Re: [PATCH 0/8] Subject: arm64: dts: qcom: Add t-power-on-us property for PCIe root ports

[Manivannan Sadhasivam]

On Fri, Sep 11, 2026 at 12:18:51PM +0530, Krishna Chaitanya Chundru wrote:
> The Qualcomm PCIe host controller driver added support for parsing the
> -power-on-us property[1] from each Root Port node and programming it as
> art of host initialization (PCI: qcom: Program T_POWER_ON) [2]. Prior to
> this, T_POWER_ON was expected to be programmed correctly in hardware or
> by the bootloader, but not all targets support this, which can lead to an
> incorrectly calculated LTR_L1.2_THRESHOLD in aspm.c and improper L1.2 exit
> behavior.
> 
> This series adds the t-power-on-us = <80>; property to the PCIe root
> port node(s) on the following targets, so the controller programs the
> correct T_POWER_ON value instead of relying on the (currently incorrect)
> hardware default:
> 
> - kodiak
> - lemans
> - monaco
> - hamoa
> - glymur
> - talos
> - sm8750
> - kaanapali
> 
> [1] https://lore.kernel.org/all/20260205093346.667898-1-krishna.chundru@xxxxxxxxxxxxxxxx/
> [2] https://lore.kernel.org/all/20260428-t_power_on_fux-v5-0-f1ef926a91ff@xxxxxxxxxxxxxxxx/
> 
> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@xxxxxxxxxxxxxxxx>

Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxxxxxxxx>

- Mani

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