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iwlwifi: disable the buggy chain extension feature in HW
This feature has been reported to be buggy and enabled by default. We therefore need to disable it manually. Cc: stable@vger.kernel.org Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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@ -224,6 +224,7 @@
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#define SCD_TXFACT (SCD_BASE + 0x10)
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#define SCD_ACTIVE (SCD_BASE + 0x14)
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#define SCD_QUEUECHAIN_SEL (SCD_BASE + 0xe8)
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#define SCD_CHAINEXT_EN (SCD_BASE + 0x244)
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#define SCD_AGGR_SEL (SCD_BASE + 0x248)
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#define SCD_INTERRUPT_MASK (SCD_BASE + 0x108)
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@ -1058,6 +1058,11 @@ static void iwl_tx_start(struct iwl_trans *trans)
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iwl_write_prph(trans, SCD_DRAM_BASE_ADDR,
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trans_pcie->scd_bc_tbls.dma >> 10);
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/* The chain extension of the SCD doesn't work well. This feature is
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* enabled by default by the HW, so we need to disable it manually.
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*/
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iwl_write_prph(trans, SCD_CHAINEXT_EN, 0);
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/* Enable DMA channel */
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for (chan = 0; chan < FH_TCSR_CHNL_NUM ; chan++)
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iwl_write_direct32(trans, FH_TCSR_CHNL_TX_CONFIG_REG(chan),
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