Commit 0f851bbc authored Mar 16, 2016 by Sara Sharon Committed by Emmanuel Grumbach Mar 30, 2016

iwlwifi: pcie: write to legacy register also in MQ



Due to hardware bug, upon any shadow free-queue register write
access, a legacy RBD shadow register must be written as well.
This is required in order to trigger a copy of the shadow registers
values after MAC exits sleep state.
Specifically, the driver has to write (any value) to the legacy RBD
register each time FRBDCB is accessed.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

parent 24afba76

drivers/net/wireless/intel/iwlwifi/pcie/rx.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -210,7 +210,11 @@ static void iwl_pcie_rxq_inc_wr_ptr(struct iwl_trans *trans,
		if (trans->cfg->mq_rx_supported)
		iwl_write_prph(trans, RFH_Q_FRBDCB_WIDX(rxq->id),
		rxq->write_actual);
		else
		/*
		* write to FH_RSCSR_CHNL0_WPTR register even in MQ as a W/A to
		* hardware shadow registers bug - writing to RFH_Q_FRBDCB_WIDX will
		* not wake the NIC.
		*/
		iwl_write32(trans, FH_RSCSR_CHNL0_WPTR, rxq->write_actual);
		}