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authorLinus Torvalds <torvalds@linux-foundation.org>2010-11-29 14:36:07 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-11-29 14:36:07 -0800
commita9735c81a43054a7e8cb8771c8e04c01fcacde10 (patch)
tree53d0fa7f31240a95eb7a77cd555d87ce9c20472e
parentaa3fc52546b847f590d86a093afd863ff9081628 (diff)
parent0d8e2d0dad98a693bad88aea6876ac8b94ad95c6 (diff)
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Merge branch 'omap-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6
* 'omap-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6: OMAP2+: PM/serial: hold console semaphore while OMAP UARTs are disabled OMAP: UART: don't resume UARTs that are not enabled.
-rw-r--r--arch/arm/mach-omap2/pm24xx.c7
-rw-r--r--arch/arm/mach-omap2/pm34xx.c10
-rw-r--r--arch/arm/mach-omap2/serial.c7
3 files changed, 23 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/pm24xx.c b/arch/arm/mach-omap2/pm24xx.c
index a40457d8192..c85923e56b8 100644
--- a/arch/arm/mach-omap2/pm24xx.c
+++ b/arch/arm/mach-omap2/pm24xx.c
@@ -30,6 +30,7 @@
#include <linux/irq.h>
#include <linux/time.h>
#include <linux/gpio.h>
+#include <linux/console.h>
#include <asm/mach/time.h>
#include <asm/mach/irq.h>
@@ -118,6 +119,10 @@ static void omap2_enter_full_retention(void)
if (omap_irq_pending())
goto no_sleep;
+ /* Block console output in case it is on one of the OMAP UARTs */
+ if (try_acquire_console_sem())
+ goto no_sleep;
+
omap_uart_prepare_idle(0);
omap_uart_prepare_idle(1);
omap_uart_prepare_idle(2);
@@ -131,6 +136,8 @@ static void omap2_enter_full_retention(void)
omap_uart_resume_idle(1);
omap_uart_resume_idle(0);
+ release_console_sem();
+
no_sleep:
if (omap2_pm_debug) {
unsigned long long tmp;
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 75c0cd13ad8..0ec8a04b747 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -28,6 +28,7 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/slab.h>
+#include <linux/console.h>
#include <plat/sram.h>
#include <plat/clockdomain.h>
@@ -385,6 +386,12 @@ void omap_sram_idle(void)
omap3_enable_io_chain();
}
+ /* Block console output in case it is on one of the OMAP UARTs */
+ if (per_next_state < PWRDM_POWER_ON ||
+ core_next_state < PWRDM_POWER_ON)
+ if (try_acquire_console_sem())
+ goto console_still_active;
+
/* PER */
if (per_next_state < PWRDM_POWER_ON) {
omap_uart_prepare_idle(2);
@@ -463,6 +470,9 @@ void omap_sram_idle(void)
omap_uart_resume_idle(3);
}
+ release_console_sem();
+
+console_still_active:
/* Disable IO-PAD and IO-CHAIN wakeup */
if (omap3_has_io_wakeup() &&
(per_next_state < PWRDM_POWER_ON ||
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index becf0e38ef7..d17960a1be2 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/serial_8250.h>
#include <linux/pm_runtime.h>
+#include <linux/console.h>
#ifdef CONFIG_SERIAL_OMAP
#include <plat/omap-serial.h>
@@ -406,7 +407,7 @@ void omap_uart_resume_idle(int num)
struct omap_uart_state *uart;
list_for_each_entry(uart, &uart_list, node) {
- if (num == uart->num) {
+ if (num == uart->num && uart->can_sleep) {
omap_uart_enable_clocks(uart);
/* Check for IO pad wakeup */
@@ -807,6 +808,8 @@ void __init omap_serial_init_port(int port)
oh->dev_attr = uart;
+ acquire_console_sem(); /* in case the earlycon is on the UART */
+
/*
* Because of early UART probing, UART did not get idled
* on init. Now that omap_device is ready, ensure full idle
@@ -831,6 +834,8 @@ void __init omap_serial_init_port(int port)
omap_uart_block_sleep(uart);
uart->timeout = DEFAULT_TIMEOUT;
+ release_console_sem();
+
if ((cpu_is_omap34xx() && uart->padconf) ||
(uart->wk_en && uart->wk_mask)) {
device_init_wakeup(&od->pdev.dev, true);