iwlwifi: pcie: fix interrupt coalescing for 7260 / 3160

We changed the timeout for the interrupt coealescing for
calibration, but that wasn't effective since we changed
that value back before loading the firmware. Since
calibrations are notification from firmware and not Rx
packets, this doesn't change anyway - the firmware will
fire an interrupt straight away regardless of the interrupt
coalescing value.
Also, a HW issue has been discovered in 7000 devices series.
The work around is to disable the new interrupt coalescing
timeout feature - do this by setting bit 31 in
CSR_INT_COALESCING.
This has been fixed in 7265 which means that we can't rely
on the device family and must have a hint in the iwl_cfg
structure.

Cc: stable@vger.kernel.org [3.10+]
Fixes: 99cd47142399 ("iwlwifi: add 7000 series device configuration")
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-7000.c b/drivers/net/wireless/iwlwifi/iwl-7000.c
index 85879dbaa402cdaa88d93247b678aaac9a3ff000..2ea4b11f838eaad9cce50df66cafde089a3d2904 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-7000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-7000.c
@@ -130,6 +130,7 @@ const struct iwl_cfg iwl7260_2ac_cfg = {
        .ht_params = &iwl7000_ht_params,
        .nvm_ver = IWL7260_NVM_VERSION,
        .nvm_calib_ver = IWL7260_TX_POWER_VERSION,
+       .host_interrupt_operation_mode = true,
 };
 
 const struct iwl_cfg iwl7260_2ac_cfg_high_temp = {
@@ -140,6 +141,7 @@ const struct iwl_cfg iwl7260_2ac_cfg_high_temp = {
        .nvm_ver = IWL7260_NVM_VERSION,
        .nvm_calib_ver = IWL7260_TX_POWER_VERSION,
        .high_temp = true,
+       .host_interrupt_operation_mode = true,
 };
 
 const struct iwl_cfg iwl7260_2n_cfg = {
@@ -149,6 +151,7 @@ const struct iwl_cfg iwl7260_2n_cfg = {
        .ht_params = &iwl7000_ht_params,
        .nvm_ver = IWL7260_NVM_VERSION,
        .nvm_calib_ver = IWL7260_TX_POWER_VERSION,
+       .host_interrupt_operation_mode = true,
 };
 
 const struct iwl_cfg iwl7260_n_cfg = {
@@ -158,6 +161,7 @@ const struct iwl_cfg iwl7260_n_cfg = {
        .ht_params = &iwl7000_ht_params,
        .nvm_ver = IWL7260_NVM_VERSION,
        .nvm_calib_ver = IWL7260_TX_POWER_VERSION,
+       .host_interrupt_operation_mode = true,
 };
 
 const struct iwl_cfg iwl3160_2ac_cfg = {
@@ -167,6 +171,7 @@ const struct iwl_cfg iwl3160_2ac_cfg = {
        .ht_params = &iwl7000_ht_params,
        .nvm_ver = IWL3160_NVM_VERSION,
        .nvm_calib_ver = IWL3160_TX_POWER_VERSION,
+       .host_interrupt_operation_mode = true,
 };
 
 const struct iwl_cfg iwl3160_2n_cfg = {
@@ -176,6 +181,7 @@ const struct iwl_cfg iwl3160_2n_cfg = {
        .ht_params = &iwl7000_ht_params,
        .nvm_ver = IWL3160_NVM_VERSION,
        .nvm_calib_ver = IWL3160_TX_POWER_VERSION,
+       .host_interrupt_operation_mode = true,
 };
 
 const struct iwl_cfg iwl3160_n_cfg = {
@@ -185,6 +191,7 @@ const struct iwl_cfg iwl3160_n_cfg = {
        .ht_params = &iwl7000_ht_params,
        .nvm_ver = IWL3160_NVM_VERSION,
        .nvm_calib_ver = IWL3160_TX_POWER_VERSION,
+       .host_interrupt_operation_mode = true,
 };
 
