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Message-ID: <1541645630.11281.18.camel@mhfsdcap03>
Date: Thu, 8 Nov 2018 10:53:50 +0800
From: Honghui Zhang <honghui.zhang@...iatek.com>
To: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC: <bhelgaas@...gle.com>, <linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>, <linux-pci@...r.kernel.org>,
<ryder.lee@...iatek.com>, <linux-kernel@...r.kernel.org>,
<youlin.pei@...iatek.com>, <yt.shen@...iatek.com>,
<jianjun.wang@...iatek.com>
Subject: Re: [PATCH] PCI: mediatek: Use
devm_of_pci_get_host_bridge_resources() to parse DT
On Wed, 2018-11-07 at 12:03 +0000, Lorenzo Pieralisi wrote:
> On Thu, Oct 18, 2018 at 11:23:34AM +0800, honghui.zhang@...iatek.com wrote:
> > From: Honghui Zhang <honghui.zhang@...iatek.com>
> >
> > Use the devm_of_pci_get_host_bridge_resources() API in place of the PCI OF
> > DT parser.
> >
> > Signed-off-by: Honghui Zhang <honghui.zhang@...iatek.com>
> > ---
> > drivers/pci/controller/pcie-mediatek.c | 109 +++++++++------------------------
> > 1 file changed, 29 insertions(+), 80 deletions(-)
> >
> > diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
> > index 2a1f97c..6632d4e 100644
> > --- a/drivers/pci/controller/pcie-mediatek.c
> > +++ b/drivers/pci/controller/pcie-mediatek.c
> > @@ -197,29 +197,20 @@ struct mtk_pcie_port {
> > * @dev: pointer to PCIe device
> > * @base: IO mapped register base
> > * @free_ck: free-run reference clock
> > - * @io: IO resource
> > - * @pio: PIO resource
> > * @mem: non-prefetchable memory resource
> > - * @busn: bus range
> > - * @offset: IO / Memory offset
> > * @ports: pointer to PCIe port information
> > * @soc: pointer to SoC-dependent operations
> > + * @busnr: root bus number
> > */
> > struct mtk_pcie {
> > struct device *dev;
> > void __iomem *base;
> > struct clk *free_ck;
> >
> > - struct resource io;
> > - struct resource pio;
> > struct resource mem;
> > - struct resource busn;
> > - struct {
> > - resource_size_t mem;
> > - resource_size_t io;
> > - } offset;
> > struct list_head ports;
> > const struct mtk_pcie_soc *soc;
> > + int busnr;
>
> If you move the code initializing and probing the pci_host_bridge into
> mtk_pcie_setup() (and rename that function) this variable becomes
> useless. It should be an unsigned int, by the way.
Yes, I can directly assign the busnr to host->busnr in the
mtk_pcie_setup and remove this variable.
Thanks.
>
> > };
> >
> > static void mtk_pcie_subsys_powerdown(struct mtk_pcie *pcie)
> > @@ -1045,55 +1036,42 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie)
> > {
> > struct device *dev = pcie->dev;
> > struct device_node *node = dev->of_node, *child;
> > - struct of_pci_range_parser parser;
> > - struct of_pci_range range;
> > - struct resource res;
> > struct mtk_pcie_port *port, *tmp;
> > + struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
> > + struct list_head *windows = &host->windows;
> > + struct resource_entry *win, *tmp_win;
> > + resource_size_t io_base;
> > int err;
> >
> > - if (of_pci_range_parser_init(&parser, node)) {
> > - dev_err(dev, "missing \"ranges\" property\n");
> > - return -EINVAL;
> > - }
> > + err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff,
> > + windows, &io_base);
> > + if (err)
> > + return err;
> >
> > - for_each_of_pci_range(&parser, &range) {
> > - err = of_pci_range_to_resource(&range, node, &res);
> > - if (err < 0)
> > - return err;
> > + err = devm_request_pci_bus_resources(dev, windows);
> > + if (err < 0)
> > + return err;
> >
> > - switch (res.flags & IORESOURCE_TYPE_BITS) {
> > + /* Get the I/O and memory ranges from DT */
> > + resource_list_for_each_entry_safe(win, tmp_win, windows) {
> > + switch (resource_type(win->res)) {
> > case IORESOURCE_IO:
> > - pcie->offset.io = res.start - range.pci_addr;
> > -
> > - memcpy(&pcie->pio, &res, sizeof(res));
> > - pcie->pio.name = node->full_name;
> > -
> > - pcie->io.start = range.cpu_addr;
> > - pcie->io.end = range.cpu_addr + range.size - 1;
> > - pcie->io.flags = IORESOURCE_MEM;
> > - pcie->io.name = "I/O";
> > -
> > - memcpy(&res, &pcie->io, sizeof(res));
> > - break;
> > -
> > + err = devm_pci_remap_iospace(dev, win->res, io_base);
> > + if (err) {
> > + dev_warn(dev, "error %d: failed to map resource %pR\n",
> > + err, win->res);
> > + resource_list_destroy_entry(win);
> > + }
>
> Missing a break.
