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Date: Wed, 12 Dec 2018 13:43:28 +0800
From: Honghui Zhang <honghui.zhang@...iatek.com>
To: Jianjun Wang <jianjun.wang@...iatek.com>
CC: <ryder.lee@...iatek.com>, <bhelgaas@...gle.com>,
<robh+dt@...nel.org>, <lorenzo.pieralisi@....com>,
<matthias.bgg@...il.com>, <linux-pci@...r.kernel.org>,
<mark.rutland@....com>, <linux-mediatek@...ts.infradead.org>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <youlin.pei@...iatek.com>
Subject: Re: [PATCH 2/2] PCI: mediatek: Add controller support for MT7629
On Fri, 2018-12-07 at 20:56 +0800, Jianjun Wang wrote:
> On Thu, 2018-12-06 at 13:53 +0800, Honghui Zhang wrote:
> > On Thu, 2018-12-06 at 09:09 +0800, Jianjun Wang wrote:
> > > MT7629 is an arm platform SoC which has the same PCIe IP with MT7622.
> > >
> > > The read value of BAR0 is 0xffff_ffff, it's size will be calculated as 4GB
> > > in arm64 but bogus alignment values at arm32, the pcie device and devices
> >
> > :s /the pcie device /the bridge device
> >
> > > behind this bridge will not be enabled. Fix it's BAR0 resource size to
> > > guarantee the pcie devices will be enabled correctly.
> > >
> > > The HW default value of its device id is invalid, fix it's device id to
> > > match the hardware implementation.
> > >
> > > Signed-off-by: Jianjun Wang <jianjun.wang@...iatek.com>
> > > ---
> > > drivers/pci/controller/pcie-mediatek.c | 26 ++++++++++++++++++++++++++
> > > include/linux/pci_ids.h | 1 +
> > > 2 files changed, 27 insertions(+)
> > >
> > > diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
> > > index d20cf461ba00..f8937cc3c87c 100644
> > > --- a/drivers/pci/controller/pcie-mediatek.c
> > > +++ b/drivers/pci/controller/pcie-mediatek.c
> > > @@ -73,6 +73,7 @@
> > > #define PCIE_MSI_VECTOR 0x0c0
> > >
> > > #define PCIE_CONF_VEND_ID 0x100
> > > +#define PCIE_CONF_DEVICE_ID 0x102
> > > #define PCIE_CONF_CLASS_ID 0x106
> > >
> > > #define PCIE_INT_MASK 0x420
> > > @@ -135,12 +136,14 @@ struct mtk_pcie_port;
> > > /**
> > > * struct mtk_pcie_soc - differentiate between host generations
> > > * @need_fix_class_id: whether this host's class ID needed to be fixed or not
> > > + * @need_fix_device_id: whether this host's device ID needed to be fixed or not
> > > * @ops: pointer to configuration access functions
> > > * @startup: pointer to controller setting functions
> > > * @setup_irq: pointer to initialize IRQ functions
> > > */
> > > struct mtk_pcie_soc {
> > > bool need_fix_class_id;
> > > + bool need_fix_device_id;
> > > struct pci_ops *ops;
> > > int (*startup)(struct mtk_pcie_port *port);
> > > int (*setup_irq)(struct mtk_pcie_port *port, struct device_node *node);
> > > @@ -692,6 +695,11 @@ static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
> > > writew(val, port->base + PCIE_CONF_CLASS_ID);
> > > }
> > >
> > > + if (soc->need_fix_device_id) {
> > > + val = PCI_DEVICE_ID_MEDIATEK_7629;
> > > + writew(val, port->base + PCIE_CONF_DEVICE_ID);
> > > + }
> > > +
> > > /* 100ms timeout value should be enough for Gen1/2 training */
> > > err = readl_poll_timeout(port->base + PCIE_LINK_STATUS_V2, val,
> > > !!(val & PCIE_PORT_LINKUP_V2), 20,
> > > @@ -1238,11 +1246,29 @@ static const struct mtk_pcie_soc mtk_pcie_soc_mt7622 = {
> > > .setup_irq = mtk_pcie_setup_irq,
> > > };
> > >
> > > +static const struct mtk_pcie_soc mtk_pcie_soc_mt7629 = {
> > > + .need_fix_class_id = true,
> > > + .need_fix_device_id = true,
> > > + .ops = &mtk_pcie_ops_v2,
> > > + .startup = mtk_pcie_startup_port_v2,
> > > + .setup_irq = mtk_pcie_setup_irq,
> > > +};
> > > +
> > > +static void mtk_fixup_bar_size(struct pci_dev *dev)
> > > +{
> > > + struct resource *dev_res = &dev->resource[0];
> > > + /* 32bit resource length will calculate size to 0, set it smaller */
> > > + dev_res->end = 0xfffffffe;
> > > +}
> >
> > I'm not sure assign the BAR0 size in driver to fit in the bogus
> > alignment is a good idea. Seems the size value of 0xffff_fffe also is an
> > arbitrary value.
> > Do we have a chance to change the resource framework code to make it
> > adopt this scenario?
I have take a look at the resource assign routine, it's better keep it
in current way.
Thanks.
> >
> > Thanks.
>
> I'm afraid not, the resource size length defined by phys_addr_t, which
> related to the hardware's physical address length.
> It will be much more better if the BAR0 size is not related with the
> pcie to axi window, when we set the window to 4GB, the BAR0 size still
> have initial value, and we can set the BAR0 size value or just disable
> it independently.
> The BAR0 size value need bigger than the MMIO space size, so the
> software will think it's a invalid resource but not a bogus alignment
> one, since we can't disable the BAR0 by hardware, and the flow of enable
> devices will keep going.
> >
> > > +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MEDIATEK, PCI_DEVICE_ID_MEDIATEK_7629,
> > > + mtk_fixup_bar_size);
> > > +
> > > static const struct of_device_id mtk_pcie_ids[] = {
> > > { .compatible = "mediatek,mt2701-pcie", .data = &mtk_pcie_soc_v1 },
> > > { .compatible = "mediatek,mt7623-pcie", .data = &mtk_pcie_soc_v1 },
> > > { .compatible = "mediatek,mt2712-pcie", .data = &mtk_pcie_soc_mt2712 },
> > > { .compatible = "mediatek,mt7622-pcie", .data = &mtk_pcie_soc_mt7622 },
> > > + { .compatible = "mediatek,mt7629-pcie", .data = &mtk_pcie_soc_mt7629 },
> > > {},
> > > };
> > >
> > > diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
> > > index 69f0abe1ba1a..77b278bac3a8 100644
> > > --- a/include/linux/pci_ids.h
> > > +++ b/include/linux/pci_ids.h
> > > @@ -2126,6 +2126,7 @@
> > > #define PCI_VENDOR_ID_MYRICOM 0x14c1
> > >
> > > #define PCI_VENDOR_ID_MEDIATEK 0x14c3
> > > +#define PCI_DEVICE_ID_MEDIATEK_7629 0x7629
> > >
> > > #define PCI_VENDOR_ID_TITAN 0x14D2
> > > #define PCI_DEVICE_ID_TITAN_010L 0x8001
> >
> >
>
>
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