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serial: msm_geni_serial: Do not check for uport->suspended flag for suspend

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During system suspend, uart_suspend_port() marking port->suspended flag
to true before calling stop_rx and pm_ops for unvoting the clocks
for console. After this when stop_rx called we are continuous getting
cancel IRQ and ISR handler is returned with port->suspended check.
This is leading to IRQ storm in console UART usecase.

To avoid this replace uport->suspended check in handle isr with
new flag added during resources_off so that we will handle stop_rx during
system suspend for console case.

Change-Id: I4666b727ff5c5b041280a05f3cdd44bb5f73bc16
Signed-off-by: Paras Sharma <parashar@codeaurora.org>
Signed-off-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>
This commit is contained in:
Paras Sharma 2020-12-16 10:46:09 +05:30 • committed by Chandana Kishori Chiluveru
commit e58b4f7097
1 changed files with 8 additions and 4 deletions
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12
drivers/tty/serial/msm_geni_serial.c
View file

@ -207,6 +207,7 @@ struct msm_geni_serial_port {
struct completion s_cmd_timeout;
spinlock_t rx_lock;
bool pm_auto_suspend_disable;
bool is_clock_off;
};
static const struct uart_ops msm_geni_serial_pops;
@ -2041,7 +2042,7 @@ static void msm_geni_serial_handle_isr(struct uart_port *uport,
bool s_cmd_done = false;
bool m_cmd_done = false;
if (uart_console(uport) && uport->suspended) {
if (uart_console(uport) && msm_port->is_clock_off) {
IPC_LOG_MSG(msm_port->console_log,
"%s. Console in suspend state\n", __func__);
goto exit_geni_serial_isr;
@ -2855,11 +2856,14 @@ static void msm_geni_serial_cons_pm(struct uart_port *uport,
{
struct msm_geni_serial_port *msm_port = GET_DEV_PORT(uport);
if (new_state == UART_PM_STATE_ON && old_state == UART_PM_STATE_OFF)
if (new_state == UART_PM_STATE_ON && old_state == UART_PM_STATE_OFF) {
se_geni_resources_on(&msm_port->serial_rsc);
else if (new_state == UART_PM_STATE_OFF &&
old_state == UART_PM_STATE_ON)
msm_port->is_clock_off = false;
} else if (new_state == UART_PM_STATE_OFF &&
old_state == UART_PM_STATE_ON) {
se_geni_resources_off(&msm_port->serial_rsc);
msm_port->is_clock_off = true;
}
}
static void msm_geni_serial_hs_pm(struct uart_port *uport,