ARM: OMAP: serial: Fix the ocp smart idlemode handling bug

commit 5ae256dcd91bf308826a4ac19598b27ebb86a536 upstream.

The current serial UART code, while fidling with ocp idlemode bits,
forget about the smart idle wakeup bit even if it is supported by
UART IP block. This will lead to missing the module wakeup on OMAP's
where the smart idle wakeup is supported.

This was the root cause of the console sluggishness issue, I have been
observing on OMAP4 devices and also can be potential reason for some
other UART wakeup issues.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Kevin Hilman <khilman@ti.com>
Acked-by: Govindraj.R <govindraj.raja@ti.com>
Reviewed-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index f590afc1f673f3afdb3c43cc89f0338ccb2fcc07..4e1d45e98d666ed2fd9c3b0e85d556fde640e044 100644 (file)
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -110,8 +110,14 @@ static void omap_uart_set_noidle(struct platform_device *pdev)
 static void omap_uart_set_smartidle(struct platform_device *pdev)
 {
        struct omap_device *od = to_omap_device(pdev);
+       u8 idlemode;
 
-       omap_hwmod_set_slave_idlemode(od->hwmods[0], HWMOD_IDLEMODE_SMART);
+       if (od->hwmods[0]->class->sysc->idlemodes & SIDLE_SMART_WKUP)
+               idlemode = HWMOD_IDLEMODE_SMART_WKUP;
+       else
+               idlemode = HWMOD_IDLEMODE_SMART;
+
+       omap_hwmod_set_slave_idlemode(od->hwmods[0], idlemode);
 }
 
 #else