[ath9k-devel] [PATCHv2] ath9k_hw: Handle AR_INTR_SYNC_HOST1_FATAL on AR9003

[Sven Eckelmann <sven@narfation.org>]

On Wednesday 03 October 2012 07:51:28 Adrian Chadd wrote:
> On 2 October 2012 08:20, Felix Fietkau <nbd@openwrt.org> wrote:
> >> This sync cause 0x20 isn't handled anywhere and may be the cause of the
> >> hang/crash. At least this is the symptom which can be fixed without
> >> crashing the system.
> > 
> > I checked the AR933x datasheet, and it says that cause 0x20 is tx
> > descriptor corruption.
> 
> Ah hey, for Hornet they redefined those bits:
> 
> 5: MAC_TXC_CORRUPTION_FLAG_SYNC (TX descriptor integrity flag)
> 6: INVALID_ADDRESS_ACCESS (invalid register access)
> 
> Good catch. That's definitely something in the right direction.

Ok, I've just created a dirty hack to trace some of the register reads/writes. 

I used following test setup: Two Hornets, one is the "internet gateway" (just 
attached using ethernet to a test server) and is running one AP vif with 
standard OpenWRT settings. The other Hornet is placed next to it (only some 
centimeter far away) and is connected to the AP using WiFi.

The client device is just trying to download a large file using HTTP. The 
serial consoles on both devices will now print the "same" log. I already 
searched for the interesting section. It is started in ath_ani_calibrate and 
contains ~42 register access operations.

My best guess is the REG_RMW_FIELD for ATH9K_ANI_MRC_CCK in 
ar9003_hw_ani_control (just checked sync_cause before and after the access).

So, now I need some input again from the guis with the spec. :)

Kind regards,
	Sven
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