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serial: fix serial_cs I/O windows for Argosy RS-COM 2P 

Current serial_cs driver has a problem when trying to detect whether
a card has multiple ports: serial_config() calls pcmcia_loop_config()
which iterates over card CIS configurations by calling
serial_check_for_multi() for each of them.

This function wants to check (and select) a configuration
that has either one long I/O window spanning multiple ports or two 8-port
windows for two serial ports.

Problem is, that every pcmcia_loop_config() iteration only updates
the windows (via pcmcia_do_loop_config() in resource[0] and resource[1])
when CONF_AUTO_SET_IO flag is set on the device, which is set only later
in the code.

Fix it by setting this flag earlier.

In addition to this, when multi-port card is detected
and it does not have an one, long I/O window
multi_config_check_notpicky() tries to locate two I/O windows and assumes
they are continuous without checking.

On an Argosy RS-COM 2P this selects first configuration, which
unfortunately has two non-continuous I/O windows.
The net effect is that the second serial port on the card does not work.

Fix it by checking whether the windows are really continuous.

Signed-off-by: Maciej Szmigiero <mhej@o2.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Maciej Szmigiero 2011-12-01 22:39:22 +01:00 committed by Greg Kroah-Hartman
parent 7d73aaf1d4
commit 7f97c000e8
1 changed files with 4 additions and 4 deletions
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8
drivers/tty/serial/serial_cs.c
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@ -317,7 +317,7 @@ static int serial_probe(struct pcmcia_device *link)
info->p_dev = link;
link->priv = info;
link->config_flags |= CONF_ENABLE_IRQ;
link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
if (do_sound)
link->config_flags |= CONF_ENABLE_SPKR;
@ -445,7 +445,7 @@ static int simple_config(struct pcmcia_device *link)
/* First pass: look for a config entry that looks normal.
* Two tries: without IO aliases, then with aliases */
link->config_flags |= CONF_AUTO_SET_VPP | CONF_AUTO_SET_IO;
link->config_flags |= CONF_AUTO_SET_VPP;
for (try = 0; try < 4; try++)
if (!pcmcia_loop_config(link, simple_config_check, &try))
goto found_port;
@ -501,7 +501,8 @@ static int multi_config_check_notpicky(struct pcmcia_device *p_dev,
{
int *base2 = priv_data;
if (!p_dev->resource[0]->end || !p_dev->resource[1]->end)
if (!p_dev->resource[0]->end || !p_dev->resource[1]->end ||
p_dev->resource[0]->start + 8 != p_dev->resource[1]->start)
return -ENODEV;
p_dev->resource[0]->end = p_dev->resource[1]->end = 8;
@ -520,7 +521,6 @@ static int multi_config(struct pcmcia_device *link)
struct serial_info *info = link->priv;
int i, base2 = 0;
link->config_flags |= CONF_AUTO_SET_IO;
/* First, look for a generic full-sized window */
if (!pcmcia_loop_config(link, multi_config_check, &info->multi))
base2 = link->resource[0]->start + 8;