From: Sara Sharon <sara.sharon@xxxxxxxxx> 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@xxxxxxxxx> Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx> --- drivers/net/wireless/intel/iwlwifi/pcie/rx.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c index e379dba..59a7e45 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c @@ -210,8 +210,12 @@ 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 - iwl_write32(trans, FH_RSCSR_CHNL0_WPTR, rxq->write_actual); + /* + * 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); } static void iwl_pcie_rxq_check_wrptr(struct iwl_trans *trans) -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
