diff options
| author | Mohammed Shafi Shajakhan <mshajakhan@atheros.com> | 2010-11-23 18:12:27 +0300 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-11-30 21:49:13 +0300 |
| commit | ea066d5a91f2610116dcd27054f749e4f07799d8 (patch) | |
| tree | 451eb5ad15da0cf8c401dded725fe0f3838beb48 /drivers/net/wireless/ath/ath9k/hw.c | |
| parent | dd318575ff0aae91ac4cbcc5b60c184e59267212 (diff) | |
| download | linux-ea066d5a91f2610116dcd27054f749e4f07799d8.tar.xz | |
ath9k: Add support for Adaptive Power Management
This feature is to mitigate the problem of certain 3
stream chips that exceed the PCIe power requirements.An EEPROM flag
controls which chips have APM enabled which is basically read from
miscellaneous configuration element of the EEPROM header.
This workaround will reduce power consumption by using 2 Tx chains for
Single and Double stream rates (5 GHz only).All self generated frames
(regardless of rate) are sent on 2 chains when this feature is
enabled(Chip Limitation).
Cc: Paul Shaw <paul.shaw@atheros.com>
Signed-off-by: Mohammed Shafi Shajakhan <mshajakhan@atheros.com>
Tested-by: Mohammed Shafi Shajakhan <mshajakhan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/ath/ath9k/hw.c')
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/hw.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c index 883f6cc7b82c..b4396a9578e5 100644 --- a/drivers/net/wireless/ath/ath9k/hw.c +++ b/drivers/net/wireless/ath/ath9k/hw.c @@ -1974,6 +1974,12 @@ int ath9k_hw_fill_cap_info(struct ath_hw *ah) if ((ant_div_ctl1 & 0x1) && ((ant_div_ctl1 >> 3) & 0x1)) pCap->hw_caps |= ATH9K_HW_CAP_ANT_DIV_COMB; } + if (AR_SREV_9300_20_OR_LATER(ah)) { + if (ah->eep_ops->get_eeprom(ah, EEP_CHAIN_MASK_REDUCE)) + pCap->hw_caps |= ATH9K_HW_CAP_APM; + } + + return 0; } |