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qcacld-3.0: Move BW voting to bus suspend/resume

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Current during system suspend/resume, we remove/add votes for DDR/SNOC
during cfg80211 suspend/resume functions. However, check for pending TX
completions and RX softirq processing happens in the bus suspend
functions which get called after cfg80211 suspend/resume functions.

Hence, there is a small time window where there may be DDR transactions
from WLAN SOC with no vote for DDR/SNOC. This can lead to high bus
latency as seen by WLAN SOC. To avoid this, move the bus voting for
system suspend/resume operation in the bus suspend/resume functions.

Change-Id: I9242d438c1fa07cd7a2dec6994f437d07dd9bb68
CRs-Fixed: 2673101
This commit is contained in:
Mohit Khanna 2020-05-11 14:51:17 -07:00 • committed by nshrivas
commit c8fb78d82d
2 changed files with 12 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

12
core/hdd/src/wlan_hdd_driver_ops.c
View file

@ -1072,6 +1072,12 @@ static int __wlan_hdd_bus_suspend(struct wow_enable_params wow_params)
goto resume_pmo;
}
/*
* Remove bus votes at the very end, after making sure there are no
* pending bus transactions from WLAN SOC for TX/RX.
*/
pld_request_bus_bandwidth(hdd_ctx->parent_dev, PLD_BUS_WIDTH_NONE);
hdd_info("bus suspend succeeded");
return 0;
@ -1218,6 +1224,12 @@ int wlan_hdd_bus_resume(void)
return -EINVAL;
}
/*
* Add bus votes at the beginning, before making sure there are any
* bus transactions from WLAN SOC for TX/RX.
*/
pld_request_bus_bandwidth(hdd_ctx->parent_dev, PLD_BUS_WIDTH_MEDIUM);
status = hif_bus_resume(hif_ctx);
if (status) {
hdd_err("Failed hif bus resume");

4
core/hdd/src/wlan_hdd_power.c
View file

@ -1717,8 +1717,6 @@ static int __wlan_hdd_cfg80211_resume_wlan(struct wiphy *wiphy)
goto exit_with_code;
}
pld_request_bus_bandwidth(hdd_ctx->parent_dev, PLD_BUS_WIDTH_MEDIUM);
status = hdd_resume_wlan();
if (status != QDF_STATUS_SUCCESS) {
exit_code = 0;
@ -1973,8 +1971,6 @@ static int __wlan_hdd_cfg80211_suspend_wlan(struct wiphy *wiphy,
hdd_ctx->is_wiphy_suspended = true;
pld_request_bus_bandwidth(hdd_ctx->parent_dev, PLD_BUS_WIDTH_NONE);
hdd_exit();
return 0;