iwlwifi: pcie: configure more RFH settings

Fine tune RFH registers further:
* Set default queue explicitly
* Set RFH to drop frames exceeding RB size
* Set the maximum rx transfer size to DRAM to 128 instead of 64

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

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-fh.h b/drivers/net/wireless/intel/iwlwifi/iwl-fh.h
index 4ab6682..8af818b 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/iwl-fh.h
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-fh.h
@@ -6,7 +6,7 @@
  * GPL LICENSE SUMMARY
  *
  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
- * Copyright(c) 2015 Intel Deutschland GmbH
+ * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -32,7 +32,7 @@
  * BSD LICENSE
  *
  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
- * Copyright(c) 2015 Intel Deutschland GmbH
+ * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -368,20 +368,24 @@ static inline unsigned int FH_MEM_CBBC_QUEUE(unsigned int chnl)
 #define RFH_RXF_DMA_RBDCB_SIZE_512     (0x9 << RFH_RXF_DMA_RBDCB_SIZE_POS)
 #define RFH_RXF_DMA_RBDCB_SIZE_1024    (0xA << RFH_RXF_DMA_RBDCB_SIZE_POS)
 #define RFH_RXF_DMA_RBDCB_SIZE_2048    (0xB << RFH_RXF_DMA_RBDCB_SIZE_POS)
-#define RFH_RXF_DMA_MIN_RB_SIZE_MASK (0x03000000) /* bit 24-25 */
+#define RFH_RXF_DMA_MIN_RB_SIZE_MASK   (0x03000000) /* bit 24-25 */
 #define RFH_RXF_DMA_MIN_RB_SIZE_POS    24
-#define RFH_RXF_DMA_MIN_RB_4_8 (3 << RFH_RXF_DMA_MIN_RB_SIZE_POS)
-#define RFH_RXF_DMA_SINGLE_FRAME_MASK (0x20000000) /* bit 29 */
-#define RFH_DMA_EN_MASK (0xC0000000) /* bits 30-31*/
-#define RFH_DMA_EN_ENABLE_VAL BIT(31)
+#define RFH_RXF_DMA_MIN_RB_4_8         (3 << RFH_RXF_DMA_MIN_RB_SIZE_POS)
+#define RFH_RXF_DMA_DROP_TOO_LARGE_MASK        (0x04000000) /* bit 26 */
+#define RFH_RXF_DMA_SINGLE_FRAME_MASK  (0x20000000) /* bit 29 */
+#define RFH_DMA_EN_MASK                        (0xC0000000) /* bits 30-31*/
+#define RFH_DMA_EN_ENABLE_VAL          BIT(31)
 
 #define RFH_RXF_RXQ_ACTIVE 0xA0980C
 
 #define RFH_GEN_CFG    0xA09800
+#define RFH_GEN_CFG_SERVICE_DMA_SNOOP  BIT(0)
+#define RFH_GEN_CFG_RFH_DMA_SNOOP      BIT(1)
+#define RFH_GEN_CFG_RB_CHUNK_SIZE      BIT(4) /* 0 - 64B, 1- 128B */
 #define RFH_GEN_CFG_DEFAULT_RXQ_NUM_MASK 0xF00
-#define RFH_GEN_CFG_SERVICE_DMA_SNOOP BIT(0)
-#define RFH_GEN_CFG_RFH_DMA_SNOOP BIT(1)
-#define DEFAULT_RXQ_NUM 8
+#define RFH_GEN_CFG_DEFAULT_RXQ_NUM_POS 8
+
+#define DEFAULT_RXQ_NUM                        0
 
 /* end of 9000 rx series registers */
 

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
index c0db681..398dd93 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
@@ -783,16 +783,26 @@ static void iwl_pcie_rx_mq_hw_init(struct iwl_trans *trans)
         * Single frame mode
         * Rx buffer size 4 or 8k or 12k
         * Min RB size 4 or 8
+        * Drop frames that exceed RB size
         * 512 RBDs
         */
        iwl_write_prph(trans, RFH_RXF_DMA_CFG,
                       RFH_DMA_EN_ENABLE_VAL |
                       rb_size | RFH_RXF_DMA_SINGLE_FRAME_MASK |
                       RFH_RXF_DMA_MIN_RB_4_8 |
+                      RFH_RXF_DMA_DROP_TOO_LARGE_MASK |
                       RFH_RXF_DMA_RBDCB_SIZE_512);
 
+       /*
+        * Activate DMA snooping.
+        * Set RX DMA chunk size to 128 bit
+        * Default queue is 0
+        */
        iwl_write_prph(trans, RFH_GEN_CFG, RFH_GEN_CFG_RFH_DMA_SNOOP |
-                                         RFH_GEN_CFG_SERVICE_DMA_SNOOP);
+                      RFH_GEN_CFG_RB_CHUNK_SIZE |
+                      (DEFAULT_RXQ_NUM << RFH_GEN_CFG_DEFAULT_RXQ_NUM_POS) |
+                      RFH_GEN_CFG_SERVICE_DMA_SNOOP);
+       /* Enable the relevant rx queues */
        iwl_write_prph(trans, RFH_RXF_RXQ_ACTIVE, enabled);
 
        /* Set interrupt coalescing timer to default (2048 usecs) */