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From:   Mehul Raninga <quic_mraninga@quicinc.com>
To:     agross@kernel.org, andersson@kernel.org, konrad.dybcio@linaro.org,
        gregkh@linuxfoundation.org, jirislaby@kernel.org,
        linux-arm-msm@vger.kernel.org, linux-serial@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     quic_vdadhani@quicinc.com, quic_vtanuku@quicinc.com,
        quic_vnivarth@quicinc.com,
        Mehul Raninga <quic_mraninga@quicinc.com>
Subject: [PATCH] serial: qcom_geni_serial: Setup serial port after Deep sleep
Date:   Tue, 30 May 2023 16:45:57 +0530
Message-Id: <20230530111557.10944-1-quic_mraninga@quicinc.com>
Precedence: bulk

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@quicinc.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