linux-kernel - Re: [PATCH v5 1/2] PCI: mediatek: Add Mediatek PCIe host controller support

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Message-ID: <20170628195325.GR17844@bhelgaas-glaptop.roam.corp.google.com>
Date:   Wed, 28 Jun 2017 14:53:26 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Ryder Lee <ryder.lee@...iatek.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, devicetree@...r.kernel.org,
        Red Hung <red.hung@...iatek.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 1/2] PCI: mediatek: Add Mediatek PCIe host controller
 support

On Sun, May 21, 2017 at 11:42:24AM +0800, Ryder Lee wrote:
> Add support for the Mediatek PCIe Gen2 controller which can
> be found on MT7623 series SoCs.
> 
> Signed-off-by: Ryder Lee <ryder.lee@...iatek.com>
> ---
>  drivers/pci/host/Kconfig         |  11 +
>  drivers/pci/host/Makefile        |   1 +
>  drivers/pci/host/pcie-mediatek.c | 553 +++++++++++++++++++++++++++++++++++++++
>  3 files changed, 565 insertions(+)
>  create mode 100644 drivers/pci/host/pcie-mediatek.c
>...

> +static int mtk_pcie_register_host(struct pci_host_bridge *host)
> +{
> +	struct mtk_pcie *pcie = pci_host_bridge_priv(host);
> +	struct pci_bus *child;
> +	int err;
> +
> +	pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS);

Do you really need the PCI_REASSIGN_ALL_RSRC and PCI_REASSIGN_ALL_BUS
flags?  I'd like to get rid of them because we should automatically
assign resources if the firmware hasn't done it.

Bjorn