linux-kernel - Re: [PATCH v5 0/2] Configure root port MPS during host probing

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Message-ID: <aLarzJZI3E_sb7_Y@flawful.org>
Date: Tue, 2 Sep 2025 10:33:16 +0200
From: Niklas Cassel <cassel@...nel.org>
To: Hans Zhang <18255117159@....com>
Cc: lpieralisi@...nel.org, kwilczynski@...nel.org, bhelgaas@...gle.com,
	heiko@...ech.de, mani@...nel.org, yue.wang@...ogic.com,
	pali@...nel.org, neil.armstrong@...aro.org, robh@...nel.org,
	jingoohan1@...il.com, khilman@...libre.com, jbrunet@...libre.com,
	martin.blumenstingl@...glemail.com, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-amlogic@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v5 0/2] Configure root port MPS during host probing

On Fri, Jun 20, 2025 at 11:55:05PM +0800, Hans Zhang wrote:
> Current PCIe initialization exhibits a key optimization gap: Root Ports
> may operate with non-optimal Maximum Payload Size (MPS) settings. While
> downstream device configuration is handled during bus enumeration, Root
> Port MPS values inherited from firmware or hardware defaults often fail
> to utilize the full capabilities supported by controller hardware. This
> results in suboptimal data transfer efficiency throughout the PCIe
> hierarchy.

(snip)

Gentle ping.