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wifi: carl9170: mac80211: document spatial multiplexing power save handler

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Replace the bare TODO comment in the SMPS configuration handler
with documentation explaining why the driver accepts but does not
act on SMPS mode changes.

The AR9170 advertises SM_PS disabled (both chains always active)
in its HT capabilities.  While mac80211 may still send SMPS
configuration requests, implementing static or dynamic SMPS would
require firmware support for per-chain enable/disable that the
AR9170 firmware (v1.9.9) does not provide.

Signed-off-by: Masi Osmani <mas-i@hotmail.de>
Acked-by: Christian Lamparter <chunkeey@gmail.com>
Link: https://patch.msgid.link/AM7PPF5613FA0B6B76223A73FFC756A19A99444A@AM7PPF5613FA0B6.EURP251.PROD.OUTLOOK.COM
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
This commit is contained in:
Masi Osmani 2026-03-12 11:37:58 +01:00 committed by Jeff Johnson
parent d6850f1984
commit a711bf00b8
1 changed files with 7 additions and 1 deletions
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8
drivers/net/wireless/ath/carl9170/main.c
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@ -908,7 +908,13 @@ static int carl9170_op_config(struct ieee80211_hw *hw, int radio_idx, u32 change
}
if (changed & IEEE80211_CONF_CHANGE_SMPS) {
/* TODO */
/*
* We advertise SM_PS disabled (all chains active).
* mac80211 may still request mode changes, which we
* accept but only support OFF (both chains active).
* Static/dynamic SMPS would require firmware support
* for chain control that the AR9170 does not provide.
*/
err = 0;
}