ARM: dts: msm: configure pc disable latency for 8976

Configure PC disable latency value for 8976 target when  pm_qos
request to disable power collapse for DDR during SSR and coldboot.

CRs-Fixed: 914674
Change-Id: I65a2ca8b4a94a337195e8c4e8e4743e38f57197e
Signed-off-by: Anand N Sunkad <asunka@codeaurora.org>

Documentation/devicetree/bindings/wcnss/wcnss-wlan.txt

@@ -59,6 +59,8 @@ support for pronto hardware.
 will be turned on/off when WLAN is enabled/disabled respectively.
 - qcom,has-vsys-adc-channel: boolean flag to determine which ADC HW channel need
 to use for VBATT feature.
+- qcom,pc-disable-latency: is a configurable value to configure
+pc disable latency value.
 
 Example:
 

arch/arm/boot/dts/qcom/msm8976.dtsi

@@ -1761,6 +1761,7 @@
 
 		clock-names = "xo", "rf_clk", "measure", "wcnss_debug";
 
+		qcom,pc-disable-latency = <80>;
 		qcom,has-autodetect-xo;
 		qcom,is-pronto-v3;
 		qcom,has-pronto-hw;

drivers/net/wireless/wcnss/wcnss_wlan.c

@@ -1219,7 +1219,8 @@ void wcnss_disable_pc_add_req(void)
 	if (!penv->pc_disabled) {
 		wcnss_pm_qos_add_request();
 		wcnss_prevent_suspend();
-		wcnss_pm_qos_update_request(WCNSS_DISABLE_PC_LATENCY);
+		wcnss_pm_qos_update_request(penv->wlan_config.
+					    pc_disable_latency);
 		penv->pc_disabled = 1;
 	}
 	mutex_unlock(&penv->pm_qos_mutex);
@@ -2810,6 +2811,12 @@ wcnss_trigger_config(struct platform_device *pdev)
 		goto fail;
 	}
 
+	if (of_property_read_u32(pdev->dev.of_node,
+				 "qcom,pc-disable-latency",
+				 &penv->wlan_config.pc_disable_latency)) {
+		penv->wlan_config.pc_disable_latency = WCNSS_DISABLE_PC_LATENCY;
+	}
+
 	/* make sure we are only triggered once */
 	if (penv->triggered)
 		return 0;

include/linux/wcnss_wlan.h

@@ -43,6 +43,7 @@ struct wcnss_wlan_config {
 	void __iomem	*msm_wcnss_base;
 	int	iris_id;
 	int	vbatt;
+	int	pc_disable_latency;
 	struct vregs_level pronto_vlevel[PRONTO_REGULATORS];
 	struct vregs_level iris_vlevel[IRIS_REGULATORS];
 };