This is a note to let you know that I've just added the patch titled
iwlwifi: disable the buggy chain extension feature in HW
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iwlwifi-disable-the-buggy-chain-extension-feature-in-hw.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From d012d04e4d6312ea157b6cf19e9689af934f5aa7 Mon Sep 17 00:00:00 2001
From: Emmanuel Grumbach <[email protected]>
Date: Wed, 6 Jun 2012 13:55:02 +0200
Subject: iwlwifi: disable the buggy chain extension feature in HW
From: Emmanuel Grumbach <[email protected]>
commit d012d04e4d6312ea157b6cf19e9689af934f5aa7 upstream.
This feature has been reported to be buggy and enabled by
default. We therefore need to disable it manually.
Signed-off-by: Emmanuel Grumbach <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>
Signed-off-by: John W. Linville <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/wireless/iwlwifi/iwl-prph.h | 1 +
drivers/net/wireless/iwlwifi/iwl-trans-pcie.c | 5 +++++
2 files changed, 6 insertions(+)
--- a/drivers/net/wireless/iwlwifi/iwl-prph.h
+++ b/drivers/net/wireless/iwlwifi/iwl-prph.h
@@ -224,6 +224,7 @@
#define SCD_TXFACT (SCD_BASE + 0x10)
#define SCD_ACTIVE (SCD_BASE + 0x14)
#define SCD_QUEUECHAIN_SEL (SCD_BASE + 0xe8)
+#define SCD_CHAINEXT_EN (SCD_BASE + 0x244)
#define SCD_AGGR_SEL (SCD_BASE + 0x248)
#define SCD_INTERRUPT_MASK (SCD_BASE + 0x108)
--- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
+++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
@@ -1128,6 +1128,11 @@ static void iwl_tx_start(struct iwl_tran
iwl_write_prph(trans, SCD_DRAM_BASE_ADDR,
trans_pcie->scd_bc_tbls.dma >> 10);
+ /* The chain extension of the SCD doesn't work well. This feature is
+ * enabled by default by the HW, so we need to disable it manually.
+ */
+ iwl_write_prph(trans, SCD_CHAINEXT_EN, 0);
+
/* Enable DMA channel */
for (chan = 0; chan < FH_TCSR_CHNL_NUM ; chan++)
iwl_write_direct32(trans, FH_TCSR_CHNL_TX_CONFIG_REG(chan),
Patches currently in stable-queue which might be from
[email protected] are
queue-3.4/iwlwifi-don-t-mess-up-the-scd-when-removing-a-key.patch
queue-3.4/mac80211-fix-error-in-station-state-transitions-during-reconfig.patch
queue-3.4/iwlwifi-disable-the-buggy-chain-extension-feature-in-hw.patch
queue-3.4/iwlwifi-use-correct-supported-firmware-for-6035-and-6000g2.patch
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