ath11k: pci: disable VDD4BLOW

It's recommended to disable VDD4BLOW during initialisation.

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/1607609124-17250-6-git-send-email-kvalo@codeaurora.org

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

@@ -346,6 +346,15 @@ static void ath11k_pci_clear_all_intrs(struct ath11k_base *ab)
 	ath11k_pci_write32(ab, PCIE_PCIE_INT_ALL_CLEAR, PCIE_INT_CLEAR_ALL);
 }
 
+static void ath11k_pci_set_wlaon_pwr_ctrl(struct ath11k_base *ab)
+{
+	u32 val;
+
+	val = ath11k_pci_read32(ab, WLAON_QFPROM_PWR_CTRL_REG);
+	val &= ~QFPROM_PWR_CTRL_VDD4BLOW_MASK;
+	ath11k_pci_write32(ab, WLAON_QFPROM_PWR_CTRL_REG, val);
+}
+
 static void ath11k_pci_force_wake(struct ath11k_base *ab)
 {
 	ath11k_pci_write32(ab, PCIE_SOC_WAKE_PCIE_LOCAL_REG, 1);
@@ -357,6 +366,7 @@ static void ath11k_pci_sw_reset(struct ath11k_base *ab, bool power_on)
 	if (power_on) {
 		ath11k_pci_enable_ltssm(ab);
 		ath11k_pci_clear_all_intrs(ab);
+		ath11k_pci_set_wlaon_pwr_ctrl(ab);
 		ath11k_pci_fix_l1ss(ab);
 	}
 

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

@@ -45,6 +45,9 @@
 #define PCIE_USB3_PCS_MISC_OSC_DTCT_CONFIG4_VAL	0xff
 #define PCIE_USB3_PCS_MISC_OSC_DTCT_CONFIG_MSK	0x000000ff
 
+#define WLAON_QFPROM_PWR_CTRL_REG		0x01f8031c
+#define QFPROM_PWR_CTRL_VDD4BLOW_MASK		0x4
+
 struct ath11k_msi_user {
 	char *name;
 	int num_vectors;