ARM: OMAP2+: UART: Avoid uart idling on suspend for no_console_suspend usecase

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>
Signed-off-by: Kevin Hilman <khilman@ti.com>

diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 85516c9..6c8135a 100644 (file)
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -64,6 +64,7 @@ struct omap_uart_state {
 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 */
@@ -298,6 +299,10 @@ 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
@@ -385,7 +390,9 @@ void __init omap_serial_init_port(struct omap_board_data *bdata,
        WARN(IS_ERR(pdev), "Could not build omap_device for %s: %s.\n",
             name, oh->name);
 
-       omap_device_disable_idle_on_suspend(pdev);
+       if ((console_uart_id == bdata->id) && no_console_suspend)
+               omap_device_disable_idle_on_suspend(pdev);
+
        oh->mux = omap_hwmod_mux_init(bdata->pads, bdata->pads_cnt);
 
        uart->pdev = pdev;