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V4L/DVB (12938): SAA7164: Increase the firmware command timeout to avoid firmware errors. 

The firmware typically responds in < 50ms and, via the interrupts and
deferred work queue the caller (blocked in the driver) is signalled very
efficiently. In a highly stressed system this can take many multiples
of seconds. So, we need a larger maximum timeout for busy systems.

Signed-off-by: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Steven Toth 2009-08-08 10:22:02 -03:00 committed by Mauro Carvalho Chehab
parent 2ceae8fdfa
commit bbf504c37d
2 changed files with 7 additions and 1 deletions
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6
drivers/media/video/saa7164/saa7164-cmd.c
View File

@ -234,6 +234,12 @@ int saa7164_cmd_wait(struct saa7164_dev *dev, u8 seqno)
__func__, seqno, dev->cmds[seqno].signalled);
/* Wait for signalled to be flagged or timeout */
/* In a highly stressed system this can easily extend
* into multiple seconds before the deferred worker
* is scheduled, and we're woken up via signal.
* We typically are signalled in < 50ms but it can
* take MUCH longer.
*/
wait_event_timeout(*q, dev->cmds[seqno].signalled, (HZ * waitsecs));
r = time_before(jiffies, stamp + (HZ * waitsecs));
if (r)

2
drivers/media/video/saa7164/saa7164-core.c
View File

@ -49,7 +49,7 @@ unsigned int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "enable debug messages");
unsigned int waitsecs = 1;
unsigned int waitsecs = 10;
module_param(waitsecs, int, 0644);
MODULE_PARM_DESC(debug, "timeout on firmware messages");