diff options
| author |   Eduardo Valentin <edubezval@gmail.com> | 2015-08-11 10:21:20 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-08-14 17:23:25 -0700 |
| commit | 9e7b399d6528eac33a6fbfceb2b92af209c3454d (patch) | |
| tree | 0d6a624fd74f7312c44ded789a8523c8e0235e05 /drivers/tty/serial/imx.c | |
| parent | serial: 8250: move rx_running out of the bitfield (diff) | |
| download | linux-dev-9e7b399d6528eac33a6fbfceb2b92af209c3454d.tar.xz linux-dev-9e7b399d6528eac33a6fbfceb2b92af209c3454d.zip | |
serial: imx: remove unbalanced clk_prepare
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>
Diffstat (limited to 'drivers/tty/serial/imx.c')
| -rw-r--r-- | drivers/tty/serial/imx.c | 20 |
1 files changed, 6 insertions, 14 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 9a248eb11308..b27c23256a51 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -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); } /* @@ -1776,15 +1776,7 @@ 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); + clk_disable_unprepare(sport->clk_ipg); error_console: return retval; |