renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-16 17:23:55 +08:00
Code

Revert "usb: pl2303: add two comments concerning the supported baud rates with HX chips"

Browse Source 
This reverts commit c23bda365d.

Revert all of the pl2303 changes that went into 3.12-rc1 and -rc2 as
they cause regressions on some versions of the chip.  This will all be
revisited for later kernel versions when we can figure out how to handle
this in a way that does not break working devices.

Reported-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Frank Schäfer <fschaefer.oss@googlemail.com>
Acked-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2013-11-01 09:18:25 -07:00
parent 281393ad0b
commit 233c3dda5c
1 changed files with 0 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/usb/serial/pl2303.c
View File

@ -281,12 +281,6 @@ static int pl2303_baudrate_encode_direct(int baud, enum pl2303_type type,
4800, 7200, 9600, 14400, 19200, 28800, 38400,
57600, 115200, 230400, 460800, 614400, 921600,
1228800, 2457600, 3000000, 6000000 };
/*
* NOTE: The PL2303HX (tested with rev. 3A) also supports the following
* baud rates: 128000, 134400, 161280, 201600, 268800, 403200, 806400.
* As long as we are not using this encoding method for them, there is
* no point in complicating the code to support them.
*/
int i;
/* Set baudrate to nearest supported value */
@ -400,12 +394,6 @@ static void pl2303_encode_baudrate(struct tty_struct *tty,
* => supported by all chip types
* 2) Divisor based method: encodes a divisor to a base value (12MHz*32)
* => supported by HX chips (and likely not by type_0/1 chips)
*
* NOTE: Although the divisor based baud rate encoding method is much
* more flexible, some of the standard baud rate values can not be
* realized exactly. But the difference is very small (max. 0.2%) and
* the device likely uses the same baud rate generator for both methods
* so that there is likley no difference.
*/
if (type != HX)
baud = pl2303_baudrate_encode_direct(baud, type, buf);