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USB: serial: ftdi_sio: assume hi-speed type

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In preparation for adding further Hi-Speed types, assume a 120 MHz clock
and set the channel index by default and instead override these values
as needed for legacy types.

Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2022-09-11 16:02:14 +02:00
parent a146cc4d46
commit 4d50f4fc67
1 changed files with 12 additions and 11 deletions
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23
drivers/usb/serial/ftdi_sio.c
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@ -1551,13 +1551,15 @@ static int ftdi_determine_type(struct usb_serial_port *port)
version = le16_to_cpu(udev->descriptor.bcdDevice);
ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
priv->baud_base = 48000000 / 2;
priv->channel = 0;
/* Assume Hi-Speed type */
priv->baud_base = 120000000 / 2;
priv->channel = CHANNEL_A + ifnum;
switch (version) {
case 0x200:
priv->chip_type = FT232A;
priv->baud_base = 48000000 / 2;
priv->channel = 0;
/*
* FT232B devices have a bug where bcdDevice gets set to 0x200
* when iSerialNumber is 0. Assume it is an FT232B in case the
@ -1570,37 +1572,36 @@ static int ftdi_determine_type(struct usb_serial_port *port)
break;
case 0x400:
priv->chip_type = FT232B;
priv->baud_base = 48000000 / 2;
priv->channel = 0;
break;
case 0x500:
priv->chip_type = FT2232C;
priv->channel = CHANNEL_A + ifnum;
priv->baud_base = 48000000 / 2;
break;
case 0x600:
priv->chip_type = FT232R;
priv->baud_base = 48000000 / 2;
priv->channel = 0;
break;
case 0x700:
priv->chip_type = FT2232H;
priv->channel = CHANNEL_A + ifnum;
priv->baud_base = 120000000 / 2;
break;
case 0x800:
priv->chip_type = FT4232H;
priv->channel = CHANNEL_A + ifnum;
priv->baud_base = 120000000 / 2;
break;
case 0x900:
priv->chip_type = FT232H;
priv->channel = CHANNEL_A + ifnum;
priv->baud_base = 120000000 / 2;
break;
case 0x1000:
priv->chip_type = FTX;
priv->channel = CHANNEL_A + ifnum;
priv->baud_base = 48000000 / 2;
break;
default:
if (version < 0x200) {
priv->chip_type = SIO;
priv->baud_base = 12000000 / 16;
priv->channel = 0;
} else {
dev_err(&port->dev, "unknown device type: 0x%02x\n", version);
return -ENODEV;