linux-kernel - Re: [PATCH 3/5] PCI: mediatek-gen3: Disable ASPM L0s

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Message-ID: <20250103191552.GA4190763@bhelgaas>
Date: Fri, 3 Jan 2025 13:15:52 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Jianjun Wang <jianjun.wang@...iatek.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Ryder Lee <ryder.lee@...iatek.com>, linux-pci@...r.kernel.org,
	linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Xavier Chang <Xavier.Chang@...iatek.com>
Subject: Re: [PATCH 3/5] PCI: mediatek-gen3: Disable ASPM L0s

On Fri, Jan 03, 2025 at 02:00:13PM +0800, Jianjun Wang wrote:
> Disable ASPM L0s support because it does not significantly save power
> but impacts performance.

This seems like a user/administrator decision, not a driver decision.

L0s reduces power at the cost of performance for *all* PCIe devices,
although the actual numbers may vary.