iwlwifi: pcie: don't disable the busmaster DMA clock for family 8000

Disabling the clocks is a standard procedure while stopping the
device. On family 8000 however, disabling the bus master DMA clock
increases the NIC's power consumption.

To fix this, skip this call if the device family is
IWL_DEVICE_FAMILY_8000.

Signed-off-by: Avri Altman <avri.altman@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c
index 47bbf573fdc8..d6f6515fe663 100644
--- a/drivers/net/wireless/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/iwlwifi/pcie/trans.c
@@ -1049,9 +1049,11 @@ static void iwl_trans_pcie_stop_device(struct iwl_trans *trans, bool low_power)
                 iwl_pcie_rx_stop(trans);
 
                 /* Power-down device's busmaster DMA clocks */
-                iwl_write_prph(trans, APMG_CLK_DIS_REG,
-                               APMG_CLK_VAL_DMA_CLK_RQT);
-                udelay(5);
+                if (trans->cfg->device_family != IWL_DEVICE_FAMILY_8000) {
+                        iwl_write_prph(trans, APMG_CLK_DIS_REG,
+                                       APMG_CLK_VAL_DMA_CLK_RQT);
+                        udelay(5);
+                }
         }
 
         /* Make sure (redundant) we've released our request to stay awake */