linux-kernel - [PATCH] serial: stm32: fix pio transmit timeout

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Message-ID: <1501493505-27933-1-git-send-email-bich.hemon@st.com>
Date:   Mon, 31 Jul 2017 09:31:52 +0000
From:   Bich HEMON <bich.hemon@...com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        "Jiri Slaby" <jslaby@...e.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Bich HEMON <bich.hemon@...com>
Subject: [PATCH] serial: stm32: fix pio transmit timeout

From: Gerald Baeza <gerald.baeza@...com>

100µs was too short for low speed transmission
(9600bps)

Signed-off-by: Gerald Baeza <gerald.baeza@...com>
Signed-off-by: Bich Hemon <bich.hemon@...com>
---
 drivers/tty/serial/stm32-usart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 72c0ec1..b16e7e7 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -203,7 +203,7 @@ static void stm32_transmit_chars_pio(struct uart_port *port)
 	ret = readl_relaxed_poll_timeout_atomic(port->membase + ofs->isr,
 						isr,
 						(isr & USART_SR_TXE),
-						10, 100);
+						10, 100000);
 
 	if (ret)
 		dev_err(port->dev, "tx empty not set\n");
-- 
1.9.1