From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-wg0-f52.google.com ([74.125.82.52]:35959 "EHLO mail-wg0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755586AbaDMTVT (ORCPT ); Sun, 13 Apr 2014 15:21:19 -0400 Received: by mail-wg0-f52.google.com with SMTP id k14so7390302wgh.35 for ; Sun, 13 Apr 2014 12:21:18 -0700 (PDT) From: Emmanuel Grumbach To: linux-wireless@vger.kernel.org Cc: Emmanuel Grumbach Subject: [PATCH 47/47] iwlwifi: don't disable SCD chain extension on newer devices Date: Sun, 13 Apr 2014 22:20:02 +0300 Message-Id: <1397416802-32403-47-git-send-email-egrumbach@gmail.com> (sfid-20140413_213516_215630_042C8B68) In-Reply-To: <534AE330.2020805@gmail.com> References: <534AE330.2020805@gmail.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Emmanuel Grumbach 7000 device series have a fix for this hardware feature. Stop disabling it, and get an improvement in Tx throughput. This feature allows the scheduler to fetch more frames on the fly while an A-MPDU is being built - which means that we can get larger A-MPDU. This, of course, give an improvement in the Tx throughput. Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/iwl-1000.c | 1 + drivers/net/wireless/iwlwifi/iwl-2000.c | 2 ++ drivers/net/wireless/iwlwifi/iwl-5000.c | 1 + drivers/net/wireless/iwlwifi/iwl-6000.c | 3 +++ drivers/net/wireless/iwlwifi/iwl-config.h | 2 ++ drivers/net/wireless/iwlwifi/pcie/tx.c | 3 ++- 6 files changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/iwlwifi/iwl-1000.c b/drivers/net/wireless/iwlwifi/iwl-1000.c index 854ba84..c3817fa 100644 --- a/drivers/net/wireless/iwlwifi/iwl-1000.c +++ b/drivers/net/wireless/iwlwifi/iwl-1000.c @@ -62,6 +62,7 @@ static const struct iwl_base_params iwl1000_base_params = { .led_compensation = 51, .wd_timeout = IWL_WATCHDOG_DISABLED, .max_event_log_size = 128, + .scd_chain_ext_wa = true, }; static const struct iwl_ht_params iwl1000_ht_params = { diff --git a/drivers/net/wireless/iwlwifi/iwl-2000.c b/drivers/net/wireless/iwlwifi/iwl-2000.c index 3e63323..21e5d08 100644 --- a/drivers/net/wireless/iwlwifi/iwl-2000.c +++ b/drivers/net/wireless/iwlwifi/iwl-2000.c @@ -75,6 +75,7 @@ static const struct iwl_base_params iwl2000_base_params = { .wd_timeout = IWL_DEF_WD_TIMEOUT, .max_event_log_size = 512, .shadow_reg_enable = false, /* TODO: fix bugs using this feature */ + .scd_chain_ext_wa = true, }; @@ -88,6 +89,7 @@ static const struct iwl_base_params iwl2030_base_params = { .wd_timeout = IWL_LONG_WD_TIMEOUT, .max_event_log_size = 512, .shadow_reg_enable = false, /* TODO: fix bugs using this feature */ + .scd_chain_ext_wa = true, }; static const struct iwl_ht_params iwl2000_ht_params = { diff --git a/drivers/net/wireless/iwlwifi/iwl-5000.c b/drivers/net/wireless/iwlwifi/iwl-5000.c index 6674f2c..332bbede 100644 --- a/drivers/net/wireless/iwlwifi/iwl-5000.c +++ b/drivers/net/wireless/iwlwifi/iwl-5000.c @@ -61,6 +61,7 @@ static const struct iwl_base_params iwl5000_base_params = { .led_compensation = 51, .wd_timeout = IWL_WATCHDOG_DISABLED, .max_event_log_size = 512, + .scd_chain_ext_wa = true, }; static const struct iwl_ht_params iwl5000_ht_params = { diff --git a/drivers/net/wireless/iwlwifi/iwl-6000.c b/drivers/net/wireless/iwlwifi/iwl-6000.c index 8048de9..8f2c3c8 100644 --- a/drivers/net/wireless/iwlwifi/iwl-6000.c +++ b/drivers/net/wireless/iwlwifi/iwl-6000.c @@ -85,6 +85,7 @@ static const struct iwl_base_params iwl6000_base_params = { .wd_timeout = IWL_DEF_WD_TIMEOUT, .max_event_log_size = 512, .shadow_reg_enable = false, /* TODO: fix bugs using this feature */ + .scd_chain_ext_wa = true, }; static const struct iwl_base_params iwl6050_base_params = { @@ -97,6 +98,7 @@ static const struct iwl_base_params iwl6050_base_params = { .wd_timeout = IWL_DEF_WD_TIMEOUT, .max_event_log_size = 1024, .shadow_reg_enable = false, /* TODO: fix bugs using this feature */ + .scd_chain_ext_wa = true, }; static const struct iwl_base_params iwl6000_g2_base_params = { @@ -109,6 +111,7 @@ static const struct iwl_base_params iwl6000_g2_base_params = { .wd_timeout = IWL_LONG_WD_TIMEOUT, .max_event_log_size = 512, .shadow_reg_enable = false, /* TODO: fix bugs using this feature */ + .scd_chain_ext_wa = true, }; static const struct iwl_ht_params iwl6000_ht_params = { diff --git a/drivers/net/wireless/iwlwifi/iwl-config.h b/drivers/net/wireless/iwlwifi/iwl-config.h index 8c16730..7ce82d9 100644 --- a/drivers/net/wireless/iwlwifi/iwl-config.h +++ b/drivers/net/wireless/iwlwifi/iwl-config.h @@ -148,6 +148,7 @@ static inline u8 num_of_ant(u8 mask) * @shadow_reg_enable: HW shadow register support * @apmg_wake_up_wa: should the MAC access REQ be asserted when a command * is in flight. This is due to a HW bug in 7260, 3160 and 7265. + * @scd_chain_ext_wa: should the chain extension feature in SCD be disabled. */ struct iwl_base_params { int eeprom_size; @@ -163,6 +164,7 @@ struct iwl_base_params { const bool shadow_reg_enable; const bool pcie_l1_allowed; const bool apmg_wake_up_wa; + const bool scd_chain_ext_wa; }; /* diff --git a/drivers/net/wireless/iwlwifi/pcie/tx.c b/drivers/net/wireless/iwlwifi/pcie/tx.c index 78a6ff2..dde6031 100644 --- a/drivers/net/wireless/iwlwifi/pcie/tx.c +++ b/drivers/net/wireless/iwlwifi/pcie/tx.c @@ -696,7 +696,8 @@ void iwl_pcie_tx_start(struct iwl_trans *trans, u32 scd_base_addr) /* The chain extension of the SCD doesn't work well. This feature is * enabled by default by the HW, so we need to disable it manually. */ - iwl_write_prph(trans, SCD_CHAINEXT_EN, 0); + if (trans->cfg->base_params->scd_chain_ext_wa) + iwl_write_prph(trans, SCD_CHAINEXT_EN, 0); iwl_trans_ac_txq_enable(trans, trans_pcie->cmd_queue, trans_pcie->cmd_fifo); -- 1.8.3.2