linux-kernel - [PATCH v2 5/7] serial: qcom-geni: Just set the watermark level once

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Message-ID: <20240530154553.v2.5.Ie02dcdf46089457026de3bd665c08f0210711966@changeid>
Date: Thu, 30 May 2024 15:45:57 -0700
From: Douglas Anderson <dianders@...omium.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>
Cc: linux-arm-msm@...r.kernel.org,
	John Ogness <john.ogness@...utronix.de>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Tony Lindgren <tony@...mide.com>,
	Stephen Boyd <swboyd@...omium.org>,
	linux-serial@...r.kernel.org,
	Yicong Yang <yangyicong@...ilicon.com>,
	Johan Hovold <johan+linaro@...nel.org>,
	linux-kernel@...r.kernel.org,
	Bjorn Andersson <andersson@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Douglas Anderson <dianders@...omium.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH v2 5/7] serial: qcom-geni: Just set the watermark level once

There's no reason to set the TX watermark level to 0 when we disable
TX since we're disabling the interrupt anyway. Just set the watermark
level once at init time and leave it alone.

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

Changes in v2:
- New

 drivers/tty/serial/qcom_geni_serial.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 539a6ac85511..d7814f9e5c26 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -418,7 +418,6 @@ static int qcom_geni_serial_get_char(struct uart_port *uport)
 static void qcom_geni_serial_poll_put_char(struct uart_port *uport,
 							unsigned char c)
 {
-	writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG);
 	qcom_geni_serial_setup_tx(uport, 1);
 	WARN_ON(!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
 						M_TX_FIFO_WATERMARK_EN, true));
@@ -462,7 +461,6 @@ __qcom_geni_serial_console_write(struct uart_port *uport, const char *s,
 			bytes_to_send++;
 	}
 
-	writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG);
 	qcom_geni_serial_setup_tx(uport, bytes_to_send);
 	for (i = 0; i < count; ) {
 		size_t chars_to_write = 0;
@@ -690,7 +688,6 @@ static void qcom_geni_serial_start_tx_fifo(struct uart_port *uport)
 	irq_en = readl(uport->membase +	SE_GENI_M_IRQ_EN);
 	irq_en |= M_TX_FIFO_WATERMARK_EN | M_CMD_DONE_EN;
 
-	writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG);
 	writel(irq_en, uport->membase +	SE_GENI_M_IRQ_EN);
 }
 
@@ -701,7 +698,6 @@ static void qcom_geni_serial_stop_tx_fifo(struct uart_port *uport)
 
 	irq_en = readl(uport->membase + SE_GENI_M_IRQ_EN);
 	irq_en &= ~(M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN);
-	writel(0, uport->membase + SE_GENI_TX_WATERMARK_REG);
 	writel(irq_en, uport->membase + SE_GENI_M_IRQ_EN);
 	/* Possible stop tx is called multiple times. */
 	if (!qcom_geni_serial_main_active(uport))
@@ -1153,6 +1149,7 @@ static int qcom_geni_serial_port_setup(struct uart_port *uport)
 			       false, true, true);
 	geni_se_init(&port->se, UART_RX_WM, port->rx_fifo_depth - 2);
 	geni_se_select_mode(&port->se, port->dev_data->mode);
+	writel(DEF_TX_WM, uport->membase + SE_GENI_TX_WATERMARK_REG);
 	qcom_geni_serial_start_rx(uport);
 	port->setup = true;
 
-- 
2.45.1.288.g0e0cd299f1-goog