Added changes to support the hibernation feature for serial UART.
Added support for freeze, restore and thaw callbacks to put the
device into hibernation.
Signed-off-by: Aniket Randive <quic_arandive@xxxxxxxxxxx>
---
drivers/tty/serial/qcom_geni_serial.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 83b66b7..b487823 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -924,6 +924,7 @@ static int qcom_geni_serial_port_setup(struct uart_port *uport)
false, true, true);
geni_se_init(&port->se, UART_RX_WM, port->rx_fifo_depth - 2);
geni_se_select_mode(&port->se, GENI_SE_FIFO);
+ qcom_geni_serial_start_rx(uport);
port->setup = true;
return 0;
@@ -1547,9 +1548,43 @@ static int __maybe_unused qcom_geni_serial_sys_resume(struct device *dev)
return ret;
}
+static int qcom_geni_serial_sys_hib_resume(struct device *dev)
+{
+ int ret = 0;
+ struct uart_port *uport;
+ struct qcom_geni_private_data *private_data;
+ struct qcom_geni_serial_port *port = dev_get_drvdata(dev);
+
+ uport = &port->uport;
+ private_data = uport->private_data;
+
+ if (uart_console(uport)) {
+ geni_icc_set_tag(&port->se, 0x7);
+ geni_icc_set_bw(&port->se);
+ ret = uart_resume_port(private_data->drv, uport);
+ /*
+ * For hibernation usecase clients for
+ * console UART won't call port setup during restore,
+ * hence call port setup for console uart.
+ */
+ qcom_geni_serial_port_setup(uport);
+ } else {
+ /*
+ * Peripheral register settings are lost during hibernation.
+ * Update setup flag such that port setup happens again
+ * during next session. Clients of HS-UART will close and
+ * open the port during hibernation.
+ */
+ port->setup = false;
+ }
+ return ret;
+}
+
static const struct dev_pm_ops qcom_geni_serial_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(qcom_geni_serial_sys_suspend,
qcom_geni_serial_sys_resume)
+ .restore = qcom_geni_serial_sys_hib_resume,
+ .thaw = qcom_geni_serial_sys_hib_resume,
};
static const struct of_device_id qcom_geni_serial_match_table[] = {
--
2.7.4
