On 2012-10-05 1:08 PM, Sven Eckelmann wrote: > On Wednesday 03 October 2012 07:51:28 Adrian Chadd wrote: >> On 2 October 2012 08:20, Felix Fietkau <n...@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. :) Actually, this makes a lot of sense. Maximal Ratio Combining can only be done if you have multiple inputs, and Hornet is a single-chain device ;)
Please try this patch to see if it gets rid of these interrupts: --- --- a/drivers/net/wireless/ath/ath9k/ani.c +++ b/drivers/net/wireless/ath/ath9k/ani.c @@ -307,7 +307,8 @@ void ath9k_ani_reset(struct ath_hw *ah, if (IS_CHAN_2GHZ(chan)) { ah->ani_function = (ATH9K_ANI_SPUR_IMMUNITY_LEVEL | ATH9K_ANI_FIRSTEP_LEVEL); - if (AR_SREV_9300_20_OR_LATER(ah)) + if (AR_SREV_9300_20_OR_LATER(ah) && + ah->caps.rx_chainmask != 1) ah->ani_function |= ATH9K_ANI_MRC_CCK; } else ah->ani_function = 0; _______________________________________________ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel