ath11k: hif: implement suspend and resume functions

For suspend support add suspend and resume to HIF layer. These ops are optional
and, for example, AHB bus driver does not need to implement these.

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/1607708150-21066-3-git-send-email-kvalo@codeaurora.org

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

@@ -17,6 +17,8 @@ struct ath11k_hif_ops {
 	void (*stop)(struct ath11k_base *sc);
 	int (*power_up)(struct ath11k_base *sc);
 	void (*power_down)(struct ath11k_base *sc);
+	int (*suspend)(struct ath11k_base *ab);
+	int (*resume)(struct ath11k_base *ab);
 	int (*map_service_to_pipe)(struct ath11k_base *sc, u16 service_id,
 				   u8 *ul_pipe, u8 *dl_pipe);
 	int (*get_user_msi_vector)(struct ath11k_base *ab, char *user_name,
@@ -56,6 +58,22 @@ static inline void ath11k_hif_power_down(struct ath11k_base *sc)
 	sc->hif.ops->power_down(sc);
 }
 
+static inline int ath11k_hif_suspend(struct ath11k_base *ab)
+{
+	if (ab->hif.ops->suspend)
+		return ab->hif.ops->suspend(ab);
+
+	return 0;
+}
+
+static inline int ath11k_hif_resume(struct ath11k_base *ab)
+{
+	if (ab->hif.ops->resume)
+		return ab->hif.ops->resume(ab);
+
+	return 0;
+}
+
 static inline u32 ath11k_hif_read32(struct ath11k_base *sc, u32 address)
 {
 	return sc->hif.ops->read32(sc, address);

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

@@ -913,6 +913,24 @@ static void ath11k_pci_power_down(struct ath11k_base *ab)
 	ath11k_pci_sw_reset(ab_pci->ab, false);
 }
 
+static int ath11k_pci_hif_suspend(struct ath11k_base *ab)
+{
+	struct ath11k_pci *ar_pci = ath11k_pci_priv(ab);
+
+	ath11k_mhi_suspend(ar_pci);
+
+	return 0;
+}
+
+static int ath11k_pci_hif_resume(struct ath11k_base *ab)
+{
+	struct ath11k_pci *ar_pci = ath11k_pci_priv(ab);
+
+	ath11k_mhi_resume(ar_pci);
+
+	return 0;
+}
+
 static void ath11k_pci_kill_tasklets(struct ath11k_base *ab)
 {
 	int i;
@@ -997,6 +1015,8 @@ static const struct ath11k_hif_ops ath11k_pci_hif_ops = {
 	.write32 = ath11k_pci_write32,
 	.power_down = ath11k_pci_power_down,
 	.power_up = ath11k_pci_power_up,
+	.suspend = ath11k_pci_hif_suspend,
+	.resume = ath11k_pci_hif_resume,
 	.irq_enable = ath11k_pci_ext_irq_enable,
 	.irq_disable = ath11k_pci_ext_irq_disable,
 	.get_msi_address =  ath11k_pci_get_msi_address,