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iwlagn: invoke L0S workaround for 6000/1000 series

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Invoke workaround to avoid instability in L0->L0S->L1 transition on PCIe bus.
Workaround disables L0S state so device moves directly from L0->L1.
Workaround needed on all devices since and including 4965; add to 6000/1000.

Describe bug and workaround better in comments.

Signed-off-by: Ben Cahill <ben.m.cahill@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ben Cahill 2009-10-30 14:36:07 -07:00 committed by John W. Linville
parent 88521364cc
commit a6c5c731c3
3 changed files with 18 additions and 14 deletions
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4
drivers/net/wireless/iwlwifi/iwl-1000.c
View file

@ -164,7 +164,7 @@ struct iwl_cfg iwl1000_bgn_cfg = {
.valid_tx_ant = ANT_A,
.valid_rx_ant = ANT_AB,
.pll_cfg_val = CSR50_ANA_PLL_CFG_VAL,
.set_l0s = false,
.set_l0s = true,
.use_bsm = false,
.max_ll_items = OTP_MAX_LL_ITEMS_1000,
.shadow_ram_support = false,
@ -190,7 +190,7 @@ struct iwl_cfg iwl1000_bg_cfg = {
.valid_tx_ant = ANT_A,
.valid_rx_ant = ANT_AB,
.pll_cfg_val = CSR50_ANA_PLL_CFG_VAL,
.set_l0s = false,
.set_l0s = true,
.use_bsm = false,
.max_ll_items = OTP_MAX_LL_ITEMS_1000,
.shadow_ram_support = false,

20
drivers/net/wireless/iwlwifi/iwl-6000.c
View file

@ -299,7 +299,7 @@ struct iwl_cfg iwl6000h_2agn_cfg = {
.valid_tx_ant = ANT_AB,
.valid_rx_ant = ANT_AB,
.pll_cfg_val = 0,
.set_l0s = false,
.set_l0s = true,
.use_bsm = false,
.pa_type = IWL_PA_HYBRID,
.max_ll_items = OTP_MAX_LL_ITEMS_6x00,
@ -329,7 +329,7 @@ struct iwl_cfg iwl6000h_2abg_cfg = {
.valid_tx_ant = ANT_AB,
.valid_rx_ant = ANT_AB,
.pll_cfg_val = 0,
.set_l0s = false,
.set_l0s = true,
.use_bsm = false,
.pa_type = IWL_PA_HYBRID,
.max_ll_items = OTP_MAX_LL_ITEMS_6x00,
@ -358,7 +358,7 @@ struct iwl_cfg iwl6000h_2bg_cfg = {
.valid_tx_ant = ANT_AB,
.valid_rx_ant = ANT_AB,
.pll_cfg_val = 0,
.set_l0s = false,
.set_l0s = true,
.use_bsm = false,
.pa_type = IWL_PA_HYBRID,
.max_ll_items = OTP_MAX_LL_ITEMS_6x00,
@ -390,7 +390,7 @@ struct iwl_cfg iwl6000i_2agn_cfg = {
.valid_tx_ant = ANT_BC,
.valid_rx_ant = ANT_BC,
.pll_cfg_val = 0,
.set_l0s = false,
.set_l0s = true,
.use_bsm = false,
.pa_type = IWL_PA_INTERNAL,
.max_ll_items = OTP_MAX_LL_ITEMS_6x00,
@ -420,7 +420,7 @@ struct iwl_cfg iwl6000i_2abg_cfg = {
.valid_tx_ant = ANT_BC,
.valid_rx_ant = ANT_BC,
.pll_cfg_val = 0,
.set_l0s = false,
.set_l0s = true,
.use_bsm = false,
.pa_type = IWL_PA_INTERNAL,
.max_ll_items = OTP_MAX_LL_ITEMS_6x00,
@ -449,7 +449,7 @@ struct iwl_cfg iwl6000i_2bg_cfg = {
.valid_tx_ant = ANT_BC,
.valid_rx_ant = ANT_BC,
.pll_cfg_val = 0,
.set_l0s = false,
.set_l0s = true,
.use_bsm = false,
.pa_type = IWL_PA_INTERNAL,
.max_ll_items = OTP_MAX_LL_ITEMS_6x00,
@ -478,7 +478,7 @@ struct iwl_cfg iwl6050_2agn_cfg = {
.valid_tx_ant = ANT_AB,
.valid_rx_ant = ANT_AB,
.pll_cfg_val = 0,
.set_l0s = false,
.set_l0s = true,
.use_bsm = false,
.pa_type = IWL_PA_SYSTEM,
.max_ll_items = OTP_MAX_LL_ITEMS_6x50,
@ -508,7 +508,7 @@ struct iwl_cfg iwl6050_2abg_cfg = {
.valid_tx_ant = ANT_AB,
.valid_rx_ant = ANT_AB,
.pll_cfg_val = 0,
.set_l0s = false,
.set_l0s = true,
.use_bsm = false,
.pa_type = IWL_PA_SYSTEM,
.max_ll_items = OTP_MAX_LL_ITEMS_6x50,
@ -537,7 +537,7 @@ struct iwl_cfg iwl6000_3agn_cfg = {
.valid_tx_ant = ANT_ABC,
.valid_rx_ant = ANT_ABC,
.pll_cfg_val = 0,
.set_l0s = false,
.set_l0s = true,
.use_bsm = false,
.pa_type = IWL_PA_SYSTEM,
.max_ll_items = OTP_MAX_LL_ITEMS_6x00,
@ -567,7 +567,7 @@ struct iwl_cfg iwl6050_3agn_cfg = {
.valid_tx_ant = ANT_ABC,
.valid_rx_ant = ANT_ABC,
.pll_cfg_val = 0,
.set_l0s = false,
.set_l0s = true,
.use_bsm = false,
.pa_type = IWL_PA_SYSTEM,
.max_ll_items = OTP_MAX_LL_ITEMS_6x50,

8
drivers/net/wireless/iwlwifi/iwl-core.c
View file

@ -1430,8 +1430,12 @@ int iwl_apm_init(struct iwl_priv *priv)
CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A);
/*
* HW bug W/A - costs negligible power consumption ...
* Check if BIOS (or OS) enabled L1-ASPM on this device
* HW bug W/A for instability in PCIe bus L0->L0S->L1 transition.
* Check if BIOS (or OS) enabled L1-ASPM on this device.
* If so (likely), disable L0S, so device moves directly L0->L1;
* costs negligible amount of power savings.
* If not (unlikely), enable L0S, so there is at least some
* power savings, even without L1.
*/
if (priv->cfg->set_l0s) {
lctl = iwl_pcie_link_ctl(priv);