From: Huang Shijie <shijie8@gmail.com>
To: gregkh@linuxfoundation.org
Cc: alan@linux.intel.com, linux-serial@vger.kernel.org,
linux-kernel@vger.kernel.org, shawn.guo@linaro.org,
linux-arm-kernel@lists.infradead.org,
Huang Shijie <shijie8@gmail.com>
Subject: [PATCH 1/2] serial: mxs-auart: fix the wrong setting order
Date: Thu, 6 Sep 2012 22:38:40 -0400 [thread overview]
Message-ID: <1346985521-2248-1-git-send-email-shijie8@gmail.com> (raw)
After set the AUART_CTRL0_CLKGATE, the UART will gate all the clocks off.
So the following line will not take effect.
................................................................
writel(AUART_INTR_RXIEN | AUART_INTR_RTIEN | AUART_INTR_CTSMIEN,
u->membase + AUART_INTR_CLR);
................................................................
To fix this issue, the patch moves this gate-off line to
the end of setting registers.
Signed-off-by: Huang Shijie <shijie8@gmail.com>
---
drivers/tty/serial/mxs-auart.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index dafeef2..ea5f888 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -457,11 +457,11 @@ static void mxs_auart_shutdown(struct uart_port *u)
writel(AUART_CTRL2_UARTEN, u->membase + AUART_CTRL2_CLR);
- writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_SET);
-
writel(AUART_INTR_RXIEN | AUART_INTR_RTIEN | AUART_INTR_CTSMIEN,
u->membase + AUART_INTR_CLR);
+ writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_SET);
+
clk_disable_unprepare(s->clk);
}
--
1.7.4.4
next reply other threads:[~2012-09-06 14:36 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-07 2:38 Huang Shijie [this message]
2012-09-07 2:38 ` [PATCH 2/2] serial: mxs-auart: put the device in mxs_auart_probe() Huang Shijie
2012-09-07 2:43 ` Shawn Guo
2012-09-07 2:33 ` [PATCH] serial: mxs-auart: put the device when exit or error Huang Shijie
2012-09-07 3:14 ` Shawn Guo
2012-09-10 23:00 ` Greg KH
2012-09-07 2:48 ` [PATCH 2/2] serial: mxs-auart: put the device in mxs_auart_probe() Huang Shijie
2012-09-07 2:38 ` [PATCH 1/2] serial: mxs-auart: fix the wrong setting order Shawn Guo
2012-09-07 2:43 ` Huang Shijie
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