diff options
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/8250/8250_pci.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index 1541554262df..e55f18b93fe7 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -1823,6 +1823,9 @@ static int pci_eg20t_init(struct pci_dev *dev) #endif } +#define PCI_DEVICE_ID_EXAR_XR17V4358 0x4358 +#define PCI_DEVICE_ID_EXAR_XR17V8358 0x8358 + static int pci_xr17c154_setup(struct serial_private *priv, const struct pciserial_board *board, @@ -1832,6 +1835,15 @@ pci_xr17c154_setup(struct serial_private *priv, return pci_default_setup(priv, board, port, idx); } +static inline int +xr17v35x_has_slave(struct serial_private *priv) +{ + const int dev_id = priv->dev->device; + + return ((dev_id == PCI_DEVICE_ID_EXAR_XR17V4358) || + (dev_id == PCI_DEVICE_ID_EXAR_XR17V8358)); +} + static int pci_xr17v35x_setup(struct serial_private *priv, const struct pciserial_board *board, @@ -1846,6 +1858,13 @@ pci_xr17v35x_setup(struct serial_private *priv, port->port.flags |= UPF_EXAR_EFR; /* + * Setup the uart clock for the devices on expansion slot to + * half the clock speed of the main chip (which is 125MHz) + */ + if (xr17v35x_has_slave(priv) && idx >= 8) + port->port.uartclk = (7812500 * 16 / 2); + + /* * Setup Multipurpose Input/Output pins. */ if (idx == 0) { @@ -1998,9 +2017,6 @@ pci_wch_ch38x_setup(struct serial_private *priv, #define PCIE_DEVICE_ID_WCH_CH382_2S1P 0x3250 #define PCIE_DEVICE_ID_WCH_CH384_4S 0x3470 -#define PCI_DEVICE_ID_EXAR_XR17V4358 0x4358 -#define PCI_DEVICE_ID_EXAR_XR17V8358 0x8358 - /* Unknown vendors/cards - this should not be in linux/pci_ids.h */ #define PCI_SUBDEVICE_ID_UNKNOWN_0x1584 0x1584 #define PCI_SUBDEVICE_ID_UNKNOWN_0x1588 0x1588 |