iwlwifi: disable powersave for 4965

There's a bug in 4965 powersave that appears to
be related to the way it keeps track of its data
during sleep, but we haven't found it yet. Due to
that, using powersave may spontaneously cause the
device to SYSASSERT when transitioning from sleep
to wake. Therefore, disable powersave for 4965,
until (if ever, unfortunately) we can identify
and fix the problem.

Cf. http://bugzilla.intellinuxwireless.org/show_bug.cgi?id=1982
which was closed, but now has re-appeared with
IDLE mode, which probably means we never really
fixed it.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 11 insertions, 5 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.c b/drivers/net/wireless/iwlwifi/iwl-4965.c
index 6a13bfbc9d9..ca61d3796ce 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.c
+++ b/drivers/net/wireless/iwlwifi/iwl-4965.c
@@ -2346,6 +2346,7 @@ struct iwl_cfg iwl4965_agn_cfg = {
         .mod_params = &iwl4965_mod_params,
         .use_isr_legacy = true,
         .ht_greenfield_support = false,
+        .broken_powersave = true,
 };
 
 /* Module firmware */
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index acfd7b40afb..fd26c0dc9c5 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -1585,9 +1585,12 @@ int iwl_setup_mac(struct iwl_priv *priv)
         hw->flags = IEEE80211_HW_SIGNAL_DBM |
                     IEEE80211_HW_NOISE_DBM |
                     IEEE80211_HW_AMPDU_AGGREGATION |
-                    IEEE80211_HW_SPECTRUM_MGMT |
-                    IEEE80211_HW_SUPPORTS_PS |
-                    IEEE80211_HW_SUPPORTS_DYNAMIC_PS;
+                    IEEE80211_HW_SPECTRUM_MGMT;
+
+        if (!priv->cfg->broken_powersave)
+                hw->flags |= IEEE80211_HW_SUPPORTS_PS |
+                             IEEE80211_HW_SUPPORTS_DYNAMIC_PS;
+
         hw->wiphy->interface_modes =
                 BIT(NL80211_IFTYPE_STATION) |
                 BIT(NL80211_IFTYPE_ADHOC);
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.h b/drivers/net/wireless/iwlwifi/iwl-core.h
index c04d2a27081..7ff9ffb2b70 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.h
+++ b/drivers/net/wireless/iwlwifi/iwl-core.h
@@ -252,6 +252,7 @@ struct iwl_cfg {
         const u16 max_ll_items;
         const bool shadow_ram_support;
         const bool ht_greenfield_support;
+        const bool broken_powersave;
 };
 
 /***************************
diff --git a/drivers/net/wireless/iwlwifi/iwl-power.c b/drivers/net/wireless/iwlwifi/iwl-power.c
index 4ec6a8307cc..60be976afff 100644
--- a/drivers/net/wireless/iwlwifi/iwl-power.c
+++ b/drivers/net/wireless/iwlwifi/iwl-power.c
@@ -292,8 +292,9 @@ int iwl_power_update_mode(struct iwl_priv *priv, bool force)
         else
                 dtimper = 1;
 
-        /* TT power setting overwrites everything */
-        if (tt->state >= IWL_TI_1)
+        if (priv->cfg->broken_powersave)
+                iwl_power_sleep_cam_cmd(priv, &cmd);
+        else if (tt->state >= IWL_TI_1)
                 iwl_static_sleep_cmd(priv, &cmd, tt->tt_power_mode, dtimper);
         else if (!enabled)
                 iwl_power_sleep_cam_cmd(priv, &cmd);