linux-kernel - Re: [PATCH] PCI: dwc: Added link up check in map_bus of dw_child_pcie

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Message-ID: <20201008150819.GA3871@e121166-lin.cambridge.arm.com>
Date:   Thu, 8 Oct 2020 16:08:19 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Rob Herring <robh@...nel.org>,
        Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>,
        "Z.q. Hou" <zhiqiang.hou@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        PCI <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Michael Walle <michael@...le.cc>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH] PCI: dwc: Added link up check in map_bus of
 dw_child_pcie_ops

On Thu, Oct 01, 2020 at 07:02:04PM +0530, Kishon Vijay Abraham I wrote:

[...]

> >> Yeah, I don't see any registers in the DRA7x PCIe wrapper for disabling
> >> error forwarding.
> > 
> > It's a DWC port logic register AFAICT, but perhaps not present in all versions.
> 
> Okay. I see there's a register PCIECTRL_PL_AXIS_SLV_ERR_RESP which has a
> reset value of 0.
> 
> It has four bit-fields, RESET_TIMEOUT_ERR_MAP, NO_VID_ERR_MAP,
> DBI_ERR_MAP and SLAVE_ERR_MAP. I'm not seeing any difference in behavior
> if I set all these bits. Maybe it requires platform support too. I'll
> check this with our design team.
> 
> Meanwhile would it be okay to add linkup check atleast for DRA7X so that
> we could have it booting in linux-next?

Do you mind sending a patch on top of my pci/dwc please ?

Thanks,
Lorenzo