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Date: Fri, 13 Aug 2021 16:22:40 +0100
From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To: Bjorn Helgaas <helgaas@...nel.org>,
Chuanjia Liu <chuanjia.liu@...iatek.com>
Cc: robh+dt@...nel.org, bhelgaas@...gle.com, matthias.bgg@...il.com,
ryder.lee@...iatek.com, jianjun.wang@...iatek.com,
yong.wu@...iatek.com, Frank Wunderlich <frank-w@...lic-files.de>,
linux-pci@...r.kernel.org, linux-mediatek@...ts.infradead.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 2/4] PCI: mediatek: Add new method to get shared
pcie-cfg base address and parse node
On Tue, Aug 10, 2021 at 02:42:50PM -0500, Bjorn Helgaas wrote:
> On Mon, Jul 19, 2021 at 03:34:54PM +0800, Chuanjia Liu wrote:
> > For the new dts format, add a new method to get
> > shared pcie-cfg base address and parse node.
>
> This commit log doesn't seem to really cover what's going on here. It
> looks like:
>
> - You added a check for "mediatek,generic-pciecfg" (I guess this is
> the "shared pcie-cfg base address" part). Probably could have
> been its own patch.
>
> - You added checks for "interrupt-names" and "pcie_irq". Not
> explained in commit log; probably could have been its own patch,
> too.
>
> - You now look for "linux,pci-domain" (via of_get_pci_domain_nr()).
> If present, you parse only one port instead of looking for all the
> children of the node.
>
> That's sort of weird behavior -- why should the presence of
> "linux,pci-domain" determine whether the node can have children?
> Is that really what you intend?
>
> Should be explained in the commit log and could have been its own
> patch, too.
I agree with Bjorn, this patch should be split (and commit logs
rewritten). I will drop it from my tree, waiting for a v12.
Lorenzo
> > Signed-off-by: Chuanjia Liu <chuanjia.liu@...iatek.com>
> > Acked-by: Ryder Lee <ryder.lee@...iatek.com>
> > ---
> > drivers/pci/controller/pcie-mediatek.c | 52 +++++++++++++++++++-------
> > 1 file changed, 39 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
> > index 25bee693834f..928e0983a900 100644
> > --- a/drivers/pci/controller/pcie-mediatek.c
> > +++ b/drivers/pci/controller/pcie-mediatek.c
> > @@ -14,6 +14,7 @@
> > #include <linux/irqchip/chained_irq.h>
> > #include <linux/irqdomain.h>
> > #include <linux/kernel.h>
> > +#include <linux/mfd/syscon.h>
> > #include <linux/msi.h>
> > #include <linux/module.h>
> > #include <linux/of_address.h>
> > @@ -23,6 +24,7 @@
> > #include <linux/phy/phy.h>
> > #include <linux/platform_device.h>
> > #include <linux/pm_runtime.h>
> > +#include <linux/regmap.h>
> > #include <linux/reset.h>
> >
> > #include "../pci.h"
> > @@ -207,6 +209,7 @@ struct mtk_pcie_port {
> > * struct mtk_pcie - PCIe host information
> > * @dev: pointer to PCIe device
> > * @base: IO mapped register base
> > + * @cfg: IO mapped register map for PCIe config
> > * @free_ck: free-run reference clock
> > * @mem: non-prefetchable memory resource
> > * @ports: pointer to PCIe port information
> > @@ -215,6 +218,7 @@ struct mtk_pcie_port {
> > struct mtk_pcie {
> > struct device *dev;
> > void __iomem *base;
> > + struct regmap *cfg;
> > struct clk *free_ck;
> >
> > struct list_head ports;
> > @@ -650,7 +654,11 @@ static int mtk_pcie_setup_irq(struct mtk_pcie_port *port,
> > return err;
> > }
> >
> > - port->irq = platform_get_irq(pdev, port->slot);
> > + if (of_find_property(dev->of_node, "interrupt-names", NULL))
> > + port->irq = platform_get_irq_byname(pdev, "pcie_irq");
> > + else
> > + port->irq = platform_get_irq(pdev, port->slot);
> > +
> > if (port->irq < 0)
> > return port->irq;
> >
> > @@ -682,6 +690,10 @@ static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
> > val |= PCIE_CSR_LTSSM_EN(port->slot) |
> > PCIE_CSR_ASPM_L1_EN(port->slot);
> > writel(val, pcie->base + PCIE_SYS_CFG_V2);
> > + } else if (pcie->cfg) {
> > + val = PCIE_CSR_LTSSM_EN(port->slot) |
> > + PCIE_CSR_ASPM_L1_EN(port->slot);
> > + regmap_update_bits(pcie->cfg, PCIE_SYS_CFG_V2, val, val);
> > }
> >
> > /* Assert all reset signals */
> > @@ -985,6 +997,7 @@ static int mtk_pcie_subsys_powerup(struct mtk_pcie *pcie)
> > struct device *dev = pcie->dev;
> > struct platform_device *pdev = to_platform_device(dev);
> > struct resource *regs;
> > + struct device_node *cfg_node;
> > int err;
> >
> > /* get shared registers, which are optional */
> > @@ -995,6 +1008,14 @@ static int mtk_pcie_subsys_powerup(struct mtk_pcie *pcie)
> > return PTR_ERR(pcie->base);
> > }
> >
> > + cfg_node = of_find_compatible_node(NULL, NULL,
> > + "mediatek,generic-pciecfg");
> > + if (cfg_node) {
> > + pcie->cfg = syscon_node_to_regmap(cfg_node);
> > + if (IS_ERR(pcie->cfg))
> > + return PTR_ERR(pcie->cfg);
> > + }
> > +
> > pcie->free_ck = devm_clk_get(dev, "free_ck");
> > if (IS_ERR(pcie->free_ck)) {
> > if (PTR_ERR(pcie->free_ck) == -EPROBE_DEFER)
> > @@ -1027,22 +1048,27 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie)
> > struct device *dev = pcie->dev;
> > struct device_node *node = dev->of_node, *child;
> > struct mtk_pcie_port *port, *tmp;
> > - int err;
> > + int err, slot;
> > +
> > + slot = of_get_pci_domain_nr(dev->of_node);
> > + if (slot < 0) {
> > + for_each_available_child_of_node(node, child) {
> > + err = of_pci_get_devfn(child);
> > + if (err < 0) {
> > + dev_err(dev, "failed to get devfn: %d\n", err);
> > + goto error_put_node;
> > + }
> >
> > - for_each_available_child_of_node(node, child) {
> > - int slot;
> > + slot = PCI_SLOT(err);
> >
> > - err = of_pci_get_devfn(child);
> > - if (err < 0) {
> > - dev_err(dev, "failed to parse devfn: %d\n", err);
> > - goto error_put_node;
> > + err = mtk_pcie_parse_port(pcie, child, slot);
> > + if (err)
> > + goto error_put_node;
> > }
> > -
> > - slot = PCI_SLOT(err);
> > -
> > - err = mtk_pcie_parse_port(pcie, child, slot);
> > + } else {
> > + err = mtk_pcie_parse_port(pcie, node, slot);
> > if (err)
> > - goto error_put_node;
> > + return err;
> > }
> >
> > err = mtk_pcie_subsys_powerup(pcie);
> > --
> > 2.18.0
> >
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