lkml.org 
[lkml]   [2020]   [Jul]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH V2 3/3] tty: serial: qcom_geni_serial: Fix the UART wakeup issue
Date
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.

Signed-off-by: satya priya <skakit@codeaurora.org>
---
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);
}
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
\
 
 \ /
  Last update: 2020-07-24 05:59    [W:0.283 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site