On Fri, 25 Dec 2009, TAXI wrote:
> BOUWSMA Barry schrieb:
> > Now rebuild the kernel or the dvb_usb_cxusb module, reboot or load
> > the new module, and try it and see if it is better.
> Great job, it works!
>
> Thank you so much :)
> Should we try the isoc transfer now?
Yes.
I wish I could find a clean patch that I used in the past -- but
it is hidden on a disk... somewhere... somewhere...
I may have to send an untested patch. Boy, I wish I could copy
and paste with my mouse :-)
Here is some source code which I have from 2005, with the ISOC
parameters that used to be used...
.generic_bulk_ctrl_endpoint = 0x01,
/* parameter for the MPEG2-data transfer */
.urb = {
.type = DVB_USB_ISOC,
.count = 5,
.endpoint = 0x02,
.u = {
.isoc = {
.framesperurb = 32,
.framesize = 940,
.interval = 5,
}
}
},
.num_device_descs = 1,
.devices = {
{ "Medion MD95700 (MDUSBTV-HYBRID)",
The idea is to fit this into the cxusb_medion_properties that
is probably near line 900 of your present source, plus or minus
however many changes there have been in the past five kernel
releases since my 2.6.27-rc4.
These are the lines which now look much like .type = USB_BULK,
and so on.
THIS IS NOT A CHANGE WHICH NORMAL USERS SHOULD TRY TO MAKE.
IT WILL ONLY WORK FOR THE ORIGINAL UN-MODDED MEDION 95700.
Of course, you will first want to
$ mv -iv cxusb.c cxusb.c-bulk-hack
$ cp -pvi cxusb.c-DIST cxusb.c
then make your changes to the unchanged original cxusb.c
In a later patch which I have intended to be compatible for all
users, I have this set somewhere else, with lines similar to
+#else
+/* XXX try to switch to using ISOC instead of BULK */
+/* XXX debug */ err("attempting to use isoc transfers on alt6 ep");
+ props->adapter->stream.type = USB_ISOC;
+ props->adapter->stream.u.isoc.framesperurb = 32;
+ props->adapter->stream.u.isoc.framesize = 940;
+ props->adapter->stream.u.isoc.interval = 5;
+
+#endif /* XXX HACK */
But this patch is very messy, and I must clean it up before I
can even think of posting it to the list...
I hope this can get you started, as I continue to search for a
simple patch which does the above, but correctly.
batty bouwsma
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