diff options
Diffstat (limited to 'target/linux/imx6/patches-3.14/208-ventana-plx-allow-override-gpio-output-mask.patch')
| -rw-r--r-- | target/linux/imx6/patches-3.14/208-ventana-plx-allow-override-gpio-output-mask.patch | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/target/linux/imx6/patches-3.14/208-ventana-plx-allow-override-gpio-output-mask.patch b/target/linux/imx6/patches-3.14/208-ventana-plx-allow-override-gpio-output-mask.patch new file mode 100644 index 0000000000..7c2d1b0936 --- /dev/null +++ b/target/linux/imx6/patches-3.14/208-ventana-plx-allow-override-gpio-output-mask.patch @@ -0,0 +1,58 @@ +This patch allows passing in the gpio output mask used for GPIO0-7 on the +PLX PCIe bridge. These GPIO's are used for PERST# on the downstream ports. + +Allowing the kernel to override the default configuration allows for keeping +specific devices held in reset. One important use of this is to allow +temporarily disabling devices that may request too many resources such as +an unprogrammed i210 device. + +--- a/arch/arm/mach-imx/mach-imx6q.c ++++ b/arch/arm/mach-imx/mach-imx6q.c +@@ -84,6 +84,7 @@ static int ksz9031rn_phy_fixup(struct ph + * fixup for PLX PEX8909 bridge to configure GPIO1-7 as output High + * as they are used for slots1-7 PERST# + */ ++unsigned int ventana_plx_gpio = 0xfe; + static void ventana_pciesw_early_fixup(struct pci_dev *dev) + { + u32 dw; +@@ -95,19 +96,25 @@ static void ventana_pciesw_early_fixup(s + return; + + pci_read_config_dword(dev, 0x62c, &dw); ++ dev_info(&dev->dev, "de-asserting downstream PERST# 0x%04x\n", ++ ventana_plx_gpio); + dw |= 0xaaa8; // GPIO1-7 outputs + pci_write_config_dword(dev, 0x62c, dw); +- +- pci_read_config_dword(dev, 0x644, &dw); +- dw |= 0xfe; // GPIO1-7 output high +- pci_write_config_dword(dev, 0x644, dw); +- ++ pci_write_config_dword(dev, 0x644, ventana_plx_gpio); + msleep(100); + } + DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8609, ventana_pciesw_early_fixup); + DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8606, ventana_pciesw_early_fixup); + DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8604, ventana_pciesw_early_fixup); + ++static int __init setup_ventana_plx_gpio(char *str) ++{ ++ get_option(&str, &ventana_plx_gpio); ++ ++ return 0; ++} ++early_param("plx_gpio", setup_ventana_plx_gpio); ++ + static int ar8031_phy_fixup(struct phy_device *dev) + { + u16 val; +@@ -308,7 +315,7 @@ static void __init imx6q_init_irq(void) + irqchip_init(); + } + +-static const char *imx6q_dt_compat[] __initconst = { ++static const char *imx6q_dt_compat[] __initdata = { + "fsl,imx6dl", + "fsl,imx6q", + NULL, |