Stefan Lucke a écrit :
> On Montag 09 Oktober 2006 10:26, Nicolas Huillard wrote:
>
>>Mark Adams a écrit :
>>
>>>>First : I still have field parity problems with interlaced material on
>>>>interlaced TV.
>>>
>>>Always, sometimes, coming and going, or just the odd glitch?
>>
>>"Coming and going".
>>Defined as : "On the same stream, parity can be OK for a few seconds up
>>to the minute, and then goes wrong, for a similar period. Pausing the
>>stream can get it right again. Or not."
>
> That looks more like some interrupts are lost.
> Is VGA IRQ shared with other devices (/proc/interrupts) ?
Please excuse me for this late answer. I didn't check that post on the
DFB ML.
IRQ 11 is shared with USB (not used) and eth (heavily used, but not when
I watch TV....):
11: 23638023 XT-PIC uhci_hcd:usb1, viafb, eth0
Answer to Mark : it's not a multiprocessor system ("SMP alternatives:
switching to UP code"; "Freeing SMP alternatives: 0k freed")
When modprobing viafb, it report the following IRQ (dmesg):
viafb: irq handler installed, IRQ(0x200) = 80080c02
I actually see those high IRQ numbers on other hosts, when the APIC is
enabled:
185: 30244076 IO-APIC-level eth0
On the EPIA VDR host, dmesg says :
No local APIC present or hardware disabled
mapped APIC to ffffd000 (011c1000)
Should it be that I have partly working IRQ routing. My kernel is
self-compiled 2.6.17 (from Debian source package).
> The other driver mentioned here:
> http://mail.directfb.org/pipermail/directfb-users/2006-September/002189.html
>
> is using spin_locks() during interrupt processing :
>
> + spin_lock(&par->irq_lock);
> + status = VIA_GET_MMIO(VIA_REG_INTERRUPT);
> + if (status & VIA_IRQ_VBI_PENDING) {
> + VIA_SET_MMIO(VIA_REG_INTERRUPT, status | VIA_IRQ_VBI_PENDING);
> + wake_up_interruptible(&par->irq_queue);
> + par->irq_count++;
> + handled = 1;
> + } else {
> + handled = 0;
> + }
> + spin_unlock(&par->irq_lock);
>
> In both cases I do not understand the logic in
> a. testing a bit
> b. writing back value with tested bit set
--
NH
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