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serial: imx: remove unbalanced clk_prepare

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The current code attempts to prepare clk_per and clk_ipg
before using the device. However, the result is an extra
prepare call on each clock. Here is the output of uart
clocks (only uart enabled and used as console):

$  grep uart /sys/kernel/debug/clk/clk_summary
 uart_serial           1            2    80000000          0 0
       uart           1            2    66000000          0 0

This patch balances the calls of prepares. The result is:

$  grep uart /sys/kernel/debug/clk/clk_summary
 uart_serial           1            1    80000000          0 0
       uart           1            1    66000000          0 0

Cc: Fabio Estevam <festevam@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: linux-serial@vger.kernel.org
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eduardo Valentin 2015-08-11 10:21:20 -07:00 committed by Greg Kroah-Hartman
parent eafb9eea76
commit 9e7b399d65
1 changed files with 6 additions and 14 deletions
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18
drivers/tty/serial/imx.c
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@ -1630,12 +1630,12 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
int locked = 1;
int retval;
retval = clk_enable(sport->clk_per);
retval = clk_prepare_enable(sport->clk_per);
if (retval)
return;
retval = clk_enable(sport->clk_ipg);
retval = clk_prepare_enable(sport->clk_ipg);
if (retval) {
clk_disable(sport->clk_per);
clk_disable_unprepare(sport->clk_per);
return;
}
@ -1674,8 +1674,8 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
if (locked)
spin_unlock_irqrestore(&sport->port.lock, flags);
clk_disable(sport->clk_ipg);
clk_disable(sport->clk_per);
clk_disable_unprepare(sport->clk_ipg);
clk_disable_unprepare(sport->clk_per);
}
/*
@ -1776,14 +1776,6 @@ imx_console_setup(struct console *co, char *options)
retval = uart_set_options(&sport->port, co, baud, parity, bits, flow);
clk_disable(sport->clk_ipg);
if (retval) {
clk_unprepare(sport->clk_ipg);
goto error_console;
}
retval = clk_prepare(sport->clk_per);
if (retval)
clk_disable_unprepare(sport->clk_ipg);
error_console: