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Date: Thu, 12 Nov 2015 10:58:48 +0100
From: Marcus Folkesson <marcus.folkesson@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jslaby@...e.com>
Cc: linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
Marcus Folkesson <marcus.folkesson@...il.com>
Subject: [PATCH] serial: imx: fix clk_prepare/unprepare usage
clk_prepare/unprapare APIs are not allowed in atomic context, so
move prepare/unprepare to probe/remove and use clk_enable/disable
instead.
Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
---
drivers/tty/serial/imx.c | 45 ++++++++++++++++++++++++++++-----------------
1 file changed, 28 insertions(+), 17 deletions(-)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index fe3d41c..dcb4b6b 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1106,12 +1106,12 @@ static int imx_startup(struct uart_port *port)
int retval, i;
unsigned long flags, temp;
- retval = clk_prepare_enable(sport->clk_per);
+ retval = clk_enable(sport->clk_per);
if (retval)
return retval;
- retval = clk_prepare_enable(sport->clk_ipg);
+ retval = clk_enable(sport->clk_ipg);
if (retval) {
- clk_disable_unprepare(sport->clk_per);
+ clk_disable(sport->clk_per);
return retval;
}
@@ -1223,8 +1223,8 @@ static void imx_shutdown(struct uart_port *port)
writel(temp, sport->port.membase + UCR1);
spin_unlock_irqrestore(&sport->port.lock, flags);
- clk_disable_unprepare(sport->clk_per);
- clk_disable_unprepare(sport->clk_ipg);
+ clk_disable(sport->clk_per);
+ clk_disable(sport->clk_ipg);
}
static void imx_flush_buffer(struct uart_port *port)
@@ -1496,12 +1496,12 @@ static int imx_poll_init(struct uart_port *port)
unsigned long temp;
int retval;
- retval = clk_prepare_enable(sport->clk_ipg);
+ retval = clk_enable(sport->clk_ipg);
if (retval)
return retval;
- retval = clk_prepare_enable(sport->clk_per);
+ retval = clk_enable(sport->clk_per);
if (retval)
- clk_disable_unprepare(sport->clk_ipg);
+ clk_disable(sport->clk_ipg);
imx_setup_ufcr(sport, 0);
@@ -1631,12 +1631,12 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
int locked = 1;
int retval;
- retval = clk_prepare_enable(sport->clk_per);
+ retval = clk_enable(sport->clk_per);
if (retval)
return;
- retval = clk_prepare_enable(sport->clk_ipg);
+ retval = clk_enable(sport->clk_ipg);
if (retval) {
- clk_disable_unprepare(sport->clk_per);
+ clk_disable(sport->clk_per);
return;
}
@@ -1675,8 +1675,8 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
if (locked)
spin_unlock_irqrestore(&sport->port.lock, flags);
- clk_disable_unprepare(sport->clk_ipg);
- clk_disable_unprepare(sport->clk_per);
+ clk_disable(sport->clk_ipg);
+ clk_disable(sport->clk_per);
}
/*
@@ -1764,7 +1764,7 @@ imx_console_setup(struct console *co, char *options)
return -ENODEV;
/* For setting the registers, we only need to enable the ipg clock. */
- retval = clk_prepare_enable(sport->clk_ipg);
+ retval = clk_enable(sport->clk_ipg);
if (retval)
goto error_console;
@@ -1777,7 +1777,7 @@ imx_console_setup(struct console *co, char *options)
retval = uart_set_options(&sport->port, co, baud, parity, bits, flow);
- clk_disable_unprepare(sport->clk_ipg);
+ clk_disable(sport->clk_ipg);
error_console:
return retval;
@@ -1915,18 +1915,27 @@ static int serial_imx_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "failed to get ipg clk: %d\n", ret);
return ret;
}
+ ret = clk_prepare(sport->clk_ipg);
+ if (ret)
+ return ret;
sport->clk_per = devm_clk_get(&pdev->dev, "per");
if (IS_ERR(sport->clk_per)) {
ret = PTR_ERR(sport->clk_per);
dev_err(&pdev->dev, "failed to get per clk: %d\n", ret);
+ clk_unprepare(sport->clk_ipg);
+ return ret;
+ }
+ ret = clk_prepare(sport->clk_per);
+ if (ret) {
+ clk_unprepare(sport->clk_ipg);
return ret;
}
sport->port.uartclk = clk_get_rate(sport->clk_per);
/* For register access, we only need to enable the ipg clock. */
- ret = clk_prepare_enable(sport->clk_ipg);
+ ret = clk_enable(sport->clk_ipg);
if (ret)
return ret;
@@ -1936,7 +1945,7 @@ static int serial_imx_probe(struct platform_device *pdev)
UCR1_TXMPTYEN | UCR1_RTSDEN);
writel_relaxed(reg, sport->port.membase + UCR1);
- clk_disable_unprepare(sport->clk_ipg);
+ clk_disable(sport->clk_ipg);
/*
* Allocate the IRQ(s) i.MX1 has three interrupts whereas later
@@ -1969,6 +1978,8 @@ static int serial_imx_probe(struct platform_device *pdev)
static int serial_imx_remove(struct platform_device *pdev)
{
struct imx_port *sport = platform_get_drvdata(pdev);
+ clk_unprepare(sport->clk_ipg);
+ clk_unprepare(sport->clk_per);
return uart_remove_one_port(&imx_reg, &sport->port);
}
--
1.9.1
--
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