On 7/24/2020 9:28 AM, satya priya wrote:
As a part of system suspend we call uart_port_suspend from the
Serial driver, which calls set_mctrl passing mctrl as NULL. This
makes RFR high(NOT_READY) during suspend.
Due to this BT SoC is not able to send wakeup bytes to UART during
suspend. Included if check for non-suspend case to keep RFR low
during suspend.
Reviewed-by: Akash Asthana <akashast@xxxxxxxxxxxxxx>
Signed-off-by: satya priya <skakit@xxxxxxxxxxxxxx>
---
Changes in V2:
- This patch fixes the UART flow control issue during suspend.
Newly added in V2.
drivers/tty/serial/qcom_geni_serial.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 07b7b6b..7108dfc 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -242,7 +242,7 @@ static void qcom_geni_serial_set_mctrl(struct uart_port *uport,
if (mctrl & TIOCM_LOOP)
port->loopback = RX_TX_CTS_RTS_SORTED;
- if (!(mctrl & TIOCM_RTS))
+ if ((!(mctrl & TIOCM_RTS)) && (!(uport->suspended)))
uart_manual_rfr = UART_MANUAL_RFR_EN | UART_RFR_NOT_READY;
writel(uart_manual_rfr, uport->membase + SE_UART_MANUAL_RFR);
}
--
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