From: Sara Sharon <sara.sha...@intel.com>
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.sha...@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumb...@intel.com>
---
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
--
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