linux-kernel - Re: 2.6.22-rc: regression: no irda0 interface (2.6.21 was OK), smsc does not find chip

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Message-Id: <200706301847.33834.arvidjaar@mail.ru>
Date:	Sat, 30 Jun 2007 18:47:32 +0400
From:	Andrey Borzenkov <arvidjaar@...l.ru>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Samuel Ortiz <samuel@...tiz.org>,
	"Linus Walleij (LD/EAB)" <linus.walleij@...csson.com>,
	linux-kernel@...r.kernel.org,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	ambx1@....rr.com, linux-pcmcia@...ts.infradead.org
Subject: Re: 2.6.22-rc: regression: no irda0 interface (2.6.21 was OK), smsc does not find chip

On Saturday 30 June 2007, Bjorn Helgaas wrote:
> This means that the SMCf010 device *did* respond, I think at the
> FIR address 0x100.  (I can't figure out the "right" way to print
> those resource_size_t things, so I added some casts in the appended
> patch.)
>

Those can be 64 bit if CONFIG_RESOURCE_64BIT is set; so you probably should 
cast to unsigned long long and use %llx. Or do it conditionally depending on 
above macro.

> Well, the whole problem I'm trying to fix is that we aren't doing
> resource allocation correctly.  The BIOS has configured the IR
> device to use port 0x100, and then something else came along and
> decided to also use port 0x100.
>

That I already asked - how should PCMCIA subsystem know that some device 
requires fixed io port? Or for that matter - how should PnP know that some 
resource it believes is free is actually used by PCMCIA?

> It looks like the something else is the wlags49_h1_cs driver for
> the PCMCIA card you have inserted.  Can you temporarily remove that
> card and driver and try the patch below?  If the IR device works
> without the wlags49_h1_cs driver, then we'll have to look at
> wlags49_h1_cs to see whether it's doing something wrong.
>


Yes, this works. I did not use patch below, because it works with original too 
of course. In this PCMCIA later sees that port range at 0x100 is already 
taken and selects another one:

[  693.694389] SMsC IrDA Controller found
[  693.694395]  IrCC version 2.0, firport 0x100, sirport 0x2e8 dma=1, irq=5
[  693.735620] No transceiver found. Defaulting to Fast pin select
[  693.757188] IrDA: Registered device irda0
[  840.397539] Yenta: CardBus bridge found at 0000:00:10.0 [12a3:ab01]
[  840.419345] Yenta: Using CSCINT to route CSC interrupts to PCI
[  840.441395] Yenta: Routing CardBus interrupts to PCI
[  840.463454] Yenta TI: socket 0000:00:10.0, mfunc 0x01000002, devctl 0x60
[  840.713821] Yenta: ISA IRQ mask 0x0000, PCI irq 11
[  840.736937] Socket status: 30000059
[  840.761016] Yenta: CardBus bridge found at 0000:00:11.0 [1179:0001]
[  840.910480] Yenta: ISA IRQ mask 0x04b8, PCI irq 11
[  840.934571] Socket status: 30000087
[  840.959527] Yenta: CardBus bridge found at 0000:00:11.1 [1179:0001]
[  841.110433] Yenta: ISA IRQ mask 0x04b8, PCI irq 11
[  841.135628] Socket status: 30000087
[  841.393023] pccard: PCMCIA card inserted into slot 0
[  970.189560] wlags49_h1_cs v7.18 for PCMCIA, 03/31/2004 14:31:00 by Agere 
Systems, http://www.agere.com
[  970.212434] *** Modified for kernel 2.6 by Andrey Borzenkov 
<arvidjaar@...l.ru> $Revision: 39 $
[  970.235874] *** Station Mode (STA) Support: YES
[  970.259328] *** Access Point Mode (AP) Support: YES
[ 1286.581694] cs: memory probe 0x0c0000-0x0fffff: excluding 0xc0000-0xcbfff 
0xe0000-0xfffff
[ 1286.608294] cs: memory probe 0x60000000-0x60ffffff: clean.
[ 1286.642101] cs: memory probe 0xa0000000-0xa0ffffff: clean.
[ 1286.676160] pcmcia: registering new device pcmcia0.0
[ 1287.186722] eth0: PRI 31 variant 2 version 9.48
[ 1287.208487] eth0: NIC 5 variant 2 version 1.02
[ 1287.234616] eth0: Wireless, io_addr 0x180, irq 11, mac_address 
00:02:2D:26:95:6C

is it interesting to look at ports:

0100-0107 : smsc-ircc2
0170-0177 : 0000:00:04.0
  0170-0177 : libata
0180-01bf : pcmcia_socket0

notice that pcmcia_socket available resources do not change at all in this 
case and still list port range 100 - 3af.

I do not think wlags driver has anything to do with it (directly). It just 
requests resource allocation from PCMCIA core. So either we have to mark 
resources of PnP devices reserved (even if devices are not active and no 
driver is loaded) or we need some way to force PnP to allocate different 
resources on device activation. Which means PCMCIA should somehow inform PnP 
that resources it allocated are in use. 

Anyway if you want to get a look - driver is available at 
http://arvidjaar.newmail.ru/wlags49.tar.bz2. 

-andrey

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