[PATCH 3.10 20/70] iwlwifi: configure the LTR

From: Greg Kroah-Hartman
Date: Wed Nov 19 2014 - 16:33:01 EST

3.10-stable review patch. If anyone has any objections, please let me know.

------------------

From: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>

commit 9180ac50716a097a407c6d7e7e4589754a922260 upstream.

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.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>


---
drivers/net/wireless/iwlwifi/iwl-trans.h | 2 +
drivers/net/wireless/iwlwifi/mvm/fw-api-power.h | 35 +++++++++++++++++++++++-
drivers/net/wireless/iwlwifi/mvm/fw-api.h | 1
drivers/net/wireless/iwlwifi/mvm/fw.c | 9 ++++++
drivers/net/wireless/iwlwifi/mvm/ops.c | 1
drivers/net/wireless/iwlwifi/pcie/trans.c | 17 ++++++-----
6 files changed, 57 insertions(+), 8 deletions(-)

--- a/drivers/net/wireless/iwlwifi/iwl-trans.h
+++ b/drivers/net/wireless/iwlwifi/iwl-trans.h
@@ -489,6 +489,7 @@ 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
@@ -513,6 +514,7 @@ 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;
--- a/drivers/net/wireless/iwlwifi/mvm/fw-api-power.h
+++ b/drivers/net/wireless/iwlwifi/mvm/fw-api-power.h
@@ -67,7 +67,40 @@
/* Power Management Commands, Responses, Notifications */

/**
- * enum iwl_scan_flags - masks for power table command flags
+ * 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;
+
+/**
+ * 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,
--- a/drivers/net/wireless/iwlwifi/mvm/fw-api.h
+++ b/drivers/net/wireless/iwlwifi/mvm/fw-api.h
@@ -138,6 +138,7 @@ enum {

/* Power */
POWER_TABLE_CMD = 0x77,
+ LTR_CONFIG = 0xee,

/* Scanning */
SCAN_REQUEST_CMD = 0x80,
--- a/drivers/net/wireless/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/iwlwifi/mvm/fw.c
@@ -443,6 +443,15 @@ int iwl_mvm_up(struct iwl_mvm *mvm)
if (ret)
goto error;

+ 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));
+ }
+
IWL_DEBUG_INFO(mvm, "RT uCode started.\n");

return 0;
--- a/drivers/net/wireless/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/iwlwifi/mvm/ops.c
@@ -293,6 +293,7 @@ static const char *iwl_mvm_cmd_strings[R
CMD(BT_PROFILE_NOTIFICATION),
CMD(BT_CONFIG),
CMD(MCAST_FILTER_CMD),
+ CMD(LTR_CONFIG),
};
#undef CMD

--- a/drivers/net/wireless/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/iwlwifi/pcie/trans.c
@@ -116,11 +116,13 @@ static void iwl_pcie_set_pwr(struct iwl_

/* PCI registers */
#define PCI_CFG_RETRY_TIMEOUT 0x041
+#define PCI_EXP_DEVCTL2_LTR_EN 0x0400

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.
@@ -131,16 +133,17 @@ static void iwl_pcie_apm_config(struct i
* 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");
}

/*


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