linux-kernel - Re: Regression: 442ec4c04d1: PCI: dwc: all: Split struct pcie

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Date:   Tue, 9 May 2017 07:21:24 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Peter Senna Tschudin <peter.senna@...labora.com>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Richard Zhu <hongxing.zhu@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Murali Karicheri <m-karicheri2@...com>,
        Minghuan Lian <minghuan.Lian@...escale.com>,
        Mingkai Hu <mingkai.hu@...escale.com>,
        Roy Zang <tie-fei.zang@...escale.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Niklas Cassel <niklas.cassel@...s.com>,
        Jesper Nilsson <jesper.nilsson@...s.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Zhou Wang <wangzhou1@...ilicon.com>,
        Gabriele Paoloni <gabriele.paoloni@...wei.com>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Pratyush Anand <pratyush.anand@...il.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Tim Harvey <tharvey@...eworks.com>
Subject: Re: Regression: 442ec4c04d1: PCI: dwc: all: Split struct pcie_port
 into host-only and core structures

Hi Peter,

On Tue, May 9, 2017 at 3:34 AM, Peter Senna Tschudin
<peter.senna@...labora.com> wrote:

> Something that ocurred to me is that u-boot is initializing the PCI, and
> the PCI networkd cards.  Ideally this should not affect anything, but
> can this be related to the issue?

Yes, in order to narrow things down: please boot 4.11 without PCI
support in U-Boot.

The problem is that mx6q does not have a way to properly reset the PCI block.

On the board I tested there is no PCI support in U-Boot.

Maybe we need the following approach in U-Boot as Lucas did for Barebox:
https://git.pengutronix.de/cgit/barebox/commit/?id=f1da98da2760c21487bbba8f7fb957c843a22896

According to this patch that went into 4.11 the bootloader must put
PCI back in a safe state:
https://patchwork.kernel.org/patch/9528911