Thanks.
>
> > case IORESOURCE_MEM:
> > - pcie->offset.mem = res.start - range.pci_addr;
> > -
> > - memcpy(&pcie->mem, &res, sizeof(res));
> > + memcpy(&pcie->mem, win->res, sizeof(*win->res));
> > pcie->mem.name = "non-prefetchable";
> > break;
> > + case IORESOURCE_BUS:
> > + pcie->busnr = win->res->start;
> > + break;
> > }
> > }
> >
> > - err = of_pci_parse_bus_range(node, &pcie->busn);
> > - if (err < 0) {
> > - dev_err(dev, "failed to parse bus ranges property: %d\n", err);
> > - pcie->busn.name = node->name;
> > - pcie->busn.start = 0;
> > - pcie->busn.end = 0xff;
> > - pcie->busn.flags = IORESOURCE_BUS;
> > - }
> > -
> > for_each_available_child_of_node(node, child) {
> > int slot;
> >
> > @@ -1125,28 +1103,6 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie)
> > return 0;
> > }
> >
> > -static int mtk_pcie_request_resources(struct mtk_pcie *pcie)
> > -{
> > - struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
> > - struct list_head *windows = &host->windows;
> > - struct device *dev = pcie->dev;
> > - int err;
> > -
> > - pci_add_resource_offset(windows, &pcie->pio, pcie->offset.io);
> > - pci_add_resource_offset(windows, &pcie->mem, pcie->offset.mem);
> > - pci_add_resource(windows, &pcie->busn);
> > -
> > - err = devm_request_pci_bus_resources(dev, windows);
> > - if (err < 0)
> > - return err;
> > -
> > - err = devm_pci_remap_iospace(dev, &pcie->pio, pcie->io.start);
> > - if (err < 0)
> > - return err;
> > -
> > - return 0;
> > -}
> > -
> > static int mtk_pcie_probe(struct platform_device *pdev)
> > {
> > struct device *dev = &pdev->dev;
> > @@ -1169,11 +1125,7 @@ static int mtk_pcie_probe(struct platform_device *pdev)
> > if (err)
> > return err;
> >
> > - err = mtk_pcie_request_resources(pcie);
> > - if (err)
> > - goto put_resources;
> > -
> > - host->busnr = pcie->busn.start;
> > + host->busnr = pcie->busnr;
> > host->dev.parent = pcie->dev;
> > host->ops = pcie->soc->ops;
> > host->map_irq = of_irq_parse_and_map_pci;
> > @@ -1181,12 +1133,9 @@ static int mtk_pcie_probe(struct platform_device *pdev)
> > host->sysdata = pcie;
> >
> > err = pci_host_probe(host);
> > - if (err)
> > - goto put_resources;
> > -
> > - return 0;
> > + if (!err)
> > + return 0;
> >
>
> No, leave the error path.
>
> err = pci_host_probe(host);
> if (err)
> goto put_resources;
>
> return 0;
> put_resources:
> ...
>
> it is easier to follow.
>
OK.
I will revert this snippet in the next version.
Thanks.
> Thanks,
> Lorenzo
>
> > -put_resources:
> > if (!list_empty(&pcie->ports))
> > mtk_pcie_put_resources(pcie);
> >
> > --
> > 2.6.4
> >
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