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iwlwifi: mvm: Fix the keep_alive calculation

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The driver must set the keep alive period regardless of power
management state. The keep alive period must be greater or equal to
both the NIC's maximum sleep period, and the listen interval.
However, we were confusing time units (TU) and msec, so fix that.

Signed-off-by: Avri Altman <avri.altman@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Avri Altman 2014-11-11 07:29:59 +02:00 committed by Emmanuel Grumbach
parent 886ca9f5dd
commit 5387b348b7
1 changed files with 4 additions and 5 deletions
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9
drivers/net/wireless/iwlwifi/mvm/power.c
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@ -329,7 +329,7 @@ static void iwl_mvm_power_build_cmd(struct iwl_mvm *mvm,
struct ieee80211_vif *vif,
struct iwl_mac_power_cmd *cmd)
{
int dtimper, dtimper_msec, bi;
int dtimper, bi;
int keep_alive;
bool radar_detect = false;
struct iwl_mvm_vif *mvmvif __maybe_unused =
@ -346,10 +346,9 @@ static void iwl_mvm_power_build_cmd(struct iwl_mvm *mvm,
* immediately after association. Check that keep alive period
* is at least 3 * DTIM
*/
dtimper_msec = dtimper * bi;
keep_alive = max_t(int, 3 * dtimper_msec,
MSEC_PER_SEC * POWER_KEEP_ALIVE_PERIOD_SEC);
keep_alive = DIV_ROUND_UP(keep_alive, MSEC_PER_SEC);
keep_alive = DIV_ROUND_UP(ieee80211_tu_to_usec(3 * dtimper * bi),
USEC_PER_SEC);
keep_alive = max(keep_alive, POWER_KEEP_ALIVE_PERIOD_SEC);
cmd->keep_alive_seconds = cpu_to_le16(keep_alive);
if (mvm->ps_disabled)