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

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Message-ID: <1498701623.32475.9.camel@mtkswgap22>
Date:   Thu, 29 Jun 2017 10:00:23 +0800
From:   Ryder Lee <ryder.lee@...iatek.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
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 Wed, 2017-06-28 at 14:53 -0500, Bjorn Helgaas wrote:
> 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

You're right! These flags are not needed and should be removed.
Thanks for catching that.

Ryder