linux-kernel - Re: [RESEND RFC PATCH v4 3/5] PCI: rockchip: Set Target Link Speed before retraining

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Message-ID: <20250613201543.GA974034@bhelgaas>
Date: Fri, 13 Jun 2025 15:15:43 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Geraldo Nascimento <geraldogabriel@...il.com>
Cc: linux-rockchip@...ts.infradead.org,
	Shawn Lin <shawn.lin@...k-chips.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Heiko Stuebner <heiko@...ech.de>, Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	linux-phy@...ts.infradead.org, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND RFC PATCH v4 3/5] PCI: rockchip: Set Target Link Speed
 before retraining

On Fri, Jun 13, 2025 at 12:06:00PM -0300, Geraldo Nascimento wrote:
> Current code may fail Gen2 retraining if Target Link Speed
> is set to 2.5 GT/s in Link Control and Status Register 2.
> Set it to 5.0 GT/s accordingly.

Nit: I don't know what "Gen2" means (and the spec warns against
assuming spec rev maps one-to-one to a speed), so try to use the
actual speed instead of "GenX".

Bjorn