linux-kernel - Re: [PATCH V4 0/6] Enhancements to Tegra194 PCIe driver

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Message-ID: <20201125175709.GA1274379@ulmo>
Date:   Wed, 25 Nov 2020 18:57:09 +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 0/6] Enhancements to Tegra194 PCIe driver

On Mon, Nov 09, 2020 at 10:49:31PM +0530, Vidya Sagar wrote:
> This series of patches do some enhancements and some bug fixes to the
> Tegra194 PCIe platform driver like
> - Fix Vendor-ID corruption
> - Map DBI space correctly
> - Update DWC IP version
> - Continue with uninitialization sequence even if parts fail
> - Check return value of tegra_pcie_init_controller()
> 
> V4:
> * Added a new patch to address link-up issues with some of the cards
> 
> V3:
> * Addressed Bjorn's review comments
> * Split earlier patch-4 into two
>   - Continue with the uninitialization sequence even if some parts fail
>   - Check return value of tegra_pcie_init_controller() and exit accordingly
> 
> V2:
> * Addressed Rob's comments. Changed 'Strongly Ordered' to 'nGnRnE'
> 
> Vidya Sagar (6):
>   PCI: tegra: Fix ASPM-L1SS advertisement disable code
>   PCI: tegra: Map configuration space as nGnRnE
>   PCI: tegra: Set DesignWare IP version
>   PCI: tegra: Continue unconfig sequence even if parts fail
>   PCI: tegra: Check return value of tegra_pcie_init_controller()
>   PCI: tegra: Disable LTSSM during L2 entry
> 
>  drivers/pci/controller/dwc/pcie-tegra194.c | 78 +++++++++++-----------
>  1 file changed, 39 insertions(+), 39 deletions(-)

I was going to test this series, but then I noticed that PCI is causing
a crash on linux-next (as of fairly recently). So I tried applying this
on top of v5.10-rc1, but that gives me the following:

	[    3.595161] ahci 0001:01:00.0: version 3.0
	[    3.595726] ahci 0001:01:00.0: SSS flag set, parallel bus scan disabled
	[    4.609923] ahci 0001:01:00.0: controller reset failed (0xffffffff)
	[    4.610343] ahci: probe of 0001:01:00.0 failed with error -5

So the device enumerates fine, but it's not able to reset the SATA
controller. That said, this seems to happen regardless of this patch
series, so plain v5.10-rc1 also shows the above.

Given the above, I think we should hold off on applying this series
until we've fixed PCI on linux-next and made sure that SATA also works
properly, otherwise we don't have a known good baseline to test this
against.

Thierry

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