netdev - Re: brcm80211 breakage..

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Date:	Wed, 11 Jan 2012 22:15:19 -0600
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Arend van Spriel <arend@...adcom.com>,
	"John W. Linville" <linville@...driver.com>,
	Network Development <netdev@...r.kernel.org>,
	"Franky (Zhenhui) Lin" <frankyl@...adcom.com>,
	Rafał Miłecki <zajec5@...il.com>
Subject: Re: brcm80211 breakage..

On 01/11/2012 08:11 PM, Linus Torvalds wrote:
> On Wed, Jan 11, 2012 at 5:46 PM, Larry Finger<Larry.Finger@...inger.net>  wrote:
>>
>> OK. The SPROM issue is not completely irrelevant as that has to be correct,
>> but obviously not sufficient.
>
> Hmm. Having dug a bit deeper, I do think it's kind of related.
>
> I get -ENODATA form sprom_read_pci(), but that function actually seems
> to get the offset *right*.
>
> Some printout shows that for that chip, I have
>
>   - ai_get_ccrev(sih) = 34
>   - sprom_offset = 0x800
>
> but then it apparently reads all ones anyway. At least in the first
> word. So then I get that -ENODATA error.
>
> So once more, it's somehow related to the sprom, just in a new place:
> sprom_read_pci() in brcmsmac/srom.c instead of drivers/bcma/sprom.c.
>
> Does that give people any new ideas to try out?

Things are getting curious. I have a 14e4:4353 device, which works with both b43 
and brcmsmac using mainline v3.2-6271-g925b5d2. The output of

dmesg | egrep "bcma|brcm"

with some extra debugging added yields:

bcma-pci-bridge 0000:06:00.0: PCI INT A -> Link[LK1E] -> GSI 22 (level, low) -> 
IRQ 22
bcma-pci-bridge 0000:06:00.0: setting latency timer to 64
bcma: Core 0 found: ChipCommon (manuf 0x4BF, id 0x800, rev 0x22, class 0x0)
bcma: Core 1 found: IEEE 802.11 (manuf 0x4BF, id 0x812, rev 0x17, class 0x0)
bcma: Core 2 found: PCIe (manuf 0x4BF, id 0x820, rev 0x0F, class 0x0)
bcma: Found rev 6 PMU (capabilities 0x108C2606)
bcma: SPROM offset 0x830
bcma: Found SPROM Revision 8
bcma: Bus registered
brcmsmac bcma0:0: mfg 4bf core 812 rev 23 class 0 irq 22
brcmsmac: Found chip type AI (0x1381a8d8)
brcmsmac: Applying 43224B0+ WARs
bcma: Switched to core: 0x812
brcms_module_init: register returned 0

I see no difference in the core revisions, etc. to explain why mine should work, 
and yours fail.

Arend: Any particular place we should look?

Larry

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