linux-kernel - Re: [PATCH v2] PCI: cadence: Fix Gen2 Link Retraining process

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Date:   Wed, 29 Mar 2023 20:11:25 +0530
From:   "Raghavendra, Vignesh" <vigneshr@...com>
To:     Siddharth Vadapalli <s-vadapalli@...com>, <tjoseph@...ence.com>,
        <lpieralisi@...nel.org>, <robh@...nel.org>, <kw@...ux.com>,
        <bhelgaas@...gle.com>, <nadeem@...ence.com>
CC:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>, <nm@...com>
Subject: Re: [PATCH v2] PCI: cadence: Fix Gen2 Link Retraining process

Hi Lorenzo, Bjorn,

On 3/15/2023 12:38 PM, Siddharth Vadapalli wrote:
> The Link Retraining process is initiated to account for the Gen2 defect in
> the Cadence PCIe controller in J721E SoC. The errata corresponding to this
> is i2085, documented at:
> https://www.ti.com/lit/er/sprz455c/sprz455c.pdf
> 
> The existing workaround implemented for the errata waits for the Data Link
> initialization to complete and assumes that the link retraining process
> at the Physical Layer has completed. However, it is possible that the
> Physical Layer training might be ongoing as indicated by the
> PCI_EXP_LNKSTA_LT bit in the PCI_EXP_LNKSTA register.
> 
> Fix the existing workaround, to ensure that the Physical Layer training
> has also completed, in addition to the Data Link initialization.
> 
> Fixes: 4740b969aaf5 ("PCI: cadence: Retrain Link to work around Gen2 training defect")
> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
> Reviewed-by: Vignesh Raghavendra <vigneshr@...com>
> ---
> Changes from v1:
> 1. Collect Reviewed-by tag from Vignesh Raghavendra.
> 2. Rebase on next-20230315.
> 
> v1:
> https://lore.kernel.org/r/20230102075656.260333-1-s-vadapalli@ti.com
> 
>  .../controller/cadence/pcie-cadence-host.c    | 27 +++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 

Wondering do one of you be pulling this patch in? This patch was never
picked for 6.3-rc1 merge cycle... Just want to make sure
pcie-cadence*.c and pci-j721e.c patches have a path to reach pci tree.



[...]

Regards
Vignesh