Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit d012d04e authored by Emmanuel Grumbach's avatar Emmanuel Grumbach Committed by John W. Linville
Browse files

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: default avatarEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent d6ee27eb

drivers/net/wireless/iwlwifi/iwl-prph.h

+1 −0
Original line number Diff line number Diff line
@@ -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)

drivers/net/wireless/iwlwifi/iwl-trans-pcie.c

+5 −0
Original line number Diff line number Diff line
@@ -1058,6 +1058,11 @@ static void iwl_tx_start(struct iwl_trans *trans) 
	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),