> one PCIe lane, and the other two ports each have two lanes.  All PCIe
> ports operate at 5 GT/second.
>
> The PCIe PHYs must be configured using a value that can only be
> determined using the combo PHY, operating in PCIe mode.  To allow
> that PHY to be used for USB, the needed calibration step is performed
> by the PHY driver automatically at probe time.  Once this step is done,
> the PHY can be used for either PCIe or USB.
>
> The driver supports 256 MSIs, and initially does not support PCI INTx
> interrupts.  The hardware does not support MSI-X.
>
> Version 6 of this series addresses a few comments from Christophe
> Jaillet, and improves a workaround that disables ASPM L1.  The two
> people who had reported errors on earlier versions of this code have
> confirmed their NVMe devices now work when configured with the default
> RISC-V kernel configuration.

I successfully tested this patchset on a Banana Pi F3 and also a
Milk-V M1 Jupiter by making the same additions to k1-milkv-jupiter.dts
as were made to k1-bananapi-f3.dts.
I no longer have problems with NVME devices like I did when I tried v3 and v4.

Tested-by: Jason Montleon <jmontleo at redhat.com>