OMAP2: PM: check UART status before trying to idle

As is done on OMAP3, check omap_uart_can_sleep() as one of the
pre-conditions for entering the idle loop.  Without this check,
entering idle introduces large latencies on active UARTs, and is
especially noticable on serial console.

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/pm24xx.c b/arch/arm/mach-omap2/pm24xx.c
index 6aeedeacdad8..f5c7ef955942 100644
--- a/arch/arm/mach-omap2/pm24xx.c
+++ b/arch/arm/mach-omap2/pm24xx.c
@@ -245,6 +245,8 @@ static int omap2_can_sleep(void)
 {
         if (omap2_fclks_active())
                 return 0;
+        if (!omap_uart_can_sleep())
+                return 0;
         if (osc_ck->usecount > 1)
                 return 0;
         if (omap_dma_running())