Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-25 05:32:00 +00:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/tty/serial/qcom_geni_serial.c
View File

@ -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[] = {