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tty: serial: qcom-geni-serial: Add support for Hibernation feature

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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@quicinc.com>
Link: https://lore.kernel.org/r/1665123780-20557-1-git-send-email-quic_arandive@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aniket Randive 2022-10-07 11:53:00 +05:30 committed by Greg Kroah-Hartman
parent d11cc8c3c4
commit 35781d8356
1 changed files with 35 additions and 0 deletions
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35
drivers/tty/serial/qcom_geni_serial.c
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@ -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[] = {