diff options
| author |   Johan Hovold <johan@kernel.org> | 2021-01-27 12:00:28 +0100 |
|---|---|---|
| committer | Johan Hovold <johan@kernel.org> | 2021-02-01 14:06:27 +0100 |
| commit | 1ef268039b79945a9284dbc34eedcbad21415106 (patch) | |
| tree | 50fceae98cdad97c3236160366fdb92b01079409 /drivers/usb/serial/ftdi_sio.c | |
| parent | USB: serial: ftdi_sio: fix FTX sub-integer prescaler (diff) | |
| download | linux-dev-1ef268039b79945a9284dbc34eedcbad21415106.tar.xz linux-dev-1ef268039b79945a9284dbc34eedcbad21415106.zip | |
USB: serial: ftdi_sio: restore divisor-encoding comments
Add back a few explanatory comments related to the divisor encoding
which got lost in a coding-style clean up many years ago.
Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/usb/serial/ftdi_sio.c')
| -rw-r--r-- | drivers/usb/serial/ftdi_sio.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index 4168801b9595..d61703d858a1 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -1153,13 +1153,13 @@ static unsigned short int ftdi_232am_baud_base_to_divisor(int baud, int base) divisor = divisor3 >> 3; divisor3 &= 0x7; if (divisor3 == 1) - divisor |= 0xc000; + divisor |= 0xc000; /* +0.125 */ else if (divisor3 >= 4) - divisor |= 0x4000; + divisor |= 0x4000; /* +0.5 */ else if (divisor3 != 0) - divisor |= 0x8000; + divisor |= 0x8000; /* +0.25 */ else if (divisor == 1) - divisor = 0; /* special case for maximum baud rate */ + divisor = 0; /* special case for maximum baud rate */ return divisor; } @@ -1177,9 +1177,9 @@ static u32 ftdi_232bm_baud_base_to_divisor(int baud, int base) divisor = divisor3 >> 3; divisor |= (u32)divfrac[divisor3 & 0x7] << 14; /* Deal with special cases for highest baud rates. */ - if (divisor == 1) + if (divisor == 1) /* 1.0 */ divisor = 0; - else if (divisor == 0x4001) + else if (divisor == 0x4001) /* 1.5 */ divisor = 1; return divisor; } @@ -1201,9 +1201,9 @@ static u32 ftdi_2232h_baud_base_to_divisor(int baud, int base) divisor = divisor3 >> 3; divisor |= (u32)divfrac[divisor3 & 0x7] << 14; /* Deal with special cases for highest baud rates. */ - if (divisor == 1) + if (divisor == 1) /* 1.0 */ divisor = 0; - else if (divisor == 0x4001) + else if (divisor == 0x4001) /* 1.5 */ divisor = 1; /* * Set this bit to turn off a divide by 2.5 on baud rate generator |