linux-kernel - Re: [PATCH v1 0/1] phy: freescale: imx8m-pcie: facing pcie link-up instability

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Date: Sun, 7 Apr 2024 22:22:12 +0000
From: Marcel Ziswiler <marcel.ziswiler@...adex.com>
To: "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
	"vkoul@...nel.org" <vkoul@...nel.org>
CC: "hongxing.zhu@....com" <hongxing.zhu@....com>, "linux-imx@....com"
	<linux-imx@....com>, "robh@...nel.org" <robh@...nel.org>, "kishon@...nel.org"
	<kishon@...nel.org>, "heiko@...ech.de" <heiko@...ech.de>,
	"l.stach@...gutronix.de" <l.stach@...gutronix.de>,
	"yang.lee@...ux.alibaba.com" <yang.lee@...ux.alibaba.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tharvey@...eworks.com" <tharvey@...eworks.com>, "shawnguo@...nel.org"
	<shawnguo@...nel.org>, "kernel@...gutronix.de" <kernel@...gutronix.de>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>, "mkl@...gutronix.de"
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	<imx@...ts.linux.dev>, "festevam@...il.com" <festevam@...il.com>
Subject: Re: [PATCH v1 0/1] phy: freescale: imx8m-pcie: facing pcie link-up
 instability

Hi Vinod

On Sat, 2024-04-06 at 14:48 +0530, Vinod Koul wrote:
> 
> On Fri, 22 Mar 2024 14:06:31 +0100, Marcel Ziswiler wrote:
> > In our automated testing setup, we use Delock Mini-PCIe SATA cards [1].
> > While this setup has proven very stable overall we noticed upstream on
> > the i.MX8M Mini fails quite regularly (about 50/50) to bring up the PCIe
> > link while with NXP's downstream BSP 5.15.71_2.2.2 it always works. As
> > that old downstream stuff was quite different, I first also tried NXP's
> > latest downstream BSP 6.1.55_2.2.0 which from a PCIe point of view is
> > fairly vanilla, however, also there the PCIe link-up was not stable.
> > Comparing and debugging I noticed that upstream explicitly configures
> > the AUX_PLL_REFCLK_SEL to I_PLL_REFCLK_FROM_SYSPLL while working
> > downstream [2] leaving it at reset defaults of AUX_IN (PLL clock).
> > Unfortunately, the TRM does not mention any further details about this
> > register (both for the i.MX 8M Mini as well as the Plus). Maybe somebody
> > from NXP could further comment on this?
> > 
> > [...]
> 
> Applied, thanks!
> 
> [1/1] phy: freescale: imx8m-pcie: fix pcie link-up instability
>       commit: 3a161017f1de55cc48be81f6156004c151f32677

Sorry, but it is slightly confusing whether v1 or v2 now got applied. I believe v1 but then only the commit
messages differ. However, please note that only v2 included information on how to proceed concerning
backporting to stable 6.1.x.

Thanks!

> Best regards,
> --
> -Vinod

Cheers

Marcel