I am working on an application involving the davinci using the vpif. My
board file has the inputs configured to use VPIF_IF_RAW_BAYER if_type.
When my application starts up, I have it enumerate the formats
(VIDIOC_ENUM_FMT) and it indicates that the only available format is
"YCbCr4:2:2 YC Planar" (from vpif_enum_fmt_vid_cap). It looks to me
that the culprit is vpif_open().
struct channel_obj.vpifparams.iface is initialized at vpif_probe() time
in the function vpif_set_input. Open the device file (/dev/video0)
overwrites this. I suspect that it is __not__ supposed to do this,
since I don't see any method for restoring the iface.
I'm using linux-3.10.4, but the problem appears in 3.10.9, 3.11.rc7 and
a version I checked out at
https://git.kernel.org/cgit/linux/kernel/git/nsekhar/linux-davinci.git.
I have supplied a patch for 3.10.9.
diff -pubwr
linux-3.10.9-pristine/drivers/media/platform/davinci/vpif_capture.c
linux-3.10.9/drivers/media/platform/davinci/vpif_capture.c
--- linux-3.10.9-pristine/drivers/media/platform/davinci/vpif_capture.c
2013-08-20 17:40:47.000000000 -0500
+++ linux-3.10.9/drivers/media/platform/davinci/vpif_capture.c
2013-08-30 11:18:29.000000000 -0500
@@ -914,9 +914,11 @@ static int vpif_open(struct file *filep)
fh->initialized = 0;
/* If decoder is not initialized. initialize it */
if (!ch->initialized) {
+ struct vpif_interface iface = ch->vpifparams.iface;
fh->initialized = 1;
ch->initialized = 1;
memset(&(ch->vpifparams), 0, sizeof(struct vpif_params));
+ ch->vpifparams.iface = iface;
}
/* Increment channel usrs counter */
ch->usrs++;
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