linux-kernel - Re: [PATCH 2/2] phy: qcom: qmp-pcie: Add X1E80100 Gen4 4-lane mode support

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Date: Tue, 4 Jun 2024 15:25:52 +0300
From: Abel Vesa <abel.vesa@...aro.org>
To: Johan Hovold <johan@...nel.org>
Cc: Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
	linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] phy: qcom: qmp-pcie: Add X1E80100 Gen4 4-lane mode
 support

On 24-06-03 14:46:12, Johan Hovold wrote:
> On Fri, May 31, 2024 at 07:06:45PM +0300, Abel Vesa wrote:
> > The PCIe 6th instance from X1E80100 can be used in both 4-lane mode or
> > 2-lane mode. Add the configuration and compatible for the 4-lane mode.
> 
> Same language nits as for patch 1/1.
> 
> > Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> 
> I tried this patch along with the DT changes and the link on the CRD
> still comes up as 2-lane:
> 
> 	qcom-pcie 1bf8000.pci: PCIe Gen.4 x2 link up
> 
> so something appears to be wrong here. (I noticed the same with your
> next branch last week.)
> 
> How did you test this? Does the link actually come up as 4-lane for you?

This is the PHY part. The controller needs some changes as well.

Yes, as of yet, I'm not able to bring the link up in 4-lanes mode.
This however doesn't mean the PHY sequence is incorrect.

But, I agree, maybe I should hold on to the PHY changes as well until
we get the controller side working as well.

Thanks for reviewing.

> 
> Johan