ath11k: enable idle power save mode

Host sends wmi command to allow hardware enter idle power
save mode in ath11k_mac_op_start function.

hw parameter idle_ps indicates whether idle power save is supported.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1
Signed-off-by: Carl Huang <cjhuang@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1601544890-13450-8-git-send-email-kvalo@codeaurora.org

drivers/net/wireless/ath/ath11k/core.c

@@ -64,6 +64,7 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
 					BIT(NL80211_IFTYPE_MESH_POINT),
 		.supports_monitor = true,
 		.supports_shadow_regs = false,
+		.idle_ps = false,
 	},
 	{
 		.hw_rev = ATH11K_HW_IPQ6018_HW10,
@@ -100,6 +101,7 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
 					BIT(NL80211_IFTYPE_MESH_POINT),
 		.supports_monitor = true,
 		.supports_shadow_regs = false,
+		.idle_ps = false,
 	},
 	{
 		.name = "qca6390 hw2.0",
@@ -135,6 +137,7 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
 					BIT(NL80211_IFTYPE_AP),
 		.supports_monitor = false,
 		.supports_shadow_regs = true,
+		.idle_ps = true,
 	},
 };
 

drivers/net/wireless/ath/ath11k/hw.h

@@ -160,6 +160,7 @@ struct ath11k_hw_params {
 	u16 interface_modes;
 	bool supports_monitor;
 	bool supports_shadow_regs;
+	bool idle_ps;
 };
 
 struct ath11k_hw_ops {

drivers/net/wireless/ath/ath11k/mac.c

@@ -4208,6 +4208,15 @@ static int ath11k_mac_op_start(struct ieee80211_hw *hw)
 	rcu_assign_pointer(ab->pdevs_active[ar->pdev_idx],
 			   &ab->pdevs[ar->pdev_idx]);
 
+	/* allow device to enter IMPS */
+	if (ab->hw_params.idle_ps) {
+		ret = ath11k_wmi_pdev_set_param(ar, WMI_PDEV_PARAM_IDLE_PS_CONFIG,
+						1, pdev->pdev_id);
+		if (ret) {
+			ath11k_err(ab, "failed to enable idle ps: %d\n", ret);
+			goto err;
+		}
+	}
 	return 0;
 
 err: