[PATCH v4 12/13] wifi: ath12k: Power down userPD

[Raj Kumar Bhagat <quic_rajkbhag@xxxxxxxxxxx>]

From: Sowmiya Sree Elavalagan <quic_ssreeela@xxxxxxxxxxx>

Set the stop bit in SMEM to power down the userPD. Wait for stop-ack IRQ
to indicate power down completion. Release the userPD firmware using its
peripheral ID.

Tested-on: IPQ5332 hw1.0 AHB WLAN.WBE.1.3.1-00130-QCAHKSWPL_SILICONZ-1

Signed-off-by: Sowmiya Sree Elavalagan <quic_ssreeela@xxxxxxxxxxx>
Signed-off-by: Raj Kumar Bhagat <quic_rajkbhag@xxxxxxxxxxx>
---
 drivers/net/wireless/ath/ath12k/ahb.c | 30 +++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/net/wireless/ath/ath12k/ahb.c b/drivers/net/wireless/ath/ath12k/ahb.c
index 74d10af6591f..1015b422e263 100644
--- a/drivers/net/wireless/ath/ath12k/ahb.c
+++ b/drivers/net/wireless/ath/ath12k/ahb.c
@@ -477,6 +477,34 @@ static int ath12k_ahb_power_up(struct ath12k_base *ab)
 	return ret;
 }
 
+static void ath12k_ahb_power_down(struct ath12k_base *ab, bool is_suspend)
+{
+	struct ath12k_ahb *ab_ahb = ath12k_ab_to_ahb(ab);
+	unsigned long time_left;
+	u32 pasid;
+	int ret;
+
+	qcom_smem_state_update_bits(ab_ahb->stop_state, BIT(ab_ahb->stop_bit),
+				    BIT(ab_ahb->stop_bit));
+
+	time_left = wait_for_completion_timeout(&ab_ahb->userpd_stopped,
+						ATH12K_USERPD_STOP_TIMEOUT);
+	if (!time_left) {
+		ath12k_err(ab, "UserPD stop wait timed out\n");
+		return;
+	}
+
+	qcom_smem_state_update_bits(ab_ahb->stop_state, BIT(ab_ahb->stop_bit), 0);
+
+	pasid = (u32_encode_bits(ab_ahb->userpd_id, ATH12K_USERPD_ID_MASK)) |
+		ATH12K_AHB_UPD_SWID;
+	/* Release the firmware */
+	ret = qcom_scm_pas_shutdown(pasid);
+	if (ret)
+		ath12k_err(ab, "scm pas shutdown failed for userPD%d\n",
+			   ab_ahb->userpd_id);
+}
+
 static void ath12k_ahb_init_qmi_ce_config(struct ath12k_base *ab)
 {
 	struct ath12k_qmi_ce_cfg *cfg = &ab->qmi.ce_cfg;
@@ -695,6 +723,7 @@ static const struct ath12k_hif_ops ath12k_ahb_hif_ops_ipq5332 = {
 	.irq_disable = ath12k_ahb_ext_irq_disable,
 	.map_service_to_pipe = ath12k_ahb_map_service_to_pipe,
 	.power_up = ath12k_ahb_power_up,
+	.power_down = ath12k_ahb_power_down,
 };
 
 static irqreturn_t ath12k_userpd_irq_handler(int irq, void *data)
@@ -1173,6 +1202,7 @@ static void ath12k_ahb_remove(struct platform_device *pdev)
 	struct ath12k_base *ab = platform_get_drvdata(pdev);
 
 	if (test_bit(ATH12K_FLAG_QMI_FAIL, &ab->dev_flags)) {
+		ath12k_ahb_power_down(ab, false);
 		ath12k_qmi_deinit_service(ab);
 		goto qmi_fail;
 	}
-- 
2.34.1