[PATCH] wcn36xx: Fix dynamic power saving

[PATCH] wcn36xx: Fix dynamic power saving

[Loic Poulain]

Since driver does not report hardware dynamic power saving cap,
this is up to the mac80211 to manage power saving timeout and
state machine, using the ieee80211 config callback to report
PS changes. This patch enables/disables PS mode according to
the new configuration.

Remove old behaviour enabling PS mode in a static way, this make
the device unusable when power save is enabled since device is
forced to PS regardless RX/TX traffic.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
---
 drivers/net/wireless/ath/wcn36xx/main.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
index f0b4d43..436b8ea 100644
--- a/drivers/net/wireless/ath/wcn36xx/main.c
+++ b/drivers/net/wireless/ath/wcn36xx/main.c
@@ -384,6 +384,18 @@ static int wcn36xx_config(struct ieee80211_hw *hw, u32 changed)
 		}
 	}
 
+	if (changed & IEEE80211_CONF_CHANGE_PS) {
+		list_for_each_entry(tmp, &wcn->vif_list, list) {
+			vif = wcn36xx_priv_to_vif(tmp);
+			if (hw->conf.flags & IEEE80211_CONF_PS) {
+				if (vif->bss_conf.ps) /* ps allowed ? */
+					wcn36xx_pmc_enter_bmps_state(wcn, vif);
+			} else {
+				wcn36xx_pmc_exit_bmps_state(wcn, vif);
+			}
+		}
+	}
+
 	mutex_unlock(&wcn->conf_mutex);
 
 	return 0;
@@ -747,17 +759,6 @@ static void wcn36xx_bss_info_changed(struct ieee80211_hw *hw,
 		vif_priv->dtim_period = bss_conf->dtim_period;
 	}
 
-	if (changed & BSS_CHANGED_PS) {
-		wcn36xx_dbg(WCN36XX_DBG_MAC,
-			    "mac bss PS set %d\n",
-			    bss_conf->ps);
-		if (bss_conf->ps) {
-			wcn36xx_pmc_enter_bmps_state(wcn, vif);
-		} else {
-			wcn36xx_pmc_exit_bmps_state(wcn, vif);
-		}
-	}
-
 	if (changed & BSS_CHANGED_BSSID) {
 		wcn36xx_dbg(WCN36XX_DBG_MAC, "mac bss changed_bssid %pM\n",
 			    bss_conf->bssid);
-- 
2.7.4

Re: [PATCH] wcn36xx: Fix dynamic power saving

[Bjorn Andersson]

On Fri 08 Dec 08:34 PST 2017, Loic Poulain wrote:

> Since driver does not report hardware dynamic power saving cap,
> this is up to the mac80211 to manage power saving timeout and
> state machine, using the ieee80211 config callback to report
> PS changes. This patch enables/disables PS mode according to
> the new configuration.
> 
> Remove old behaviour enabling PS mode in a static way, this make
> the device unusable when power save is enabled since device is
> forced to PS regardless RX/TX traffic.
> 
> Signed-off-by: Loic Poulain <loic.poulain@linaro.org>

Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>

With below nit.

> ---
>  drivers/net/wireless/ath/wcn36xx/main.c | 23 ++++++++++++-----------
>  1 file changed, 12 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
> index f0b4d43..436b8ea 100644
> --- a/drivers/net/wireless/ath/wcn36xx/main.c
> +++ b/drivers/net/wireless/ath/wcn36xx/main.c
> @@ -384,6 +384,18 @@ static int wcn36xx_config(struct ieee80211_hw *hw, u32 changed)
>  		}
>  	}
>  
> +	if (changed & IEEE80211_CONF_CHANGE_PS) {
> +		list_for_each_entry(tmp, &wcn->vif_list, list) {
> +			vif = wcn36xx_priv_to_vif(tmp);
> +			if (hw->conf.flags & IEEE80211_CONF_PS) {
> +				if (vif->bss_conf.ps) /* ps allowed ? */
> +					wcn36xx_pmc_enter_bmps_state(wcn, vif);
> +			} else {
> +				wcn36xx_pmc_exit_bmps_state(wcn, vif);

During startup I get the error print from wcn36xx_pmc_exit_bmps_state()
that we're not in BMPS state. There's no harm in this, but the error
might concern people.

How about we in addition to this, change the wcn36xx_err() to a
wcn36xx_dbg(PMC...) ?

Regards,
Bjorn

Re: [PATCH] wcn36xx: Fix dynamic power saving

[Loic Poulain]

Hi Bjorn,

On 9 December 2017 at 01:45, Bjorn Andersson <bjorn.andersson@linaro.org> wrote:
>>               }
>>       }
>>
>> +     if (changed & IEEE80211_CONF_CHANGE_PS) {
>> +             list_for_each_entry(tmp, &wcn->vif_list, list) {
>> +                     vif = wcn36xx_priv_to_vif(tmp);
>> +                     if (hw->conf.flags & IEEE80211_CONF_PS) {
>> +                             if (vif->bss_conf.ps) /* ps allowed ? */
>> +                                     wcn36xx_pmc_enter_bmps_state(wcn, vif);
>> +                     } else {
>> +                             wcn36xx_pmc_exit_bmps_state(wcn, vif);
>
> During startup I get the error print from wcn36xx_pmc_exit_bmps_state()
> that we're not in BMPS state. There's no harm in this, but the error
> might concern people.
>
> How about we in addition to this, change the wcn36xx_err() to a
> wcn36xx_dbg(PMC...) ?

Thanks for reporting this, I assume mac80211 disable PS mode before enabling it
on timeout... It makes sense to avoid this error msg since balancing
is well managed
by this driver.

Regards,
Loic