[PATCH v8 18/20] OMAP2+: UART: Avoid uart idling on suspend for no_console_suspend usecase

["Govindraj.R" <govindraj.raja@ti.com>]

If no_console_suspend is used we have prevent uart idling during suspend
to provide debug prints.

Power domain hooks can idle uarts if left enabled during system wide suspend
so re-use the omap_device_disable_idle_on_suspend API's to ensure console_uart
is not idled during suspend.

omap_device_disable_idle_on_suspend API was used on all uarts since the uart
driver was not runtime adapted, now with runtime adaptation we can re-use this
API only for no_console_suspend use cases.

Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
---
 arch/arm/mach-omap2/serial.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 631d72a..5d910ef 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -65,6 +65,7 @@ static struct omap_device_pm_latency *default_uart_latency;
 static LIST_HEAD(uart_list);
 static u8 num_uarts;
 static u8 console_uart_id = -1;
+static u8 no_console_suspend;
 
 #define DEFAULT_RXDMA_POLLRATE		1	/* RX DMA polling rate (us) */
 #define DEFAULT_RXDMA_BUFSIZE		4096	/* RX DMA buffer size */
@@ -327,6 +328,10 @@ static int __init omap_serial_early_init(void)
 
 		if (cmdline_find_option(uart_name)) {
 			console_uart_id = uart->num;
+
+			if (cmdline_find_option("no_console_suspend"))
+				no_console_suspend = true;
+
 			/*
 			 * omap-uart can be used for earlyprintk logs
 			 * So if omap-uart is used as console then prevent
@@ -417,9 +422,10 @@ void __init omap_serial_init_port(struct omap_board_data *bdata,
 		od = to_omap_device(pdev);
 		default_uart_latency = od->pm_lats;
 		od->pm_lats = console_uart_latency;
+		if (no_console_suspend)
+			omap_device_disable_idle_on_suspend(pdev);
 	}
 
-	omap_device_disable_idle_on_suspend(pdev);
 	oh->mux = omap_hwmod_mux_init(bdata->pads, bdata->pads_cnt);
 
 	uart->pdev = pdev;
-- 
1.7.4.1