linux-kernel - [PATCH V2 3/3] tty: serial: qcom_geni

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Date:   Fri, 24 Jul 2020 09:28:02 +0530
From:   satya priya <skakit@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        gregkh@...uxfoundation.org
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, akashast@...eaurora.org,
        rojay@...eaurora.org, msavaliy@....qualcomm.com,
        satya priya <skakit@...eaurora.org>
Subject: [PATCH V2 3/3] tty: serial: qcom_geni_serial: Fix the UART wakeup issue

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@...eaurora.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);
 }
-- 
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