diff options
Diffstat (limited to 'target/linux/bcm53xx/patches-4.3/144-PCI-iproc-Improve-link-detection-logic.patch')
| -rw-r--r-- | target/linux/bcm53xx/patches-4.3/144-PCI-iproc-Improve-link-detection-logic.patch | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-4.3/144-PCI-iproc-Improve-link-detection-logic.patch b/target/linux/bcm53xx/patches-4.3/144-PCI-iproc-Improve-link-detection-logic.patch new file mode 100644 index 0000000000..3fecba2b26 --- /dev/null +++ b/target/linux/bcm53xx/patches-4.3/144-PCI-iproc-Improve-link-detection-logic.patch @@ -0,0 +1,84 @@ +From aaf22ab4e916afa68a2e1aed4e913b76cbd58276 Mon Sep 17 00:00:00 2001 +From: Ray Jui <rjui@broadcom.com> +Date: Tue, 15 Sep 2015 17:39:19 -0700 +Subject: [PATCH 144/147] PCI: iproc: Improve link detection logic + +Improve the link detection logic by explicitly querying the link status +register to ensure link is active. + +Also force class to PCI_CLASS_BRIDGE_PCI (0x0604) through the host +configuration space register. + +Signed-off-by: Ray Jui <rjui@broadcom.com> +Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> +Reviewed-by: Anup Patel <anup.patel@broadcom.com> +Reviewed-by: Scott Branden <sbranden@broadcom.com> +--- + drivers/pci/host/pcie-iproc.c | 29 +++++++++++++++++++++++------ + 1 file changed, 23 insertions(+), 6 deletions(-) + +--- a/drivers/pci/host/pcie-iproc.c ++++ b/drivers/pci/host/pcie-iproc.c +@@ -60,6 +60,12 @@ + #define SYS_RC_INTX_EN 0x330 + #define SYS_RC_INTX_MASK 0xf + ++#define PCIE_LINK_STATUS_OFFSET 0xf0c ++#define PCIE_PHYLINKUP_SHIFT 3 ++#define PCIE_PHYLINKUP BIT(PCIE_PHYLINKUP_SHIFT) ++#define PCIE_DL_ACTIVE_SHIFT 2 ++#define PCIE_DL_ACTIVE BIT(PCIE_DL_ACTIVE_SHIFT) ++ + static inline struct iproc_pcie *iproc_data(struct pci_bus *bus) + { + struct iproc_pcie *pcie; +@@ -138,9 +144,15 @@ static void iproc_pcie_reset(struct ipro + static int iproc_pcie_check_link(struct iproc_pcie *pcie, struct pci_bus *bus) + { + u8 hdr_type; +- u32 link_ctrl; ++ u32 link_ctrl, class, val; + u16 pos, link_status; +- int link_is_active = 0; ++ bool link_is_active = false; ++ ++ val = readl(pcie->base + PCIE_LINK_STATUS_OFFSET); ++ if (!(val & PCIE_PHYLINKUP) || !(val & PCIE_DL_ACTIVE)) { ++ dev_err(pcie->dev, "PHY or data link is INACTIVE!\n"); ++ return -ENODEV; ++ } + + /* make sure we are not in EP mode */ + pci_bus_read_config_byte(bus, 0, PCI_HEADER_TYPE, &hdr_type); +@@ -150,14 +162,19 @@ static int iproc_pcie_check_link(struct + } + + /* force class to PCI_CLASS_BRIDGE_PCI (0x0604) */ +- pci_bus_write_config_word(bus, 0, PCI_CLASS_DEVICE, +- PCI_CLASS_BRIDGE_PCI); ++#define PCI_BRIDGE_CTRL_REG_OFFSET 0x43c ++#define PCI_CLASS_BRIDGE_MASK 0xffff00 ++#define PCI_CLASS_BRIDGE_SHIFT 8 ++ pci_bus_read_config_dword(bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, &class); ++ class &= ~PCI_CLASS_BRIDGE_MASK; ++ class |= (PCI_CLASS_BRIDGE_PCI << PCI_CLASS_BRIDGE_SHIFT); ++ pci_bus_write_config_dword(bus, 0, PCI_BRIDGE_CTRL_REG_OFFSET, class); + + /* check link status to see if link is active */ + pos = pci_bus_find_capability(bus, 0, PCI_CAP_ID_EXP); + pci_bus_read_config_word(bus, 0, pos + PCI_EXP_LNKSTA, &link_status); + if (link_status & PCI_EXP_LNKSTA_NLW) +- link_is_active = 1; ++ link_is_active = true; + + if (!link_is_active) { + /* try GEN 1 link speed */ +@@ -181,7 +198,7 @@ static int iproc_pcie_check_link(struct + pci_bus_read_config_word(bus, 0, pos + PCI_EXP_LNKSTA, + &link_status); + if (link_status & PCI_EXP_LNKSTA_NLW) +- link_is_active = 1; ++ link_is_active = true; + } + } + |