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iwlwifi: configure the LTR 

The LTR is the handshake between the device and the root
complex about the latency allowed when the bus exits power
save. This configuration was missing and this led to high
latency in the link power up. The end user could experience
high latency in the network because of this.

Cc: <stable@vger.kernel.org> [3.10+]
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Emmanuel Grumbach 2014-09-23 23:02:41 +03:00
parent 35a9ad8af0
commit 9180ac5071
6 changed files with 56 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wireless/iwlwifi/iwl-trans.h
View File

@ -563,6 +563,7 @@ enum iwl_trans_state {
* Set during transport allocation.
* @hw_id_str: a string with info about HW ID. Set during transport allocation.
* @pm_support: set to true in start_hw if link pm is supported
* @ltr_enabled: set to true if the LTR is enabled
* @dev_cmd_pool: pool for Tx cmd allocation - for internal use only.
* The user should use iwl_trans_{alloc,free}_tx_cmd.
* @dev_cmd_headroom: room needed for the transport's private use before the
@ -589,6 +590,7 @@ struct iwl_trans {
u8 rx_mpdu_cmd, rx_mpdu_cmd_hdr_size;
bool pm_support;
bool ltr_enabled;
/* The following fields are internal only */
struct kmem_cache *dev_cmd_pool;

35
drivers/net/wireless/iwlwifi/mvm/fw-api-power.h
View File

@ -68,13 +68,46 @@
/* Power Management Commands, Responses, Notifications */
/**
* enum iwl_ltr_config_flags - masks for LTR config command flags
* @LTR_CFG_FLAG_FEATURE_ENABLE: Feature operational status
* @LTR_CFG_FLAG_HW_DIS_ON_SHADOW_REG_ACCESS: allow LTR change on shadow
* memory access
* @LTR_CFG_FLAG_HW_EN_SHRT_WR_THROUGH: allow LTR msg send on ANY LTR
* reg change
* @LTR_CFG_FLAG_HW_DIS_ON_D0_2_D3: allow LTR msg send on transition from
* D0 to D3
* @LTR_CFG_FLAG_SW_SET_SHORT: fixed static short LTR register
* @LTR_CFG_FLAG_SW_SET_LONG: fixed static short LONG register
* @LTR_CFG_FLAG_DENIE_C10_ON_PD: allow going into C10 on PD
*/
enum iwl_ltr_config_flags {
LTR_CFG_FLAG_FEATURE_ENABLE = BIT(0),
LTR_CFG_FLAG_HW_DIS_ON_SHADOW_REG_ACCESS = BIT(1),
LTR_CFG_FLAG_HW_EN_SHRT_WR_THROUGH = BIT(2),
LTR_CFG_FLAG_HW_DIS_ON_D0_2_D3 = BIT(3),
LTR_CFG_FLAG_SW_SET_SHORT = BIT(4),
LTR_CFG_FLAG_SW_SET_LONG = BIT(5),
LTR_CFG_FLAG_DENIE_C10_ON_PD = BIT(6),
};
/**
* struct iwl_ltr_config_cmd - configures the LTR
* @flags: See %enum iwl_ltr_config_flags
*/
struct iwl_ltr_config_cmd {
__le32 flags;
__le32 static_long;
__le32 static_short;
} __packed;
/* Radio LP RX Energy Threshold measured in dBm */
#define POWER_LPRX_RSSI_THRESHOLD 75
#define POWER_LPRX_RSSI_THRESHOLD_MAX 94
#define POWER_LPRX_RSSI_THRESHOLD_MIN 30
/**
* enum iwl_scan_flags - masks for power table command flags
* enum iwl_power_flags - masks for power table command flags
* @POWER_FLAGS_POWER_SAVE_ENA_MSK: '1' Allow to save power by turning off
* receiver and transmitter. '0' - does not allow.
* @POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK: '0' Driver disables power management,

1
drivers/net/wireless/iwlwifi/mvm/fw-api.h
View File

@ -157,6 +157,7 @@ enum {
/* Power - legacy power table command */
POWER_TABLE_CMD = 0x77,
PSM_UAPSD_AP_MISBEHAVING_NOTIFICATION = 0x78,
LTR_CONFIG = 0xee,
/* Thermal Throttling*/
REPLY_THERMAL_MNG_BACKOFF = 0x7e,

9
drivers/net/wireless/iwlwifi/mvm/fw.c
View File

@ -480,6 +480,15 @@ int iwl_mvm_up(struct iwl_mvm *mvm)
/* Initialize tx backoffs to the minimal possible */
iwl_mvm_tt_tx_backoff(mvm, 0);
if (mvm->trans->ltr_enabled) {
struct iwl_ltr_config_cmd cmd = {
.flags = cpu_to_le32(LTR_CFG_FLAG_FEATURE_ENABLE),
};
WARN_ON(iwl_mvm_send_cmd_pdu(mvm, LTR_CONFIG, 0,
sizeof(cmd), &cmd));
}
ret = iwl_mvm_power_update_device(mvm);
if (ret)
goto error;

1
drivers/net/wireless/iwlwifi/mvm/ops.c
View File

@ -336,6 +336,7 @@ static const char *const iwl_mvm_cmd_strings[REPLY_MAX] = {
CMD(DTS_MEASUREMENT_NOTIFICATION),
CMD(REPLY_THERMAL_MNG_BACKOFF),
CMD(MAC_PM_POWER_TABLE),
CMD(LTR_CONFIG),
CMD(BT_COEX_CI),
CMD(BT_COEX_UPDATE_SW_BOOST),
CMD(BT_COEX_UPDATE_CORUN_LUT),

16
drivers/net/wireless/iwlwifi/pcie/trans.c
View File

@ -174,6 +174,7 @@ static void iwl_pcie_apm_config(struct iwl_trans *trans)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
u16 lctl;
u16 cap;
/*
* HW bug W/A for instability in PCIe bus L0S->L1 transition.
@ -184,16 +185,17 @@ static void iwl_pcie_apm_config(struct iwl_trans *trans)
* power savings, even without L1.
*/
pcie_capability_read_word(trans_pcie->pci_dev, PCI_EXP_LNKCTL, &lctl);
if (lctl & PCI_EXP_LNKCTL_ASPM_L1) {
/* L1-ASPM enabled; disable(!) L0S */
if (lctl & PCI_EXP_LNKCTL_ASPM_L1)
iwl_set_bit(trans, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_ENABLED);
dev_info(trans->dev, "L1 Enabled; Disabling L0S\n");
} else {
/* L1-ASPM disabled; enable(!) L0S */
else
iwl_clear_bit(trans, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_ENABLED);
dev_info(trans->dev, "L1 Disabled; Enabling L0S\n");
}
trans->pm_support = !(lctl & PCI_EXP_LNKCTL_ASPM_L0S);
pcie_capability_read_word(trans_pcie->pci_dev, PCI_EXP_DEVCTL2, &cap);
trans->ltr_enabled = cap & PCI_EXP_DEVCTL2_LTR_EN;
dev_info(trans->dev, "L1 %sabled - LTR %sabled\n",
(lctl & PCI_EXP_LNKCTL_ASPM_L1) ? "En" : "Dis",
trans->ltr_enabled ? "En" : "Dis");
}
/*