 const struct iwl_cfg iwl7265_2ac_cfg = {

diff --git a/drivers/net/wireless/iwlwifi/iwl-config.h b/drivers/net/wireless/iwlwifi/iwl-config.h
index 18f232e8e81253b31d730755f242b7a51552157c..6801c7a23175e68ce334efd23d425dad49b5c0ea 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-config.h
+++ b/drivers/net/wireless/iwlwifi/iwl-config.h
@@ -207,6 +207,8 @@ struct iwl_eeprom_params {
  * @rx_with_siso_diversity: 1x1 device with rx antenna diversity
  * @internal_wimax_coex: internal wifi/wimax combo device
  * @high_temp: Is this NIC is designated to be in high temperature.
+ * @host_interrupt_operation_mode: device needs host interrupt operation
+ *     mode set
  *
  * We enable the driver to be backward compatible wrt. hardware features.
  * API differences in uCode shouldn't be handled here but through TLVs
@@ -235,6 +237,7 @@ struct iwl_cfg {
        enum iwl_led_mode led_mode;
        const bool rx_with_siso_diversity;
        const bool internal_wimax_coex;
+       const bool host_interrupt_operation_mode;
        bool high_temp;
 };
 

diff --git a/drivers/net/wireless/iwlwifi/iwl-csr.h b/drivers/net/wireless/iwlwifi/iwl-csr.h
index 54a4fdc631b73c987f12e459e8245d38b18f0c0b..da4eca8b3007feabb267a1710c95a70306224455 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-csr.h
+++ b/drivers/net/wireless/iwlwifi/iwl-csr.h
@@ -495,14 +495,11 @@ enum secure_load_status_reg {
  * the CSR_INT_COALESCING is an 8 bit register in 32-usec unit
  *
  * default interrupt coalescing timer is 64 x 32 = 2048 usecs
- * default interrupt coalescing calibration timer is 16 x 32 = 512 usecs
  */
 #define IWL_HOST_INT_TIMEOUT_MAX       (0xFF)
 #define IWL_HOST_INT_TIMEOUT_DEF       (0x40)
 #define IWL_HOST_INT_TIMEOUT_MIN       (0x0)
-#define IWL_HOST_INT_CALIB_TIMEOUT_MAX (0xFF)
-#define IWL_HOST_INT_CALIB_TIMEOUT_DEF (0x10)
-#define IWL_HOST_INT_CALIB_TIMEOUT_MIN (0x0)
+#define IWL_HOST_INT_OPER_MODE         BIT(31)
 
 /*****************************************************************************
  *                        7000/3000 series SHR DTS addresses                 *

diff --git a/drivers/net/wireless/iwlwifi/pcie/rx.c b/drivers/net/wireless/iwlwifi/pcie/rx.c
index 3f237b42eb36d3c94cc84f94d0ba86b6a7861e41..83d28bcf0d48ac42463a59f5bfd81a19dd0a6a55 100644 (file)
--- a/drivers/net/wireless/iwlwifi/pcie/rx.c
+++ b/drivers/net/wireless/iwlwifi/pcie/rx.c
@@ -489,6 +489,10 @@ static void iwl_pcie_rx_hw_init(struct iwl_trans *trans, struct iwl_rxq *rxq)
 
        /* Set interrupt coalescing timer to default (2048 usecs) */
        iwl_write8(trans, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF);
+
+       /* W/A for interrupt coalescing bug in 7260 and 3160 */
+       if (trans->cfg->host_interrupt_operation_mode)
+               iwl_set_bit(trans, CSR_INT_COALESCING, IWL_HOST_INT_OPER_MODE);
 }
 
 static void iwl_pcie_rx_init_rxb_lists(struct iwl_rxq *rxq)

diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c
index 5d9337bec67a87c59f3ccef73e5f5b26644930d5..cde9c16f6e4febb26c66c2206068bdba973c708a 100644 (file)
--- a/drivers/net/wireless/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/iwlwifi/pcie/trans.c
@@ -279,9 +279,6 @@ static int iwl_pcie_nic_init(struct iwl_trans *trans)
        spin_lock_irqsave(&trans_pcie->irq_lock, flags);
        iwl_pcie_apm_init(trans);
 
-       /* Set interrupt coalescing calibration timer to default (512 usecs) */
-       iwl_write8(trans, CSR_INT_COALESCING, IWL_HOST_INT_CALIB_TIMEOUT_DEF);
-
        spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
 
        iwl_pcie_set_pwr(trans, false);