iwlwifi: SCD_INT_MSK is obsolete - don't update it

The scheduler can issue an interrupt when moving the read
pointer. To get this interrupt, the driver needs to
configure what queue can issue an interrupt when its read
pointer moves in the scheduler: this is the SCD_INT_MSK.
The driver also needs to enable the interrupt in
CSR_INT_MASK (bit CSR_INT_BIT_SCD).

Since we don't enable the scheduler interrupt in
CSR_INT_MASK, there is no point in requesting an interrupt
from the scheduler: it will be masked anyway. So don't
configure the scheduler to issue interrupts at all.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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

@@ -1082,9 +1082,6 @@ static void iwl_tx_start(struct iwl_trans *trans)
 				SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK));
 	}
 
-	iwl_write_prph(trans, SCD_INTERRUPT_MASK,
-		       IWL_MASK(0, trans->cfg->base_params->num_of_queues));
-
 	/* Activate all Tx DMA/FIFO channels */
 	iwl_trans_txq_set_sched(trans, IWL_MASK(0, 7));
 

drivers/net/wireless/iwlwifi/pcie/tx.c

@@ -480,8 +480,6 @@ void iwl_trans_pcie_tx_agg_setup(struct iwl_trans *trans, int txq_id, int fifo,
 			((frame_limit << SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
 				SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK));
 
-	iwl_set_bits_prph(trans, SCD_INTERRUPT_MASK, (1 << txq_id));
-
 	/* Set up Status area in SRAM, map to Tx DMA/FIFO, activate the queue */
 	iwl_trans_tx_queue_set_status(trans, &trans_pcie->txq[txq_id],
 				      fifo, true);
@@ -506,8 +504,6 @@ void iwl_trans_pcie_tx_agg_disable(struct iwl_trans *trans, int txq_id)
 	trans_pcie->txq[txq_id].q.write_ptr = 0;
 	iwl_trans_set_wr_ptrs(trans, txq_id, 0);
 
-	iwl_clear_bits_prph(trans, SCD_INTERRUPT_MASK, BIT(txq_id));
-
 	iwl_trans_tx_queue_set_status(trans, &trans_pcie->txq[txq_id],
 				      0, false);
 }