linux-kernel - Re: [PATCH V4 6/6] PCI: tegra: Disable LTSSM during L2 entry

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Date:   Thu, 26 Nov 2020 12:34:59 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Vidya Sagar <vidyas@...dia.com>
Cc:     lorenzo.pieralisi@....com, robh+dt@...nel.org, bhelgaas@...gle.com,
        jonathanh@...dia.com, amanharitsh123@...il.com,
        dinghao.liu@....edu.cn, kw@...ux.com, linux-pci@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        kthota@...dia.com, mmaddireddy@...dia.com, sagar.tv@...il.com
Subject: Re: [PATCH V4 6/6] PCI: tegra: Disable LTSSM during L2 entry

On Mon, Nov 09, 2020 at 10:49:37PM +0530, Vidya Sagar wrote:
> PCIe cards like Marvell SATA controller and some of the Samsung NVMe
> drives don't support taking the link to L2 state. When the link doesn't
> go to L2 state, Tegra194 requires the LTSSM to be disabled to allow PHY
> to start the next link up process cleanly during suspend/resume sequence.
> Failing to disable LTSSM results in the PCIe link not coming up in the
> next resume cycle.
> 
> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
> ---
> V4:
> * New patch in this series
> 
>  drivers/pci/controller/dwc/pcie-tegra194.c | 16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)

Tested-by: Thierry Reding <treding@...dia.com>
Acked-by: Thierry Reding <treding@...dia.com>

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