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authorManu Abraham <manu@kromtek.com>2005-05-05 16:16:01 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-05 16:36:44 -0700
commitfc9d53af37deeb830252f03c62724078d943686c (patch)
tree95e018111ee1db5657100077a25fa5d7d416d676
parent2ef41634def0fcb0def3e3c90220c651ca478cb3 (diff)
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[PATCH] bttv: fix dst i2c read/write timeout failure.
Attached is a patch to bttv which fixes the following problems. Affected cards and problems: ~~~~~~~~~~~~~~~~~~~~~~~~ o VP-1020 (200103A) Tuning problems, device detection. o VP-1020 (DST-MOT) Errors during tuning, device detection fails in a while. o VP-1030 (DST-CI) Tuning sometimes fails after CI commands. o VP-2031 (DCT-CI) Tuning problems The timeout happens before the actual timeout occured in the MCU on the board, and hence the problems. Changes: (bttv-i2c.diff) ~~~~~~~~~~~~~~~~~~~~~~~~ o Changed the custom wait queue to wait_event_interruptible_timeout() - Suggestion by Johannes Stezenbach. o Fixed the wait queue timeout problem - This fixes the timeout problem on various cards. - This problem was visible as many * Cannot tune to channels, when signal levels are very low. * app_info does not work in some conditions for CI based cards - Smaller values worked good for newer cards, but the older cards suffered, settled down to the worst case values that could happen in any eventuality. Signed-off-by: Manu Abraham <manu@kromtek.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/media/video/bttv-i2c.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/drivers/media/video/bttv-i2c.c b/drivers/media/video/bttv-i2c.c
index e42f1ec13f3..e3f477dff82 100644
--- a/drivers/media/video/bttv-i2c.c
+++ b/drivers/media/video/bttv-i2c.c
@@ -29,6 +29,7 @@
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
+#include <linux/jiffies.h>
#include <asm/io.h>
#include "bttvp.h"
@@ -130,17 +131,14 @@ static u32 functionality(struct i2c_adapter *adap)
static int
bttv_i2c_wait_done(struct bttv *btv)
{
- DECLARE_WAITQUEUE(wait, current);
int rc = 0;
- add_wait_queue(&btv->i2c_queue, &wait);
- if (0 == btv->i2c_done)
- msleep_interruptible(20);
- remove_wait_queue(&btv->i2c_queue, &wait);
+ /* timeout */
+ if (wait_event_interruptible_timeout(btv->i2c_queue,
+ btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS)
+
+ rc = -EIO;
- if (0 == btv->i2c_done)
- /* timeout */
- rc = -EIO;
if (btv->i2c_done & BT848_INT_RACK)
rc = 1;
btv->i2c_done = 0;