Hi,
I'm using a Technisat Skystar HD2 (DVB-S2) with a CI Module under Ubuntu
11.04.
As some people already noticed, the mantis_ca_init() is never called to
initialize the CAM.
Since s2-liplianin used almost the same code, I basically just put the
mantis_ca_init back in,
which is working quite good. But I hope somebody can help me to remove a
bug rendering the driver not SMP safe,
since I believe my work around for this makes the driver less reliable.
First of all the description of the bug:
I'm using a dual core cpu and noticed that I don't get all the interrupt
i should get when writing to/ reading from the card using a function
which uses "mantis_hif_sbuf_opdone_wait" in "mantis_hif.c".
This leads to the 500 ms timeout. Interesting enough, when reading the
data despite the timeout, the data is valid and available. Using
max_cpus=1 parameter when starting ubuntu 11.04 solves the problem; all
interrupts are received and no timeout occurs.
In addition to this, i think the return value of "msecs_to_jiffies"
changed with some kernel update an thus "mantis_hif_sbuf_opdone_wait"
never returns an error.
How hope someone can help figuraing out, why the card send less
interrupt on SMP enabled machines. I know the core which handles the IRQ
can change, but even all the IRQs from all core are less than when
disabling SMP.
Now the description how I added the CI support again:
File mantis_hif.c (workaround for the SMP bug):
- Change the call from msecs_to_jiffies(500) to msecs_to_jiffies(2) in
function "mantis_hif_sbuf_opdone_wait" (we just get the data after 2 ms,
regardless if we got the data ready IRQ or not).
File mantis_pci.c:
- Move the function set_direction from mantis_core.c to mantis_pci.c (I
tried to just add the forward declaration to mantis_core.h, but I
couldn't get it to work...)
- Add its function declaration to mantis_pci.h (extern void
mantis_set_direction(struct mantis_pci *mantis, int direction);).
- Add "mantis_set_direction(mantis, 0);" after "mantis->revision =
pdev->revision;" in function "mantis_pci_init".
- Add "mmwrite(0x00, MANTIS_INT_MASK);" before "err =
request_irq(pdev->irq,"... in function "mantis_pci_init".
File mantis_ca.c:
- Add the include #include "mantis_pci.h"
- Comment in "mantis_set_direction(mantis, 1);" in function
"mantis_ts_control" in file mantis_ca.c
File manits_dvb.c:
- Add the function call "mantis_ca_init(mantis);" right before the
return 0 in function "mantis_dvb_init".
- Add th function call "mantis_ca_exit(mantis);" right before
"tasklet_kill(&mantis->tasklet);" in function "mantis_dvb_exit".
Regards,
Manuel
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
