linux-kernel - Re: [PATCH] PCI: controller: dwc: Make PCI

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Date:   Thu, 06 Dec 2018 10:10:43 +0200
From:   Baruch Siach <baruch@...s.co.il>
To:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Robert Hancock <hancock@...systems.ca>
Cc:     linux-pci@...r.kernel.org, "A.s. Dong" <aisheng.dong@....com>,
        Richard Zhu <hongxing.zhu@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-imx@....com, bhelgaas@...gle.com,
        Leonard Crestez <leonard.crestez@....com>, cphealy@...il.com,
        l.stach@...gutronix.de, Trent Piepho <tpiepho@...inj.com>
Subject: Re: [PATCH] PCI: controller: dwc: Make PCI_IMX6 depend on PCIEPORTBUS

Hi Andrey,

Adding Robert Hancock who reported[1] on a PCIe MSI issue with i.MX6.

Andrey Smirnov writes:

> Building a kernel with CONFIG_PCI_IMX6=y, but CONFIG_PCIEPORTBUS=n
> produces a system where built-in PCIE bridge (16c3:abcd) isn't bound
> to pcieport driver. This, in turn, results in a PCIE bus that is
> capable of enumerating attached PCIE device, but lacks functional
> interrupt support.

Robert, does that fix your issue?

> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> ---
>
> Assuming this is a reasonable dependency, shold this be done to more
> than just i.MX6 driver?
>
>  drivers/pci/controller/dwc/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
> index 2b139acccf32..44ededbeab85 100644
> --- a/drivers/pci/controller/dwc/Kconfig
> +++ b/drivers/pci/controller/dwc/Kconfig
> @@ -92,6 +92,7 @@ config PCI_IMX6
>  	bool "Freescale i.MX6 PCIe controller"
>  	depends on SOC_IMX8MQ || SOC_IMX6Q || (ARM && COMPILE_TEST)
>  	depends on PCI_MSI_IRQ_DOMAIN
> +	depends on PCIEPORTBUS

This effectively disables PCIe in imx_v6_v7_defconfig, since
CONFIG_PCIEPORTBUS is not enabled there. Maybe do 'select' instead?

>  	Select PCIE_DW_HOST
>
>  config PCIE_SPEAR13XX

baruch

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2018-November/614800.html

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