RE: [PATCHv4 25/28] PCI: mobiveil: ls_pcie_g4: add Workaround for A-011577
From: Z.q. Hou
Date: Wed Mar 13 2019 - 10:51:28 EST
Hi All,
Please ignore this patch, rev1.0 will not be production.
Thanks,
Zhiqiang
> -----Original Message-----
> From: Z.q. Hou
> Sent: 2019年3月11日 17:33
> To: linux-pci@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> bhelgaas@xxxxxxxxxx; robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx;
> l.subrahmanya@xxxxxxxxxxxxxx; shawnguo@xxxxxxxxxx; Leo Li
> <leoyang.li@xxxxxxx>; lorenzo.pieralisi@xxxxxxx;
> catalin.marinas@xxxxxxx; will.deacon@xxxxxxx
> Cc: Mingkai Hu <mingkai.hu@xxxxxxx>; M.h. Lian
> <minghuan.lian@xxxxxxx>; Xiaowei Bao <xiaowei.bao@xxxxxxx>; Z.q. Hou
> <zhiqiang.hou@xxxxxxx>
> Subject: [PATCHv4 25/28] PCI: mobiveil: ls_pcie_g4: add Workaround for
> A-011577
>
> From: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
>
> PCIe configuration access to non-existent function triggered SERROR interrupt
> exception.
>
> Workaround:
> Disable error reporting on AXI bus during the Vendor ID read transactions in
> enumeration.
>
> This ERRATA is only for LX2160A Rev1.0, and it will be fixed in Rev2.0.
>
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> ---
> V4:
> - no change
>
> .../controller/mobiveil/pci-layerscape-gen4.c | 37
> +++++++++++++++++++ .../controller/mobiveil/pcie-mobiveil-host.c | 17
> ++++++++-
> .../pci/controller/mobiveil/pcie-mobiveil.h | 3 ++
> 3 files changed, 56 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/controller/mobiveil/pci-layerscape-gen4.c
> b/drivers/pci/controller/mobiveil/pci-layerscape-gen4.c
> index 174cbcac4059..d2c5dbbd5e3c 100644
> --- a/drivers/pci/controller/mobiveil/pci-layerscape-gen4.c
> +++ b/drivers/pci/controller/mobiveil/pci-layerscape-gen4.c
> @@ -22,8 +22,13 @@
>
> #include "pcie-mobiveil.h"
>
> +#define REV_1_0 (0x10)
> +
> /* LUT and PF control registers */
> #define PCIE_LUT_OFF (0x80000)
> +#define PCIE_LUT_GCR (0x28)
> +#define PCIE_LUT_GCR_RRE (0)
> +
> #define PCIE_PF_OFF (0xc0000)
> #define PCIE_PF_INT_STAT (0x18)
> #define PF_INT_STAT_PABRST (31)
> @@ -41,6 +46,7 @@ struct ls_pcie_g4 {
> struct mobiveil_pcie *pci;
> struct delayed_work dwork;
> int irq;
> + u8 rev;
> };
>
> static inline u32 ls_pcie_g4_lut_readl(struct ls_pcie_g4 *pcie, u32 off) @@
> -76,6 +82,15 @@ static bool ls_pcie_g4_is_bridge(struct ls_pcie_g4 *pcie)
> return header_type == PCI_HEADER_TYPE_BRIDGE; }
>
> +static int ls_pcie_g4_host_init(struct mobiveil_pcie *pci) {
> + struct ls_pcie_g4 *pcie = to_ls_pcie_g4(pci);
> +
> + pcie->rev = csr_readb(pci, PCI_REVISION_ID);
> +
> + return 0;
> +}
> +
> static int ls_pcie_g4_link_up(struct mobiveil_pcie *pci) {
> struct ls_pcie_g4 *pcie = to_ls_pcie_g4(pci); @@ -188,12 +203,34 @@
> static void ls_pcie_g4_reset(struct work_struct *work)
> ls_pcie_g4_reinit_hw(pcie);
> }
>
> +static int ls_pcie_g4_read_other_conf(struct pci_bus *bus, unsigned int
> devfn,
> + int where, int size, u32 *val)
> +{
> + struct mobiveil_pcie *pci = bus->sysdata;
> + struct ls_pcie_g4 *pcie = to_ls_pcie_g4(pci);
> + int ret;
> +
> + if (pcie->rev == REV_1_0 && where == PCI_VENDOR_ID)
> + ls_pcie_g4_lut_writel(pcie, PCIE_LUT_GCR,
> + 0 << PCIE_LUT_GCR_RRE);
> +
> + ret = pci_generic_config_read(bus, devfn, where, size, val);
> +
> + if (pcie->rev == REV_1_0 && where == PCI_VENDOR_ID)
> + ls_pcie_g4_lut_writel(pcie, PCIE_LUT_GCR,
> + 1 << PCIE_LUT_GCR_RRE);
> +
> + return ret;
> +}
> +
> static struct mobiveil_rp_ops ls_pcie_g4_rp_ops = {
> .interrupt_init = ls_pcie_g4_interrupt_init,
> + .read_other_conf = ls_pcie_g4_read_other_conf,
> };
>
> static const struct mobiveil_pab_ops ls_pcie_g4_pab_ops = {
> .link_up = ls_pcie_g4_link_up,
> + .host_init = ls_pcie_g4_host_init,
> };
>
> static int __init ls_pcie_g4_probe(struct platform_device *pdev) diff --git
> a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> index e8d0c4989013..5f51bc2dd6d7 100644
> --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> @@ -79,9 +79,20 @@ static void __iomem *mobiveil_pcie_map_bus(struct
> pci_bus *bus,
> return pcie->rp.config_axi_slave_base + where; }
>
> +static int mobiveil_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
> + int where, int size, u32 *val) {
> + struct mobiveil_pcie *pcie = bus->sysdata;
> + struct root_port *rp = &pcie->rp;
> +
> + if (bus->number > rp->root_bus_nr && rp->ops->read_other_conf)
> + return rp->ops->read_other_conf(bus, devfn, where, size, val);
> +
> + return pci_generic_config_read(bus, devfn, where, size, val); }
> static struct pci_ops mobiveil_pcie_ops = {
> .map_bus = mobiveil_pcie_map_bus,
> - .read = pci_generic_config_read,
> + .read = mobiveil_pcie_config_read,
> .write = pci_generic_config_write,
> };
>
> @@ -309,6 +320,10 @@ int mobiveil_host_init(struct mobiveil_pcie *pcie,
> bool reinit)
> value |= (PCI_CLASS_BRIDGE_PCI << 16);
> csr_writel(pcie, value, PAB_INTP_AXI_PIO_CLASS);
>
> + /* Platform specific host init */
> + if (pcie->ops->host_init)
> + return pcie->ops->host_init(pcie);
> +
> return 0;
> }
>
> diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> index 0ccd6cee5f8f..ab43de5e4b2b 100644
> --- a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
> @@ -145,6 +145,8 @@ struct mobiveil_msi { /* MSI information
> */
>
> struct mobiveil_rp_ops {
> int (*interrupt_init)(struct mobiveil_pcie *pcie);
> + int (*read_other_conf)(struct pci_bus *bus, unsigned int devfn,
> + int where, int size, u32 *val);
> };
>
> struct root_port {
> @@ -160,6 +162,7 @@ struct root_port {
>
> struct mobiveil_pab_ops {
> int (*link_up)(struct mobiveil_pcie *pcie);
> + int (*host_init)(struct mobiveil_pcie *pcie);
> };
>
> struct mobiveil_pcie {
> --
> 2.17.1