Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d685a483b8c92e3d0580b6c28e2ed531391c8c46
Commit: d685a483b8c92e3d0580b6c28e2ed531391c8c46
Parent: a19602f26a24c32e491108b49790b106a6351f24
Author: Brett T. Warden <[EMAIL PROTECTED]>
AuthorDate: Thu Jan 10 04:33:31 2008 -0300
Committer: Mauro Carvalho Chehab <[EMAIL PROTECTED]>
CommitDate: Fri Jan 25 19:04:51 2008 -0200
V4L/DVB (7013): bw-qcam: add module parameter 'force_init' to skip polite
auto-detection prior to direct initialization
Setting force_init=1 bypasses the friendly auto-detection by polling the
status register, and instead attempts to initialize the qcam directly. Not
friendly to other parallel devices, but much more reliable than the
auto-detection.
Signed-off-by: Brett T. Warden <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Mauro Carvalho Chehab <[EMAIL PROTECTED]>
---
drivers/media/video/bw-qcam.c | 10 +++++++++-
1 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/drivers/media/video/bw-qcam.c b/drivers/media/video/bw-qcam.c
index 5842352..0322653 100644
--- a/drivers/media/video/bw-qcam.c
+++ b/drivers/media/video/bw-qcam.c
@@ -82,11 +82,16 @@ OTHER DEALINGS IN THE SOFTWARE.
static unsigned int maxpoll=250; /* Maximum busy-loop count for qcam I/O */
static unsigned int yieldlines=4; /* Yield after this many during capture */
static int video_nr = -1;
+static unsigned int force_init; /* Whether to probe
aggressively */
module_param(maxpoll, int, 0);
module_param(yieldlines, int, 0);
module_param(video_nr, int, 0);
+/* Set force_init=1 to avoid detection by polling status register and
+ * immediately attempt to initialize qcam */
+module_param(force_init, int, 0);
+
static inline int read_lpstatus(struct qcam_device *q)
{
return parport_read_status(q->pport);
@@ -331,6 +336,9 @@ static int qc_detect(struct qcam_device *q)
int count = 0;
int i;
+ if (force_init)
+ return 1;
+
lastreg = reg = read_lpstatus(q) & 0xf0;
for (i = 0; i < 500; i++)
@@ -354,12 +362,12 @@ static int qc_detect(struct qcam_device *q)
/* Be (even more) liberal in what you accept... */
-/* if (count > 30 && count < 200) */
if (count > 20 && count < 400) {
return 1; /* found */
} else {
printk(KERN_ERR "No Quickcam found on port %s\n",
q->pport->name);
+ printk(KERN_DEBUG "Quickcam detection counter: %u\n", count);
return 0; /* not found */
}
}
-
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
