Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-20 02:51:44 +00:00
Code Issues Packages Projects Releases Wiki Activity

tty: serial: mpc5xxx: fix PSC clock name bug

Browse Source 
mpc512x platform clock code names PSC clocks as "pscX_mclk" but
the driver tries to get "pscX_clk" clock and this results in
errors like:

  mpc52xx-psc-uart 80011700.psc: Failed to get PSC clock entry!

The problem appears when opening ttyPSC devices other than the
system's serial console. Since getting and enabling the PSC clock
fails, uart port startup doesn't succeed and tty flag TTY_IO_ERROR
remains set causing further errors in tty ioctls, i.e.
'strace stty -F /dev/ttyPSC1' shows:

open("/dev/ttyPSC1", O_RDONLY|O_NONBLOCK|O_LARGEFILE) = 3
dup2(3, 0)                              = 0
close(3)                                = 0
fcntl64(0, F_GETFL)                     = 0x10800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE)
fcntl64(0, F_SETFL, O_RDONLY|O_LARGEFILE) = 0
ioctl(0, TCGETS, 0xbff89038)            = -1 EIO (Input/output error)

Only request PSC clock names that the platform actually provides.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anatolij Gustschin 2013-03-09 12:43:54 +01:00 committed by Greg Kroah-Hartman
parent 34dcfb8479
commit 09081e5b47
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/tty/serial/mpc52xx_uart.c
View File

@ -550,7 +550,7 @@ static int mpc512x_psc_clock(struct uart_port *port, int enable)
return 0;
psc_num = (port->mapbase & 0xf00) >> 8;
snprintf(clk_name, sizeof(clk_name), "psc%d_clk", psc_num);
snprintf(clk_name, sizeof(clk_name), "psc%d_mclk", psc_num);
psc_clk = clk_get(port->dev, clk_name);
if (IS_ERR(psc_clk)) {
dev_err(port->dev, "Failed to get PSC clock entry!\n");