Re: [PATCH v7 00/14] PCI: rzg3s-host: Add PCIe hotplug support

[Wolfram Sang <wsa+renesas@sang-engineering.com>]

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On Mon, Oct 19, 2026 at 09:50:11AM +0300, Claudiu Beznea wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
> 
> Hi,
> 
> Series adds hotplug support for the rzg3s-host driver. This is a
> continuation of the series John posted initially at [1]. Along with it,
> prerequisites fixes and cleanup patches were added.
> 
> Series was tested on RZ/G3S and RZ/G3E boards by generating consecutive
> link down/up events. The RZ/G3S has an I2C device which, depending on
> the way it is programmed, it controls the state of the PCIe link. The
> board has 3 PCIe interface: PCIE_SLOT, M.2 Key E, M.2 Key B. The
> following script was executed for ~9 hours:
> 
> #!/bin/sh
> 
> echo performance > /sys/module/pcie_aspm/parameters/policy
> 
> while :; do
>         i2cset -y 1 0x18 0xf4 0x8 # Link down
>         i2cset -y 1 0x18 0xf4 0xc # Link up: PCIE_SLOT (NVMe Micron)
>         i2cset -y 1 0x18 0xf4 0x8 # Link down
>         i2cset -y 1 0x18 0xf4 0xd # Link up: M.2 Key B (NVMe Transcend)
>         i2cset -y 1 0x18 0xf4 0x8 # Link down
>         i2cset -y 1 0x18 0xf4 0xb # Link up: M.2 Key E (WiFi AX200)
> done

Tested with my G3S board and physical plug/unplug as well as the script
above:

Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>


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