linux-kernel - Re: PCIE

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Date:	Thu, 24 May 2007 03:03:55 +0400
From:	Manu Abraham <abraham.manu@...il.com>
To:	Roland Dreier <rdreier@...co.com>
CC:	Greg KH <greg@...ah.com>, linux-pci@...ey.karlin.mff.cuni.cz,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: PCIE

Roland Dreier wrote:
>  > If i uncomment the saa716x_read or write, what i get is a solid freeze
>  > on module load. If i leave it commented out, the module loads fine.
> 
> That sounds like a typical bug during driver development... you're
> probably wedging the hardware by doing the wrong access.
> 
> I didn't see the source for saa716x_read or write in the code you
> posted, so it's hard to say if there's a problem with them.
> 

Attaching saa716x_read/write in saa716x_priv.h

> Is your interrupt handler getting called?  Is the device generating
> interrupts?

It looks so, from the logs. The only problem is i can't disable the
interrupts, if i write "0" to 0x500, the interrupt/enable register, it
gives me a solid freeze. If i read from the handler, commenting out the
disable interrupts in init, that read also gives me a solid freeze. This
lead me to think that there could be some problem with the MMIO block
access.


May 23 03:25:48 manu-04 kernel: [  383.602737] saa716x_pci_init: found a
Twinhan VP-6090 device
May 23 03:25:48 manu-04 kernel: [  383.602764] ACPI: PCI Interrupt
0000:06:00.0[A] -> GSI 16 (level, low) -> IRQ 16
May 23 03:25:48 manu-04 kernel: [  383.603020]      SAA7160/1/2 Rev 1
[1822:0027], irq: 16, latency: 0
May 23 03:25:48 manu-04 kernel: [  383.603024]      memory: 0x32200000,
mmio: 0xe046e000
May 23 03:25:48 manu-04 kernel: [  383.610761] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.624056] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.637348] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.650650] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.663951] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.677253] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.690554] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.703858] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.717156] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.730459] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.743760] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.757064] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.770364] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.783665] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.796966] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.810269] === Interrupts[0010] [] ==
May 23 03:25:48 manu-04 kernel: [  383.823569] === Interrupts[0010] [] ==


> 
>  > That part is then fine. Does MSI require any special tinkering ?
> 
> Just pci_enable_msi() as usual.

Thanks


Regards,
Manu


View attachment "saa716x_priv.h" of type "text/plain" (2653 bytes)