Bluetooth: btmtksdio: Add pmctrl handling for BT closed state during reset

This patch adds logic to handle power management control when the
Bluetooth function is closed during the SDIO reset sequence.

Specifically, if BT is closed before reset, the driver enables the
SDIO function and sets driver pmctrl. After reset, if BT remains
closed, the driver sets firmware pmctrl and disables the SDIO function.

These changes ensure proper power management and device state consistency
across the reset flow.

Fixes: 8fafe70 ("Bluetooth: mt7921s: support bluetooth reset mechanism")
Signed-off-by: Chris Lu <chris.lu@mediatek.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

Author: ChrisCH-Lu

drivers/bluetooth/btmtksdio.c

@@ -1270,6 +1270,12 @@ static void btmtksdio_reset(struct hci_dev *hdev)
 
 	sdio_claim_host(bdev->func);
 
+	/* set drv_pmctrl if BT is closed before doing reset */
+	if (!test_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state)) {
+		sdio_enable_func(bdev->func);
+		btmtksdio_drv_pmctrl(bdev);
+	}
+
 	sdio_writel(bdev->func, C_INT_EN_CLR, MTK_REG_CHLPCR, NULL);
 	skb_queue_purge(&bdev->txq);
 	cancel_work_sync(&bdev->txrx_work);
@@ -1285,6 +1291,12 @@ static void btmtksdio_reset(struct hci_dev *hdev)
 		goto err;
 	}
 
+	/* set fw_pmctrl back if BT is closed after doing reset */
+	if (!test_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state)) {
+		btmtksdio_fw_pmctrl(bdev);
+		sdio_disable_func(bdev->func);
+	}
+
 	clear_bit(BTMTKSDIO_PATCH_ENABLED, &bdev->tx_state);
 err:
 	sdio_release_host(bdev->func);