linux-kernel - [PATCH v4 5/8] serial: qcom-geni: Introduce qcom_geni_serial_poll

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Message-ID: <20240610152420.v4.5.Ic6411eab8d9d37acc451705f583fb535cd6dadb2@changeid>
Date: Mon, 10 Jun 2024 15:24:23 -0700
From: Douglas Anderson <dianders@...omium.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>
Cc: Yicong Yang <yangyicong@...ilicon.com>,
	Tony Lindgren <tony@...mide.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Johan Hovold <johan+linaro@...nel.org>,
	John Ogness <john.ogness@...utronix.de>,
	linux-arm-msm@...r.kernel.org,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Stephen Boyd <swboyd@...omium.org>,
	linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Douglas Anderson <dianders@...omium.org>,
	Rob Herring <robh@...nel.org>,
	Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>
Subject: [PATCH v4 5/8] serial: qcom-geni: Introduce qcom_geni_serial_poll_bitfield()

With a small modification the qcom_geni_serial_poll_bit() function
could be used to poll more than just a single bit. Let's generalize
it. We'll make the qcom_geni_serial_poll_bit() into just a wrapper of
the general function.

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---
The new function isn't used yet (except by the wrapper) but will be
used in a future change.

(no changes since v2)

Changes in v2:
- New

 drivers/tty/serial/qcom_geni_serial.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index db933a1549ad..bd03b998ed04 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -264,8 +264,8 @@ static bool qcom_geni_serial_secondary_active(struct uart_port *uport)
 	return readl(uport->membase + SE_GENI_STATUS) & S_GENI_CMD_ACTIVE;
 }
 
-static bool qcom_geni_serial_poll_bit(struct uart_port *uport,
-				      unsigned int offset, u32 field, bool set)
+static bool qcom_geni_serial_poll_bitfield(struct uart_port *uport,
+					   unsigned int offset, u32 field, u32 val)
 {
 	u32 reg;
 	unsigned long timeout_us;
@@ -294,7 +294,7 @@ static bool qcom_geni_serial_poll_bit(struct uart_port *uport,
 	 */
 	while (timeout_us) {
 		reg = readl(uport->membase + offset);
-		if ((bool)(reg & field) == set)
+		if ((reg & field) == val)
 			return true;
 		udelay(10);
 		timeout_us -= 10;
@@ -302,6 +302,12 @@ static bool qcom_geni_serial_poll_bit(struct uart_port *uport,
 	return false;
 }
 
+static bool qcom_geni_serial_poll_bit(struct uart_port *uport,
+				      unsigned int offset, u32 field, bool set)
+{
+	return qcom_geni_serial_poll_bitfield(uport, offset, field, set ? field : 0);
+}
+
 static void qcom_geni_serial_setup_tx(struct uart_port *uport, u32 xmit_size)
 {
 	u32 m_cmd;
-- 
2.45.2.505.gda0bf45e8d-goog