Hi Bjorn, Thanks a lot for your comments! > -----Original Message----- > From: Bjorn Helgaas [mailto:helgaas@xxxxxxxxxx] > Sent: 2017年8月3日 5:12 > To: Z.q. Hou <zhiqiang.hou@xxxxxxx> > Cc: linux-pci@xxxxxxxxxxxxxxx; bhelgaas@xxxxxxxxxx; > jingoohan1@xxxxxxxxx; Joao.Pinto@xxxxxxxxxxxx; M.h. Lian > <minghuan.lian@xxxxxxx> > Subject: Re: [PATCH 3/3] PCI: layerscape: refactor the host_init function > > On Thu, Jul 06, 2017 at 02:33:49PM +0800, Zhiqiang Hou wrote: > > From: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx> > > > > Main changes: > > - Make the ls1021a's host_init reuse layerscape platform's common > > host_init function. > > - Will not use the outbound windows configured by bootloader, but > > introduce DWC common setup function dw_pcie_setup_rc and disable > > the bootloader configured outbound windows. And remove the duplicate > > class field fix code. > > This seems to have two or even three distinct changes mixed together. > Please split them into separate patches. In particular, you mention a class > code fix -- that should be its own separate patch. Yes, will split this patch. > > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx> > > Signed-off-by: Minghuan Lian <Minghuan.Lian@xxxxxxx> > > --- > > drivers/pci/dwc/pci-layerscape.c | 85 > > ++++++++++++++++++++++------------------ > > 1 file changed, 46 insertions(+), 39 deletions(-) > > > > diff --git a/drivers/pci/dwc/pci-layerscape.c > > b/drivers/pci/dwc/pci-layerscape.c > > index fd86128..9bed3cd 100644 > > --- a/drivers/pci/dwc/pci-layerscape.c > > +++ b/drivers/pci/dwc/pci-layerscape.c > > @@ -33,7 +33,8 @@ > > > > /* PEX Internal Configuration Registers */ > > #define PCIE_STRFMR1 0x71c /* Symbol Timer & Filter Mask > Register1 */ > > -#define PCIE_DBI_RO_WR_EN 0x8bc /* DBI Read-Only Write Enable > Register */ > > + > > +#define PCIE_IATU_NUM 6 > > > > struct ls_pcie_drvdata { > > u32 lut_offset; > > @@ -69,15 +70,9 @@ static void ls_pcie_clear_multifunction(struct > > ls_pcie *pcie) { > > struct dw_pcie *pci = pcie->pci; > > > > + dw_pcie_dbi_ro_wr_en(pci); > > iowrite8(PCI_HEADER_TYPE_BRIDGE, pci->dbi_base + > PCI_HEADER_TYPE); > > -} > > - > > -/* Fix class value */ > > -static void ls_pcie_fix_class(struct ls_pcie *pcie) -{ > > - struct dw_pcie *pci = pcie->pci; > > - > > - iowrite16(PCI_CLASS_BRIDGE_PCI, pci->dbi_base + PCI_CLASS_DEVICE); > > + dw_pcie_dbi_ro_wr_dis(pci); > > } > > > > /* Drop MSG TLP except for Vendor MSG */ @@ -91,6 +86,14 @@ static > > void ls_pcie_drop_msg_tlp(struct ls_pcie *pcie) > > iowrite32(val, pci->dbi_base + PCIE_STRFMR1); } > > > > +static void ls_pcie_disable_outbound_atus(struct ls_pcie *pcie) { > > + int i; > > + > > + for (i = 0; i < PCIE_IATU_NUM; i++) > > + dw_pcie_disable_atu(pcie->pci, DW_PCIE_REGION_OUTBOUND, i); } > > + > > static int ls1021_pcie_link_up(struct dw_pcie *pci) { > > u32 state; > > @@ -108,33 +111,6 @@ static int ls1021_pcie_link_up(struct dw_pcie *pci) > > return 1; > > } > > > > -static void ls1021_pcie_host_init(struct pcie_port *pp) -{ > > - struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > > - struct ls_pcie *pcie = to_ls_pcie(pci); > > - struct device *dev = pci->dev; > > - u32 index[2]; > > - > > - pcie->scfg = syscon_regmap_lookup_by_phandle(dev->of_node, > > - "fsl,pcie-scfg"); > > - if (IS_ERR(pcie->scfg)) { > > - dev_err(dev, "No syscfg phandle specified\n"); > > - pcie->scfg = NULL; > > - return; > > - } > > - > > - if (of_property_read_u32_array(dev->of_node, > > - "fsl,pcie-scfg", index, 2)) { > > - pcie->scfg = NULL; > > - return; > > - } > > - pcie->index = index[1]; > > - > > - dw_pcie_setup_rc(pp); > > - > > - ls_pcie_drop_msg_tlp(pcie); > > -} > > - > > static int ls_pcie_link_up(struct dw_pcie *pci) { > > struct ls_pcie *pcie = to_ls_pcie(pci); @@ -155,11 +131,42 @@ static > > void ls_pcie_host_init(struct pcie_port *pp) > > struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > > struct ls_pcie *pcie = to_ls_pcie(pci); > > > > - iowrite32(1, pci->dbi_base + PCIE_DBI_RO_WR_EN); > > - ls_pcie_fix_class(pcie); > > + /* > > + * Disable the outbound windows configured by bootloader to avoid > > + * one transaction hitting multiple outbound windows and the function > > + * dw_pcie_setup_rc will re-configure the outbound windows. > > + */ > > + ls_pcie_disable_outbound_atus(pcie); > > + > > ls_pcie_clear_multifunction(pcie); > > ls_pcie_drop_msg_tlp(pcie); > > - iowrite32(0, pci->dbi_base + PCIE_DBI_RO_WR_EN); > > + > > + dw_pcie_setup_rc(pp); > > +} > > + > > +static void ls1021_pcie_host_init(struct pcie_port *pp) { > > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > > + struct ls_pcie *pcie = to_ls_pcie(pci); > > + struct device *dev = pci->dev; > > + u32 index[2]; > > + > > + pcie->scfg = syscon_regmap_lookup_by_phandle(dev->of_node, > > + "fsl,pcie-scfg"); > > + if (IS_ERR(pcie->scfg)) { > > + dev_err(dev, "No syscfg phandle specified\n"); > > + pcie->scfg = NULL; > > + return; > > + } > > + > > + if (of_property_read_u32_array(dev->of_node, > > + "fsl,pcie-scfg", index, 2)) { > > + pcie->scfg = NULL; > > + return; > > + } > > + pcie->index = index[1]; > > + > > + ls_pcie_host_init(pp); > > } > > > > static int ls_pcie_msi_host_init(struct pcie_port *pp, > > -- > > 2.1.0.27.g96db324 > > Thanks, Zhiqiang
