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iwlagn: Enable PCI L1 ACTIVE state after uCode has been loaded 

PCI L1 Active needs to be disabled while loading the uCode so that the bus
doesn't go to sleep. The enablement of L1 Active should be done after
the uCode has sent the ALIVE response. The enablement of L1 Active was
missing.
Enabling L1 Active allows to save power if the BIOS / bus driver allows
it.

I measured the power consumption while not associated and
idle/associated:
L1 Active disabled: 39 mA = 130mW
L1 Active enabled:   6 mA = 20 mW

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
This commit is contained in:
Grumbach, Emmanuel 2010-11-18 03:47:38 -08:00 committed by Wey-Yi Guy
parent 40b97c2fe9
commit e7cad69cda
1 changed files with 4 additions and 0 deletions
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4
drivers/net/wireless/iwlwifi/iwl-agn-ucode.c
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@ -531,6 +531,10 @@ int iwlagn_alive_notify(struct iwl_priv *priv)
spin_unlock_irqrestore(&priv->lock, flags);
/* Enable L1-Active */
iwl_clear_bits_prph(priv, APMG_PCIDEV_STT_REG,
APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
iwlagn_send_wimax_coex(priv);
iwlagn_set_Xtal_calib(priv);