3 files changed, 22 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/pm24xx.c b/arch/arm/mach-omap2/pm24xx.c
index a40457d81927..c85923e56b85 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 75c0cd13ad8e..0ec8a04b7473 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 bc934dbe3bf0..d17960a1be25 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>
@@ -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);