linux-kernel - [PATCH] serial: qcom_geni_serial: Setup serial port after Deep sleep

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Date:   Tue, 30 May 2023 16:45:57 +0530
From:   Mehul Raninga <quic_mraninga@...cinc.com>
To:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        gregkh@...uxfoundation.org, jirislaby@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     quic_vdadhani@...cinc.com, quic_vtanuku@...cinc.com,
        quic_vnivarth@...cinc.com,
        Mehul Raninga <quic_mraninga@...cinc.com>
Subject: [PATCH] serial: qcom_geni_serial: Setup serial port after Deep sleep

While exiting deep sleep, serial port loses its configuration
hence it prints garbage characters on console.

Set serial port configuration while resume from deep sleep.

Signed-off-by: Mehul Raninga <quic_mraninga@...cinc.com>
---
 drivers/tty/serial/qcom_geni_serial.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 8582479f0211..c04b8fec30ba 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -20,6 +20,7 @@
 #include <linux/serial.h>
 #include <linux/serial_core.h>
 #include <linux/slab.h>
+#include <linux/suspend.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
 #include <dt-bindings/interconnect/qcom,icc.h>
@@ -1737,6 +1738,8 @@ static int qcom_geni_serial_sys_resume(struct device *dev)
 	if (uart_console(uport)) {
 		geni_icc_set_tag(&port->se, QCOM_ICC_TAG_ALWAYS);
 		geni_icc_set_bw(&port->se);
+		if (pm_suspend_via_firmware())
+			qcom_geni_serial_port_setup(uport);
 	}
 	return ret;
 }
-- 
2.17.1