When using /dev/reboot, the MSI vecor might have already
been setup causing interrupts to fire on the designated
cpu while we send the commands to the card.
reseting irbsts bits in hdacmd() only works
while interrupts are disabled during hdareset().
once interrupts are enabled we need to reset the
irbsts bits in the interrupt handler or else the
interrupt never clears and locks up the system.
the driver was not using irb interrupts
and was just polling the irb write pointer
to wait for command completion.
this is not supported by qemu.
qemu requires the use of irb interrupt handshake
and it refuses to accept the next command until we
acknowledge the irb interrupt.
The new pci code is moved to port/pci.[hc] and shared by
all ports.
Each port has its own PCI controller implementation,
providing the pcicfgrw*() functions for low level pci
config space access. The locking for pcicfgrw*() is now
done by the caller (only port/pci.c).
Device drivers now need to include "../port/pci.h" in
addition to "io.h".
The new code now checks bridge windows and membars,
while enumerating the bus, giving the pc driver a chance
to re-assign them. This is needed because some UEFI
implementations fail to assign the bars for some devices,
so we need to do it outselfs. (See pcireservemem()).
While working on this, it was discovered that the pci
code assimed the smallest I/O bar size is 16 (pcibarsize()),
which is wrong. I/O bars can be as small as 4 bytes.
Bit 1 in an I/O bar is also reserved and should be masked off,
making the port mask: port = bar & ~3;
Based on OpenBSD driver:
- /sys/dev/pci/azalia.c rev 1.209
- /sys/dev/pci/pcidevs rev 1.1689
- only tested on amd64; machine is an Acer V5-573G
exact model: V5-573G-74518G1Takk
the automatic routing from jack to dac/adc sometimes gets us
a path thats not audible. manually specifying a route path
gets us arround these. the syntax is just a comma separated
list of node ids in the "pin" and "inpin" audioctl commands
instead of a single pin node id.
to find alternative paths, audiostat now lists all the widgets;
not just the pins; and ther input connections.
initially mute all pins and amps of all function groups.
connectpath() and disconnectpath() will mute and unmute
the widgets as required later.
some controls are inverted. we reflect this by specifying
negative range in the volume table now and let genaudiovolread()
and genaudiovolwrite() do the conversion.
widgets that do not have Wampovrcap have ther default
amplifier parameters stored in the aydio function group.
only if the amp override bit is *not* set, then the widget
stores its own amplifier parameters and we have to query
its node id, otherwise the audio function group node id.
