Am 2016-02-12 um 11:33 schrieb Henning Schild:
On Fri, 12 Feb 2016 11:22:17 +0100
Wolfgang Netbal <[email protected]> wrote:
Dear all,
I am using an imx6 controller where a FPGA-device is connected via
PCI express.
To use the FPGA in realtime I try to claim the IRQ 155 using
rtdm_irq_request() but the IRQ is hold by the linux domain.
It looks like the default driver claims the IRQ, but I have my own
driver that is linked to the device if we can trust the output of
lspci Has anyone of you an idea what could be the reason for this
issue or an idea how to fix it ?
If you want to use another driver for the device you have to unload the
driver currently in use, afterwards you should be able to claim the
device in your driver.
At runtime you can unbind the driver and keep the module loaded, or
just unload the module. To avoid the driver taking control by default
you have to blacklist the module in your distro, or disable it in your
kernel config.
What I tried right now is that I use the function free_irq()
in my driver when probing the device,
but I got an error that the IRQ is not used, so no free is needed.
It seems that the IRQ was claimed after the driver was loaded,
I thought that no other driver should assigned to the device
if a driver is still in use.
Additional I tried another kernel image I created in november,
with this image everything works fine.
So it looks like I have change some kernel configs to produce this error,
do you have a hint what config could be the reason for this ?
> cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
...
150: 39833 0 0 0 GIC
2188000.ethernet 151: 0 0 0
0 GIC 2188000.ethernet 155: 0 0
0 0 GIC PCIe PME ...
> lspci -v
00:00.0 PCI bridge: Device 16c3:abcd (rev 01) (prog-if 00 [Normal
decode]) Flags: bus master, fast devsel, latency 0
Memory at 01000000 (32-bit, non-prefetchable) [size=1M]
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
Memory behind bridge: 01100000-012fffff
[virtual] Expansion ROM at 01300000 [disabled] [size=64K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
Capabilities: [70] Express Root Port (Slot-), MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Kernel driver in use: pcieport
01:00.0 ACCESS Bus: Device 5112:0c00
Subsystem: Device 5112:0c00
Flags: bus master, fast devsel, latency 0, IRQ 155
Memory at 01100000 (32-bit, non-prefetchable) [size=1M]
Memory at 01200000 (32-bit, non-prefetchable) [size=1M]
Capabilities: [40] Power Management version 3
Capabilities: [48] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [58] Express Endpoint, MSI 00
Capabilities: [100] Device Serial Number 00-00-00-01-01-00-0a-35
Kernel driver in use: Sigmatek PCIE
Kind regards
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